| Seq | Timestamp | Type | Name | Duration |
|---|---|---|---|---|
| 0/0 | 2026/08/12 10:56 | flow | patch-triage |
4mArgs:null Results: {
"EnableConfigs": [
"KVM"
],
"FocusSymbols": [
"dat_cond_set_storage_key",
"kvm_s390_inject_vcpu",
"kvm_s390_set_irq_state",
"kvm_arch_set_irq_inatomic",
"kvm_s390_pv_deinit_vm",
"kvm_s390_pv_init_vm",
"kvm_s390_pv_set_aside",
"guest_translate_address_with_key"
],
"KMSANReasoning": "The patch fixes an uninitialized memory info-leak in `dat_cond_set_storage_key()`. When `ptep != NULL` and `ptep-\u003eh.i == true`, the local stack variable `prev` (of type `union skey`) is only partially initialized: its bitfields (`acc`, `fp`, `c`, `r`) are set, but the `reserved` bit is left uninitialized. This partially uninitialized byte is then copied to `*oldkey`. In `handle_sske()`, `oldkey.skey` is bitwise ORed into the guest's general purpose register (`vcpu-\u003erun-\u003es.regs.gprs[reg1]`). Since `vcpu-\u003erun` is shared with userspace (e.g., QEMU), this leaks 1 bit of uninitialized kernel stack memory to userspace.\n\nKMSAN is specifically designed to detect uses of uninitialized memory and kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and UBSAN cannot detect this issue because there is no out-of-bounds access, invalid free, or locking violation involved in this specific path. The patch fixes this by explicitly initializing `prev.skey = 0;`.\n\n(Note: The patch also fixes a NULL pointer dereference in `handle_pfmf` and locking bugs in `pgste_set_unlock_multiple` and `kvm_s390_set_irq_state`, which would be caught by KASAN and LOCKDEP. However, the uninitialized stack memory leak strictly requires KMSAN).",
"NeedsKMSAN": true,
"Reasoning": "The patch modifies core KVM functionality for the s390 architecture, including interrupt injection, storage keys handling, shadow page tables, and protected virtualization state clearing. These changes are reachable via KVM ioctls and guest execution, making them functional and worth fuzzing.",
"WorthFuzzing": true
} |
| 1/1 | 2026/08/12 10:56 | action | read-patch-diff |
0mArgs:null Results: {
"PatchDiff": "commit 1bc8b259123223efa2a02b2a5757befc15086cdb\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Wed Aug 12 10:56:42 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c\nindex 3f2d6e8902d76..f2ea013cb33e2 100644\n--- a/arch/s390/kvm/dat.c\n+++ b/arch/s390/kvm/dat.c\n@@ -722,9 +722,12 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf\n \tif (rc)\n \t\treturn rc;\n \n-\tif (!ptep)\n+\tif (!ptep) {\n+\t\tif (!oldkey)\n+\t\t\toldkey = \u0026prev;\n \t\treturn page_cond_set_storage_key(large_crste_to_phys(*crstep, gfn), skey, oldkey,\n \t\t\t\t\t\t nq, mr, mc);\n+\t}\n \n \told = pgste_get_lock(ptep);\n \tpgste = old;\n@@ -734,6 +737,7 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf\n \tpgste.fp = skey.fp;\n \tpgste.gc = skey.c;\n \tpgste.gr = skey.r;\n+\tprev.skey = 0;\n \n \tif (!ptep-\u003eh.i) {\n \t\trc = page_cond_set_storage_key(pte_origin(*ptep), skey, \u0026prev, nq, mr, mc);\n@@ -920,11 +924,8 @@ static void pgste_set_unlock_multiple(union pte *first, int n, union pgste *pgst\n {\n \tint i;\n \n-\tfor (i = 0; i \u003c n; i++) {\n-\t\tif (!pgstes[i].pcl)\n-\t\t\tbreak;\n+\tfor (i = 0; i \u003c n; i++)\n \t\tpgste_set_unlock(first + i, pgstes[i]);\n-\t}\n }\n \n static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgstes)\n@@ -937,7 +938,7 @@ static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgs\n \t}\n \tif (i == n)\n \t\treturn true;\n-\tpgste_set_unlock_multiple(first, n, pgstes);\n+\tpgste_set_unlock_multiple(first, i, pgstes);\n \treturn false;\n }\n \ndiff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c\nindex 36102b2727fbf..f3a889988cdb6 100644\n--- a/arch/s390/kvm/gaccess.c\n+++ b/arch/s390/kvm/gaccess.c\n@@ -1507,6 +1507,7 @@ static int _do_shadow_crste(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gpa_\n static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,\n \t\t\t unsigned long saddr, struct pgtwalk *w)\n {\n+\tstruct kvm_memory_slot *slot;\n \tstruct guest_fault *entries;\n \tint flags, i, hl, gl, l, rc;\n \tunion crste *table, *host;\n@@ -1551,8 +1552,17 @@ static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,\n \t\t\treturn -EAGAIN;\n \t}\n \n+retry:\n \trc = dat_entry_walk(NULL, entries[LEVEL_MEM].gfn, sg-\u003eparent-\u003easce, DAT_WALK_LEAF,\n \t\t\t TABLE_TYPE_PAGE_TABLE, \u0026host, \u0026ptep_h);\n+\tif (rc == -ENOENT) {\n+\t\tslot = gfn_to_memslot(sg-\u003ekvm, entries[LEVEL_MEM].gfn);\n+\t\tif (!slot)\n+\t\t\treturn PGM_ADDRESSING;\n+\t\trc = gmap_link(mc, sg-\u003eparent, entries + LEVEL_MEM, slot);\n+\t\tif (!rc)\n+\t\t\tgoto retry;\n+\t}\n \tif (rc)\n \t\treturn rc;\n \ndiff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c\nindex 8f24bcd1a6d36..956164b970d06 100644\n--- a/arch/s390/kvm/interrupt.c\n+++ b/arch/s390/kvm/interrupt.c\n@@ -273,6 +273,11 @@ static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)\n \treturn test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);\n }\n \n+static inline int gisa_test_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)\n+{\n+\treturn test_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *)gisa);\n+}\n+\n static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)\n {\n \tunsigned long pending = vcpu-\u003ekvm-\u003earch.float_int.pending_irqs |\n@@ -1550,23 +1555,21 @@ static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n }\n \n #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)\n-static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n+static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)\n {\n \tstruct kvm_s390_local_interrupt *li = \u0026vcpu-\u003earch.local_int;\n \tstruct kvm_s390_stop_info *stop = \u0026li-\u003eirq.stop;\n-\tint rc = 0;\n \n \tvcpu-\u003estat.inject_stop_signal++;\n \ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_SIGP_STOP, 0, 0);\n \n \tif (irq-\u003eu.stop.flags \u0026 ~KVM_S390_STOP_SUPP_FLAGS)\n \t\treturn -EINVAL;\n-\n \tif (is_vcpu_stopped(vcpu)) {\n-\t\tif (irq-\u003eu.stop.flags \u0026 KVM_S390_STOP_FLAG_STORE_STATUS)\n-\t\t\trc = kvm_s390_store_status_unloaded(vcpu,\n-\t\t\t\t\t\tKVM_S390_STORE_STATUS_NOADDR);\n-\t\treturn rc;\n+\t\tif (!(irq-\u003eu.stop.flags \u0026 KVM_S390_STOP_FLAG_STORE_STATUS))\n+\t\t\treturn 0;\n+\t\t*storestatus = true;\n+\t\treturn -EWOULDBLOCK;\n \t}\n \n \tif (test_and_set_bit(IRQ_PEND_SIGP_STOP, \u0026li-\u003epending_irqs))\n@@ -2102,7 +2105,7 @@ void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)\n \tspin_unlock(\u0026li-\u003elock);\n }\n \n-static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n+static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)\n {\n \tint rc;\n \n@@ -2114,7 +2117,7 @@ static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n \t\trc = __inject_set_prefix(vcpu, irq);\n \t\tbreak;\n \tcase KVM_S390_SIGP_STOP:\n-\t\trc = __inject_sigp_stop(vcpu, irq);\n+\t\trc = __inject_sigp_stop(vcpu, irq, storestatus);\n \t\tbreak;\n \tcase KVM_S390_RESTART:\n \t\trc = __inject_sigp_restart(vcpu);\n@@ -2150,11 +2153,16 @@ static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n {\n \tstruct kvm_s390_local_interrupt *li = \u0026vcpu-\u003earch.local_int;\n+\tbool storestatus = false;\n \tint rc;\n \n \tspin_lock(\u0026li-\u003elock);\n-\trc = do_inject_vcpu(vcpu, irq);\n+\trc = do_inject_vcpu(vcpu, irq, \u0026storestatus);\n \tspin_unlock(\u0026li-\u003elock);\n+\n+\tif (rc == -EWOULDBLOCK \u0026\u0026 storestatus)\n+\t\trc = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);\n+\n \tif (!rc)\n \t\tkvm_s390_vcpu_wakeup(vcpu);\n \treturn rc;\n@@ -2242,7 +2250,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)\n \t\t\t\tret = -ENOMEM;\n \t\t\t\tgoto out_nolock;\n \t\t\t}\n-\t\t\tif (gisa_tac_ipm_gisc(gi-\u003eorigin, i)) {\n+\t\t\tif (gisa_test_ipm_gisc(gi-\u003eorigin, i)) {\n \t\t\t\tirq = (struct kvm_s390_irq *) \u0026buf[n];\n \t\t\t\tirq-\u003etype = KVM_S390_INT_IO(1, 0, 0, 0);\n \t\t\t\tirq-\u003eu.io.io_int_word = isc_to_int_word(i);\n@@ -2976,12 +2984,14 @@ static int adapter_indicators_set(struct kvm *kvm,\n \t\t\t\t struct s390_io_adapter *adapter,\n \t\t\t\t struct kvm_s390_adapter_int *adapter_int)\n {\n-\tunsigned long bit;\n-\tint summary_set, idx;\n \tstruct s390_map_info *ind_info, *summary_info;\n-\tvoid *map;\n \tstruct page *ind_page, *summary_page;\n \tunsigned long flags;\n+\tunsigned long bit;\n+\tint summary_set;\n+\tvoid *map;\n+\n+\tguard(srcu)(\u0026kvm-\u003esrcu);\n \n \tind_page = NULL;\n \n@@ -2992,21 +3002,20 @@ static int adapter_indicators_set(struct kvm *kvm,\n \t\tind_page = pin_map_page(kvm, adapter_int-\u003eind_addr, 0);\n \t\tif (!ind_page)\n \t\t\treturn -1;\n-\t\tidx = srcu_read_lock(\u0026kvm-\u003esrcu);\n \t\tmap = page_address(ind_page);\n \t\tbit = get_ind_bit(adapter_int-\u003eind_addr,\n \t\t\t\t adapter_int-\u003eind_offset, adapter-\u003eswap);\n \t\tset_bit(bit, map);\n-\t\tmark_page_dirty(kvm, adapter_int-\u003eind_gaddr \u003e\u003e PAGE_SHIFT);\n-\t\tset_page_dirty_lock(ind_page);\n-\t\tsrcu_read_unlock(\u0026kvm-\u003esrcu, idx);\n+\t\tset_page_dirty(ind_page);\n \t\tunpin_user_page(ind_page);\n \t} else {\n \t\tmap = page_address(ind_info-\u003epage);\n \t\tbit = get_ind_bit(ind_info-\u003eaddr, adapter_int-\u003eind_offset, adapter-\u003eswap);\n \t\tset_bit(bit, map);\n+\t\tset_page_dirty(ind_info-\u003epage);\n \t\tspin_unlock_irqrestore(\u0026adapter-\u003emaps_lock, flags);\n \t}\n+\tmark_page_dirty(kvm, gpa_to_gfn(adapter_int-\u003eind_gaddr));\n \n \tspin_lock_irqsave(\u0026adapter-\u003emaps_lock, flags);\n \tsummary_info = get_map_info(adapter, adapter_int-\u003esummary_addr);\n@@ -3015,22 +3024,21 @@ static int adapter_indicators_set(struct kvm *kvm,\n \t\tsummary_page = pin_map_page(kvm, adapter_int-\u003esummary_addr, 0);\n \t\tif (WARN_ON_ONCE(!summary_page))\n \t\t\treturn -1;\n-\t\tidx = srcu_read_lock(\u0026kvm-\u003esrcu);\n \t\tmap = page_address(summary_page);\n \t\tbit = get_ind_bit(adapter_int-\u003esummary_addr,\n \t\t\t\t adapter_int-\u003esummary_offset, adapter-\u003eswap);\n \t\tsummary_set = test_and_set_bit(bit, map);\n-\t\tmark_page_dirty(kvm, adapter_int-\u003esummary_gaddr \u003e\u003e PAGE_SHIFT);\n-\t\tset_page_dirty_lock(summary_page);\n-\t\tsrcu_read_unlock(\u0026kvm-\u003esrcu, idx);\n+\t\tset_page_dirty(summary_page);\n \t\tunpin_user_page(summary_page);\n \t} else {\n \t\tmap = page_address(summary_info-\u003epage);\n \t\tbit = get_ind_bit(summary_info-\u003eaddr, adapter_int-\u003esummary_offset,\n \t\t\t\t adapter-\u003eswap);\n \t\tsummary_set = test_and_set_bit(bit, map);\n+\t\tset_page_dirty(summary_info-\u003epage);\n \t\tspin_unlock_irqrestore(\u0026adapter-\u003emaps_lock, flags);\n \t}\n+\tmark_page_dirty(kvm, gpa_to_gfn(adapter_int-\u003esummary_gaddr));\n \n \treturn summary_set ? 0 : 1;\n }\n@@ -3040,26 +3048,30 @@ static int adapter_indicators_set_fast(struct kvm *kvm,\n \t\t\t\t struct kvm_s390_adapter_int *adapter_int,\n \t\t\t\t int setbit)\n {\n+\tstruct s390_map_info *ind_info, *summary_info;\n \tunsigned long bit;\n \tint summary_set;\n-\tstruct s390_map_info *ind_info, *summary_info;\n \tvoid *map;\n \n-\tspin_lock(\u0026adapter-\u003emaps_lock);\n+\tguard(srcu)(\u0026kvm-\u003esrcu);\n+\tguard(spinlock)(\u0026adapter-\u003emaps_lock);\n+\n \tind_info = get_map_info(adapter, adapter_int-\u003eind_addr);\n-\tif (!ind_info) {\n-\t\tspin_unlock(\u0026adapter-\u003emaps_lock);\n+\tif (!ind_info)\n \t\treturn -EWOULDBLOCK;\n-\t}\n+\n \tmap = page_address(ind_info-\u003epage);\n \tbit = get_ind_bit(ind_info-\u003eaddr, adapter_int-\u003eind_offset, adapter-\u003eswap);\n-\tif (setbit)\n+\tif (setbit) {\n+\t\tmark_page_dirty(kvm, gpa_to_gfn(adapter_int-\u003eind_gaddr));\n+\t\tset_page_dirty(ind_info-\u003epage);\n \t\tset_bit(bit, map);\n+\t}\n+\n \tsummary_info = get_map_info(adapter, adapter_int-\u003esummary_addr);\n-\tif (!summary_info) {\n-\t\tspin_unlock(\u0026adapter-\u003emaps_lock);\n+\tif (!summary_info)\n \t\treturn -EWOULDBLOCK;\n-\t}\n+\n \tmap = page_address(summary_info-\u003epage);\n \tbit = get_ind_bit(summary_info-\u003eaddr, adapter_int-\u003esummary_offset,\n \t\t\t adapter-\u003eswap);\n@@ -3069,7 +3081,9 @@ static int adapter_indicators_set_fast(struct kvm *kvm,\n \t\tsummary_set = test_and_set_bit(bit, map);\n \telse\n \t\tsummary_set = test_and_clear_bit(bit, map);\n-\tspin_unlock(\u0026adapter-\u003emaps_lock);\n+\tmark_page_dirty(kvm, gpa_to_gfn(adapter_int-\u003esummary_gaddr));\n+\tset_page_dirty(summary_info-\u003epage);\n+\n \treturn summary_set ? 0 : 1;\n }\n \n@@ -3197,7 +3211,8 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,\n int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)\n {\n \tstruct kvm_s390_local_interrupt *li = \u0026vcpu-\u003earch.local_int;\n-\tstruct kvm_s390_irq *buf;\n+\tstruct kvm_s390_irq *buf __free(kvfree) = NULL;\n+\tbool tmp, storestatus = false;\n \tint r = 0;\n \tint n;\n \n@@ -3205,31 +3220,33 @@ int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len\n \tif (!buf)\n \t\treturn -ENOMEM;\n \n-\tif (copy_from_user((void *) buf, irqstate, len)) {\n-\t\tr = -EFAULT;\n-\t\tgoto out_free;\n-\t}\n+\tif (copy_from_user((void *)buf, irqstate, len))\n+\t\treturn -EFAULT;\n \n-\t/*\n-\t * Don't allow setting the interrupt state\n-\t * when there are already interrupts pending\n-\t */\n-\tspin_lock(\u0026li-\u003elock);\n-\tif (li-\u003epending_irqs) {\n-\t\tr = -EBUSY;\n-\t\tgoto out_unlock;\n-\t}\n+\tscoped_guard(spinlock, \u0026li-\u003elock) {\n+\t\t/*\n+\t\t * Don't allow setting the interrupt state\n+\t\t * when there are already interrupts pending\n+\t\t */\n+\t\tif (li-\u003epending_irqs)\n+\t\t\treturn -EBUSY;\n \n-\tfor (n = 0; n \u003c len / sizeof(*buf); n++) {\n-\t\tr = do_inject_vcpu(vcpu, \u0026buf[n]);\n-\t\tif (r)\n-\t\t\tbreak;\n+\t\tfor (n = 0; n \u003c len / sizeof(*buf); n++) {\n+\t\t\ttmp = false;\n+\t\t\tr = do_inject_vcpu(vcpu, \u0026buf[n], \u0026tmp);\n+\t\t\tif (r == -EWOULDBLOCK \u0026\u0026 tmp) {\n+\t\t\t\tstorestatus = true;\n+\t\t\t\tr = 0;\n+\t\t\t}\n+\t\t\tif (r)\n+\t\t\t\tbreak;\n+\t\t}\n \t}\n \n-out_unlock:\n-\tspin_unlock(\u0026li-\u003elock);\n-out_free:\n-\tvfree(buf);\n+\tif (storestatus) {\n+\t\tn = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);\n+\t\treturn r ? r : n;\n+\t}\n \n \treturn r;\n }\ndiff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c\nindex 518a69c55e85c..b35340642c3ed 100644\n--- a/arch/s390/kvm/kvm-s390.c\n+++ b/arch/s390/kvm/kvm-s390.c\n@@ -5450,7 +5450,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n \n \t\tif (copy_from_user(\u0026s390irq, argp, sizeof(s390irq)))\n \t\t\treturn -EFAULT;\n-\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026s390irq);\n+\t\tscoped_guard(srcu, \u0026vcpu-\u003ekvm-\u003esrcu)\n+\t\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026s390irq);\n \t\tbreak;\n \t}\n \tcase KVM_S390_INTERRUPT: {\n@@ -5463,7 +5464,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n \t\t\treturn -EFAULT;\n \t\tif (s390int_to_s390irq(\u0026s390int, \u0026s390irq))\n \t\t\treturn -EINVAL;\n-\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026s390irq);\n+\t\tscoped_guard(srcu, \u0026vcpu-\u003ekvm-\u003esrcu)\n+\t\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026s390irq);\n \t\tbreak;\n \t}\n \tdefault:\ndiff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c\nindex b02e0159d3cd2..98a9a57f71b9e 100644\n--- a/arch/s390/kvm/pv.c\n+++ b/arch/s390/kvm/pv.c\n@@ -242,6 +242,10 @@ static void kvm_s390_clear_pv_state(struct kvm *kvm)\n \tkvm-\u003earch.pv.guest_len = 0;\n \tkvm-\u003earch.pv.stor_base = 0;\n \tkvm-\u003earch.pv.stor_var = NULL;\n+\tif (kvm-\u003earch.pv.dumping) {\n+\t\tkvm_s390_vcpu_unblock_all(kvm);\n+\t\tkvm-\u003earch.pv.dumping = false;\n+\t}\n }\n \n static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)\n"
} |
| 2/1 | 2026/08/12 10:56 | agent | patch-evaluator |
2mModel:best-expensive Args: null Results: {
"EnableConfigs": [
"KVM"
],
"FocusSymbols": [
"dat_cond_set_storage_key",
"kvm_s390_inject_vcpu",
"kvm_s390_set_irq_state",
"kvm_arch_set_irq_inatomic",
"kvm_s390_pv_deinit_vm",
"kvm_s390_pv_init_vm",
"kvm_s390_pv_set_aside",
"guest_translate_address_with_key"
],
"Reasoning": "The patch modifies core KVM functionality for the s390 architecture, including interrupt injection, storage keys handling, shadow page tables, and protected virtualization state clearing. These changes are reachable via KVM ioctls and guest execution, making them functional and worth fuzzing.",
"WorthFuzzing": true
}Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes:
commit 1bc8b259123223efa2a02b2a5757befc15086cdb
Author: syz-cluster <triage@syzkaller.com>
Date: Wed Aug 12 10:56:42 2026 +0000
syz-cluster: applied patch under review
diff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c
index 3f2d6e8902d76..f2ea013cb33e2 100644
--- a/arch/s390/kvm/dat.c
+++ b/arch/s390/kvm/dat.c
@@ -722,9 +722,12 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf
if (rc)
return rc;
- if (!ptep)
+ if (!ptep) {
+ if (!oldkey)
+ oldkey = &prev;
return page_cond_set_storage_key(large_crste_to_phys(*crstep, gfn), skey, oldkey,
nq, mr, mc);
+ }
old = pgste_get_lock(ptep);
pgste = old;
@@ -734,6 +737,7 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf
pgste.fp = skey.fp;
pgste.gc = skey.c;
pgste.gr = skey.r;
+ prev.skey = 0;
if (!ptep->h.i) {
rc = page_cond_set_storage_key(pte_origin(*ptep), skey, &prev, nq, mr, mc);
@@ -920,11 +924,8 @@ static void pgste_set_unlock_multiple(union pte *first, int n, union pgste *pgst
{
int i;
- for (i = 0; i < n; i++) {
- if (!pgstes[i].pcl)
- break;
+ for (i = 0; i < n; i++)
pgste_set_unlock(first + i, pgstes[i]);
- }
}
static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgstes)
@@ -937,7 +938,7 @@ static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgs
}
if (i == n)
return true;
- pgste_set_unlock_multiple(first, n, pgstes);
+ pgste_set_unlock_multiple(first, i, pgstes);
return false;
}
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 36102b2727fbf..f3a889988cdb6 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -1507,6 +1507,7 @@ static int _do_shadow_crste(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gpa_
static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
unsigned long saddr, struct pgtwalk *w)
{
+ struct kvm_memory_slot *slot;
struct guest_fault *entries;
int flags, i, hl, gl, l, rc;
union crste *table, *host;
@@ -1551,8 +1552,17 @@ static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
return -EAGAIN;
}
+retry:
rc = dat_entry_walk(NULL, entries[LEVEL_MEM].gfn, sg->parent->asce, DAT_WALK_LEAF,
TABLE_TYPE_PAGE_TABLE, &host, &ptep_h);
+ if (rc == -ENOENT) {
+ slot = gfn_to_memslot(sg->kvm, entries[LEVEL_MEM].gfn);
+ if (!slot)
+ return PGM_ADDRESSING;
+ rc = gmap_link(mc, sg->parent, entries + LEVEL_MEM, slot);
+ if (!rc)
+ goto retry;
+ }
if (rc)
return rc;
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 8f24bcd1a6d36..956164b970d06 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -273,6 +273,11 @@ static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
}
+static inline int gisa_test_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+ return test_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *)gisa);
+}
+
static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
{
unsigned long pending = vcpu->kvm->arch.float_int.pending_irqs |
@@ -1550,23 +1555,21 @@ static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
}
#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
-static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
struct kvm_s390_stop_info *stop = &li->irq.stop;
- int rc = 0;
vcpu->stat.inject_stop_signal++;
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
return -EINVAL;
-
if (is_vcpu_stopped(vcpu)) {
- if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
- rc = kvm_s390_store_status_unloaded(vcpu,
- KVM_S390_STORE_STATUS_NOADDR);
- return rc;
+ if (!(irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS))
+ return 0;
+ *storestatus = true;
+ return -EWOULDBLOCK;
}
if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
@@ -2102,7 +2105,7 @@ void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
spin_unlock(&li->lock);
}
-static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)
{
int rc;
@@ -2114,7 +2117,7 @@ static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
rc = __inject_set_prefix(vcpu, irq);
break;
case KVM_S390_SIGP_STOP:
- rc = __inject_sigp_stop(vcpu, irq);
+ rc = __inject_sigp_stop(vcpu, irq, storestatus);
break;
case KVM_S390_RESTART:
rc = __inject_sigp_restart(vcpu);
@@ -2150,11 +2153,16 @@ static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ bool storestatus = false;
int rc;
spin_lock(&li->lock);
- rc = do_inject_vcpu(vcpu, irq);
+ rc = do_inject_vcpu(vcpu, irq, &storestatus);
spin_unlock(&li->lock);
+
+ if (rc == -EWOULDBLOCK && storestatus)
+ rc = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);
+
if (!rc)
kvm_s390_vcpu_wakeup(vcpu);
return rc;
@@ -2242,7 +2250,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
ret = -ENOMEM;
goto out_nolock;
}
- if (gisa_tac_ipm_gisc(gi->origin, i)) {
+ if (gisa_test_ipm_gisc(gi->origin, i)) {
irq = (struct kvm_s390_irq *) &buf[n];
irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
irq->u.io.io_int_word = isc_to_int_word(i);
@@ -2976,12 +2984,14 @@ static int adapter_indicators_set(struct kvm *kvm,
struct s390_io_adapter *adapter,
struct kvm_s390_adapter_int *adapter_int)
{
- unsigned long bit;
- int summary_set, idx;
struct s390_map_info *ind_info, *summary_info;
- void *map;
struct page *ind_page, *summary_page;
unsigned long flags;
+ unsigned long bit;
+ int summary_set;
+ void *map;
+
+ guard(srcu)(&kvm->srcu);
ind_page = NULL;
@@ -2992,21 +3002,20 @@ static int adapter_indicators_set(struct kvm *kvm,
ind_page = pin_map_page(kvm, adapter_int->ind_addr, 0);
if (!ind_page)
return -1;
- idx = srcu_read_lock(&kvm->srcu);
map = page_address(ind_page);
bit = get_ind_bit(adapter_int->ind_addr,
adapter_int->ind_offset, adapter->swap);
set_bit(bit, map);
- mark_page_dirty(kvm, adapter_int->ind_gaddr >> PAGE_SHIFT);
- set_page_dirty_lock(ind_page);
- srcu_read_unlock(&kvm->srcu, idx);
+ set_page_dirty(ind_page);
unpin_user_page(ind_page);
} else {
map = page_address(ind_info->page);
bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap);
set_bit(bit, map);
+ set_page_dirty(ind_info->page);
spin_unlock_irqrestore(&adapter->maps_lock, flags);
}
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->ind_gaddr));
spin_lock_irqsave(&adapter->maps_lock, flags);
summary_info = get_map_info(adapter, adapter_int->summary_addr);
@@ -3015,22 +3024,21 @@ static int adapter_indicators_set(struct kvm *kvm,
summary_page = pin_map_page(kvm, adapter_int->summary_addr, 0);
if (WARN_ON_ONCE(!summary_page))
return -1;
- idx = srcu_read_lock(&kvm->srcu);
map = page_address(summary_page);
bit = get_ind_bit(adapter_int->summary_addr,
adapter_int->summary_offset, adapter->swap);
summary_set = test_and_set_bit(bit, map);
- mark_page_dirty(kvm, adapter_int->summary_gaddr >> PAGE_SHIFT);
- set_page_dirty_lock(summary_page);
- srcu_read_unlock(&kvm->srcu, idx);
+ set_page_dirty(summary_page);
unpin_user_page(summary_page);
} else {
map = page_address(summary_info->page);
bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset,
adapter->swap);
summary_set = test_and_set_bit(bit, map);
+ set_page_dirty(summary_info->page);
spin_unlock_irqrestore(&adapter->maps_lock, flags);
}
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->summary_gaddr));
return summary_set ? 0 : 1;
}
@@ -3040,26 +3048,30 @@ static int adapter_indicators_set_fast(struct kvm *kvm,
struct kvm_s390_adapter_int *adapter_int,
int setbit)
{
+ struct s390_map_info *ind_info, *summary_info;
unsigned long bit;
int summary_set;
- struct s390_map_info *ind_info, *summary_info;
void *map;
- spin_lock(&adapter->maps_lock);
+ guard(srcu)(&kvm->srcu);
+ guard(spinlock)(&adapter->maps_lock);
+
ind_info = get_map_info(adapter, adapter_int->ind_addr);
- if (!ind_info) {
- spin_unlock(&adapter->maps_lock);
+ if (!ind_info)
return -EWOULDBLOCK;
- }
+
map = page_address(ind_info->page);
bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap);
- if (setbit)
+ if (setbit) {
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->ind_gaddr));
+ set_page_dirty(ind_info->page);
set_bit(bit, map);
+ }
+
summary_info = get_map_info(adapter, adapter_int->summary_addr);
- if (!summary_info) {
- spin_unlock(&adapter->maps_lock);
+ if (!summary_info)
return -EWOULDBLOCK;
- }
+
map = page_address(summary_info->page);
bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset,
adapter->swap);
@@ -3069,7 +3081,9 @@ static int adapter_indicators_set_fast(struct kvm *kvm,
summary_set = test_and_set_bit(bit, map);
else
summary_set = test_and_clear_bit(bit, map);
- spin_unlock(&adapter->maps_lock);
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->summary_gaddr));
+ set_page_dirty(summary_info->page);
+
return summary_set ? 0 : 1;
}
@@ -3197,7 +3211,8 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- struct kvm_s390_irq *buf;
+ struct kvm_s390_irq *buf __free(kvfree) = NULL;
+ bool tmp, storestatus = false;
int r = 0;
int n;
@@ -3205,31 +3220,33 @@ int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len
if (!buf)
return -ENOMEM;
- if (copy_from_user((void *) buf, irqstate, len)) {
- r = -EFAULT;
- goto out_free;
- }
+ if (copy_from_user((void *)buf, irqstate, len))
+ return -EFAULT;
- /*
- * Don't allow setting the interrupt state
- * when there are already interrupts pending
- */
- spin_lock(&li->lock);
- if (li->pending_irqs) {
- r = -EBUSY;
- goto out_unlock;
- }
+ scoped_guard(spinlock, &li->lock) {
+ /*
+ * Don't allow setting the interrupt state
+ * when there are already interrupts pending
+ */
+ if (li->pending_irqs)
+ return -EBUSY;
- for (n = 0; n < len / sizeof(*buf); n++) {
- r = do_inject_vcpu(vcpu, &buf[n]);
- if (r)
- break;
+ for (n = 0; n < len / sizeof(*buf); n++) {
+ tmp = false;
+ r = do_inject_vcpu(vcpu, &buf[n], &tmp);
+ if (r == -EWOULDBLOCK && tmp) {
+ storestatus = true;
+ r = 0;
+ }
+ if (r)
+ break;
+ }
}
-out_unlock:
- spin_unlock(&li->lock);
-out_free:
- vfree(buf);
+ if (storestatus) {
+ n = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);
+ return r ? r : n;
+ }
return r;
}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 518a69c55e85c..b35340642c3ed 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5450,7 +5450,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,
if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
return -EFAULT;
- rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
+ scoped_guard(srcu, &vcpu->kvm->srcu)
+ rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
break;
}
case KVM_S390_INTERRUPT: {
@@ -5463,7 +5464,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,
return -EFAULT;
if (s390int_to_s390irq(&s390int, &s390irq))
return -EINVAL;
- rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
+ scoped_guard(srcu, &vcpu->kvm->srcu)
+ rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
break;
}
default:
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index b02e0159d3cd2..98a9a57f71b9e 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -242,6 +242,10 @@ static void kvm_s390_clear_pv_state(struct kvm *kvm)
kvm->arch.pv.guest_len = 0;
kvm->arch.pv.stor_base = 0;
kvm->arch.pv.stor_var = NULL;
+ if (kvm->arch.pv.dumping) {
+ kvm_s390_vcpu_unblock_all(kvm);
+ kvm->arch.pv.dumping = false;
+ }
}
static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)
|
| 3/2 | 2026/08/12 10:56 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7797 output: 28 thoughts: 780 Thoughts: **Analyzing Potential KVM Vulnerabilities on s390x** Okay, so I've got a patch series here that's been applied to the Linux kernel, specifically targeting the s390 architecture's KVM code. This is interesting, as these changes are touching core functionality within `arch/s390/kvm/` – things like data access tables, interrupt handling, and the general KVM setup. I need to understand the attack surface here. I see they've modified functions like `dat_cond_set_storage_key`, `_gaccess_do_shadow`, various interrupt-related functions such as `__inject_sigp_stop`, and some clear state functions. Immediately, my mind jumps to reachability. Is this exposed in any way from a user-space context, or are these purely internal KVM operations? Alright, s390x KVM runs under QEMU, and syzkaller can target it. Great, this means there is an existing fuzzing harness to explore this. Although it usually runs on x86_64, syzkaller does support s390x, so fuzzing KVM on s390x directly is feasible. The most important thing here is `CONFIG_KVM` is configured. Now, let's drill down into the modified functions themselves. Specifically, functions like `kvm_s390_inject_vcpu` and `kvm_s390_set_irq_state` are worth further investigation. I need to determine if they're reachable via ioctls or are exposed via another means. A quick grep shows `kvm_s390_inject_vcpu` is called from `kvm_arch_vcpu_unlocked_ioctl` - interesting - the `KVM_S390_INTERRUPT` and `KVM_S390_IRQ` ioctls. So, potentially a vulnerability in `kvm_arch_vcpu_unlocked_ioctl`, or perhaps in how those ioctls are handled with regard to these newly modified functions could be present. My next step will be to dive deeper into those ioctls, looking for the potential for bugs. Let's see if `kvm_s390_set_irq_state` is similar, called directly from ioctls. |
| 4/2 | 2026/08/12 10:56 | tool | grepper |
0mArgs:{
"Expression": "kvm_s390_set_irq_state"
}Results: {
"Output": "arch/s390/kvm/interrupt.c=3205=int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,\n--\narch/s390/kvm/interrupt.c-3210-\narch/s390/kvm/interrupt.c:3211:int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)\narch/s390/kvm/interrupt.c-3212-{\n--\narch/s390/kvm/kvm-s390.c=5531=long kvm_arch_vcpu_ioctl(struct file *filp,\n--\narch/s390/kvm/kvm-s390.c-5693-\t\t/* do not use irq_state.flags, it will break old QEMUs */\narch/s390/kvm/kvm-s390.c:5694:\t\tr = kvm_s390_set_irq_state(vcpu,\narch/s390/kvm/kvm-s390.c-5695-\t\t\t\t\t (void __user *) irq_state.buf,\n--\narch/s390/kvm/kvm-s390.h=552=void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:553:int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.h-554-\t\t\t void __user *buf, int len);\n"
} |
| 5/2 | 2026/08/12 10:56 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9598 output: 19 thoughts: 70 Thoughts: **Analyzing the Path to `kvm_s390_set_irq_state`** Okay, so I'm tracing the execution path and it looks like `kvm_s390_set_irq_state` is definitely accessible through `kvm_arch_vcpu_ioctl`. That suggests we're likely dealing with a `KVM_S390_SET_IRQ_STATE` ioctl call. I need to confirm this, but that's the most probable route. Now, where does this functionality actually get used? Let's dig deeper and see what we can learn from `adapter_indicators_set` and `adapter_indicators_set_fast`. These functions seem like logical candidates to investigate next, as they're directly related to managing and setting indicators, and that sounds like what the IRQ state functionality deals with. These functions might reveal critical insights into the context and usage of `kvm_s390_set_irq_state`. |
| 6/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "adapter_indicators_set"
}Results: {
"Output": "arch/s390/kvm/interrupt.c=2965=static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,\n--\narch/s390/kvm/interrupt.c-2982-\narch/s390/kvm/interrupt.c:2983:static int adapter_indicators_set(struct kvm *kvm,\narch/s390/kvm/interrupt.c-2984-\t\t\t\t struct s390_io_adapter *adapter,\n--\narch/s390/kvm/interrupt.c-3045-\narch/s390/kvm/interrupt.c:3046:static int adapter_indicators_set_fast(struct kvm *kvm,\narch/s390/kvm/interrupt.c-3047-\t\t\t\t struct s390_io_adapter *adapter,\n--\narch/s390/kvm/interrupt.c=3095=static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,\n--\narch/s390/kvm/interrupt.c-3109-\t\treturn -1;\narch/s390/kvm/interrupt.c:3110:\tret = adapter_indicators_set(kvm, adapter, \u0026e-\u003eadapter);\narch/s390/kvm/interrupt.c-3111-\tif ((ret \u003e 0) \u0026\u0026 !adapter-\u003emasked) {\n--\narch/s390/kvm/interrupt.c=3768=int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\n--\narch/s390/kvm/interrupt.c-3794-\tsetbit = 1;\narch/s390/kvm/interrupt.c:3795:\tret = adapter_indicators_set_fast(kvm, adapter, \u0026e-\u003eadapter, setbit);\narch/s390/kvm/interrupt.c-3796-\tif (ret \u003c 0)\n--\narch/s390/kvm/interrupt.c-3805-\t\tsetbit = 0;\narch/s390/kvm/interrupt.c:3806:\t\tadapter_indicators_set_fast(kvm, adapter, \u0026e-\u003eadapter, setbit);\narch/s390/kvm/interrupt.c-3807-\t\treturn -EWOULDBLOCK;\n--\narch/s390/kvm/interrupt.c-3815-\t\t\tsetbit = 0;\narch/s390/kvm/interrupt.c:3816:\t\t\tadapter_indicators_set_fast(kvm, adapter, \u0026e-\u003eadapter, setbit);\narch/s390/kvm/interrupt.c-3817-\t\t\tkfree(inti);\n--\narch/s390/kvm/interrupt.c-3838-\t\tsetbit = 0;\narch/s390/kvm/interrupt.c:3839:\t\tadapter_indicators_set_fast(kvm, adapter, \u0026e-\u003eadapter, setbit);\narch/s390/kvm/interrupt.c-3840-\t\tkfree(inti);\n"
} |
| 7/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10739 output: 23 thoughts: 24 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Investigating Interrupt Routing and Data Conditions** Okay, so we're dealing with interrupt routing here, and my goal is to trace the path and understand how it connects to the underlying data conditions. The key question is always: where does it all *start*? Given the context, I immediately think of exploring a function related to setting storage keys - that seems like a likely entry point for managing data that would be used to drive interrupt conditions. Let's start with `dat_cond_set_storage_key`. Examining this function should give a good first-order understanding of the data flow and any related interrupt enablement logic. From there, I can determine where to go next based on what I find. |
| 8/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "dat_cond_set_storage_key"
}Results: {
"Output": "arch/s390/kvm/dat.c=700=static bool page_cond_set_storage_key(phys_addr_t paddr, union skey skey, union skey *oldkey,\n--\narch/s390/kvm/dat.c-710-\narch/s390/kvm/dat.c:711:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.c-712-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc)\n--\narch/s390/kvm/dat.h=536=int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.h-537-\t\t\tunion skey skey, bool nq);\narch/s390/kvm/dat.h:538:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.h-539-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc);\n--\narch/s390/kvm/kvm-s390.c=562=static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op,\n--\narch/s390/kvm/kvm-s390.c-572-\tcase KVM_S390_KEYOP_SSKE:\narch/s390/kvm/kvm-s390.c:573:\t\tr = dat_cond_set_storage_key(mc, asce, gfn, skey, \u0026skey, 0, 0, 0);\narch/s390/kvm/kvm-s390.c-574-\t\tif (r == 0 || r == 1)\n--\narch/s390/kvm/priv.c=324=static int handle_sske(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-362-\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\narch/s390/kvm/priv.c:363:\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\narch/s390/kvm/priv.c-364-\t\t\t\t\t\t gpa_to_gfn(start), key, \u0026oldkey,\n--\narch/s390/kvm/priv.c=1046=static int handle_pfmf(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1120-\t\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\narch/s390/kvm/priv.c:1121:\t\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\narch/s390/kvm/priv.c-1122-\t\t\t\t\t\t\t gpa_to_gfn(start), key,\n"
} |
| 9/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11878 output: 21 thoughts: 53 Thoughts: Here's my summary, as though I'm thinking through this process: **Diving into s390 KVM Instruction Handlers** Okay, so `dat_cond_set_storage_key`. I know that's reachable from `handle_sske` and `handle_pfmf`. Those are the instruction handlers, specifically for s390 KVM. My mental map is already starting to form... they're the entry points, the hooks for those instructions in the hypervisor. Now, where does this storage key function live? What's the context? I need to understand how the storage keys are set. Let me quickly check `_gaccess_do_shadow` because I suspect that's relevant to how the system handles the shadow state... and since storage keys are probably related to memory access, I bet `_gaccess_do_shadow` has something to do with the storage key shadowing functionality. |
| 10/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "_gaccess_do_shadow"
}Results: {
"Output": "arch/s390/kvm/gaccess.c=1465=static int _do_shadow_crste(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gpa_t raddr,\n--\narch/s390/kvm/gaccess.c-1506-\narch/s390/kvm/gaccess.c:1507:static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,\narch/s390/kvm/gaccess.c-1508-\t\t\t unsigned long saddr, struct pgtwalk *w)\n--\narch/s390/kvm/gaccess.c=1595=static inline int ___gaccess_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *sg, gpa_t saddr,\n--\narch/s390/kvm/gaccess.c-1609-\t\tsg-\u003einvalidated = false;\narch/s390/kvm/gaccess.c:1610:\t\trc = _gaccess_do_shadow(vcpu-\u003earch.mc, sg, saddr, walk);\narch/s390/kvm/gaccess.c-1611-\t}\n"
} |
| 11/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 12489 output: 21 thoughts: 44 Thoughts: Okay, here's my interpretation of those thoughts, presented as my own mental process, given my expertise: **Shadow Fault Analysis & Signal Injection** Right, so I'm looking at this `_gaccess_do_shadow` function. The key here is it's reachable through `___gaccess_shadow_fault`, and that, in turn, is *likely* triggered by accesses from the guest's memory. This is a common pattern for shadow page table implementations and I'm guessing this might have something to do with handling those. We should examine how `___gaccess_shadow_fault` is being called and see how `_gaccess_do_shadow` is being used and why it's potentially important to figure out its use case. This strongly suggests we're dealing with a system that's monitoring or intercepting guest memory accesses. I'm immediately thinking security implications. Now, let's pivot to `__inject_sigp_stop`. My intuition is this is a crucial signal injection mechanism. Given that we're talking about guest memory accesses and a potential shadow fault, I need to understand how *this* function interacts with all of that. Perhaps, it's used to trigger something to happen during a shadow fault. Or potentially to inject a stop signal when there is a memory access violation. I need to figure out what happens when that function is called. Is it part of the security architecture or a debugging functionality? Is this a standard part of the hypervisor, or something custom? A better understanding of this can reveal a lot. The interaction between shadow faults and signal injection is very interesting. |
| 12/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "__inject_sigp_stop"
}Results: {
"Output": "arch/s390/kvm/interrupt.c=1538=static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-1557-#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)\narch/s390/kvm/interrupt.c:1558:static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)\narch/s390/kvm/interrupt.c-1559-{\n--\narch/s390/kvm/interrupt.c=2108=static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)\n--\narch/s390/kvm/interrupt.c-2119-\tcase KVM_S390_SIGP_STOP:\narch/s390/kvm/interrupt.c:2120:\t\trc = __inject_sigp_stop(vcpu, irq, storestatus);\narch/s390/kvm/interrupt.c-2121-\t\tbreak;\n"
} |
| 13/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13256 output: 27 thoughts: 272 Thoughts: **KVM/s390 Patch Review: Fuzzing Candidates** Okay, so this patch is clearly touching core KVM functionality for the s390 architecture. Given that, and the fact that it's either fixing bugs or modifying logic within KVM/s390, fuzzing definitely seems like a worthwhile investment of time. The question now becomes, which functions should I prioritize as targets? Let's see, the suggested focus symbols are: `dat_cond_set_storage_key`, `kvm_s390_inject_vcpu`, `adapter_indicators_set`, `adapter_indicators_set_fast`, `kvm_s390_set_irq_state`, and `kvm_s390_clear_pv_state`. Right, let's quickly check their visibility. We need to see which ones are exported and accessible from a fuzzer's perspective. Okay, `dat_cond_set_storage_key` is in `arch/s390/kvm/dat.c` and *isn't* static – good. `kvm_s390_inject_vcpu` is also non-static, so those are good candidates. `adapter_indicators_set` and `adapter_indicators_set_fast` are static, so we can probably discount those for a basic fuzzer setup, although they might still be useful to look at manually. `kvm_s390_set_irq_state` is not static. That is useful. `kvm_s390_clear_pv_state` is static. Alright, now let's dig into `kvm_s390_clear_pv_state`. |
| 14/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "kvm_s390_clear_pv_state"
}Results: {
"Output": "arch/s390/kvm/pv.c=231=struct pv_vm_to_be_destroyed {\n--\narch/s390/kvm/pv.c-238-\narch/s390/kvm/pv.c:239:static void kvm_s390_clear_pv_state(struct kvm *kvm)\narch/s390/kvm/pv.c-240-{\n--\narch/s390/kvm/pv.c=343=static void kvm_s390_pv_dealloc_vm(struct kvm *kvm)\n--\narch/s390/kvm/pv.c-347-\t\t get_order(uv_info.guest_base_stor_len));\narch/s390/kvm/pv.c:348:\tkvm_s390_clear_pv_state(kvm);\narch/s390/kvm/pv.c-349-}\n--\narch/s390/kvm/pv.c=476=int kvm_s390_pv_set_aside(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-513-\tgmap_pv_destroy_range(kvm-\u003earch.gmap, 0, gpa_to_gfn(SZ_2G), false);\narch/s390/kvm/pv.c:514:\tkvm_s390_clear_pv_state(kvm);\narch/s390/kvm/pv.c-515-\tkvm-\u003earch.pv.set_aside = priv;\n"
} |
| 15/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14381 output: 19 thoughts: 31 Thoughts: Okay, here's my take on those thoughts, framed as my own: **Analyzing `kvm_s390_pv_set_aside` and Related Logic** Alright, so the first thing that jumps out is that `kvm_s390_pv_set_aside` isn't a static element. It's dynamic, which means its behavior and state can change during runtime. This immediately raises some questions about how it's being managed and what influences its state. My expertise tells me this dynamic nature warrants a closer look at the surrounding code to understand the conditions under which it's modified. Given that it's dynamic, I should next investigate where this is used and where it is set. The next thing that I should examine is the call to `adapter_indicators_set`. This has relevance and it is worth analyzing as it may reveal related dependencies. It's likely that it holds the key to understanding the context around `kvm_s390_pv_set_aside`. I'll delve into the `adapter_indicators_set` function and see if it interacts with `kvm_s390_pv_set_aside` in some way, or if it provides any clues about the system's overall configuration. By examining `adapter_indicators_set`, I hope to uncover the relevant settings. |
| 16/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "set_adapter_int"
}Results: {
"Output": "arch/s390/include/asm/kvm_host.h=449=struct kvm_vm_stat {\n--\narch/s390/include/asm/kvm_host.h-455-\tu64 io_flic_inject_airq;\narch/s390/include/asm/kvm_host.h:456:\tu64 io_set_adapter_int;\narch/s390/include/asm/kvm_host.h-457-\tu64 io_390_inatomic_no_inject;\n--\narch/s390/kvm/interrupt.c=3046=static int adapter_indicators_set_fast(struct kvm *kvm,\n--\narch/s390/kvm/interrupt.c-3094- */\narch/s390/kvm/interrupt.c:3095:static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,\narch/s390/kvm/interrupt.c-3096-\t\t\t struct kvm *kvm, int irq_source_id, int level,\n--\narch/s390/kvm/interrupt.c-3101-\narch/s390/kvm/interrupt.c:3102:\tkvm-\u003estat.io_set_adapter_int++;\narch/s390/kvm/interrupt.c-3103-\n--\narch/s390/kvm/interrupt.c=3163=int kvm_set_routing_entry(struct kvm *kvm,\n--\narch/s390/kvm/interrupt.c-3174-\t\t\treturn -EINVAL;\narch/s390/kvm/interrupt.c:3175:\t\te-\u003eset = set_adapter_int;\narch/s390/kvm/interrupt.c-3176-\n--\narch/s390/kvm/kvm-s390.c=68=const struct kvm_stats_desc kvm_vm_stats_desc[] = {\n--\narch/s390/kvm/kvm-s390.c-74-\tSTATS_DESC_COUNTER(VM, io_flic_inject_airq),\narch/s390/kvm/kvm-s390.c:75:\tSTATS_DESC_COUNTER(VM, io_set_adapter_int),\narch/s390/kvm/kvm-s390.c-76-\tSTATS_DESC_COUNTER(VM, io_390_inatomic_no_inject),\n"
} |
| 17/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15392 output: 26 thoughts: 32 Thoughts: Okay, here's my take on those thoughts, framed as my own: **Analyzing `kvm_set_routing_entry` and its Implications** Alright, so `kvm_set_routing_entry` is exported, meaning it's accessible and designed for external use. That's a key piece of information. Now, what's its relationship to the overall interrupt routing within the KVM subsystem? It's clearly a fundamental component if it's exported. I need to understand its role within the wider framework, and how it interacts with the underlying hardware, so I have to explore the implications of this function call. My next step is to examine `kvm_arch_set_irq_inatomic`. This function's name implies atomic operations related to interrupt requests. If `kvm_set_routing_entry` is handling *where* interrupts go, `kvm_arch_set_irq_inatomic` is likely handling *how* those interrupts are processed at the architecture level, which suggests some intricate details about the interrupt handling mechanism. This could reveal important insights into concurrency control, interrupt masking, or interrupt delivery. I anticipate seeing how these two functions are intertwined in the KVM infrastructure. It could be revealing to see the differences. I can see the potential for a deeper dive into the relationship between these two functions. |
| 18/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "kvm_arch_set_irq_inatomic"
}Results: {
"Output": "arch/arm64/kvm/vgic/vgic-irqfd.c=92=int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,\n--\narch/arm64/kvm/vgic/vgic-irqfd.c-108-/*\narch/arm64/kvm/vgic/vgic-irqfd.c:109: * kvm_arch_set_irq_inatomic: fast-path for irqfd injection\narch/arm64/kvm/vgic/vgic-irqfd.c-110- */\narch/arm64/kvm/vgic/vgic-irqfd.c:111:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\narch/arm64/kvm/vgic/vgic-irqfd.c-112-\t\t\t struct kvm *kvm, int irq_source_id, int level,\n--\narch/loongarch/kvm/irqfd.c=44=int kvm_set_routing_entry(struct kvm *kvm,\n--\narch/loongarch/kvm/irqfd.c-69-\narch/loongarch/kvm/irqfd.c:70:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\narch/loongarch/kvm/irqfd.c-71-\t\tstruct kvm *kvm, int irq_source_id, int level, bool line_status)\n--\narch/powerpc/kvm/book3s.c=1022=int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,\n--\narch/powerpc/kvm/book3s.c-1032-\narch/powerpc/kvm/book3s.c:1033:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *irq_entry,\narch/powerpc/kvm/book3s.c-1034-\t\t\t struct kvm *kvm, int irq_source_id,\n--\narch/riscv/kvm/vm.c=119=int kvm_set_routing_entry(struct kvm *kvm,\n--\narch/riscv/kvm/vm.c-149-\narch/riscv/kvm/vm.c:150:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\narch/riscv/kvm/vm.c-151-\t\t\t struct kvm *kvm, int irq_source_id, int level,\n--\narch/s390/kvm/interrupt.c=3710=int __init kvm_s390_gib_init(u8 nisc)\n--\narch/s390/kvm/interrupt.c-3765-/*\narch/s390/kvm/interrupt.c:3766: * kvm_arch_set_irq_inatomic: fast-path for irqfd injection\narch/s390/kvm/interrupt.c-3767- */\narch/s390/kvm/interrupt.c:3768:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\narch/s390/kvm/interrupt.c-3769-\t\t\t struct kvm *kvm, int irq_source_id, int level,\n--\narch/x86/kvm/irq.c=225=int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,\n--\narch/x86/kvm/irq.c-240-\narch/x86/kvm/irq.c:241:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\narch/x86/kvm/irq.c-242-\t\t\t struct kvm *kvm, int irq_source_id, int level,\n--\narch/x86/kvm/xen.c=1774=static void kvm_xen_check_poller(struct kvm_vcpu *vcpu, int port)\n--\narch/x86/kvm/xen.c-1791- *\narch/x86/kvm/xen.c:1792: * It is also called directly from kvm_arch_set_irq_inatomic(), where the\narch/x86/kvm/xen.c-1793- * only check on its return value is a comparison with -EWOULDBLOCK'.\n--\ninclude/linux/kvm_host.h=1804=int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,\ninclude/linux/kvm_host.h-1805-\t\tint irq_source_id, int level, bool line_status);\ninclude/linux/kvm_host.h:1806:int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,\ninclude/linux/kvm_host.h-1807-\t\t\t struct kvm *kvm, int irq_source_id,\n--\nvirt/kvm/eventfd.c=179=static void irqfd_deactivate(struct kvm_kernel_irqfd *irqfd)\n--\nvirt/kvm/eventfd.c-189-\nvirt/kvm/eventfd.c:190:int __attribute__((weak)) kvm_arch_set_irq_inatomic(\nvirt/kvm/eventfd.c-191-\t\t\t\tstruct kvm_kernel_irq_routing_entry *irq,\n--\nvirt/kvm/eventfd.c=203=irqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void *key)\n--\nvirt/kvm/eventfd.c-235-\t\tif (unlikely(!irqfd_is_active(irqfd)) ||\nvirt/kvm/eventfd.c:236:\t\t kvm_arch_set_irq_inatomic(\u0026irq, kvm,\nvirt/kvm/eventfd.c-237-\t\t\t\t\t KVM_USERSPACE_IRQ_SOURCE_ID, 1,\n"
} |
| 19/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 17408 output: 26 thoughts: 58 Thoughts: Here's my take on the thought process, as if it were my own: **Tracing the Interrupt Flow** Okay, so I'm following the trail of this interrupt injection logic. The function `kvm_arch_set_irq_inatomic` is the target, and it seems like the path to it starts with `irqfd_wakeup`, which is itself triggered by an `eventfd`. That seems straightforward enough to start with. So far, so good: we've established reachability and a triggering mechanism. Now that I have my bearings, let's see how `kvm_s390_inject_vcpu` fits into the picture. Time to dive into the code... |
| 20/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "kvm_s390_inject_vcpu"
}Results: {
"Output": "arch/s390/kvm/intercept.c=303=static int handle_external_interrupt(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-337-\t\tirq.u.extcall.code = vcpu-\u003earch.sie_block-\u003eextcpuaddr;\narch/s390/kvm/intercept.c:338:\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026irq);\narch/s390/kvm/intercept.c-339-\t\t/* ignore if another external call is already pending */\n--\narch/s390/kvm/intercept.c-346-\narch/s390/kvm/intercept.c:347:\treturn kvm_s390_inject_vcpu(vcpu, \u0026irq);\narch/s390/kvm/intercept.c-348-}\n--\narch/s390/kvm/interrupt.c=1453=static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-1458-\tVCPU_EVENT(vcpu, 3, \"inject: program irq code 0x%x\", irq-\u003eu.pgm.code);\narch/s390/kvm/interrupt.c:1459:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_PROGRAM_INT,\narch/s390/kvm/interrupt.c-1460-\t\t\t\t irq-\u003eu.pgm.code, 0);\n--\narch/s390/kvm/interrupt.c=1495=static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-1501-\t\t irq-\u003eu.ext.ext_params2);\narch/s390/kvm/interrupt.c:1502:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_INT_PFAULT_INIT,\narch/s390/kvm/interrupt.c-1503-\t\t\t\t irq-\u003eu.ext.ext_params,\n--\narch/s390/kvm/interrupt.c=1512=static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-1520-\t\t src_id);\narch/s390/kvm/interrupt.c:1521:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_INT_EXTERNAL_CALL,\narch/s390/kvm/interrupt.c-1522-\t\t\t\t src_id, 0);\n--\narch/s390/kvm/interrupt.c=1538=static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-1545-\t\t irq-\u003eu.prefix.address);\narch/s390/kvm/interrupt.c:1546:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_SIGP_SET_PREFIX,\narch/s390/kvm/interrupt.c-1547-\t\t\t\t irq-\u003eu.prefix.address, 0);\n--\narch/s390/kvm/interrupt.c=1558=static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)\n--\narch/s390/kvm/interrupt.c-1563-\tvcpu-\u003estat.inject_stop_signal++;\narch/s390/kvm/interrupt.c:1564:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_SIGP_STOP, 0, 0);\narch/s390/kvm/interrupt.c-1565-\n--\narch/s390/kvm/interrupt.c=1582=static int __inject_sigp_restart(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/interrupt.c-1587-\tVCPU_EVENT(vcpu, 3, \"%s\", \"inject: restart int\");\narch/s390/kvm/interrupt.c:1588:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_RESTART, 0, 0);\narch/s390/kvm/interrupt.c-1589-\n--\narch/s390/kvm/interrupt.c=1594=static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/interrupt.c-1601-\t\t irq-\u003eu.emerg.code);\narch/s390/kvm/interrupt.c:1602:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_INT_EMERGENCY,\narch/s390/kvm/interrupt.c-1603-\t\t\t\t irq-\u003eu.emerg.code, 0);\n--\narch/s390/kvm/interrupt.c=1615=static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-1622-\t\t irq-\u003eu.mchk.mcic);\narch/s390/kvm/interrupt.c:1623:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_MCHK, 0,\narch/s390/kvm/interrupt.c-1624-\t\t\t\t irq-\u003eu.mchk.mcic);\n--\narch/s390/kvm/interrupt.c=1647=static int __inject_ckc(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/interrupt.c-1652-\tVCPU_EVENT(vcpu, 3, \"%s\", \"inject: clock comparator external\");\narch/s390/kvm/interrupt.c:1653:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_INT_CLOCK_COMP,\narch/s390/kvm/interrupt.c-1654-\t\t\t\t 0, 0);\n--\narch/s390/kvm/interrupt.c=1661=static int __inject_cpu_timer(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/interrupt.c-1666-\tVCPU_EVENT(vcpu, 3, \"%s\", \"inject: cpu timer external\");\narch/s390/kvm/interrupt.c:1667:\ttrace_kvm_s390_inject_vcpu(vcpu-\u003evcpu_id, KVM_S390_INT_CPU_TIMER,\narch/s390/kvm/interrupt.c-1668-\t\t\t\t 0, 0);\n--\narch/s390/kvm/interrupt.c=2108=static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)\n--\narch/s390/kvm/interrupt.c-2152-\narch/s390/kvm/interrupt.c:2153:int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\narch/s390/kvm/interrupt.c-2154-{\n--\narch/s390/kvm/interrupt.c=3122=void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/interrupt.c-3157-\t\tirq.type = KVM_S390_MCHK;\narch/s390/kvm/interrupt.c:3158:\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026irq);\narch/s390/kvm/interrupt.c-3159-\t}\n--\narch/s390/kvm/kvm-s390.c=4474=static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,\n--\narch/s390/kvm/kvm-s390.c-4484-\t\tirq.type = KVM_S390_INT_PFAULT_INIT;\narch/s390/kvm/kvm-s390.c:4485:\t\tWARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, \u0026irq));\narch/s390/kvm/kvm-s390.c-4486-\t} else {\n--\narch/s390/kvm/kvm-s390.c=5440=long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n--\narch/s390/kvm/kvm-s390.c-5453-\t\tscoped_guard(srcu, \u0026vcpu-\u003ekvm-\u003esrcu)\narch/s390/kvm/kvm-s390.c:5454:\t\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026s390irq);\narch/s390/kvm/kvm-s390.c-5455-\t\tbreak;\n--\narch/s390/kvm/kvm-s390.c-5467-\t\tscoped_guard(srcu, \u0026vcpu-\u003ekvm-\u003esrcu)\narch/s390/kvm/kvm-s390.c:5468:\t\t\trc = kvm_s390_inject_vcpu(vcpu, \u0026s390irq);\narch/s390/kvm/kvm-s390.c-5469-\t\tbreak;\n--\narch/s390/kvm/kvm-s390.h=378=int __must_check kvm_s390_inject_vm(struct kvm *kvm,\n--\narch/s390/kvm/kvm-s390.h-380-\t\t\t\t struct kvm_s390_interrupt_info *inti);\narch/s390/kvm/kvm-s390.h:381:int __must_check kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.h-382-\t\t\t\t struct kvm_s390_irq *irq);\narch/s390/kvm/kvm-s390.h=383=static inline int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/kvm-s390.h-390-\narch/s390/kvm/kvm-s390.h:391:\treturn kvm_s390_inject_vcpu(vcpu, \u0026irq);\narch/s390/kvm/kvm-s390.h-392-}\narch/s390/kvm/kvm-s390.h=393=static inline int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)\n--\narch/s390/kvm/kvm-s390.h-399-\narch/s390/kvm/kvm-s390.h:400:\treturn kvm_s390_inject_vcpu(vcpu, \u0026irq);\narch/s390/kvm/kvm-s390.h-401-}\n--\narch/s390/kvm/sigp.c=44=static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/sigp.c-52-\narch/s390/kvm/sigp.c:53:\trc = kvm_s390_inject_vcpu(dst_vcpu, \u0026irq);\narch/s390/kvm/sigp.c-54-\tif (!rc)\n--\narch/s390/kvm/sigp.c=93=static int __sigp_external_call(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/sigp.c-101-\narch/s390/kvm/sigp.c:102:\trc = kvm_s390_inject_vcpu(dst_vcpu, \u0026irq);\narch/s390/kvm/sigp.c-103-\tif (rc == -EBUSY) {\n--\narch/s390/kvm/sigp.c=115=static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)\n--\narch/s390/kvm/sigp.c-121-\narch/s390/kvm/sigp.c:122:\trc = kvm_s390_inject_vcpu(dst_vcpu, \u0026irq);\narch/s390/kvm/sigp.c-123-\tif (rc == -EBUSY)\n--\narch/s390/kvm/sigp.c=132=static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/sigp.c-140-\narch/s390/kvm/sigp.c:141:\trc = kvm_s390_inject_vcpu(dst_vcpu, \u0026irq);\narch/s390/kvm/sigp.c-142-\tif (rc == -EBUSY)\n--\narch/s390/kvm/sigp.c=161=static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,\n--\narch/s390/kvm/sigp.c-180-\narch/s390/kvm/sigp.c:181:\trc = kvm_s390_inject_vcpu(dst_vcpu, \u0026irq);\narch/s390/kvm/sigp.c-182-\tif (rc == -EBUSY) {\n--\narch/s390/kvm/trace-s390.h=125=TRACE_EVENT(kvm_s390_inject_vm,\n--\narch/s390/kvm/trace-s390.h-149-\narch/s390/kvm/trace-s390.h:150:TRACE_EVENT(kvm_s390_inject_vcpu,\narch/s390/kvm/trace-s390.h-151-\t TP_PROTO(unsigned int id, __u64 type, __u32 parm, __u64 parm64),\n"
} |
| 21/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 21849 output: 28 thoughts: 182 Thoughts: **Focusing on Key KVM/s390 Symbols** Okay, let's see. I've been reviewing the code and these symbols are standing out as particularly interesting for further investigation: `kvm_s390_inject_vcpu`, seems promising. `kvm_s390_set_irq_state` also has potential, and I'll keep that in mind. And let's not forget `dat_cond_set_storage_key`; definitely needs a closer look, especially how it interacts with storage keys. `kvm_arch_set_irq_inatomic` is worth consideration as well. Also, `kvm_s390_pv_set_aside` seems like another focal point for analysis. Hold on a second, something just pinged. I see that `kvm_s390_clear_pv_state` is declared `static` and that it's called from both `kvm_s390_pv_dealloc_vm` and `kvm_s390_pv_set_aside`. Since it's being called from both, let's see how `kvm_s390_pv_dealloc_vm` handles it. I'll need to dig into that now to understand the full flow. |
| 22/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "kvm_s390_pv_dealloc_vm"
}Results: {
"Output": "arch/s390/kvm/pv.c=288=int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-342-/* only free resources when the destroy was successful */\narch/s390/kvm/pv.c:343:static void kvm_s390_pv_dealloc_vm(struct kvm *kvm)\narch/s390/kvm/pv.c-344-{\n--\narch/s390/kvm/pv.c=351=static int kvm_s390_pv_alloc_vm(struct kvm *kvm)\n--\narch/s390/kvm/pv.c-382-out_err:\narch/s390/kvm/pv.c:383:\tkvm_s390_pv_dealloc_vm(kvm);\narch/s390/kvm/pv.c-384-\treturn -ENOMEM;\n--\narch/s390/kvm/pv.c=428=static int kvm_s390_pv_deinit_vm_fast(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-448-\tif (!cc)\narch/s390/kvm/pv.c:449:\t\tkvm_s390_pv_dealloc_vm(kvm);\narch/s390/kvm/pv.c-450-\treturn cc ? -EIO : 0;\n--\narch/s390/kvm/pv.c=541=int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-548-\t\tatomic_dec(\u0026kvm-\u003emm-\u003econtext.protected_count);\narch/s390/kvm/pv.c:549:\t\tkvm_s390_pv_dealloc_vm(kvm);\narch/s390/kvm/pv.c-550-\t} else {\n--\narch/s390/kvm/pv.c=713=int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-768-\t\t\tatomic_dec(\u0026kvm-\u003emm-\u003econtext.protected_count);\narch/s390/kvm/pv.c:769:\t\t\tkvm_s390_pv_dealloc_vm(kvm);\narch/s390/kvm/pv.c-770-\t\t}\n--\narch/s390/kvm/pv.c=1028=int kvm_s390_pv_dump_complete(struct kvm *kvm, void __user *buff_user,\n--\narch/s390/kvm/pv.c-1052-\t\t/*\narch/s390/kvm/pv.c:1053:\t\t * kvm_s390_pv_dealloc_vm() will also (mem)set\narch/s390/kvm/pv.c-1054-\t\t * this to false on a reboot or other destroy\n"
} |
| 23/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 23252 output: 28 thoughts: 62 Thoughts: Here's my summary, as though I'm thinking through this process: **Diving into KVM/s390x PV VM Initialization/Deinitialization** Okay, so I'm digging into the KVM/s390x virtualization code again. The first thing I need to confirm is that both `kvm_s390_pv_deinit_vm` and `kvm_s390_pv_init_vm` are exposed, either directly through an export symbol or, more likely, indirectly via an ioctl. Knowing how they're exposed is key to understanding how they're called and utilized within the wider system. I suspect they're ioctl entrypoints, given the nature of managing a virtual machine's lifecycle at the hypervisor level. Let's start by focusing on `kvm_s390_pv_deinit_vm`. Deinitialization is often a good entry point; it'll likely hold the cleanup logic that's necessary when a virtual machine is shutting down or being freed. I'll need to trace its usage, see what data structures it operates on, and understand the implications of a successful or failed deinitialization. This initial exploration should provide a solid foundation for understanding the initialization process as well, as they are likely closely related. |
| 24/2 | 2026/08/12 10:57 | tool | grepper |
0mArgs:{
"Expression": "kvm_s390_pv_deinit_vm"
}Results: {
"Output": "arch/s390/kvm/kvm-s390.c=2580=static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)\n--\narch/s390/kvm/kvm-s390.c-2615-\t\tif (r)\narch/s390/kvm/kvm-s390.c:2616:\t\t\tkvm_s390_pv_deinit_vm(kvm, \u0026dummy, \u0026dummy);\narch/s390/kvm/kvm-s390.c-2617-\n--\narch/s390/kvm/kvm-s390.h=309=int kvm_s390_pv_deinit_cleanup_all(struct kvm *kvm, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h:310:int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h-311-int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc);\n--\narch/s390/kvm/pv.c=400=static int kvm_s390_pv_dispose_one_leftover(struct kvm *kvm,\n--\narch/s390/kvm/pv.c-427-\narch/s390/kvm/pv.c:428:static int kvm_s390_pv_deinit_vm_fast(struct kvm *kvm, u16 *rc, u16 *rrc)\narch/s390/kvm/pv.c-429-{\n--\narch/s390/kvm/pv.c=476=int kvm_s390_pv_set_aside(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-497-\tif (is_destroy_fast_available()) {\narch/s390/kvm/pv.c:498:\t\tres = kvm_s390_pv_deinit_vm_fast(kvm, rc, rrc);\narch/s390/kvm/pv.c-499-\t} else {\n--\narch/s390/kvm/pv.c-522-/**\narch/s390/kvm/pv.c:523: * kvm_s390_pv_deinit_vm - Deinitialize the current protected VM\narch/s390/kvm/pv.c-524- * @kvm: the KVM whose protected VM needs to be deinitialized\n--\narch/s390/kvm/pv.c-540- */\narch/s390/kvm/pv.c:541:int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc)\narch/s390/kvm/pv.c-542-{\n--\narch/s390/kvm/pv.c=576=int kvm_s390_pv_deinit_cleanup_all(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-592-\tif (kvm_s390_pv_get_handle(kvm)) {\narch/s390/kvm/pv.c:593:\t\tcc = kvm_s390_pv_deinit_vm(kvm, rc, rrc);\narch/s390/kvm/pv.c-594-\t\tneed_zap = true;\n--\narch/s390/kvm/pv.c=689=static void kvm_s390_pv_mmu_notifier_release(struct mmu_notifier *subscription,\n--\narch/s390/kvm/pv.c-704-\tif (!r \u0026\u0026 is_destroy_fast_available() \u0026\u0026 kvm_s390_pv_get_handle(kvm))\narch/s390/kvm/pv.c:705:\t\tkvm_s390_pv_deinit_vm_fast(kvm, \u0026dummy, \u0026dummy);\narch/s390/kvm/pv.c-706-\tset_bit(GMAP_FLAG_EXPORT_ON_UNMAP, \u0026kvm-\u003earch.gmap-\u003eflags);\n--\narch/s390/kvm/pv.c=713=int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-765-\t\tif (uvcb.header.rc \u0026 UVC_RC_NEED_DESTROY) {\narch/s390/kvm/pv.c:766:\t\t\tkvm_s390_pv_deinit_vm(kvm, \u0026dummy, \u0026dummy);\narch/s390/kvm/pv.c-767-\t\t} else {\n"
} |
| 25/2 | 2026/08/12 10:57 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25015 output: 17 thoughts: 268 Thoughts: **My Current Investigative Path** Okay, let's see. My initial thought is that `kvm_s390_pv_deinit_vm`, `kvm_s390_pv_init_vm`, and `kvm_s390_pv_set_aside` are strong candidates for further investigation. These likely represent key aspects of the virtual machine lifecycle within the s390 architecture. They warrant a closer look to understand the underlying mechanisms. Next, I'm drawn to `kvm_s390_set_irq_state`. The fact that it's called from `kvm_arch_vcpu_ioctl` specifically for `KVM_S390_SET_IRQ_STATE` tells me it's central to how interrupts are managed within the KVM environment on s390. This is definitely a critical control point to understand, especially regarding interrupt injection and handling. Now, let's shift gears to `dat_cond_set_storage_key`. The fact that it's invoked from `kvm_s390_keyop`, `handle_sske`, and `handle_pfmf` strongly suggests it's intimately involved with storage key manipulation and potential security implications. This is an area I need to understand thoroughly, as it relates to memory access control. Finally, I'll turn my attention to `_gaccess_do_shadow`. Although it's a static function, its relationship to `___gaccess_shadow_fault` and, importantly, its use within `guest_translate` and `check_gva_range` is significant. The use of `guest_translate` is a core function for memory address translation, so understanding this interaction is going to be vital to understanding how KVM handles memory access within the guest. |
| 26/2 | 2026/08/12 10:58 | tool | grepper |
0mArgs:{
"Expression": "guest_translate"
}Results: {
"Output": "arch/s390/kvm/gaccess.c=444=static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val)\n--\narch/s390/kvm/gaccess.c-449-/**\narch/s390/kvm/gaccess.c:450: * guest_translate_gva() - translate a guest virtual into a guest absolute address\narch/s390/kvm/gaccess.c-451- * @vcpu: virtual cpu\n--\narch/s390/kvm/gaccess.c-469- */\narch/s390/kvm/gaccess.c:470:static unsigned long guest_translate_gva(struct kvm_vcpu *vcpu, unsigned long gva,\narch/s390/kvm/gaccess.c-471-\t\t\t\t\t unsigned long *gpa, const union asce asce,\n--\narch/s390/kvm/gaccess.c=774=static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,\n--\narch/s390/kvm/gaccess.c-793-\t\tif (psw_bits(*psw).dat) {\narch/s390/kvm/gaccess.c:794:\t\t\trc = guest_translate_gva(vcpu, ga, \u0026gpa, asce, mode, \u0026prot);\narch/s390/kvm/gaccess.c-795-\t\t\tif (rc \u003c 0)\n--\narch/s390/kvm/gaccess.c=1137=int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len, union kvm_s390_quad *old,\n--\narch/s390/kvm/gaccess.c-1169-/**\narch/s390/kvm/gaccess.c:1170: * guest_translate_address_with_key - translate guest logical into guest absolute address\narch/s390/kvm/gaccess.c-1171- * @vcpu: virtual cpu\n--\narch/s390/kvm/gaccess.c-1177- *\narch/s390/kvm/gaccess.c:1178: * Parameter semantics are the same as the ones from guest_translate.\narch/s390/kvm/gaccess.c-1179- * The memory contents at the guest address are not changed.\n--\narch/s390/kvm/gaccess.c-1183- */\narch/s390/kvm/gaccess.c:1184:int guest_translate_address_with_key(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,\narch/s390/kvm/gaccess.c-1185-\t\t\t\t unsigned long *gpa, enum gacc_mode mode,\n--\narch/s390/kvm/gaccess.h=183=enum gacc_mode {\n--\narch/s390/kvm/gaccess.h-188-\narch/s390/kvm/gaccess.h:189:int guest_translate_address_with_key(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,\narch/s390/kvm/gaccess.h-190-\t\t\t\t unsigned long *gpa, enum gacc_mode mode,\n--\narch/s390/kvm/intercept.c=359=static int handle_mvpg_pei(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-366-\t/* Ensure that the source is paged-in, no actual access -\u003e no key checking */\narch/s390/kvm/intercept.c:367:\trc = guest_translate_address_with_key(vcpu, vcpu-\u003erun-\u003es.regs.gprs[reg2],\narch/s390/kvm/intercept.c-368-\t\t\t\t\t reg2, \u0026srcaddr, GACC_FETCH, 0);\n--\narch/s390/kvm/intercept.c-378-\t/* Ensure that the source is paged-in, no actual access -\u003e no key checking */\narch/s390/kvm/intercept.c:379:\trc = guest_translate_address_with_key(vcpu, vcpu-\u003erun-\u003es.regs.gprs[reg1],\narch/s390/kvm/intercept.c-380-\t\t\t\t\t reg1, \u0026dstaddr, GACC_STORE, 0);\n--\narch/s390/kvm/priv.c=1465=static int handle_tprot(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1484-\narch/s390/kvm/priv.c:1485:\tret = guest_translate_address_with_key(vcpu, address, ar, \u0026gpa,\narch/s390/kvm/priv.c-1486-\t\t\t\t\t GACC_STORE, access_key);\n--\narch/s390/kvm/priv.c-1491-\t\t/* Write protected? Try again with read-only... */\narch/s390/kvm/priv.c:1492:\t\tret = guest_translate_address_with_key(vcpu, address, ar, \u0026gpa,\narch/s390/kvm/priv.c-1493-\t\t\t\t\t\t GACC_FETCH, access_key);\n"
} |
| 27/2 | 2026/08/12 10:58 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 27134 output: 17 thoughts: 284 Thoughts: **My Current Analysis of Relevant KVM s390x Symbols** Okay, so `guest_translate_address_with_key` is a really solid starting point; that feels right. Let's dig deeper into the interconnected pieces. I need to confirm the static nature of `__inject_sigp_stop`. Yep, it's static, which means `kvm_s390_inject_vcpu` is the externally accessible entry point that calls it. Good. I'll make a mental note of that relationship. Now, let's look at `adapter_indicators_set`. It's also static. I see `kvm_set_routing_entry` is exported, but it seems to be a generic KVM function, not specific to the s390 architecture. Ah, the s390-specific one is actually `kvm_arch_set_irq_inatomic`. Okay, that clarifies things. Alright, so putting it all together, the most relevant focus symbols, the ones I need to really pay attention to are: - `dat_cond_set_storage_key` - `kvm_s390_inject_vcpu` - `kvm_s390_set_irq_state` - `kvm_arch_set_irq_inatomic` - `kvm_s390_pv_deinit_vm` - `kvm_s390_pv_init_vm` - `kvm_s390_pv_set_aside` - `guest_translate_address_with_key` Time to check for any specific kernel configurations. `CONFIG_KVM` is, of course, absolutely required. I should scan for any other configurations that are pertinent, as well. |
| 28/2 | 2026/08/12 10:58 | tool | grepper |
0mArgs:{
"Expression": "config KVM"
}Results: {
"Output": "arch/arm64/kvm/Kconfig=18=if VIRTUALIZATION\narch/arm64/kvm/Kconfig-19-\narch/arm64/kvm/Kconfig:20:menuconfig KVM\narch/arm64/kvm/Kconfig-21-\tbool \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/loongarch/kvm/Kconfig=18=if VIRTUALIZATION\narch/loongarch/kvm/Kconfig-19-\narch/loongarch/kvm/Kconfig:20:config KVM\narch/loongarch/kvm/Kconfig-21-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/mips/kvm/Kconfig=16=if VIRTUALIZATION\narch/mips/kvm/Kconfig-17-\narch/mips/kvm/Kconfig:18:config KVM\narch/mips/kvm/Kconfig-19-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/mips/kvm/Kconfig-30-\narch/mips/kvm/Kconfig:31:config KVM_MIPS_DEBUG_COP0_COUNTERS\narch/mips/kvm/Kconfig-32-\tbool \"Maintain counters for COP0 accesses\"\n--\narch/powerpc/kvm/Kconfig=18=if VIRTUALIZATION\narch/powerpc/kvm/Kconfig-19-\narch/powerpc/kvm/Kconfig:20:config KVM\narch/powerpc/kvm/Kconfig-21-\tbool\n--\narch/powerpc/kvm/Kconfig-25-\narch/powerpc/kvm/Kconfig:26:config KVM_BOOK3S_HANDLER\narch/powerpc/kvm/Kconfig-27-\tbool\narch/powerpc/kvm/Kconfig-28-\narch/powerpc/kvm/Kconfig:29:config KVM_BOOK3S_32_HANDLER\narch/powerpc/kvm/Kconfig-30-\tbool\n--\narch/powerpc/kvm/Kconfig-33-\narch/powerpc/kvm/Kconfig:34:config KVM_BOOK3S_64_HANDLER\narch/powerpc/kvm/Kconfig-35-\tbool\n--\narch/powerpc/kvm/Kconfig-37-\narch/powerpc/kvm/Kconfig:38:config KVM_BOOK3S_PR_POSSIBLE\narch/powerpc/kvm/Kconfig-39-\tbool\n--\narch/powerpc/kvm/Kconfig-41-\narch/powerpc/kvm/Kconfig:42:config KVM_BOOK3S_HV_POSSIBLE\narch/powerpc/kvm/Kconfig-43-\tbool\narch/powerpc/kvm/Kconfig-44-\narch/powerpc/kvm/Kconfig:45:config KVM_BOOK3S_32\narch/powerpc/kvm/Kconfig-46-\ttristate \"KVM support for PowerPC book3s_32 processors\"\n--\narch/powerpc/kvm/Kconfig-61-\narch/powerpc/kvm/Kconfig:62:config KVM_BOOK3S_64\narch/powerpc/kvm/Kconfig-63-\ttristate \"KVM support for PowerPC book3s_64 processors\"\n--\narch/powerpc/kvm/Kconfig-78-\narch/powerpc/kvm/Kconfig:79:config KVM_BOOK3S_64_HV\narch/powerpc/kvm/Kconfig-80-\ttristate \"KVM for POWER7 and later using hypervisor mode in host\"\n--\narch/powerpc/kvm/Kconfig-99-\narch/powerpc/kvm/Kconfig:100:config KVM_BOOK3S_64_PR\narch/powerpc/kvm/Kconfig-101-\ttristate \"KVM support without using hypervisor mode in host\"\n--\narch/powerpc/kvm/Kconfig-125-\narch/powerpc/kvm/Kconfig:126:config KVM_BOOK3S_HV_EXIT_TIMING\narch/powerpc/kvm/Kconfig-127-\tbool\narch/powerpc/kvm/Kconfig-128-\narch/powerpc/kvm/Kconfig:129:config KVM_BOOK3S_HV_P9_TIMING\narch/powerpc/kvm/Kconfig-130-\tbool \"Detailed timing for the P9 entry point\"\n--\narch/powerpc/kvm/Kconfig-141-\narch/powerpc/kvm/Kconfig:142:config KVM_BOOK3S_HV_P8_TIMING\narch/powerpc/kvm/Kconfig-143-\tbool \"Detailed timing for hypervisor real-mode code (for POWER8)\"\n--\narch/powerpc/kvm/Kconfig-156-\narch/powerpc/kvm/Kconfig:157:config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND\narch/powerpc/kvm/Kconfig-158-\tbool \"Nested L0 host workaround for L1 KVM host PMU handling bug\" if EXPERT\n--\narch/powerpc/kvm/Kconfig-171-\narch/powerpc/kvm/Kconfig:172:config KVM_BOOK3S_HV_PMU\narch/powerpc/kvm/Kconfig-173-\ttristate \"Hypervisor Perf events for KVM Book3s-HV\"\n--\narch/powerpc/kvm/Kconfig-183-\narch/powerpc/kvm/Kconfig:184:config KVM_BOOKE_HV\narch/powerpc/kvm/Kconfig-185-\tbool\narch/powerpc/kvm/Kconfig-186-\narch/powerpc/kvm/Kconfig:187:config KVM_EXIT_TIMING\narch/powerpc/kvm/Kconfig-188-\tbool \"Detailed exit timing\"\n--\narch/powerpc/kvm/Kconfig-197-\narch/powerpc/kvm/Kconfig:198:config KVM_E500V2\narch/powerpc/kvm/Kconfig-199-\tbool \"KVM support for PowerPC E500v2 processors\"\n--\narch/powerpc/kvm/Kconfig-212-\narch/powerpc/kvm/Kconfig:213:config KVM_E500MC\narch/powerpc/kvm/Kconfig-214-\tbool \"KVM support for PowerPC E500MC/E5500/E6500 processors\"\n--\narch/powerpc/kvm/Kconfig-228-\narch/powerpc/kvm/Kconfig:229:config KVM_MPIC\narch/powerpc/kvm/Kconfig-230-\tbool \"KVM in-kernel MPIC emulation\"\n--\narch/powerpc/kvm/Kconfig-240-\narch/powerpc/kvm/Kconfig:241:config KVM_XICS\narch/powerpc/kvm/Kconfig-242-\tbool \"KVM in-kernel XICS emulation\"\n--\narch/powerpc/kvm/Kconfig-250-\narch/powerpc/kvm/Kconfig:251:config KVM_XIVE\narch/powerpc/kvm/Kconfig-252-\tbool\n--\narch/powerpc/platforms/Kconfig=22=source \"arch/powerpc/platforms/microwatt/Kconfig\"\narch/powerpc/platforms/Kconfig-23-\narch/powerpc/platforms/Kconfig:24:config KVM_GUEST\narch/powerpc/platforms/Kconfig-25-\tbool \"KVM Guest support\"\n--\narch/riscv/kvm/Kconfig=18=if VIRTUALIZATION\narch/riscv/kvm/Kconfig-19-\narch/riscv/kvm/Kconfig:20:config KVM\narch/riscv/kvm/Kconfig-21-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/s390/kvm/Kconfig=17=if VIRTUALIZATION\narch/s390/kvm/Kconfig-18-\narch/s390/kvm/Kconfig:19:config KVM\narch/s390/kvm/Kconfig-20-\tdef_tristate y\n--\narch/s390/kvm/Kconfig-46-\narch/s390/kvm/Kconfig:47:config KVM_S390_UCONTROL\narch/s390/kvm/Kconfig-48-\tbool \"Userspace controlled virtual machines\"\n--\narch/x86/Kconfig=826=source \"arch/x86/xen/Kconfig\"\narch/x86/Kconfig-827-\narch/x86/Kconfig:828:config KVM_GUEST\narch/x86/Kconfig-829-\tbool \"KVM Guest support (including kvmclock)\"\n--\narch/x86/kvm/Kconfig=18=if VIRTUALIZATION\narch/x86/kvm/Kconfig-19-\narch/x86/kvm/Kconfig:20:config KVM_X86\narch/x86/kvm/Kconfig-21-\tdef_tristate KVM if (KVM_INTEL != n || KVM_AMD != n)\n--\narch/x86/kvm/Kconfig-51-\narch/x86/kvm/Kconfig:52:config KVM\narch/x86/kvm/Kconfig-53-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/x86/kvm/Kconfig-68-\narch/x86/kvm/Kconfig:69:config KVM_WERROR\narch/x86/kvm/Kconfig-70-\tbool \"Compile KVM with -Werror\"\n--\narch/x86/kvm/Kconfig-82-\narch/x86/kvm/Kconfig:83:config KVM_SW_PROTECTED_VM\narch/x86/kvm/Kconfig-84-\tbool \"Enable support for KVM software-protected VMs\"\n--\narch/x86/kvm/Kconfig-95-\narch/x86/kvm/Kconfig:96:config KVM_INTEL\narch/x86/kvm/Kconfig-97-\ttristate \"KVM for Intel (and compatible) processors support\"\n--\narch/x86/kvm/Kconfig-106-\narch/x86/kvm/Kconfig:107:config KVM_INTEL_PROVE_VE\narch/x86/kvm/Kconfig-108- bool \"Check that guests do not receive #VE exceptions\"\n--\narch/x86/kvm/Kconfig=122=config X86_SGX_KVM\n--\narch/x86/kvm/Kconfig-133-\narch/x86/kvm/Kconfig:134:config KVM_INTEL_TDX\narch/x86/kvm/Kconfig-135-\tbool \"Intel Trust Domain Extensions (TDX) support\"\n--\narch/x86/kvm/Kconfig-145-\narch/x86/kvm/Kconfig:146:config KVM_AMD\narch/x86/kvm/Kconfig-147-\ttristate \"KVM for AMD processors support\"\n--\narch/x86/kvm/Kconfig-155-\narch/x86/kvm/Kconfig:156:config KVM_AMD_SEV\narch/x86/kvm/Kconfig-157-\tbool \"AMD Secure Encrypted Virtualization (SEV) support\"\n--\narch/x86/kvm/Kconfig-171-\narch/x86/kvm/Kconfig:172:config KVM_IOAPIC\narch/x86/kvm/Kconfig-173-\tbool \"I/O APIC, PIC, and PIT emulation\"\n--\narch/x86/kvm/Kconfig-181-\narch/x86/kvm/Kconfig:182:config KVM_SMM\narch/x86/kvm/Kconfig-183-\tbool \"System Management Mode emulation\"\n--\narch/x86/kvm/Kconfig-192-\narch/x86/kvm/Kconfig:193:config KVM_HYPERV\narch/x86/kvm/Kconfig-194-\tbool \"Support for Microsoft Hyper-V emulation\"\n--\narch/x86/kvm/Kconfig-206-\narch/x86/kvm/Kconfig:207:config KVM_XEN\narch/x86/kvm/Kconfig-208-\tbool \"Support for Xen hypercall interface\"\n--\narch/x86/kvm/Kconfig-215-\narch/x86/kvm/Kconfig:216:config KVM_PROVE_MMU\narch/x86/kvm/Kconfig-217-\tbool \"Prove KVM MMU correctness\"\n--\narch/x86/kvm/Kconfig-228-\narch/x86/kvm/Kconfig:229:config KVM_EXTERNAL_WRITE_TRACKING\narch/x86/kvm/Kconfig-230-\tbool\narch/x86/kvm/Kconfig-231-\narch/x86/kvm/Kconfig:232:config KVM_MAX_NR_VCPUS\narch/x86/kvm/Kconfig-233-\tint \"Maximum number of vCPUs per KVM guest\"\n--\nvirt/kvm/Kconfig-3-\nvirt/kvm/Kconfig:4:config KVM_COMMON\nvirt/kvm/Kconfig-5- bool\n--\nvirt/kvm/Kconfig=39=config NEED_KVM_DIRTY_RING_WITH_BITMAP\n--\nvirt/kvm/Kconfig-42-\nvirt/kvm/Kconfig:43:config KVM_MMIO\nvirt/kvm/Kconfig-44- bool\nvirt/kvm/Kconfig-45-\nvirt/kvm/Kconfig:46:config KVM_ASYNC_PF\nvirt/kvm/Kconfig-47- bool\n--\nvirt/kvm/Kconfig-49-# Toggle to switch between direct notification and batch job\nvirt/kvm/Kconfig:50:config KVM_ASYNC_PF_SYNC\nvirt/kvm/Kconfig-51- bool\n--\nvirt/kvm/Kconfig=59=config HAVE_KVM_CPU_RELAX_INTERCEPT\n--\nvirt/kvm/Kconfig-61-\nvirt/kvm/Kconfig:62:config KVM_VFIO\nvirt/kvm/Kconfig-63- bool\n--\nvirt/kvm/Kconfig=65=config HAVE_KVM_INVALID_WAKEUPS\n--\nvirt/kvm/Kconfig-67-\nvirt/kvm/Kconfig:68:config KVM_GENERIC_DIRTYLOG_READ_PROTECT\nvirt/kvm/Kconfig-69- bool\nvirt/kvm/Kconfig-70-\nvirt/kvm/Kconfig:71:config KVM_GENERIC_PRE_FAULT_MEMORY\nvirt/kvm/Kconfig-72- bool\nvirt/kvm/Kconfig-73-\nvirt/kvm/Kconfig:74:config KVM_COMPAT\nvirt/kvm/Kconfig-75- def_bool y\n--\nvirt/kvm/Kconfig=91=config HAVE_KVM_PM_NOTIFIER\n--\nvirt/kvm/Kconfig-93-\nvirt/kvm/Kconfig:94:config KVM_GENERIC_HARDWARE_ENABLING\nvirt/kvm/Kconfig-95- bool\nvirt/kvm/Kconfig-96-\nvirt/kvm/Kconfig:97:config KVM_ELIDE_TLB_FLUSH_IF_YOUNG\nvirt/kvm/Kconfig-98- bool\nvirt/kvm/Kconfig-99-\nvirt/kvm/Kconfig:100:config KVM_MMU_LOCKLESS_AGING\nvirt/kvm/Kconfig-101- bool\nvirt/kvm/Kconfig-102-\nvirt/kvm/Kconfig:103:config KVM_GENERIC_MEMORY_ATTRIBUTES\nvirt/kvm/Kconfig-104- bool\nvirt/kvm/Kconfig-105-\nvirt/kvm/Kconfig:106:config KVM_GUEST_MEMFD\nvirt/kvm/Kconfig-107- select XARRAY_MULTI\n"
} |
| 29/2 | 2026/08/12 10:58 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32120 output: 25 thoughts: 47 Thoughts: **Analyzing the KVM Configuration** Okay, so I'm looking at this patch and immediately, `KVM` jumps out as the primary configuration element. That's the first thing that catches my eye. Now, I have to consider: is there anything else relevant in the configuration? Are there other settings or dependencies I need to be aware of beyond the obvious `KVM` selection? Then I notice the patch itself touches `arch/s390/kvm/pv.c`. Ah, that's interesting. It looks like it deals with `PV` which is Protected Virtualization. Therefore, I need to check if there's a specific configuration option for Protected Virtualization itself. I'll need to dig into the configuration files to see if `PV` has its own setting alongside `KVM`, or if it's implicitly enabled somehow under the broader `KVM` umbrella. |
| 30/2 | 2026/08/12 10:58 | tool | grepper |
0mArgs:{
"Expression": "config KVM_S390_UCONTROL"
}Results: {
"Output": "arch/s390/kvm/Kconfig=19=config KVM\n--\narch/s390/kvm/Kconfig-46-\narch/s390/kvm/Kconfig:47:config KVM_S390_UCONTROL\narch/s390/kvm/Kconfig-48-\tbool \"Userspace controlled virtual machines\"\n"
} |
| 31/2 | 2026/08/12 10:58 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 32486 output: 17 thoughts: 17 Thoughts: Okay, here's my summarized thought process, presented as if I were thinking it: **Checking PV Configuration on s390** Alright, let's get down to brass tacks. My initial thought is to investigate whether there's any pre-existing configuration, documentation, or established practices related to persistent volumes (PVs) within the s390 architecture. This is a crucial first step. I need to understand if this is something that's been addressed before, or if I'm venturing into somewhat uncharted territory. My primary goal here is to establish a baseline. Are there existing best practices? Any known pitfalls? Any specific considerations unique to the s390 platform that I need to be aware of from the get go? The "s390" element is key here. It will likely shape any storage configurations, drivers, and overall strategy that might be applicable. I need to be sure that the configuration is going to be compatible with this architecture. |
| 32/2 | 2026/08/12 10:58 | tool | grepper |
0mArgs:{
"Expression": "config .*PV"
}Results: {
"Output": "Documentation/networking/ipvlan.rst=16=outside of it.\n--\nDocumentation/networking/ipvlan.rst-21-\nDocumentation/networking/ipvlan.rst:22:In order to build the driver, please select the config item CONFIG_IPVLAN.\nDocumentation/networking/ipvlan.rst-23-The driver can be built into the kernel (CONFIG_IPVLAN=y) or as a module\n--\narch/Kconfig=1065=config HAVE_IRQ_TIME_ACCOUNTING\n--\narch/Kconfig-1070-\narch/Kconfig:1071:config HAVE_PV_STEAL_CLOCK_GEN\narch/Kconfig-1072-\tbool\n--\narch/arm/Kconfig.debug=1413=config DEBUG_S3C64XX_UART\n--\narch/arm/Kconfig.debug-1415-\narch/arm/Kconfig.debug:1416:config DEBUG_S5PV210_UART\narch/arm/Kconfig.debug-1417-\tbool\n--\narch/arm/mach-s5pv210/Kconfig-7-\narch/arm/mach-s5pv210/Kconfig:8:config ARCH_S5PV210\narch/arm/mach-s5pv210/Kconfig-9-\tbool \"Samsung S5PV210/S5PC110\"\n--\narch/arm/mach-s5pv210/Kconfig=21=if ARCH_S5PV210\narch/arm/mach-s5pv210/Kconfig-22-\narch/arm/mach-s5pv210/Kconfig:23:config CPU_S5PV210\narch/arm/mach-s5pv210/Kconfig-24-\tdef_bool y\n--\narch/arm/mm/Kconfig=663=config ARM_LPAE\n--\narch/arm/mm/Kconfig-676-\narch/arm/mm/Kconfig:677:config ARM_PV_FIXUP\narch/arm/mm/Kconfig-678-\tdef_bool y\n--\narch/microblaze/include/asm/pvr.h=15=struct pvr_s {\n--\narch/microblaze/include/asm/pvr.h-76-\narch/microblaze/include/asm/pvr.h:77:/* ICache config PVR masks */\narch/microblaze/include/asm/pvr.h-78-#define PVR4_USE_ICACHE_MASK\t\t0x80000000 /* ICU */\n--\narch/microblaze/include/asm/pvr.h-85-\narch/microblaze/include/asm/pvr.h:86:/* DCache config PVR masks */\narch/microblaze/include/asm/pvr.h-87-#define PVR5_USE_DCACHE_MASK\t\t0x80000000 /* DCU */\n--\narch/sh/drivers/dma/Kconfig=45=config SH_DMABRG\n--\narch/sh/drivers/dma/Kconfig-52-\narch/sh/drivers/dma/Kconfig:53:config PVR2_DMA\narch/sh/drivers/dma/Kconfig-54-\ttristate \"PowerVR 2 DMAC support\"\n--\narch/x86/Kconfig=842=config ARCH_CPUIDLE_HALTPOLL\n--\narch/x86/Kconfig-847-\narch/x86/Kconfig:848:config PVH\narch/x86/Kconfig-849-\tbool \"Support for running PVH guests\"\n--\narch/x86/Kconfig.cpufeatures=177=config X86_DISABLED_FEATURE_SGX\n--\narch/x86/Kconfig.cpufeatures-180-\narch/x86/Kconfig.cpufeatures:181:config X86_DISABLED_FEATURE_XENPV\narch/x86/Kconfig.cpufeatures-182-\tdef_bool y\n--\narch/x86/xen/Kconfig=6=config XEN\n--\narch/x86/xen/Kconfig-19-\narch/x86/xen/Kconfig:20:config XEN_PV\narch/x86/xen/Kconfig-21-\tbool \"Xen PV guest support\"\n--\narch/x86/xen/Kconfig=32=config XEN_512GB\n--\narch/x86/xen/Kconfig-44-\narch/x86/xen/Kconfig:45:config XEN_PV_SMP\narch/x86/xen/Kconfig-46-\tdef_bool y\n--\narch/x86/xen/Kconfig-48-\narch/x86/xen/Kconfig:49:config XEN_PV_DOM0\narch/x86/xen/Kconfig-50-\tdef_bool y\n--\narch/x86/xen/Kconfig-52-\narch/x86/xen/Kconfig:53:config XEN_PVHVM\narch/x86/xen/Kconfig-54-\tdef_bool y\n--\narch/x86/xen/Kconfig-56-\narch/x86/xen/Kconfig:57:config XEN_PVHVM_SMP\narch/x86/xen/Kconfig-58-\tdef_bool y\n--\narch/x86/xen/Kconfig-60-\narch/x86/xen/Kconfig:61:config XEN_PVHVM_GUEST\narch/x86/xen/Kconfig-62-\tbool \"Xen PVHVM guest support\"\n--\narch/x86/xen/Kconfig-67-\narch/x86/xen/Kconfig:68:config XEN_PVH\narch/x86/xen/Kconfig-69-\tbool \"Xen PVH guest support\"\n--\narch/x86/xen/Kconfig=75=config XEN_DOM0\n--\narch/x86/xen/Kconfig-83-\narch/x86/xen/Kconfig:84:config XEN_PV_MSR_SAFE\narch/x86/xen/Kconfig-85-\tbool \"Always use safe MSR accesses in PV guests\"\n--\ndrivers/clk/samsung/Kconfig=17=config S3C64XX_COMMON_CLK\n--\ndrivers/clk/samsung/Kconfig-23-\ndrivers/clk/samsung/Kconfig:24:config S5PV210_COMMON_CLK\ndrivers/clk/samsung/Kconfig-25-\tbool \"Samsung S5Pv210 clock controller support\" if COMPILE_TEST\n--\ndrivers/cpufreq/Kconfig.arm=175=config ARM_S3C64XX_CPUFREQ\n--\ndrivers/cpufreq/Kconfig.arm-183-\ndrivers/cpufreq/Kconfig.arm:184:config ARM_S5PV210_CPUFREQ\ndrivers/cpufreq/Kconfig.arm-185-\tbool \"Samsung S5PV210 and S5PC110\"\n--\ndrivers/gpib/Kconfig=201=config GPIB_PCMCIA\n--\ndrivers/gpib/Kconfig-207-\ndrivers/gpib/Kconfig:208:config GPIB_LPVO\ndrivers/gpib/Kconfig-209- tristate \"LPVO DIY USB GPIB\"\n--\ndrivers/gpu/drm/bridge/imx/Kconfig=36=config DRM_IMX8MP_HDMI_PAI\n--\ndrivers/gpu/drm/bridge/imx/Kconfig-45-\ndrivers/gpu/drm/bridge/imx/Kconfig:46:config DRM_IMX8MP_HDMI_PVI\ndrivers/gpu/drm/bridge/imx/Kconfig-47-\ttristate \"Freescale i.MX8MP HDMI PVI bridge support\"\n--\ndrivers/gpu/drm/imagination/pvr_device.c=417=pvr_gpuid_decode_reg(const struct pvr_device *pvr_dev, struct pvr_gpu_id *gpu_id)\n--\ndrivers/gpu/drm/imagination/pvr_device.c-432-\t\tu32 core_id = pvr_cr_read32(pvr_dev, ROGUE_CR_CORE_ID);\ndrivers/gpu/drm/imagination/pvr_device.c:433:\t\tu16 core_id_config = PVR_CR_FIELD_GET(core_id, CORE_ID_CONFIG);\ndrivers/gpu/drm/imagination/pvr_device.c-434-\n--\ndrivers/infiniband/hw/vmw_pvrdma/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/infiniband/hw/vmw_pvrdma/Kconfig:2:config INFINIBAND_VMWARE_PVRDMA\ndrivers/infiniband/hw/vmw_pvrdma/Kconfig-3-\ttristate \"VMware Paravirtualized RDMA Driver\"\n--\ndrivers/media/usb/hdpvr/Kconfig-2-\ndrivers/media/usb/hdpvr/Kconfig:3:config VIDEO_HDPVR\ndrivers/media/usb/hdpvr/Kconfig-4-\ttristate \"Hauppauge HD PVR support\"\n--\ndrivers/media/usb/pvrusb2/Kconfig-1-# SPDX-License-Identifier: GPL-2.0-only\ndrivers/media/usb/pvrusb2/Kconfig:2:config VIDEO_PVRUSB2\ndrivers/media/usb/pvrusb2/Kconfig-3-\ttristate \"Hauppauge WinTV-PVR USB2 support\"\n--\ndrivers/media/usb/pvrusb2/Kconfig-19-\ndrivers/media/usb/pvrusb2/Kconfig:20:config VIDEO_PVRUSB2_SYSFS\ndrivers/media/usb/pvrusb2/Kconfig-21-\tbool \"pvrusb2 sysfs support\"\n--\ndrivers/media/usb/pvrusb2/Kconfig-35-\ndrivers/media/usb/pvrusb2/Kconfig:36:config VIDEO_PVRUSB2_DVB\ndrivers/media/usb/pvrusb2/Kconfig-37-\tbool \"pvrusb2 ATSC/DVB support\"\n--\ndrivers/media/usb/pvrusb2/Kconfig-56-\ndrivers/media/usb/pvrusb2/Kconfig:57:config VIDEO_PVRUSB2_DEBUGIFC\ndrivers/media/usb/pvrusb2/Kconfig-58-\tbool \"pvrusb2 debug interface\"\n--\ndrivers/misc/pvpanic/Kconfig-7-\ndrivers/misc/pvpanic/Kconfig:8:config PVPANIC\ndrivers/misc/pvpanic/Kconfig-9-\tbool \"pvpanic device support\"\n--\ndrivers/misc/pvpanic/Kconfig-14-\ndrivers/misc/pvpanic/Kconfig:15:config PVPANIC_MMIO\ndrivers/misc/pvpanic/Kconfig-16-\ttristate \"pvpanic MMIO device support\"\n--\ndrivers/misc/pvpanic/Kconfig-20-\ndrivers/misc/pvpanic/Kconfig:21:config PVPANIC_PCI\ndrivers/misc/pvpanic/Kconfig-22-\ttristate \"pvpanic PCI device support\"\n--\ndrivers/net/Kconfig=179=config MACVTAP\n--\ndrivers/net/Kconfig-192-\ndrivers/net/Kconfig:193:config IPVLAN_L3S\ndrivers/net/Kconfig-194-\tdepends on NETFILTER\n--\ndrivers/net/Kconfig-198-\ndrivers/net/Kconfig:199:config IPVLAN\ndrivers/net/Kconfig-200-\ttristate \"IP-VLAN support\"\n--\ndrivers/net/Kconfig-215-\ndrivers/net/Kconfig:216:config IPVTAP\ndrivers/net/Kconfig-217-\ttristate \"IP-VLAN based tap driver\"\n--\ndrivers/net/wan/hdlc_fr.c-16-\ndrivers/net/wan/hdlc_fr.c:17: (active) -\u003e 0 when \"ifconfig PVC down\" or \"link unreliable\" or \"PVC create\"\ndrivers/net/wan/hdlc_fr.c-18-\t -\u003e 1 when \"PVC up\" and (exist,new) = 1,0\n--\ndrivers/net/wan/hdlc_fr.c=456=static void fr_lmi_send(struct net_device *dev, int fullrep)\n--\ndrivers/net/wan/hdlc_fr.c-513-\ndrivers/net/wan/hdlc_fr.c:514:\t\t\t/* ifconfig PVC up */\ndrivers/net/wan/hdlc_fr.c-515-\t\t\tif (pvc-\u003eopen_count \u0026\u0026 !pvc-\u003estate.active \u0026\u0026\n--\ndrivers/phy/samsung/Kconfig=65=config PHY_EXYNOS5250_USB2\n--\ndrivers/phy/samsung/Kconfig-69-\ndrivers/phy/samsung/Kconfig:70:config PHY_S5PV210_USB2\ndrivers/phy/samsung/Kconfig-71-\tbool \"Support for S5PV210\"\n--\ndrivers/pinctrl/visconti/Kconfig=2=config PINCTRL_VISCONTI\n--\ndrivers/pinctrl/visconti/Kconfig-8-\ndrivers/pinctrl/visconti/Kconfig:9:config PINCTRL_TMPV7700\ndrivers/pinctrl/visconti/Kconfig-10-\tbool \"Toshiba Visconti TMPV7700 series pinctrl driver\"\n--\ndrivers/regulator/Kconfig=1091=config REGULATOR_PFUZE100\n--\ndrivers/regulator/Kconfig-1098-\ndrivers/regulator/Kconfig:1099:config REGULATOR_PV88060\ndrivers/regulator/Kconfig-1100-\ttristate \"Powerventure Semiconductor PV88060 regulator\"\n--\ndrivers/regulator/Kconfig-1106-\ndrivers/regulator/Kconfig:1107:config REGULATOR_PV88080\ndrivers/regulator/Kconfig-1108-\ttristate \"Powerventure Semiconductor PV88080 regulator\"\n--\ndrivers/regulator/Kconfig-1113-\ndrivers/regulator/Kconfig:1114:config REGULATOR_PV88090\ndrivers/regulator/Kconfig-1115-\ttristate \"Powerventure Semiconductor PV88090 regulator\"\n--\ndrivers/scsi/Kconfig=553=config SCSI_MYRS\n--\ndrivers/scsi/Kconfig-568-\ndrivers/scsi/Kconfig:569:config VMWARE_PVSCSI\ndrivers/scsi/Kconfig-570-\ttristate \"VMware PVSCSI driver support\"\n--\ndrivers/video/fbdev/Kconfig=577=config FB_XVR1000\n--\ndrivers/video/fbdev/Kconfig-586-\ndrivers/video/fbdev/Kconfig:587:config FB_PVR2\ndrivers/video/fbdev/Kconfig-588-\ttristate \"NEC PowerVR 2 display support\"\n--\ndrivers/xen/Kconfig=208=config XEN_PCIDEV_BACKEND\n--\ndrivers/xen/Kconfig-231-\ndrivers/xen/Kconfig:232:config XEN_PVCALLS_FRONTEND\ndrivers/xen/Kconfig-233-\ttristate \"XEN PV Calls frontend driver\"\n--\ndrivers/xen/Kconfig-241-\ndrivers/xen/Kconfig:242:config XEN_PVCALLS_BACKEND\ndrivers/xen/Kconfig-243-\ttristate \"XEN PV Calls backend driver\"\n--\ndrivers/xen/Kconfig=298=config XEN_MCE_LOG\n--\ndrivers/xen/Kconfig-304-\ndrivers/xen/Kconfig:305:config XEN_HAVE_PVMMU\ndrivers/xen/Kconfig-306-\tbool\n--\nnet/6lowpan/Kconfig=40=config 6LOWPAN_NHC_HOP\n--\nnet/6lowpan/Kconfig-46-\nnet/6lowpan/Kconfig:47:config 6LOWPAN_NHC_IPV6\nnet/6lowpan/Kconfig-48-\ttristate \"IPv6 Header Support\"\n--\nnet/6lowpan/Kconfig=77=config 6LOWPAN_GHC_UDP\n--\nnet/6lowpan/Kconfig-81-\nnet/6lowpan/Kconfig:82:config 6LOWPAN_GHC_ICMPV6\nnet/6lowpan/Kconfig-83-\ttristate \"GHC ICMPv6 Support\"\n--\nnet/dsa/tag_dsa.c-81- * on transmit by the CPU to defer the forwarding decision to the\nnet/dsa/tag_dsa.c:82: * hardware, based on the current config of PVT/VTU/ATU\nnet/dsa/tag_dsa.c-83- * etc. Source address learning takes places if enabled on the\n--\nnet/ipv4/Kconfig=268=config SYN_COOKIES\n--\nnet/ipv4/Kconfig-303-\nnet/ipv4/Kconfig:304:config NET_IPVTI\nnet/ipv4/Kconfig-305-\ttristate \"Virtual (secure) IP: tunneling\"\n--\nnet/ipv4/netfilter/Kconfig=6=menu \"IP: Netfilter Configuration\"\n--\nnet/ipv4/netfilter/Kconfig-8-\nnet/ipv4/netfilter/Kconfig:9:config NF_DEFRAG_IPV4\nnet/ipv4/netfilter/Kconfig-10-\ttristate\n--\nnet/ipv4/netfilter/Kconfig=14=config IP_NF_IPTABLES_LEGACY\n--\nnet/ipv4/netfilter/Kconfig-23-\nnet/ipv4/netfilter/Kconfig:24:config NF_SOCKET_IPV4\nnet/ipv4/netfilter/Kconfig-25-\ttristate \"IPv4 socket lookup support\"\n--\nnet/ipv4/netfilter/Kconfig-29-\nnet/ipv4/netfilter/Kconfig:30:config NF_TPROXY_IPV4\nnet/ipv4/netfilter/Kconfig-31-\ttristate \"IPv4 tproxy support\"\n--\nnet/ipv4/netfilter/Kconfig=33=if NF_TABLES\nnet/ipv4/netfilter/Kconfig-34-\nnet/ipv4/netfilter/Kconfig:35:config NF_TABLES_IPV4\nnet/ipv4/netfilter/Kconfig-36-\tbool \"IPv4 nf_tables support\"\n--\nnet/ipv4/netfilter/Kconfig=40=if NF_TABLES_IPV4\nnet/ipv4/netfilter/Kconfig-41-\nnet/ipv4/netfilter/Kconfig:42:config NFT_REJECT_IPV4\nnet/ipv4/netfilter/Kconfig-43-\tselect NF_REJECT_IPV4\n--\nnet/ipv4/netfilter/Kconfig-46-\nnet/ipv4/netfilter/Kconfig:47:config NFT_DUP_IPV4\nnet/ipv4/netfilter/Kconfig-48-\ttristate \"IPv4 nf_tables packet duplication support\"\n--\nnet/ipv4/netfilter/Kconfig-53-\nnet/ipv4/netfilter/Kconfig:54:config NFT_FIB_IPV4\nnet/ipv4/netfilter/Kconfig-55-\tselect NFT_FIB\n--\nnet/ipv4/netfilter/Kconfig=70=endif # NF_TABLES\nnet/ipv4/netfilter/Kconfig-71-\nnet/ipv4/netfilter/Kconfig:72:config NF_DUP_IPV4\nnet/ipv4/netfilter/Kconfig-73-\ttristate \"Netfilter IPv4 packet duplication to alternate destination\"\n--\nnet/ipv4/netfilter/Kconfig=79=config NF_LOG_ARP\n--\nnet/ipv4/netfilter/Kconfig-86-\nnet/ipv4/netfilter/Kconfig:87:config NF_LOG_IPV4\nnet/ipv4/netfilter/Kconfig-88-\ttristate \"IPv4 packet logging\"\n--\nnet/ipv4/netfilter/Kconfig-94-\nnet/ipv4/netfilter/Kconfig:95:config NF_REJECT_IPV4\nnet/ipv4/netfilter/Kconfig-96-\ttristate \"IPv4 packet rejection\"\n--\nnet/ipv6/Kconfig-5-\nnet/ipv6/Kconfig:6:menuconfig IPV6\nnet/ipv6/Kconfig-7-\tbool \"The IPv6 protocol\"\n--\nnet/ipv6/Kconfig=19=if IPV6\nnet/ipv6/Kconfig-20-\nnet/ipv6/Kconfig:21:config IPV6_ROUTER_PREF\nnet/ipv6/Kconfig-22-\tbool \"IPv6: Router Preference (RFC 4191) support\"\n--\nnet/ipv6/Kconfig-30-\nnet/ipv6/Kconfig:31:config IPV6_ROUTE_INFO\nnet/ipv6/Kconfig-32-\tbool \"IPv6: Route Information (RFC 4191) support\"\n--\nnet/ipv6/Kconfig-38-\nnet/ipv6/Kconfig:39:config IPV6_OPTIMISTIC_DAD\nnet/ipv6/Kconfig-40-\tbool \"IPv6: Enable RFC 4429 Optimistic DAD\"\n--\nnet/ipv6/Kconfig=102=config INET6_IPCOMP\n--\nnet/ipv6/Kconfig-111-\nnet/ipv6/Kconfig:112:config IPV6_MIP6\nnet/ipv6/Kconfig-113-\ttristate \"IPv6: Mobility\"\n--\nnet/ipv6/Kconfig-119-\nnet/ipv6/Kconfig:120:config IPV6_ILA\nnet/ipv6/Kconfig-121-\ttristate \"IPv6: Identifier Locator Addressing (ILA)\"\n--\nnet/ipv6/Kconfig=146=config INET6_TUNNEL\n--\nnet/ipv6/Kconfig-149-\nnet/ipv6/Kconfig:150:config IPV6_VTI\nnet/ipv6/Kconfig-151-\ttristate \"Virtual (secure) IPv6: tunneling\"\n--\nnet/ipv6/Kconfig-161-\nnet/ipv6/Kconfig:162:config IPV6_SIT\nnet/ipv6/Kconfig-163-\ttristate \"IPv6: IPv6-in-IPv4 tunnel (SIT driver)\"\n--\nnet/ipv6/Kconfig-176-\nnet/ipv6/Kconfig:177:config IPV6_SIT_6RD\nnet/ipv6/Kconfig-178-\tbool \"IPv6: IPv6 Rapid Deployment (6RD)\"\n--\nnet/ipv6/Kconfig-195-\nnet/ipv6/Kconfig:196:config IPV6_NDISC_NODETYPE\nnet/ipv6/Kconfig-197-\tbool\nnet/ipv6/Kconfig-198-\nnet/ipv6/Kconfig:199:config IPV6_TUNNEL\nnet/ipv6/Kconfig-200-\ttristate \"IPv6: IP-in-IPv6 tunnel (RFC2473)\"\n--\nnet/ipv6/Kconfig-209-\nnet/ipv6/Kconfig:210:config IPV6_GRE\nnet/ipv6/Kconfig-211-\ttristate \"IPv6: GRE tunnel\"\n--\nnet/ipv6/Kconfig-227-\nnet/ipv6/Kconfig:228:config IPV6_FOU\nnet/ipv6/Kconfig-229-\ttristate\n--\nnet/ipv6/Kconfig-231-\nnet/ipv6/Kconfig:232:config IPV6_FOU_TUNNEL\nnet/ipv6/Kconfig-233-\ttristate\n--\nnet/ipv6/Kconfig-236-\nnet/ipv6/Kconfig:237:config IPV6_MULTIPLE_TABLES\nnet/ipv6/Kconfig-238-\tbool \"IPv6: Multiple Routing Tables\"\n--\nnet/ipv6/Kconfig-242-\nnet/ipv6/Kconfig:243:config IPV6_SUBTREES\nnet/ipv6/Kconfig-244-\tbool \"IPv6: source address based routing\"\n--\nnet/ipv6/Kconfig-256-\nnet/ipv6/Kconfig:257:config IPV6_MROUTE\nnet/ipv6/Kconfig-258-\tbool \"IPv6: multicast routing\"\n--\nnet/ipv6/Kconfig-264-\nnet/ipv6/Kconfig:265:config IPV6_MROUTE_MULTIPLE_TABLES\nnet/ipv6/Kconfig-266-\tbool \"IPv6: multicast policy routing\"\n--\nnet/ipv6/Kconfig-278-\nnet/ipv6/Kconfig:279:config IPV6_PIMSM_V2\nnet/ipv6/Kconfig-280-\tbool \"IPv6: PIM-SM version 2 support\"\n--\nnet/ipv6/Kconfig-285-\nnet/ipv6/Kconfig:286:config IPV6_SEG6_LWTUNNEL\nnet/ipv6/Kconfig-287-\tbool \"IPv6: Segment Routing Header encapsulation support\"\n--\nnet/ipv6/Kconfig-299-\nnet/ipv6/Kconfig:300:config IPV6_SEG6_HMAC\nnet/ipv6/Kconfig-301-\tbool \"IPv6: Segment Routing HMAC support\"\n--\nnet/ipv6/Kconfig-311-\nnet/ipv6/Kconfig:312:config IPV6_SEG6_BPF\nnet/ipv6/Kconfig-313-\tdef_bool y\n--\nnet/ipv6/Kconfig-316-\nnet/ipv6/Kconfig:317:config IPV6_RPL_LWTUNNEL\nnet/ipv6/Kconfig-318-\tbool \"IPv6: RPL Source Routing Header support\"\n--\nnet/ipv6/Kconfig-327-\nnet/ipv6/Kconfig:328:config IPV6_IOAM6_LWTUNNEL\nnet/ipv6/Kconfig-329-\tbool \"IPv6: IOAM Pre-allocated Trace insertion support\"\n--\nnet/ipv6/netfilter/Kconfig=10=config IP6_NF_IPTABLES_LEGACY\n--\nnet/ipv6/netfilter/Kconfig-19-\nnet/ipv6/netfilter/Kconfig:20:config NF_SOCKET_IPV6\nnet/ipv6/netfilter/Kconfig-21-\ttristate \"IPv6 socket lookup support\"\n--\nnet/ipv6/netfilter/Kconfig-25-\nnet/ipv6/netfilter/Kconfig:26:config NF_TPROXY_IPV6\nnet/ipv6/netfilter/Kconfig-27-\ttristate \"IPv6 tproxy support\"\n--\nnet/ipv6/netfilter/Kconfig=29=if NF_TABLES\nnet/ipv6/netfilter/Kconfig-30-\nnet/ipv6/netfilter/Kconfig:31:config NF_TABLES_IPV6\nnet/ipv6/netfilter/Kconfig-32-\tbool \"IPv6 nf_tables support\"\n--\nnet/ipv6/netfilter/Kconfig=36=if NF_TABLES_IPV6\nnet/ipv6/netfilter/Kconfig-37-\nnet/ipv6/netfilter/Kconfig:38:config NFT_REJECT_IPV6\nnet/ipv6/netfilter/Kconfig-39-\tselect NF_REJECT_IPV6\n--\nnet/ipv6/netfilter/Kconfig-42-\nnet/ipv6/netfilter/Kconfig:43:config NFT_DUP_IPV6\nnet/ipv6/netfilter/Kconfig-44-\ttristate \"IPv6 nf_tables packet duplication support\"\n--\nnet/ipv6/netfilter/Kconfig-49-\nnet/ipv6/netfilter/Kconfig:50:config NFT_FIB_IPV6\nnet/ipv6/netfilter/Kconfig-51-\ttristate \"nf_tables fib / ipv6 route lookup support\"\n--\nnet/ipv6/netfilter/Kconfig=59=endif # NF_TABLES\nnet/ipv6/netfilter/Kconfig-60-\nnet/ipv6/netfilter/Kconfig:61:config NF_DUP_IPV6\nnet/ipv6/netfilter/Kconfig-62-\ttristate \"Netfilter IPv6 packet duplication to alternate destination\"\n--\nnet/ipv6/netfilter/Kconfig-67-\nnet/ipv6/netfilter/Kconfig:68:config NF_REJECT_IPV6\nnet/ipv6/netfilter/Kconfig-69-\ttristate \"IPv6 packet rejection\"\n--\nnet/ipv6/netfilter/Kconfig-71-\nnet/ipv6/netfilter/Kconfig:72:config NF_LOG_IPV6\nnet/ipv6/netfilter/Kconfig-73-\ttristate \"IPv6 packet logging\"\n--\nnet/ipv6/netfilter/Kconfig=132=config IP6_NF_MATCH_HL\n--\nnet/ipv6/netfilter/Kconfig-140-\nnet/ipv6/netfilter/Kconfig:141:config IP6_NF_MATCH_IPV6HEADER\nnet/ipv6/netfilter/Kconfig-142-\ttristate '\"ipv6header\" IPv6 Extension Headers Match'\n--\nnet/ipv6/netfilter/Kconfig=300=endmenu\nnet/ipv6/netfilter/Kconfig-301-\nnet/ipv6/netfilter/Kconfig:302:config NF_DEFRAG_IPV6\nnet/ipv6/netfilter/Kconfig-303-\ttristate\n--\nnet/mptcp/Kconfig=16=config INET_MPTCP_DIAG\n--\nnet/mptcp/Kconfig-19-\nnet/mptcp/Kconfig:20:config MPTCP_IPV6\nnet/mptcp/Kconfig-21-\tbool \"MPTCP: IPv6 support for Multipath TCP\"\n--\nnet/netfilter/Kconfig=1365=config NETFILTER_XT_MATCH_IPRANGE\n--\nnet/netfilter/Kconfig-1374-\nnet/netfilter/Kconfig:1375:config NETFILTER_XT_MATCH_IPVS\nnet/netfilter/Kconfig-1376-\ttristate '\"ipvs\" match support'\n--\nnet/netfilter/ipvs/Kconfig=345=config\tIP_VS_PE_SIP\n--\nnet/netfilter/ipvs/Kconfig-351-\nnet/netfilter/ipvs/Kconfig:352:config GCOV_PROFILE_IPVS\nnet/netfilter/ipvs/Kconfig-353-\tbool \"Enable GCOV profiling for IPVS\"\n--\nnet/rxrpc/Kconfig=25=if AF_RXRPC\nnet/rxrpc/Kconfig-26-\nnet/rxrpc/Kconfig:27:config AF_RXRPC_IPV6\nnet/rxrpc/Kconfig-28-\tbool \"IPv6 support for RxRPC\"\n"
} |
| 33/2 | 2026/08/12 10:58 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 40710 output: 17 thoughts: 262 Thoughts: **My Assessment of the KVM Configuration for s390 Architecture** Alright, looking at this, it seems like `KVM` is the crucial configuration option we need to consider. The core changes are confined to `arch/s390/kvm/`, and that directory gets compiled only when `CONFIG_KVM` is enabled. That simplifies things; I don't see any obvious need to look at other configurations. Confirmed, `CONFIG_KVM` is sufficient. Now, let's nail down the critical symbols we're dealing with. The key functions highlighted are: * `dat_cond_set_storage_key` * `kvm_s390_inject_vcpu` * `kvm_s390_set_irq_state` * `kvm_arch_set_irq_inatomic` * `kvm_s390_pv_deinit_vm` * `kvm_s390_pv_init_vm` * `kvm_s390_pv_set_aside` * `guest_translate_address_with_key` Hang on a second. I spot `kvm_s390_pv_set_aside`, and that hints at PV support. Checking for a dedicated PV configuration is sensible here. I'll need to double check the `arch/s390/kvm/Makefile` to confirm the presence and nature of the PV configuration. |
| 34/2 | 2026/08/12 10:58 | tool | grepper |
0mArgs:{
"Expression": "pv\\.o"
}Results: {
"Output": "arch/s390/kvm/Makefile=10=kvm-y += kvm-s390.o intercept.o interrupt.o priv.o sigp.o\narch/s390/kvm/Makefile:11:kvm-y += diag.o gaccess.o guestdbg.o vsie.o pv.o\narch/s390/kvm/Makefile-12-kvm-y += dat.o gmap.o faultin.o\n--\narch/x86/xen/Makefile=8=endif\n--\narch/x86/xen/Makefile-10-# Make sure early boot has no stackprotector\narch/x86/xen/Makefile:11:CFLAGS_enlighten_pv.o\t\t:= -fno-stack-protector\narch/x86/xen/Makefile:12:CFLAGS_mmu_pv.o\t\t\t:= -fno-stack-protector\narch/x86/xen/Makefile-13-\n--\narch/x86/xen/Makefile=27=obj-$(CONFIG_XEN_PV)\t\t+= pmu.o\narch/x86/xen/Makefile:28:obj-$(CONFIG_XEN_PV)\t\t+= suspend_pv.o\narch/x86/xen/Makefile-29-obj-$(CONFIG_XEN_PV)\t\t+= p2m.o\narch/x86/xen/Makefile:30:obj-$(CONFIG_XEN_PV)\t\t+= enlighten_pv.o\narch/x86/xen/Makefile:31:obj-$(CONFIG_XEN_PV)\t\t+= mmu_pv.o\narch/x86/xen/Makefile-32-obj-$(CONFIG_XEN_PV)\t\t+= irq.o\n--\narch/x86/xen/Makefile=40=obj-$(CONFIG_SMP)\t\t+= smp.o\narch/x86/xen/Makefile:41:obj-$(CONFIG_XEN_PV_SMP) \t+= smp_pv.o\narch/x86/xen/Makefile-42-obj-$(CONFIG_XEN_PVHVM_SMP) \t+= smp_hvm.o\n"
} |
| 35/2 | 2026/08/12 10:58 | llm | patch-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 41859 output: 209 thoughts: 617 Thoughts: **KVM Configuration and Functionality Review for s390 Architecture** Alright, let's break this down. My initial thought is that since `pv.o` is always compiled when `kvm` is, then realistically, `CONFIG_KVM` should be the only configuration option we need to be concerned with. Just to be sure, let me verify that thought. Next, I need to check some specific functions. The `guest_translate_address_with_key` function needs double checking. It resides in `arch/s390/kvm/gaccess.c` - is it exported? Yes, it's defined in `arch/s390/kvm/gaccess.h`, so all is good there. I'll proceed to check the `kvm_s390_pv_deinit_vm` function. I've found it in `arch/s390/kvm/pv.c`. It looks like it is exported in `arch/s390/kvm/kvm-s390.h`. Let me confirm `kvm_s390_pv_init_vm` as well. It is in the same file `arch/s390/kvm/pv.c`, and it is defined in `arch/s390/kvm/kvm-s390.h`. I should probably look at `kvm_s390_pv_set_aside`. It's in `arch/s390/kvm/pv.c` and is exported in `arch/s390/kvm/kvm-s390.h`. Good. I'm also looking at `kvm_arch_set_irq_inatomic`. This is in `arch/s390/kvm/interrupt.c` and the definition is in `include/linux/kvm_host.h`. Then there's `kvm_s390_set_irq_state` which is located in `arch/s390/kvm/interrupt.c`, and exported in `arch/s390/kvm/kvm-s390.h`. I should check `kvm_s390_inject_vcpu`. This is in `arch/s390/kvm/interrupt.c` and also exported in `arch/s390/kvm/kvm-s390.h`. Finally, for good measure, I'll confirm `dat_cond_set_storage_key`. This is in `arch/s390/kvm/dat.c` and is defined in `arch/s390/kvm/dat.h`. Okay, now for a broader perspective. The patch fundamentally alters core KVM functionality specific to the s390 architecture, particularly regarding interrupt injection mechanisms, storage key management, shadow page tables, and how protected virtualization states are cleared. These areas are all reachable through KVM ioctls and guest execution, meaning there's some surface to play with. Given these kinds of changes, this patch looks functionally sound and quite promising for fuzzing. I need to be methodical in my approach, and I think it is an approach well suited to fuzz testing. The `set-results` tool seems like the right method to communicate my findings. |
| 36/2 | 2026/08/12 10:58 | tool | set-results |
0mArgs:{
"EnableConfigs": [
"KVM"
],
"FocusSymbols": [
"dat_cond_set_storage_key",
"kvm_s390_inject_vcpu",
"kvm_s390_set_irq_state",
"kvm_arch_set_irq_inatomic",
"kvm_s390_pv_deinit_vm",
"kvm_s390_pv_init_vm",
"kvm_s390_pv_set_aside",
"guest_translate_address_with_key"
],
"Reasoning": "The patch modifies core KVM functionality for the s390 architecture, including interrupt injection, storage keys handling, shadow page tables, and protected virtualization state clearing. These changes are reachable via KVM ioctls and guest execution, making them functional and worth fuzzing.",
"WorthFuzzing": true
}Results: {
"EnableConfigs": [
"KVM"
],
"FocusSymbols": [
"dat_cond_set_storage_key",
"kvm_s390_inject_vcpu",
"kvm_s390_set_irq_state",
"kvm_arch_set_irq_inatomic",
"kvm_s390_pv_deinit_vm",
"kvm_s390_pv_init_vm",
"kvm_s390_pv_set_aside",
"guest_translate_address_with_key"
],
"Reasoning": "The patch modifies core KVM functionality for the s390 architecture, including interrupt injection, storage keys handling, shadow page tables, and protected virtualization state clearing. These changes are reachable via KVM ioctls and guest execution, making them functional and worth fuzzing.",
"WorthFuzzing": true
} |
| 37/1 | 2026/08/12 10:58 | action | If |
2mArgs:{
"WorthFuzzing": true
}Results: null |
| 38/2 | 2026/08/12 10:58 | agent | kmsan-evaluator |
2mModel:best-expensive Args: null Results: {
"KMSANReasoning": "The patch fixes an uninitialized memory info-leak in `dat_cond_set_storage_key()`. When `ptep != NULL` and `ptep-\u003eh.i == true`, the local stack variable `prev` (of type `union skey`) is only partially initialized: its bitfields (`acc`, `fp`, `c`, `r`) are set, but the `reserved` bit is left uninitialized. This partially uninitialized byte is then copied to `*oldkey`. In `handle_sske()`, `oldkey.skey` is bitwise ORed into the guest's general purpose register (`vcpu-\u003erun-\u003es.regs.gprs[reg1]`). Since `vcpu-\u003erun` is shared with userspace (e.g., QEMU), this leaks 1 bit of uninitialized kernel stack memory to userspace.\n\nKMSAN is specifically designed to detect uses of uninitialized memory and kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and UBSAN cannot detect this issue because there is no out-of-bounds access, invalid free, or locking violation involved in this specific path. The patch fixes this by explicitly initializing `prev.skey = 0;`.\n\n(Note: The patch also fixes a NULL pointer dereference in `handle_pfmf` and locking bugs in `pgste_set_unlock_multiple` and `kvm_s390_set_irq_state`, which would be caught by KASAN and LOCKDEP. However, the uninitialized stack memory leak strictly requires KMSAN).",
"NeedsKMSAN": true
}Instruction: You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.
CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
a comprehensive suite of debugging tools and sanitizers, including KASAN
(out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
(locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
or page allocations) and kernel-to-user memory info-leaks.
Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.
Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.
Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
attributes, ioctl output arguments, socket options, or BPF buffers) where fields
or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
uninitialized bytes of existing buffers.
Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
dereferences, locking deadlocks, or use-after-free bugs (these are already caught
by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.
Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.
Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.
Prompt: For your convenience, here is the diff of the changes:
commit 1bc8b259123223efa2a02b2a5757befc15086cdb
Author: syz-cluster <triage@syzkaller.com>
Date: Wed Aug 12 10:56:42 2026 +0000
syz-cluster: applied patch under review
diff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c
index 3f2d6e8902d76..f2ea013cb33e2 100644
--- a/arch/s390/kvm/dat.c
+++ b/arch/s390/kvm/dat.c
@@ -722,9 +722,12 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf
if (rc)
return rc;
- if (!ptep)
+ if (!ptep) {
+ if (!oldkey)
+ oldkey = &prev;
return page_cond_set_storage_key(large_crste_to_phys(*crstep, gfn), skey, oldkey,
nq, mr, mc);
+ }
old = pgste_get_lock(ptep);
pgste = old;
@@ -734,6 +737,7 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf
pgste.fp = skey.fp;
pgste.gc = skey.c;
pgste.gr = skey.r;
+ prev.skey = 0;
if (!ptep->h.i) {
rc = page_cond_set_storage_key(pte_origin(*ptep), skey, &prev, nq, mr, mc);
@@ -920,11 +924,8 @@ static void pgste_set_unlock_multiple(union pte *first, int n, union pgste *pgst
{
int i;
- for (i = 0; i < n; i++) {
- if (!pgstes[i].pcl)
- break;
+ for (i = 0; i < n; i++)
pgste_set_unlock(first + i, pgstes[i]);
- }
}
static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgstes)
@@ -937,7 +938,7 @@ static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgs
}
if (i == n)
return true;
- pgste_set_unlock_multiple(first, n, pgstes);
+ pgste_set_unlock_multiple(first, i, pgstes);
return false;
}
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 36102b2727fbf..f3a889988cdb6 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -1507,6 +1507,7 @@ static int _do_shadow_crste(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gpa_
static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
unsigned long saddr, struct pgtwalk *w)
{
+ struct kvm_memory_slot *slot;
struct guest_fault *entries;
int flags, i, hl, gl, l, rc;
union crste *table, *host;
@@ -1551,8 +1552,17 @@ static int _gaccess_do_shadow(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
return -EAGAIN;
}
+retry:
rc = dat_entry_walk(NULL, entries[LEVEL_MEM].gfn, sg->parent->asce, DAT_WALK_LEAF,
TABLE_TYPE_PAGE_TABLE, &host, &ptep_h);
+ if (rc == -ENOENT) {
+ slot = gfn_to_memslot(sg->kvm, entries[LEVEL_MEM].gfn);
+ if (!slot)
+ return PGM_ADDRESSING;
+ rc = gmap_link(mc, sg->parent, entries + LEVEL_MEM, slot);
+ if (!rc)
+ goto retry;
+ }
if (rc)
return rc;
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 8f24bcd1a6d36..956164b970d06 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -273,6 +273,11 @@ static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
}
+static inline int gisa_test_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
+{
+ return test_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *)gisa);
+}
+
static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
{
unsigned long pending = vcpu->kvm->arch.float_int.pending_irqs |
@@ -1550,23 +1555,21 @@ static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
}
#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
-static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
struct kvm_s390_stop_info *stop = &li->irq.stop;
- int rc = 0;
vcpu->stat.inject_stop_signal++;
trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
return -EINVAL;
-
if (is_vcpu_stopped(vcpu)) {
- if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
- rc = kvm_s390_store_status_unloaded(vcpu,
- KVM_S390_STORE_STATUS_NOADDR);
- return rc;
+ if (!(irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS))
+ return 0;
+ *storestatus = true;
+ return -EWOULDBLOCK;
}
if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
@@ -2102,7 +2105,7 @@ void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
spin_unlock(&li->lock);
}
-static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
+static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq, bool *storestatus)
{
int rc;
@@ -2114,7 +2117,7 @@ static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
rc = __inject_set_prefix(vcpu, irq);
break;
case KVM_S390_SIGP_STOP:
- rc = __inject_sigp_stop(vcpu, irq);
+ rc = __inject_sigp_stop(vcpu, irq, storestatus);
break;
case KVM_S390_RESTART:
rc = __inject_sigp_restart(vcpu);
@@ -2150,11 +2153,16 @@ static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
+ bool storestatus = false;
int rc;
spin_lock(&li->lock);
- rc = do_inject_vcpu(vcpu, irq);
+ rc = do_inject_vcpu(vcpu, irq, &storestatus);
spin_unlock(&li->lock);
+
+ if (rc == -EWOULDBLOCK && storestatus)
+ rc = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);
+
if (!rc)
kvm_s390_vcpu_wakeup(vcpu);
return rc;
@@ -2242,7 +2250,7 @@ static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
ret = -ENOMEM;
goto out_nolock;
}
- if (gisa_tac_ipm_gisc(gi->origin, i)) {
+ if (gisa_test_ipm_gisc(gi->origin, i)) {
irq = (struct kvm_s390_irq *) &buf[n];
irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
irq->u.io.io_int_word = isc_to_int_word(i);
@@ -2976,12 +2984,14 @@ static int adapter_indicators_set(struct kvm *kvm,
struct s390_io_adapter *adapter,
struct kvm_s390_adapter_int *adapter_int)
{
- unsigned long bit;
- int summary_set, idx;
struct s390_map_info *ind_info, *summary_info;
- void *map;
struct page *ind_page, *summary_page;
unsigned long flags;
+ unsigned long bit;
+ int summary_set;
+ void *map;
+
+ guard(srcu)(&kvm->srcu);
ind_page = NULL;
@@ -2992,21 +3002,20 @@ static int adapter_indicators_set(struct kvm *kvm,
ind_page = pin_map_page(kvm, adapter_int->ind_addr, 0);
if (!ind_page)
return -1;
- idx = srcu_read_lock(&kvm->srcu);
map = page_address(ind_page);
bit = get_ind_bit(adapter_int->ind_addr,
adapter_int->ind_offset, adapter->swap);
set_bit(bit, map);
- mark_page_dirty(kvm, adapter_int->ind_gaddr >> PAGE_SHIFT);
- set_page_dirty_lock(ind_page);
- srcu_read_unlock(&kvm->srcu, idx);
+ set_page_dirty(ind_page);
unpin_user_page(ind_page);
} else {
map = page_address(ind_info->page);
bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap);
set_bit(bit, map);
+ set_page_dirty(ind_info->page);
spin_unlock_irqrestore(&adapter->maps_lock, flags);
}
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->ind_gaddr));
spin_lock_irqsave(&adapter->maps_lock, flags);
summary_info = get_map_info(adapter, adapter_int->summary_addr);
@@ -3015,22 +3024,21 @@ static int adapter_indicators_set(struct kvm *kvm,
summary_page = pin_map_page(kvm, adapter_int->summary_addr, 0);
if (WARN_ON_ONCE(!summary_page))
return -1;
- idx = srcu_read_lock(&kvm->srcu);
map = page_address(summary_page);
bit = get_ind_bit(adapter_int->summary_addr,
adapter_int->summary_offset, adapter->swap);
summary_set = test_and_set_bit(bit, map);
- mark_page_dirty(kvm, adapter_int->summary_gaddr >> PAGE_SHIFT);
- set_page_dirty_lock(summary_page);
- srcu_read_unlock(&kvm->srcu, idx);
+ set_page_dirty(summary_page);
unpin_user_page(summary_page);
} else {
map = page_address(summary_info->page);
bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset,
adapter->swap);
summary_set = test_and_set_bit(bit, map);
+ set_page_dirty(summary_info->page);
spin_unlock_irqrestore(&adapter->maps_lock, flags);
}
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->summary_gaddr));
return summary_set ? 0 : 1;
}
@@ -3040,26 +3048,30 @@ static int adapter_indicators_set_fast(struct kvm *kvm,
struct kvm_s390_adapter_int *adapter_int,
int setbit)
{
+ struct s390_map_info *ind_info, *summary_info;
unsigned long bit;
int summary_set;
- struct s390_map_info *ind_info, *summary_info;
void *map;
- spin_lock(&adapter->maps_lock);
+ guard(srcu)(&kvm->srcu);
+ guard(spinlock)(&adapter->maps_lock);
+
ind_info = get_map_info(adapter, adapter_int->ind_addr);
- if (!ind_info) {
- spin_unlock(&adapter->maps_lock);
+ if (!ind_info)
return -EWOULDBLOCK;
- }
+
map = page_address(ind_info->page);
bit = get_ind_bit(ind_info->addr, adapter_int->ind_offset, adapter->swap);
- if (setbit)
+ if (setbit) {
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->ind_gaddr));
+ set_page_dirty(ind_info->page);
set_bit(bit, map);
+ }
+
summary_info = get_map_info(adapter, adapter_int->summary_addr);
- if (!summary_info) {
- spin_unlock(&adapter->maps_lock);
+ if (!summary_info)
return -EWOULDBLOCK;
- }
+
map = page_address(summary_info->page);
bit = get_ind_bit(summary_info->addr, adapter_int->summary_offset,
adapter->swap);
@@ -3069,7 +3081,9 @@ static int adapter_indicators_set_fast(struct kvm *kvm,
summary_set = test_and_set_bit(bit, map);
else
summary_set = test_and_clear_bit(bit, map);
- spin_unlock(&adapter->maps_lock);
+ mark_page_dirty(kvm, gpa_to_gfn(adapter_int->summary_gaddr));
+ set_page_dirty(summary_info->page);
+
return summary_set ? 0 : 1;
}
@@ -3197,7 +3211,8 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
{
struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
- struct kvm_s390_irq *buf;
+ struct kvm_s390_irq *buf __free(kvfree) = NULL;
+ bool tmp, storestatus = false;
int r = 0;
int n;
@@ -3205,31 +3220,33 @@ int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len
if (!buf)
return -ENOMEM;
- if (copy_from_user((void *) buf, irqstate, len)) {
- r = -EFAULT;
- goto out_free;
- }
+ if (copy_from_user((void *)buf, irqstate, len))
+ return -EFAULT;
- /*
- * Don't allow setting the interrupt state
- * when there are already interrupts pending
- */
- spin_lock(&li->lock);
- if (li->pending_irqs) {
- r = -EBUSY;
- goto out_unlock;
- }
+ scoped_guard(spinlock, &li->lock) {
+ /*
+ * Don't allow setting the interrupt state
+ * when there are already interrupts pending
+ */
+ if (li->pending_irqs)
+ return -EBUSY;
- for (n = 0; n < len / sizeof(*buf); n++) {
- r = do_inject_vcpu(vcpu, &buf[n]);
- if (r)
- break;
+ for (n = 0; n < len / sizeof(*buf); n++) {
+ tmp = false;
+ r = do_inject_vcpu(vcpu, &buf[n], &tmp);
+ if (r == -EWOULDBLOCK && tmp) {
+ storestatus = true;
+ r = 0;
+ }
+ if (r)
+ break;
+ }
}
-out_unlock:
- spin_unlock(&li->lock);
-out_free:
- vfree(buf);
+ if (storestatus) {
+ n = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);
+ return r ? r : n;
+ }
return r;
}
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 518a69c55e85c..b35340642c3ed 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -5450,7 +5450,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,
if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
return -EFAULT;
- rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
+ scoped_guard(srcu, &vcpu->kvm->srcu)
+ rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
break;
}
case KVM_S390_INTERRUPT: {
@@ -5463,7 +5464,8 @@ long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,
return -EFAULT;
if (s390int_to_s390irq(&s390int, &s390irq))
return -EINVAL;
- rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
+ scoped_guard(srcu, &vcpu->kvm->srcu)
+ rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
break;
}
default:
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index b02e0159d3cd2..98a9a57f71b9e 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -242,6 +242,10 @@ static void kvm_s390_clear_pv_state(struct kvm *kvm)
kvm->arch.pv.guest_len = 0;
kvm->arch.pv.stor_base = 0;
kvm->arch.pv.stor_var = NULL;
+ if (kvm->arch.pv.dumping) {
+ kvm_s390_vcpu_unblock_all(kvm);
+ kvm->arch.pv.dumping = false;
+ }
}
static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)
|
| 39/3 | 2026/08/12 10:58 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 7794 output: 42 thoughts: 293 Thoughts: **KMSAN Fuzzing Session Justification: Initial Assessment** Okay, so we're looking at this Linux kernel patch series and trying to figure out if it warrants a dedicated KMSAN fuzzing session. KMSAN is great for catching those nasty uninitialized memory reads – stack, heap, page allocations – and any potential kernel-to-user memory leaks, which are critical vulnerabilities to catch. Let's dig in. The patch's changes in `arch/s390/kvm/dat.c` are where it gets interesting. Specifically, that `dat_cond_set_storage_key` function. The code has been changed, it looks like there's a new check, handling for a null pointer, and some new assignments related to `prev`. Hold on a second... `prev` is a *local* variable! This is a potential red flag. If it's used before initialization that would be a serious issue KMSAN should flag. We need to follow where `dat_cond_set_storage_key` is used to understand the complete context. To figure out if there's an actual problem here, I should probably use `read-file` or `grepper` to see how `dat_cond_set_storage_key` is called and what happens with the `prev` variable. That will tell us if this patch series makes our KMSAN fuzzing session worthwhile. |
| 40/3 | 2026/08/12 10:58 | tool | grepper |
0mArgs:{
"Expression": "dat_cond_set_storage_key",
"PathPrefix": "arch/s390/kvm/dat.c"
}Results: {
"Output": "arch/s390/kvm/dat.c=700=static bool page_cond_set_storage_key(phys_addr_t paddr, union skey skey, union skey *oldkey,\n--\narch/s390/kvm/dat.c-710-\narch/s390/kvm/dat.c:711:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.c-712-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc)\n"
} |
| 41/3 | 2026/08/12 10:58 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 8617 output: 41 thoughts: 26 Thoughts: Here's a summary of my thought process, as requested: **Diving into `dat.c` for some s390 KVM analysis** Okay, time to get my hands dirty with `arch/s390/kvm/dat.c`. I need to understand this specific section. Let's start by zeroing in around line 711. That's usually a good starting point to get a sense of what's happening in that area of the code. I'm hoping to quickly identify the relevant function or data structures I'm interested in, and get a better grip of the surrounding logic. Let's see what interesting tidbits lie there. |
| 42/3 | 2026/08/12 10:59 | tool | read-file |
0mArgs:{
"File": "arch/s390/kvm/dat.c",
"FirstLine": 710,
"LineCount": 40
}Results: {
"Contents": " 710:\t\n 711:\tint dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\n 712:\t\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc)\n 713:\t{\n 714:\t\tunion pgste pgste, old;\n 715:\t\tunion crste *crstep;\n 716:\t\tunion skey prev;\n 717:\t\tunion pte *ptep;\n 718:\t\tint rc;\n 719:\t\n 720:\t\trc = dat_entry_walk(mmc, gfn, asce, DAT_WALK_LEAF_ALLOC, TABLE_TYPE_PAGE_TABLE,\n 721:\t\t\t\t \u0026crstep, \u0026ptep);\n 722:\t\tif (rc)\n 723:\t\t\treturn rc;\n 724:\t\n 725:\t\tif (!ptep) {\n 726:\t\t\tif (!oldkey)\n 727:\t\t\t\toldkey = \u0026prev;\n 728:\t\t\treturn page_cond_set_storage_key(large_crste_to_phys(*crstep, gfn), skey, oldkey,\n 729:\t\t\t\t\t\t\t nq, mr, mc);\n 730:\t\t}\n 731:\t\n 732:\t\told = pgste_get_lock(ptep);\n 733:\t\tpgste = old;\n 734:\t\n 735:\t\trc = 1;\n 736:\t\tpgste.acc = skey.acc;\n 737:\t\tpgste.fp = skey.fp;\n 738:\t\tpgste.gc = skey.c;\n 739:\t\tpgste.gr = skey.r;\n 740:\t\tprev.skey = 0;\n 741:\t\n 742:\t\tif (!ptep-\u003eh.i) {\n 743:\t\t\trc = page_cond_set_storage_key(pte_origin(*ptep), skey, \u0026prev, nq, mr, mc);\n 744:\t\t\tpgste.hc |= prev.c;\n 745:\t\t\tpgste.hr |= prev.r;\n 746:\t\t\tprev.c |= old.gc;\n 747:\t\t\tprev.r |= old.gr;\n 748:\t\t} else {\n 749:\t\t\tprev.acc = old.acc;\n"
} |
| 43/3 | 2026/08/12 10:59 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9484 output: 41 thoughts: 114 Thoughts: **Analyzing a Potential NULL Dereference** Okay, so I'm looking at this code and I see `prev` is a local variable of type `union skey prev;`. Right, standard practice for managing storage keys. Now, I remember seeing this section where if `!ptep`, it calls `page_cond_set_storage_key(..., skey, oldkey, ...)`. That's where things get interesting, and potentially dangerous. My immediate thought is, wait a second, what if `oldkey` is NULL? *Could* `page_cond_set_storage_key` dereference it without checking? It's a classic null pointer dereference issue, and I really need to verify this because that's a crash waiting to happen. It's possible that `page_cond_set_storage_key` has its own checks for this condition, or it might be relying on something higher up the call stack to ensure that `oldkey` is valid. I'd better confirm it. Let's get right into the code for `page_cond_set_storage_key` and be sure. |
| 44/3 | 2026/08/12 10:59 | tool | read-file |
0mArgs:{
"File": "arch/s390/kvm/dat.c",
"FirstLine": 690,
"LineCount": 30
}Results: {
"Contents": " 690:\t\t\tskey.r = 0;\n 691:\t\t\tskey.c = 0;\n 692:\t\t\tpage_set_storage_key(pte_origin(*ptep), skey.skey, !nq);\n 693:\t\t}\n 694:\t\n 695:\t\tdat_update_ptep_sd(old, pgste, ptep);\n 696:\t\tpgste_set_unlock(ptep, pgste);\n 697:\t\treturn 0;\n 698:\t}\n 699:\t\n 700:\tstatic bool page_cond_set_storage_key(phys_addr_t paddr, union skey skey, union skey *oldkey,\n 701:\t\t\t\t\t bool nq, bool mr, bool mc)\n 702:\t{\n 703:\t\toldkey-\u003eskey = page_get_storage_key(paddr);\n 704:\t\tif (oldkey-\u003eacc == skey.acc \u0026\u0026 oldkey-\u003efp == skey.fp \u0026\u0026\n 705:\t\t (oldkey-\u003er == skey.r || mr) \u0026\u0026 (oldkey-\u003ec == skey.c || mc))\n 706:\t\t\treturn false;\n 707:\t\tpage_set_storage_key(paddr, skey.skey, !nq);\n 708:\t\treturn true;\n 709:\t}\n 710:\t\n 711:\tint dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\n 712:\t\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc)\n 713:\t{\n 714:\t\tunion pgste pgste, old;\n 715:\t\tunion crste *crstep;\n 716:\t\tunion skey prev;\n 717:\t\tunion pte *ptep;\n 718:\t\tint rc;\n 719:\t\n"
} |
| 45/3 | 2026/08/12 10:59 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10414 output: 39 thoughts: 908 Thoughts: **Analyzing a Subtle Bug in Page Storage Key Handling**
Okay, so I'm looking at this code and immediately see a potential issue with `page_cond_set_storage_key`. It seems like `oldkey` is unconditionally dereferenced here: `oldkey->skey = page_get_storage_key(paddr);`. Aha! That's a classic NULL pointer dereference if `oldkey` is NULL.
Now, I see the patch tries to fix it:
```c
- if (!ptep)
+ if (!ptep) {
+ if (!oldkey)
+ oldkey = &prev;
return page_cond_set_storage_key(large_crste_to_phys(*crstep, gfn), skey, oldkey,
nq, mr, mc);
+ }
```
Okay, so if `oldkey` *was* NULL, it now uses `&prev`. Good, that avoids the crash. But... `prev` is *uninitialized*. The thing is, `page_cond_set_storage_key` writes to it immediately, so it's initialized *there*.
But wait. What's this? `prev.skey = 0;` is added later:
```c
pgste.fp = skey.fp;
pgste.gc = skey.c;
pgste.gr = skey.r;
+ prev.skey = 0;
if (!ptep->h.i) {
rc = page_cond_set_storage_key(pte_origin(*ptep), skey, &prev, nq, mr, mc);
```
So, `prev.skey` gets explicitly initialized to zero *before* the conditional call to `page_cond_set_storage_key`. This only happens if `ptep->h.i` is false.
Right, so if `ptep->h.i` is true, it skips that and the previous patch applies:
```c
rc = page_cond_set_storage_key(pte_origin(*ptep), skey, &prev, nq, mr, mc);
pgste.hc |= prev.c;
pgste.hr |= prev.r;
prev.c |= old.gc;
prev.r |= old.gr;
} else {
prev.acc = old.acc;
prev.fp = old.fp;
prev.c = old.gc;
prev.r = old.gr;
}
if (oldkey)
*oldkey = prev;
```
Ah ha! If `ptep->h.i` is *true*, `prev.skey` was *uninitialized* before the patch. Let's make sure:
```c
if (!ptep->h.i) {
rc = page_cond_set_storage_key(pte_origin(*ptep), skey, &prev, nq, mr, mc);
pgste.hc |= prev.c;
pgste.hr |= prev.r;
prev.c |= old.gc;
prev.r |= old.gr;
} else {
prev.acc = old.acc;
prev.fp = old.fp;
prev.c = old.gc;
prev.r = old.gr;
}
if (oldkey)
*oldkey = prev;
```
Wait, `prev` is a `union skey`:
```c
union skey {
struct {
u8 acc:4;
u8 fp:1;
u8 r:1;
u8 c:1;
u8 reserved:1;
};
u8 skey;
};
```
If `ptep->h.i` is true, we set `prev.acc`, `prev.fp`, `prev.c`, and `prev.r`. But the `reserved` bit *isn't* set! So `prev.skey` contains uninitialized bits from the stack! Then, `if (oldkey) *oldkey = prev;` copies that *uninitialized value* to `*oldkey`!
The crucial question now is: does `oldkey` get copied to userspace? I need to trace `dat_cond_set_storage_key` to be sure.
|
| 46/3 | 2026/08/12 10:59 | tool | grepper |
0mArgs:{
"Expression": "dat_cond_set_storage_key",
"PathPrefix": "arch/s390/kvm/"
}Results: {
"Output": "arch/s390/kvm/dat.c=700=static bool page_cond_set_storage_key(phys_addr_t paddr, union skey skey, union skey *oldkey,\n--\narch/s390/kvm/dat.c-710-\narch/s390/kvm/dat.c:711:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.c-712-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc)\n--\narch/s390/kvm/dat.h=536=int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.h-537-\t\t\tunion skey skey, bool nq);\narch/s390/kvm/dat.h:538:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.h-539-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc);\n--\narch/s390/kvm/kvm-s390.c=562=static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op,\n--\narch/s390/kvm/kvm-s390.c-572-\tcase KVM_S390_KEYOP_SSKE:\narch/s390/kvm/kvm-s390.c:573:\t\tr = dat_cond_set_storage_key(mc, asce, gfn, skey, \u0026skey, 0, 0, 0);\narch/s390/kvm/kvm-s390.c-574-\t\tif (r == 0 || r == 1)\n--\narch/s390/kvm/priv.c=324=static int handle_sske(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-362-\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\narch/s390/kvm/priv.c:363:\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\narch/s390/kvm/priv.c-364-\t\t\t\t\t\t gpa_to_gfn(start), key, \u0026oldkey,\n--\narch/s390/kvm/priv.c=1046=static int handle_pfmf(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1120-\t\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\narch/s390/kvm/priv.c:1121:\t\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\narch/s390/kvm/priv.c-1122-\t\t\t\t\t\t\t gpa_to_gfn(start), key,\n"
} |
| 47/3 | 2026/08/12 10:59 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 13296 output: 41 thoughts: 26 Thoughts: Okay, let's dive into this. Here's my thought process on what we're looking at, summarized from the inside: **Analyzing `handle_sske` in `arch/s390/kvm/priv.c`** Alright, so the first thing I'm doing is zeroing in on `handle_sske` within `arch/s390/kvm/priv.c`. This tells me we're dealing with S/390 architecture, specifically within the KVM (Kernel-based Virtual Machine) implementation, and that we're likely in the "priv.c" file which suggests it is related to privileged instructions or operations. Given that we're calling it a *handler* implies it's a function that responds to a particular event or instruction. `sske` itself... that's probably a Secure Execution instruction. Let me pull up the relevant architecture reference to double-check, but this smells like we are dealing with some form of Secure Execution extension or handling a related fault. Might be related to the Secure Execution Environment (SEE) or perhaps some sort of key management operation on the s390 architecture. This is definitely something that I'll have to delve into in detail, keeping in mind the complexities of secure execution features. This likely involves handling state changes, exception handling, and potentially sensitive memory access. My focus is going to be on understanding how it interacts with the KVM, what the implications are for virtual machine execution, and any potential security vulnerabilities or performance bottlenecks that might be associated with this. I'll need to carefully examine what events trigger this handler, how it interprets the guest state, and what actions it takes to maintain security or provide the requested functionality. |
| 48/3 | 2026/08/12 10:59 | tool | read-file |
0mArgs:{
"File": "arch/s390/kvm/priv.c",
"FirstLine": 324,
"LineCount": 50
}Results: {
"Contents": " 324:\tstatic int handle_sske(struct kvm_vcpu *vcpu)\n 325:\t{\n 326:\t\tunsigned char m3 = vcpu-\u003earch.sie_block-\u003eipb \u003e\u003e 28;\n 327:\t\tunsigned long start, end;\n 328:\t\tunion skey key, oldkey;\n 329:\t\tint reg1, reg2;\n 330:\t\tint rc;\n 331:\t\n 332:\t\tvcpu-\u003estat.instruction_sske++;\n 333:\t\n 334:\t\tif (vcpu-\u003earch.sie_block-\u003egpsw.mask \u0026 PSW_MASK_PSTATE)\n 335:\t\t\treturn kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);\n 336:\t\n 337:\t\trc = try_handle_skey(vcpu);\n 338:\t\tif (rc)\n 339:\t\t\treturn rc != -EAGAIN ? rc : 0;\n 340:\t\n 341:\t\tif (!test_kvm_facility(vcpu-\u003ekvm, 8))\n 342:\t\t\tm3 \u0026= ~SSKE_MB;\n 343:\t\tif (!test_kvm_facility(vcpu-\u003ekvm, 10))\n 344:\t\t\tm3 \u0026= ~(SSKE_MC | SSKE_MR);\n 345:\t\tif (!test_kvm_facility(vcpu-\u003ekvm, 14))\n 346:\t\t\tm3 \u0026= ~SSKE_NQ;\n 347:\t\n 348:\t\tkvm_s390_get_regs_rre(vcpu, \u0026reg1, \u0026reg2);\n 349:\t\n 350:\t\tkey.skey = vcpu-\u003erun-\u003es.regs.gprs[reg1] \u0026 0xfe;\n 351:\t\tstart = vcpu-\u003erun-\u003es.regs.gprs[reg2] \u0026 PAGE_MASK;\n 352:\t\tstart = kvm_s390_logical_to_effective(vcpu, start);\n 353:\t\tif (m3 \u0026 SSKE_MB) {\n 354:\t\t\t/* start already designates an absolute address */\n 355:\t\t\tend = (start + _SEGMENT_SIZE) \u0026 ~(_SEGMENT_SIZE - 1);\n 356:\t\t} else {\n 357:\t\t\tstart = kvm_s390_real_to_abs(vcpu, start);\n 358:\t\t\tend = start + PAGE_SIZE;\n 359:\t\t}\n 360:\t\n 361:\t\twhile (start != end) {\n 362:\t\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\n 363:\t\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\n 364:\t\t\t\t\t\t\t gpa_to_gfn(start), key, \u0026oldkey,\n 365:\t\t\t\t\t\t\t m3 \u0026 SSKE_NQ, m3 \u0026 SSKE_MR, m3 \u0026 SSKE_MC);\n 366:\t\t\t}\n 367:\t\t\tif (rc \u003e 1)\n 368:\t\t\t\treturn kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);\n 369:\t\t\tif (rc == -ENOMEM) {\n 370:\t\t\t\trc = kvm_s390_mmu_cache_topup(vcpu-\u003earch.mc);\n 371:\t\t\t\tif (rc)\n 372:\t\t\t\t\treturn rc;\n 373:\t\t\t\tcontinue;\n"
} |
| 49/3 | 2026/08/12 10:59 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 14675 output: 41 thoughts: 86 Thoughts: Here's my summary, as I delve into this code: **Debugging a Potential Data Race** Okay, hold on a second. I'm looking at this `handle_sske` function, and a red flag just went up. I see `oldkey` declared as a `union skey`, but it's *uninitialized* right here: ```c union skey key, oldkey; ``` Now, the function proceeds, and I see `dat_cond_set_storage_key` being called. Hmm, if that function returns 0 or 1, there's a good chance it will touch `oldkey`. This makes me wonder, does `handle_sske` ever *actually* use `oldkey`? I need to read the rest of this function to figure out if we have a potential use-before-initialization situation, and if it could lead to a data race. Let's dig deeper and see what's going on... |
| 50/3 | 2026/08/12 10:59 | tool | read-file |
0mArgs:{
"File": "arch/s390/kvm/priv.c",
"FirstLine": 370,
"LineCount": 20
}Results: {
"Contents": " 370:\t\t\t\trc = kvm_s390_mmu_cache_topup(vcpu-\u003earch.mc);\n 371:\t\t\t\tif (rc)\n 372:\t\t\t\t\treturn rc;\n 373:\t\t\t\tcontinue;\n 374:\t\t\t}\n 375:\t\t\tif (rc \u003c 0)\n 376:\t\t\t\treturn rc;\n 377:\t\t\tstart += PAGE_SIZE;\n 378:\t\t}\n 379:\t\n 380:\t\tif (m3 \u0026 (SSKE_MC | SSKE_MR)) {\n 381:\t\t\tif (m3 \u0026 SSKE_MB) {\n 382:\t\t\t\t/* skey in reg1 is unpredictable */\n 383:\t\t\t\tkvm_s390_set_psw_cc(vcpu, 3);\n 384:\t\t\t} else {\n 385:\t\t\t\tkvm_s390_set_psw_cc(vcpu, rc);\n 386:\t\t\t\tvcpu-\u003erun-\u003es.regs.gprs[reg1] \u0026= ~0xff00UL;\n 387:\t\t\t\tvcpu-\u003erun-\u003es.regs.gprs[reg1] |= (u64)oldkey.skey \u003c\u003c 8;\n 388:\t\t\t}\n 389:\t\t}\n"
} |
| 51/3 | 2026/08/12 10:59 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 15354 output: 44 thoughts: 1561 Thoughts: **Analyzing a Potential Uninitialized Memory Leak and Related Fixes**
Okay, so I'm looking at this code and immediately I see a potential issue: `vcpu->run->s.regs.gprs[reg1] |= (u64)oldkey.skey << 8;`. The variable `oldkey.skey` is being copied to the guest's general-purpose register. My concern is that if `oldkey.skey` contains uninitialized bits, it would mean uninitialized kernel stack memory is being leaked to the guest, and this is a classic vulnerability!
Now, tracing this back, `oldkey` is the output parameter of the function `dat_cond_set_storage_key`. It's a local variable `prev` inside of the function, and it is a `union`:
```c
union skey prev;
```
If `!ptep->h.i` is false (meaning `ptep->h.i` is true), then `prev` has the following values assigned to its fields:
```c
} else {
prev.acc = old.acc;
prev.fp = old.fp;
prev.c = old.gc;
prev.r = old.gr;
}
if (oldkey)
*oldkey = prev;
```
It looks like there's an issue with the `prev.reserved` field, because if the condition in the `if` statement is true, the `reserved` bits are never initialized, which means we might have a memory leak! The structure `union skey` is:
```c
union skey {
struct {
u8 acc:4;
u8 fp:1;
u8 r:1;
u8 c:1;
u8 reserved:1;
};
u8 skey;
};
```
So, after examining the code, `prev.reserved` is uninitialized, and then `*oldkey = prev;` copies the uninitialized bit to `oldkey`. This uninitialized value is then written to the guest register with the operation `vcpu->run->s.regs.gprs[reg1] |= (u64)oldkey.skey << 8;`. This clearly leaks one bit of uninitialized kernel stack memory to the guest! KMSAN would detect this for sure!
Now, I see the patch adds `prev.skey = 0;` inside the `dat_cond_set_storage_key` function:
```c
pgste.fp = skey.fp;
pgste.gc = skey.c;
pgste.gr = skey.r;
+ prev.skey = 0;
if (!ptep->h.i) {
```
This is a fix! Setting `prev.skey = 0` explicitly initializes `prev.reserved` and all the other bits to zero, so when other fields are assigned, the `reserved` bit remains zero. This removes the uninitialized memory leak.
Now, let's see if there are other uninitialized memory fixes in the patch.
In `arch/s390/kvm/gaccess.c` I see a section that seems to be related to `-ENOENT` return codes from `dat_entry_walk` and gmap linking, which doesn't seem directly related to uninitialized memory.
Finally, in `arch/s390/kvm/interrupt.c` I find that `__inject_sigp_stop` is now returning `-EWOULDBLOCK` instead of calling `kvm_s390_store_status_unloaded` directly and sets `*storestatus = true`. The reasoning here is that `kvm_s390_store_status_unloaded` may sleep or take locks, while `__inject_sigp_stop` is being called with `li->lock` held! It makes sense. It looks like it is refactoring to prevent sleeping in interrupt handlers. I need to make sure `kvm_s390_store_status_unloaded` doesn't leak memory.
|
| 52/3 | 2026/08/12 10:59 | tool | grepper |
0mArgs:{
"Expression": "kvm_s390_store_status_unloaded",
"PathPrefix": "arch/s390/kvm/"
}Results: {
"Output": "arch/s390/kvm/interrupt.c=2153=int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)\n--\narch/s390/kvm/interrupt.c-2163-\tif (rc == -EWOULDBLOCK \u0026\u0026 storestatus)\narch/s390/kvm/interrupt.c:2164:\t\trc = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);\narch/s390/kvm/interrupt.c-2165-\n--\narch/s390/kvm/interrupt.c=3211=int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)\n--\narch/s390/kvm/interrupt.c-3246-\tif (storestatus) {\narch/s390/kvm/interrupt.c:3247:\t\tn = kvm_s390_store_status_unloaded(vcpu, KVM_S390_STORE_STATUS_NOADDR);\narch/s390/kvm/interrupt.c-3248-\t\treturn r ? r : n;\n--\narch/s390/kvm/kvm-s390.c=5026=int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-5115- */\narch/s390/kvm/kvm-s390.c:5116:int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)\narch/s390/kvm/kvm-s390.c-5117-{\n--\narch/s390/kvm/kvm-s390.c=5168=int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)\n--\narch/s390/kvm/kvm-s390.c-5177-\narch/s390/kvm/kvm-s390.c:5178:\treturn kvm_s390_store_status_unloaded(vcpu, addr);\narch/s390/kvm/kvm-s390.c-5179-}\n--\narch/s390/kvm/kvm-s390.c=5531=long kvm_arch_vcpu_ioctl(struct file *filp,\n--\narch/s390/kvm/kvm-s390.c-5548-\t\tidx = srcu_read_lock(\u0026vcpu-\u003ekvm-\u003esrcu);\narch/s390/kvm/kvm-s390.c:5549:\t\tr = kvm_s390_store_status_unloaded(vcpu, arg);\narch/s390/kvm/kvm-s390.c-5550-\t\tsrcu_read_unlock(\u0026vcpu-\u003ekvm-\u003esrcu, idx);\n--\narch/s390/kvm/kvm-s390.h=456=int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod);\narch/s390/kvm/kvm-s390.h:457:int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long addr);\narch/s390/kvm/kvm-s390.h-458-int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr);\n--\narch/s390/kvm/sigp.c=191=static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/sigp.c-203-\taddr \u0026= 0x7ffffe00;\narch/s390/kvm/sigp.c:204:\trc = kvm_s390_store_status_unloaded(dst_vcpu, addr);\narch/s390/kvm/sigp.c-205-\tif (rc == -EFAULT) {\n"
} |
| 53/3 | 2026/08/12 10:59 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 19082 output: 39 thoughts: 4278 Thoughts: **Analysis of the Provided Code Snippets** Okay, here's the breakdown, from my perspective as someone deeply familiar with the nuances of this code: I see a series of targeted changes, each aiming to address specific issues within the s390 KVM subsystem. The first thing I note is the pattern - several of these patches touch areas that could benefit from enhanced safety, either for locking or data integrity. The initial fix, moving `kvm_s390_store_status_unloaded` outside the lock in `kvm_s390_inject_vcpu` and `kvm_s390_set_irq_state` , focuses on eliminating potential lock-related deadlocks or sleep-in-spinlock issues, something that could be detected with lockdep or KASAN, if it was causing memory corruption, but is not necessarily tied to uninitialized memory. That's a solid, routine maintenance fix. The modifications to `adapter_indicators_set` are more involved. The code now utilizes SRCU (read-copy update), which is a welcome improvement. Also `set_page_dirty_lock` is now `set_page_dirty` and `mark_page_dirty` moved outside the srcu read lock is all good. This likely relates to more robust dirty page tracking and locking. The change in `kvm_s390_set_irq_state` seems straightforward. The use of `__free(kvfree)` with `scoped_guard` is a standard way of simplifying error handling. This cleans up resource management, preventing memory leaks, and ensuring locks are released properly, which are all important, but don't address the core problem. `get_all_floating_irqs` is a straightforward bug fix. `gisa_tac_ipm_gisc` to `gisa_test_ipm_gisc` changes the logic of getting all floating irqs. This is, again, not related to uninitialized memory. `kvm_s390_clear_pv_state` handles a logic flaw. The introduction of unblocking vcpus based on the `dumping` flag suggests that this is correcting a flaw in how the virtual platform state is cleared during a specific operation. Now, the critical part – the modifications within `dat_cond_set_storage_key`. This is where the real value of these patches reveals itself. The core of this patch, the introduction of `prev.skey = 0;` inside the `dat_cond_set_storage_key` function, is the key. Here's why: 1. **Uninitialized Memory:** Without the patch, when the condition `ptep->h.i` is true, a `union skey` called `prev` is defined as a local variable. Only 7 of its bits would be set, however, and the "reserved" bit is *not* initialized. Then, the whole byte of `prev` is written to `*oldkey`, and subsequently if `oldkey` is copied to a guest register! This is the classic kind of information leak from the kernel. KMSAN (Kernel Memory Sanitizer) is designed specifically to catch this: it tracks the initialization of memory bits. When the uninitialized bit leaks into a shared user-kernel memory (the guest register), KMSAN flags it as an information leak. 2. **NULL Pointer Dereference:** I remember a past crash report, in a scenario where `ptep` could be NULL. The code prior to the patch would then dereference `oldkey` (if it was also NULL), causing a kernel oops, easily caught with KASAN or by a simple kernel crash. The patch now handles this situation more gracefully. The introduction of `prev.skey = 0;` addresses both the uninitialized memory issue, preventing the leak, and guards against the null-pointer dereference. This is exactly the kind of bug that KMSAN should catch, because the intent of the patch is to fix a possible data leakage to the guest. This code has been well-scrutinized, and this patch fixes real, dangerous memory safety issue that KMSAN can detect. Excellent! |
| 54/3 | 2026/08/12 11:00 | tool | grepper |
0mArgs:{
"Expression": "dat_cond_set_storage_key",
"PathPrefix": "arch/s390/kvm/"
}Results: {
"Output": "arch/s390/kvm/dat.c=700=static bool page_cond_set_storage_key(phys_addr_t paddr, union skey skey, union skey *oldkey,\n--\narch/s390/kvm/dat.c-710-\narch/s390/kvm/dat.c:711:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.c-712-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc)\n--\narch/s390/kvm/dat.h=536=int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.h-537-\t\t\tunion skey skey, bool nq);\narch/s390/kvm/dat.h:538:int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\narch/s390/kvm/dat.h-539-\t\t\t union skey skey, union skey *oldkey, bool nq, bool mr, bool mc);\n--\narch/s390/kvm/kvm-s390.c=562=static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op,\n--\narch/s390/kvm/kvm-s390.c-572-\tcase KVM_S390_KEYOP_SSKE:\narch/s390/kvm/kvm-s390.c:573:\t\tr = dat_cond_set_storage_key(mc, asce, gfn, skey, \u0026skey, 0, 0, 0);\narch/s390/kvm/kvm-s390.c-574-\t\tif (r == 0 || r == 1)\n--\narch/s390/kvm/priv.c=324=static int handle_sske(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-362-\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\narch/s390/kvm/priv.c:363:\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\narch/s390/kvm/priv.c-364-\t\t\t\t\t\t gpa_to_gfn(start), key, \u0026oldkey,\n--\narch/s390/kvm/priv.c=1046=static int handle_pfmf(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1120-\t\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\narch/s390/kvm/priv.c:1121:\t\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\narch/s390/kvm/priv.c-1122-\t\t\t\t\t\t\t gpa_to_gfn(start), key,\n"
} |
| 55/3 | 2026/08/12 11:00 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 25218 output: 42 thoughts: 26 Thoughts: Here's a summary of my thought process, as requested: **Diving into `handle_pfmf`** Okay, time to dig into the `handle_pfmf` function. It's in `arch/s390/kvm/priv.c`, so I'll navigate there in my mental file system. Given the file and function name, I'm expecting this to be related to handling Page Fault Management Function (PFMF) events, probably within the S390 KVM environment. I'll need to understand how the system manages page faults triggered from within the guest context. My immediate focus will be on: * **The context:** What information is passed to this function? Is it the faulting address, error code, or relevant KVM state? I need to understand the function signature and any data structures involved. * **The actions:** What's the core logic? Is it attempting to resolve the fault via a shadow page table lookup, signaling an error to the guest, or initiating some kind of memory management operation? * **The architecture:** I expect there will be specific S390 instructions or features that are being leveraged here, since it's an architecture-specific file. The goal is likely to translate the guest's view of memory to the host's physical memory, and the PFMF function likely helps in this mapping process. I'll be keeping a lookout for any references to the storage key facilities as well, and of course any interactions with the PSWs. * **Potential issues:** What are the error paths? What could go wrong here, and what safeguards are in place? For example, are there deadlock or race conditions? I know I'm already making some assumptions, but it's important to start with an expectation and refine it as I understand the code. |
| 56/3 | 2026/08/12 11:00 | tool | read-file |
0mArgs:{
"File": "arch/s390/kvm/priv.c",
"FirstLine": 1115,
"LineCount": 20
}Results: {
"Contents": "1115:\t\t\tif (vcpu-\u003erun-\u003es.regs.gprs[reg1] \u0026 PFMF_SK) {\n1116:\t\t\t\tint rc = kvm_s390_skey_check_enable(vcpu);\n1117:\t\n1118:\t\t\t\tif (rc)\n1119:\t\t\t\t\treturn rc;\n1120:\t\t\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock) {\n1121:\t\t\t\t\trc = dat_cond_set_storage_key(vcpu-\u003earch.mc, vcpu-\u003earch.gmap-\u003easce,\n1122:\t\t\t\t\t\t\t\t gpa_to_gfn(start), key,\n1123:\t\t\t\t\t\t\t\t NULL, nq, mr, mc);\n1124:\t\t\t\t}\n1125:\t\t\t\tif (rc \u003e 1)\n1126:\t\t\t\t\treturn kvm_s390_inject_program_int(vcpu, rc);\n1127:\t\t\t\tif (rc == -ENOMEM) {\n1128:\t\t\t\t\trc = kvm_s390_mmu_cache_topup(vcpu-\u003earch.mc);\n1129:\t\t\t\t\tif (rc)\n1130:\t\t\t\t\t\treturn rc;\n1131:\t\t\t\t\tcontinue;\n1132:\t\t\t\t}\n1133:\t\t\t\tif (rc \u003c 0)\n1134:\t\t\t\t\treturn rc;\n"
} |
| 57/3 | 2026/08/12 11:00 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 26036 output: 39 thoughts: 2572 Thoughts: **Analysis of the Uninitialized Memory Leak and Related Kernel Bugs** Okay, here's the breakdown of my thought process regarding this patch, focusing on the uninitialized memory issue and related bugs: My initial thought was: the `handle_pfmf` function might be problematic because it passes a `NULL` for `oldkey` to `dat_cond_set_storage_key`. This, in turn, could lead to a NULL pointer dereference if `ptep` is also `NULL`, as `page_cond_set_storage_key` would be called with `oldkey == NULL` inside `dat_cond_set_storage_key`. This would normally be caught by KASAN or cause a kernel panic, which is a good thing. However, I started thinking, what if `ptep` is NOT `NULL` in `handle_pfmf`? In that case, the code checks `!ptep->h.i`. If this condition is true, `page_cond_set_storage_key` is called, and `pgste` and `prev` are set. If `!ptep->h.i` is false, `prev` is initialized, but, importantly, `oldkey` is `NULL`, so there’s no writing to uninitialized memory. So, in `handle_pfmf`, because `oldkey` is `NULL`, no uninitialized memory gets leaked in that context! That’s good. Next, I looked at `handle_sske`. This is different because `oldkey` isn't `NULL` - it's passed as a pointer. So, the scenario is: If `ptep` is `NULL`, `dat_cond_set_storage_key` will call `page_cond_set_storage_key` with `&oldkey`, which is okay. If `ptep` is NOT `NULL` and `ptep->h.i` is true, then `prev` is initialized but `prev.reserved` is not initialized. Then `*oldkey = prev` copies it to `oldkey`. This is where the bug manifests. Later, `handle_sske` copies `oldkey.skey` to a guest register. Because `oldkey` contains uninitialized data, this leaks uninitialized memory to the guest, and then it is a classic information-leak to userspace through QEMU. The patch fixes two bugs: 1. A NULL pointer dereference in `handle_pfmf` when `ptep` is `NULL`. This is what KASAN would pick up. 2. An uninitialized memory leak in `handle_sske` when `ptep != NULL` and `ptep->h.i == true`. This is a classic KMSAN-style bug. The interesting part is that the uninitialized memory leak is *only* caught by KMSAN because KASAN doesn't generally track uninitialized memory. It’s a very specific KMSAN issue, as the uninitialized bit is copied to a guest register, which doesn't cause a crash or out-of-bounds access directly. I had to verify that the fix `prev.skey = 0;` addresses the leak. The `prev` is a `union skey prev`, which when declared, is uninitialized. The patch initializes the entire byte, including the reserved bit, effectively initializing the `prev.skey` bitfield with zeros. Before, only specific bitfields of `prev` were set when `ptep->h.i` is true. Because `prev` is on the stack, the `reserved` bit in the stack contains whatever was already there. This means `*oldkey = prev;` copies the entire byte, with an uninitialized bit. Then `handle_sske` copies it to `vcpu->run->s.regs.gprs[reg1]`, where `vcpu->run` is mapped to userspace (QEMU). KMSAN specifically detects this. I checked for other uninitialized memory issues in the patch. I verified that a change in `arch/s390/kvm/interrupt.c`, which calls `kvmalloc`, allocates memory and uses `copy_from_user` to initialize it from user-space. So, it's safe. There's also a retry loop added in `arch/s390/kvm/gaccess.c`, which is not related to uninitialized memory. Finally, I examined the changes in `arch/s390/kvm/dat.c`. The changes to `pgste_get_trylock_multiple` and `pgste_set_unlock_multiple` were fixing another bug. Here, the caller passes an array (`pgstes`) of unions to those two functions. If `pgste_ |
| 58/3 | 2026/08/12 11:00 | tool | grepper |
0mArgs:{
"Expression": "pgste_get_trylock_multiple",
"PathPrefix": "arch/s390/kvm/"
}Results: {
"Output": "arch/s390/kvm/dat.c=923=static void pgste_set_unlock_multiple(union pte *first, int n, union pgste *pgstes)\n--\narch/s390/kvm/dat.c-930-\narch/s390/kvm/dat.c:931:static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgstes)\narch/s390/kvm/dat.c-932-{\n--\narch/s390/kvm/dat.c=945=unsigned long dat_get_ptval(struct page_table *table, struct ptval_param param)\n--\narch/s390/kvm/dat.c-952-\narch/s390/kvm/dat.c:953:\twhile (!pgste_get_trylock_multiple(table-\u003eptes + param.offset, n, pgstes))\narch/s390/kvm/dat.c-954-\t\tcpu_relax();\n--\narch/s390/kvm/dat.c=963=void dat_set_ptval(struct page_table *table, struct ptval_param param, unsigned long val)\n--\narch/s390/kvm/dat.c-969-\narch/s390/kvm/dat.c:970:\twhile (!pgste_get_trylock_multiple(table-\u003eptes + param.offset, n, pgstes))\narch/s390/kvm/dat.c-971-\t\tcpu_relax();\n"
} |
| 59/3 | 2026/08/12 11:00 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30090 output: 41 thoughts: 28 Thoughts: Here's my attempt at summarizing the thought process, tailored for an expert audience: **Diving into DAT Translation in s390 KVM** Okay, so I need to understand how the DAT (Dynamic Address Translation) mechanism is handled within KVM for s390. My immediate thought is to check out the `dat_get_ptval` function. It's in `arch/s390/kvm/dat.c`, which makes sense; this is the architecture-specific DAT implementation, and `dat_get_ptval` is likely where the core translation logic resides. I'm guessing it's responsible for fetching the page table entry value, probably given a guest virtual address. I'll need to see how it interacts with the shadow page tables, the hardware DAT registers, and the guest's control registers. Hopefully, it’s well-commented and the register mappings are clear. I'm particularly interested in any potential optimization techniques they've employed; maybe some kind of caching or pre-fetching strategy to minimize translation overhead. And, of course, I'll be looking for any potential race conditions or synchronization issues in the code, given that KVM is inherently multithreaded. Let’s see what we can learn about this crucial piece of the KVM puzzle. |
| 60/3 | 2026/08/12 11:00 | tool | read-file |
0mArgs:{
"File": "arch/s390/kvm/dat.c",
"FirstLine": 945,
"LineCount": 30
}Results: {
"Contents": " 945:\tunsigned long dat_get_ptval(struct page_table *table, struct ptval_param param)\n 946:\t{\n 947:\t\tunion pgste pgstes[4] = {};\n 948:\t\tunsigned long res = 0;\n 949:\t\tint i, n;\n 950:\t\n 951:\t\tn = param.len + 1;\n 952:\t\n 953:\t\twhile (!pgste_get_trylock_multiple(table-\u003eptes + param.offset, n, pgstes))\n 954:\t\t\tcpu_relax();\n 955:\t\n 956:\t\tfor (i = 0; i \u003c n; i++)\n 957:\t\t\tres = res \u003c\u003c 16 | pgstes[i].val16;\n 958:\t\n 959:\t\tpgste_set_unlock_multiple(table-\u003eptes + param.offset, n, pgstes);\n 960:\t\treturn res;\n 961:\t}\n 962:\t\n 963:\tvoid dat_set_ptval(struct page_table *table, struct ptval_param param, unsigned long val)\n 964:\t{\n 965:\t\tunion pgste pgstes[4] = {};\n 966:\t\tint i, n;\n 967:\t\n 968:\t\tn = param.len + 1;\n 969:\t\n 970:\t\twhile (!pgste_get_trylock_multiple(table-\u003eptes + param.offset, n, pgstes))\n 971:\t\t\tcpu_relax();\n 972:\t\n 973:\t\tfor (i = param.len; i \u003e= 0; i--) {\n 974:\t\t\tpgstes[i].val16 = val;\n"
} |
| 61/3 | 2026/08/12 11:00 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 30909 output: 36 thoughts: 668 Thoughts: **Analyzing Potential Race Conditions in a Lock/Unlock Sequence**
Okay, so I'm looking at this C code involving a `pgste_get_trylock_multiple` function and its associated unlock function. The first thing that jumps out is the initialization: `union pgste pgstes[4] = {};`. That's standard; it initializes the entire array to zero, so `pgstes[i].pcl` will be zero for any uninitialized elements. I need to keep that in mind.
Now, looking at `pgste_get_trylock_multiple`, I see a loop that attempts to acquire multiple locks sequentially. The critical part is the error handling. If a `pgste_get_trylock` fails at index `i`, the function breaks out of the loop and calls `pgste_set_unlock_multiple` to release any previously acquired locks.
Initially, `pgste_set_unlock_multiple` was called with `n` (the total number of locks), but this has been changed to `i` (the index of failure). This is important. The old code would attempt to unlock *all* locks, which might include those that weren't actually acquired. The `pgste_set_unlock_multiple` function has a loop that iterates through the `pgstes` array to determine which locks to release. The loop continues as long as `pgstes[i].pcl` is not zero, meaning the lock was acquired.
Here's the problem. If `pgste_get_trylock` fails at index `i`, then `pgstes[i]` isn't modified. The loop breaks when it encounters the first zero, but *what if a previous iteration of the outer loop succeeded?*
I'm starting to see a race condition. Let's say this whole lock-and-retry sequence is in a loop. I see code like this: `while (!pgste_get_trylock_multiple(table->ptes + param.offset, n, pgstes)) cpu_relax();`.
Suppose in a previous iteration of that loop, `pgste_get_trylock_multiple` succeeded at index `i`, so `pgstes[i].pcl` would be 1. It fails in the next loop and then calls `pgste_set_unlock_multiple`. The array `pgstes` is on the stack, and it's initialized with 0. However, `pgstes[i].pcl` may not be zero. When the loop in `pgste_set_unlock_multiple` encounters `i` in the current iteration, if it previously succeeded at index `i`, its previous value (1) would remain and it will unlock. But, `pgstes` will not clear.
So, the next iteration attempts to acquire the lock at index `i`. If it fails, it may not unlock anything if `pgstes[i].pcl` is zero, even though it was previously acquired and unlocked in a prior iteration of the outer loop! That is a serious bug, and I need to verify that `pgste_set_unlock` correctly clears the internal state.
|
| 62/3 | 2026/08/12 11:00 | tool | grepper |
0mArgs:{
"Expression": "pgste_set_unlock",
"PathPrefix": "arch/s390/kvm/"
}Results: {
"Output": "arch/s390/kvm/dat.c=233=static int dat_split_ste(struct kvm_s390_mmu_cache *mc, union pmd *pmdp, gfn_t gfn,\n--\narch/s390/kvm/dat.c-283-\t\t\t\tpgste = dat_save_storage_key_into_pgste(pt-\u003eptes[i], pgste);\narch/s390/kvm/dat.c:284:\t\t\t\tpgste_set_unlock(pt-\u003eptes + i, pgste);\narch/s390/kvm/dat.c-285-\t\t\t}\n--\narch/s390/kvm/dat.c=616=int dat_get_storage_key(union asce asce, gfn_t gfn, union skey *skey)\n--\narch/s390/kvm/dat.c-645-\tskey-\u003ec |= pgste.gc;\narch/s390/kvm/dat.c:646:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-647-\treturn 0;\n--\narch/s390/kvm/dat.c=656=int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gfn,\n--\narch/s390/kvm/dat.c-695-\tdat_update_ptep_sd(old, pgste, ptep);\narch/s390/kvm/dat.c:696:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-697-\treturn 0;\n--\narch/s390/kvm/dat.c=711=int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\n--\narch/s390/kvm/dat.c-757-\tdat_update_ptep_sd(old, pgste, ptep);\narch/s390/kvm/dat.c:758:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-759-\treturn rc;\n--\narch/s390/kvm/dat.c=762=int dat_reset_reference_bit(union asce asce, gfn_t gfn, union skey *skey)\n--\narch/s390/kvm/dat.c-794-\tdat_update_ptep_sd(old, pgste, ptep);\narch/s390/kvm/dat.c:795:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-796-\treturn 0;\n--\narch/s390/kvm/dat.c=799=static long dat_reset_skeys_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-809-\t\tpage_set_storage_key(pte_origin(*ptep), PAGE_DEFAULT_KEY, 1);\narch/s390/kvm/dat.c:810:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-811-\n--\narch/s390/kvm/dat.c=852=static long _dat_slot_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-867-\tpgste.cmma_d = 0;\narch/s390/kvm/dat.c:868:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-869-\n--\narch/s390/kvm/dat.c=911=int dat_set_slot(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t start, gfn_t end,\n--\narch/s390/kvm/dat.c-922-\narch/s390/kvm/dat.c:923:static void pgste_set_unlock_multiple(union pte *first, int n, union pgste *pgstes)\narch/s390/kvm/dat.c-924-{\n--\narch/s390/kvm/dat.c-927-\tfor (i = 0; i \u003c n; i++)\narch/s390/kvm/dat.c:928:\t\tpgste_set_unlock(first + i, pgstes[i]);\narch/s390/kvm/dat.c-929-}\n--\narch/s390/kvm/dat.c=931=static bool pgste_get_trylock_multiple(union pte *first, int n, union pgste *pgstes)\n--\narch/s390/kvm/dat.c-940-\t\treturn true;\narch/s390/kvm/dat.c:941:\tpgste_set_unlock_multiple(first, i, pgstes);\narch/s390/kvm/dat.c-942-\treturn false;\n--\narch/s390/kvm/dat.c=945=unsigned long dat_get_ptval(struct page_table *table, struct ptval_param param)\n--\narch/s390/kvm/dat.c-958-\narch/s390/kvm/dat.c:959:\tpgste_set_unlock_multiple(table-\u003eptes + param.offset, n, pgstes);\narch/s390/kvm/dat.c-960-\treturn res;\n--\narch/s390/kvm/dat.c=963=void dat_set_ptval(struct page_table *table, struct ptval_param param, unsigned long val)\n--\narch/s390/kvm/dat.c-977-\narch/s390/kvm/dat.c:978:\tpgste_set_unlock_multiple(table-\u003eptes + param.offset, n, pgstes);\narch/s390/kvm/dat.c-979-}\n--\narch/s390/kvm/dat.c=1031=static long dat_set_pn_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-1040-\t}\narch/s390/kvm/dat.c:1041:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-1042-\treturn 0;\n--\narch/s390/kvm/dat.c=1076=int dat_perform_essa(union asce asce, gfn_t gfn, int orc, union essa_state *state, bool *dirty)\n--\narch/s390/kvm/dat.c-1151-\narch/s390/kvm/dat.c:1152:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-1153-\n--\narch/s390/kvm/dat.c=1157=static long dat_reset_cmma_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-1164-\tpgste.cmma_d = 0;\narch/s390/kvm/dat.c:1165:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-1166-\tif (need_resched())\n--\narch/s390/kvm/dat.c=1189=static long __dat_peek_cmma_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-1195-\tstate-\u003evalues[gfn - walk-\u003estart] = pgste.usage | (pgste.nodat \u003c\u003c 6);\narch/s390/kvm/dat.c:1196:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-1197-\tstate-\u003eend = next;\n--\narch/s390/kvm/dat.c=1229=static long __dat_get_cmma_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-1252-\t}\narch/s390/kvm/dat.c:1253:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-1254-\treturn 0;\n--\narch/s390/kvm/dat.c=1287=static long __dat_set_cmma_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/dat.c-1296-\tpgste.nodat = tmp.nodat;\narch/s390/kvm/dat.c:1297:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.c-1298-\n--\narch/s390/kvm/dat.h=866=static inline union pgste pgste_get_lock(union pte *ptep)\n--\narch/s390/kvm/dat.h-874-\narch/s390/kvm/dat.h:875:static inline void pgste_set_unlock(union pte *ptep, union pgste pgste)\narch/s390/kvm/dat.h-876-{\n--\narch/s390/kvm/dat.h=882=static inline void dat_ptep_xchg(union pte *ptep, union pte new, gfn_t gfn, union asce asce,\n--\narch/s390/kvm/dat.h-888-\tpgste = __dat_ptep_xchg(ptep, pgste, new, gfn, asce, has_skeys);\narch/s390/kvm/dat.h:889:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/dat.h-890-}\n--\narch/s390/kvm/gaccess.c=1422=static int _do_shadow_pte(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gpa_t raddr,\n--\narch/s390/kvm/gaccess.c-1449-\t}\narch/s390/kvm/gaccess.c:1450:\tpgste_set_unlock(ptep_h, pgste);\narch/s390/kvm/gaccess.c-1451-\tif (rc)\n--\narch/s390/kvm/gaccess.c-1459-\tpgste = __dat_ptep_xchg(ptep, pgste, newpte, gpa_to_gfn(raddr), sg-\u003easce, uses_skeys(sg));\narch/s390/kvm/gaccess.c:1460:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gaccess.c-1461-\n--\narch/s390/kvm/gmap.c=287=static long gmap_clear_young_pte(union pte *ptep, gfn_t gfn, gfn_t end, struct dat_walk *walk)\n--\narch/s390/kvm/gmap.c-311-\tp-\u003eyoung = 1;\narch/s390/kvm/gmap.c:312:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gmap.c-313-\treturn 0;\n--\narch/s390/kvm/gmap.c=376=static long _gmap_unmap_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *w)\n--\narch/s390/kvm/gmap.c-390-\tpgste = gmap_ptep_xchg(priv-\u003egmap, ptep, _PTE_EMPTY, pgste, gfn);\narch/s390/kvm/gmap.c:391:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gmap.c-392-\tif (folio)\n--\narch/s390/kvm/gmap.c=482=static long _pte_test_and_clear_softdirty(union pte *ptep, gfn_t gfn, gfn_t end,\n--\narch/s390/kvm/gmap.c-489-\tpgste = __pte_test_and_clear_softdirty(ptep, pgste, gfn, gmap);\narch/s390/kvm/gmap.c:490:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gmap.c-491-\treturn 0;\n--\narch/s390/kvm/gmap.c=612=int gmap_try_fixup_minor(struct gmap *gmap, struct guest_fault *fault)\n--\narch/s390/kvm/gmap.c-629-\t\t\tfault-\u003ecallback(fault);\narch/s390/kvm/gmap.c:630:\t\tpgste_set_unlock(fault-\u003eptep, pgste);\narch/s390/kvm/gmap.c-631-\t} else {\n--\narch/s390/kvm/gmap.c=685=static int _gmap_link(struct kvm_s390_mmu_cache *mc, struct gmap *gmap, int level,\n--\narch/s390/kvm/gmap.c-716-\t\t}\narch/s390/kvm/gmap.c:717:\t\tpgste_set_unlock(f-\u003eptep, pgste);\narch/s390/kvm/gmap.c-718-\t} else {\n--\narch/s390/kvm/gmap.c=1063=int gmap_protect_rmap(struct kvm_s390_mmu_cache *mc, struct gmap *sg, gfn_t p_gfn, gfn_t r_gfn,\n--\narch/s390/kvm/gmap.c-1095-\tpgste.vsie_notif = 1;\narch/s390/kvm/gmap.c:1096:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gmap.c-1097-\n--\narch/s390/kvm/gmap.c=1101=static long __set_cmma_clean_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/gmap.c-1106-\tpgste.cmma_d = 0;\narch/s390/kvm/gmap.c:1107:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gmap.c-1108-\n--\narch/s390/kvm/gmap.c=1114=static long __set_cmma_dirty_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/gmap.c-1121-\tpgste.cmma_d = 1;\narch/s390/kvm/gmap.c:1122:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/gmap.c-1123-\n--\narch/s390/kvm/kvm-s390.c=5815=static long cmma_d_count_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n--\narch/s390/kvm/kvm-s390.c-5823-\t}\narch/s390/kvm/kvm-s390.c:5824:\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/kvm-s390.c-5825-\treturn 0;\n--\narch/s390/kvm/priv.c=1191=static void _essa_clear_cbrl(struct kvm_vcpu *vcpu, unsigned long *cbrl, int len)\n--\narch/s390/kvm/priv.c-1212-\t\t}\narch/s390/kvm/priv.c:1213:\t\tpgste_set_unlock(ptep, pgste);\narch/s390/kvm/priv.c-1214-\t}\n"
} |
| 63/3 | 2026/08/12 11:00 | llm | kmsan-evaluator |
0mModel:gemini-3.1-pro-preview Args: null Results: null Tokens: input: 36978 output: 367 thoughts: 1279 Thoughts: **Analyzing the Patch: Uninitialized Memory and Locking Bugs**
Okay, let's break this down. My initial focus was on the function `pgste_set_unlock`. I realized it modifies the value pointed to by `ptep`, but *doesn't* actually change the `pgste` variable in the caller's array because it's passed by value. So, in the original code, if `pgste_get_trylock_multiple` failed, and then called `pgste_set_unlock_multiple`, there's a potential double-unlock or unlock-unheld lock condition. This is because the caller's array wasn't updated, and a stale `pcl` value might lead to unlocking a lock the process doesn't own. Thankfully, this class of bug is something that LOCKDEP or KASAN would pick up if it led to memory corruption, so that's good.
However, the real issue, and where this patch shines, is the uninitialized memory leak. It's in `dat_cond_set_storage_key`. Specifically, when `ptep` is not NULL and its `h.i` bit is set, the local variable `prev` (of type `union skey`) is only partially initialized. The `reserved` bitfield isn't set. Then, this partially initialized `prev` is copied to `*oldkey`. In `handle_sske`, `oldkey.skey` gets bitwise ORed into a guest's register, which is mapped to userspace. So, that uninitialized bit in the `reserved` bitfield leaks kernel stack memory to userspace. KMSAN, with its keen sense for detecting uninitialized memory use and info-leaks, is the appropriate tool here. KASAN, LOCKDEP, and the usual suspects wouldn't catch it because no memory access or corruption issues are present. The fix, setting `prev.skey = 0;`, zeroes the entire union.
Let's confirm that fix:
```c
pgste.fp = skey.fp;
pgste.gc = skey.c;
pgste.gr = skey.r;
+ prev.skey = 0;
if (!ptep->h.i) {
```
Yup. That clears the whole union, including the `reserved` bit. And then:
```c
} else {
prev.acc = old.acc;
prev.fp = old.fp;
prev.c = old.gc;
prev.r = old.gr;
}
if (oldkey)
*oldkey = prev;
```
Now, all the bitfields of `prev` get set, but the previously zeroed `reserved` bit stays 0. Then, `*oldkey = prev;` copies that all-zeroed `reserved` value to oldkey. Perfect! This fixes the leak.
So, `NeedsKMSAN = true` is absolutely the correct call here, considering the kernel stack information leak, as well as the other issues the patch addresses.
|
| 64/3 | 2026/08/12 11:01 | tool | set-results |
0mArgs:{
"KMSANReasoning": "The patch fixes an uninitialized memory info-leak in `dat_cond_set_storage_key()`. When `ptep != NULL` and `ptep-\u003eh.i == true`, the local stack variable `prev` (of type `union skey`) is only partially initialized: its bitfields (`acc`, `fp`, `c`, `r`) are set, but the `reserved` bit is left uninitialized. This partially uninitialized byte is then copied to `*oldkey`. In `handle_sske()`, `oldkey.skey` is bitwise ORed into the guest's general purpose register (`vcpu-\u003erun-\u003es.regs.gprs[reg1]`). Since `vcpu-\u003erun` is shared with userspace (e.g., QEMU), this leaks 1 bit of uninitialized kernel stack memory to userspace.\n\nKMSAN is specifically designed to detect uses of uninitialized memory and kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and UBSAN cannot detect this issue because there is no out-of-bounds access, invalid free, or locking violation involved in this specific path. The patch fixes this by explicitly initializing `prev.skey = 0;`.\n\n(Note: The patch also fixes a NULL pointer dereference in `handle_pfmf` and locking bugs in `pgste_set_unlock_multiple` and `kvm_s390_set_irq_state`, which would be caught by KASAN and LOCKDEP. However, the uninitialized stack memory leak strictly requires KMSAN).",
"NeedsKMSAN": true
}Results: {
"KMSANReasoning": "The patch fixes an uninitialized memory info-leak in `dat_cond_set_storage_key()`. When `ptep != NULL` and `ptep-\u003eh.i == true`, the local stack variable `prev` (of type `union skey`) is only partially initialized: its bitfields (`acc`, `fp`, `c`, `r`) are set, but the `reserved` bit is left uninitialized. This partially uninitialized byte is then copied to `*oldkey`. In `handle_sske()`, `oldkey.skey` is bitwise ORed into the guest's general purpose register (`vcpu-\u003erun-\u003es.regs.gprs[reg1]`). Since `vcpu-\u003erun` is shared with userspace (e.g., QEMU), this leaks 1 bit of uninitialized kernel stack memory to userspace.\n\nKMSAN is specifically designed to detect uses of uninitialized memory and kernel-to-user info-leaks. Standard KASAN, LOCKDEP, and UBSAN cannot detect this issue because there is no out-of-bounds access, invalid free, or locking violation involved in this specific path. The patch fixes this by explicitly initializing `prev.skey = 0;`.\n\n(Note: The patch also fixes a NULL pointer dereference in `handle_pfmf` and locking bugs in `pgste_set_unlock_multiple` and `kvm_s390_set_irq_state`, which would be caught by KASAN and LOCKDEP. However, the uninitialized stack memory leak strictly requires KMSAN).",
"NeedsKMSAN": true
} |
| Total Calls | Total Tokens | Avg Tokens | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|
| Total Calls | Total Duration (Seconds) | Avg Duration (Seconds) |
|---|