AI Trajectory

null

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "kvm_arch_vm_ioctl",
    "kvm_arch_vcpu_ioctl",
    "kvm_arch_vcpu_ioctl_run",
    "kvm_arch_vcpu_create",
    "kvm_arch_commit_memory_region",
    "kvm_s390_handle_b2",
    "kvm_s390_handle_b9"
  ],
  "Reasoning": "The patch modifies core KVM logic on s390, including memory region commit, VCPU creation/run/ioctl, PV CPU creation/destruction, and instruction interception handling (RRBE, ESSA, MVPG). These changes are reachable via KVM ioctls and guest instruction execution.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 05d684413cae8e10946f60e17f3c8e8c5cd7a218\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Jul 30 00:41:29 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h\nindex eaa34c5bd3c11..edf75b6ad20ce 100644\n--- a/arch/s390/include/asm/kvm_host.h\n+++ b/arch/s390/include/asm/kvm_host.h\n@@ -440,6 +440,7 @@ struct kvm_vcpu_arch {\n \tbool skey_enabled;\n \t/* Indicator if the access registers have been loaded from guest */\n \tbool acrs_loaded;\n+\tbool initialized;\n \tstruct kvm_s390_pv_vcpu pv;\n \tunion diag318_info diag318_info;\n \tstruct kvm_s390_mmu_cache *mc;\ndiff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c\nindex ed4259d176295..3f2d6e8902d76 100644\n--- a/arch/s390/kvm/dat.c\n+++ b/arch/s390/kvm/dat.c\n@@ -755,13 +755,15 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf\n \treturn rc;\n }\n \n-int dat_reset_reference_bit(union asce asce, gfn_t gfn)\n+int dat_reset_reference_bit(union asce asce, gfn_t gfn, union skey *skey)\n {\n \tunion pgste pgste, old;\n \tunion crste *crstep;\n \tunion pte *ptep;\n \tint rc;\n \n+\tskey-\u003eskey = 0;\n+\n \trc = dat_entry_walk(NULL, gfn, asce, DAT_WALK_ANY, TABLE_TYPE_PAGE_TABLE, \u0026crstep, \u0026ptep);\n \tif (rc)\n \t\treturn rc;\n@@ -771,21 +773,23 @@ int dat_reset_reference_bit(union asce asce, gfn_t gfn)\n \n \t\tif (!crste.h.fc || !crste.s.fc1.pr)\n \t\t\treturn 0;\n-\t\treturn page_reset_referenced(large_crste_to_phys(*crstep, gfn));\n+\t\tskey-\u003eskey = page_reset_referenced(large_crste_to_phys(*crstep, gfn)) \u003c\u003c 1;\n+\t\treturn 0;\n \t}\n \told = pgste_get_lock(ptep);\n \tpgste = old;\n \n \tif (!ptep-\u003eh.i) {\n-\t\trc = page_reset_referenced(pte_origin(*ptep));\n-\t\tpgste.hr = rc \u003e\u003e 1;\n+\t\tskey-\u003eskey = page_reset_referenced(pte_origin(*ptep)) \u003c\u003c 1;\n+\t\tpgste.hr = skey-\u003er;\n \t}\n-\trc |= (pgste.gr \u003c\u003c 1) | pgste.gc;\n+\tskey-\u003er |= pgste.gr;\n+\tskey-\u003ec |= pgste.gc;\n \tpgste.gr = 0;\n \n \tdat_update_ptep_sd(old, pgste, ptep);\n \tpgste_set_unlock(ptep, pgste);\n-\treturn rc;\n+\treturn 0;\n }\n \n static long dat_reset_skeys_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n@@ -846,6 +850,7 @@ static long _dat_slot_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_wal\n \tstruct slot_priv *p = walk-\u003epriv;\n \tunion crste dummy = { .val = p-\u003etoken };\n \tunion pte new_pte, pte = READ_ONCE(*ptep);\n+\tunion pgste pgste;\n \n \tnew_pte = _PTE_TOK(dummy.tok.type, dummy.tok.par);\n \n@@ -853,7 +858,11 @@ static long _dat_slot_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_wal\n \tif (pte.val == new_pte.val)\n \t\treturn 0;\n \n-\tdat_ptep_xchg(ptep, new_pte, gfn, walk-\u003easce, false);\n+\tpgste = pgste_get_lock(ptep);\n+\tpgste = __dat_ptep_xchg(ptep, pgste, new_pte, gfn, walk-\u003easce, false);\n+\tpgste.cmma_d = 0;\n+\tpgste_set_unlock(ptep, pgste);\n+\n \treturn 0;\n }\n \ndiff --git a/arch/s390/kvm/dat.h b/arch/s390/kvm/dat.h\nindex fad605305e05c..141ee7b9f0191 100644\n--- a/arch/s390/kvm/dat.h\n+++ b/arch/s390/kvm/dat.h\n@@ -537,7 +537,7 @@ int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gf\n \t\t\tunion skey skey, bool nq);\n int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,\n \t\t\t     union skey skey, union skey *oldkey, bool nq, bool mr, bool mc);\n-int dat_reset_reference_bit(union asce asce, gfn_t gfn);\n+int dat_reset_reference_bit(union asce asce, gfn_t gfn, union skey *skey);\n long dat_reset_skeys(union asce asce, gfn_t start);\n \n unsigned long dat_get_ptval(struct page_table *table, struct ptval_param param);\ndiff --git a/arch/s390/kvm/faultin.c b/arch/s390/kvm/faultin.c\nindex fee80047bd94f..4ff4c59709566 100644\n--- a/arch/s390/kvm/faultin.c\n+++ b/arch/s390/kvm/faultin.c\n@@ -92,8 +92,8 @@ int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fa\n \t\tif (is_noslot_pfn(f-\u003epfn))\n \t\t\treturn PGM_ADDRESSING;\n \t\t/* Signal pending: try again. */\n-\t\tif (f-\u003epfn == KVM_PFN_ERR_SIGPENDING)\n-\t\t\treturn -EAGAIN;\n+\t\tif (is_sigpending_pfn(f-\u003epfn))\n+\t\t\treturn -EINTR;\n \t\t/* Check if it's read-only memory; don't try to actually handle that case. */\n \t\tif (f-\u003epfn == KVM_PFN_ERR_RO_FAULT)\n \t\t\treturn -EOPNOTSUPP;\ndiff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c\nindex 1980df61ef304..a40fe2a10cbfe 100644\n--- a/arch/s390/kvm/intercept.c\n+++ b/arch/s390/kvm/intercept.c\n@@ -369,27 +369,30 @@ static int handle_mvpg_pei(struct kvm_vcpu *vcpu)\n \tif (rc)\n \t\treturn kvm_s390_inject_prog_cond(vcpu, rc);\n \n-\tdo {\n-\t\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(srcaddr), false);\n-\t} while (rc == -EAGAIN);\n-\tif (rc)\n-\t\treturn rc;\n-\n-\t/* Ensure that the source is paged-in, no actual access -\u003e no key checking */\n+\t/* Ensure that the destination is paged-in, no actual access -\u003e no key checking */\n \trc = guest_translate_address_with_key(vcpu, vcpu-\u003erun-\u003es.regs.gprs[reg1],\n \t\t\t\t\t      reg1, \u0026dstaddr, GACC_STORE, 0);\n \tif (rc)\n \t\treturn kvm_s390_inject_prog_cond(vcpu, rc);\n \n+\t/*\n+\t * If an error happens below, the instruction needs to be retried.\n+\t * Positive error codes are impossible; addressing exceptions would\n+\t * have been discovered and reported above.\n+\t */\n+\tkvm_s390_retry_instr(vcpu);\n+\n \tdo {\n-\t\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(dstaddr), true);\n+\t\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(srcaddr), false);\n \t} while (rc == -EAGAIN);\n \tif (rc)\n \t\treturn rc;\n \n-\tkvm_s390_retry_instr(vcpu);\n+\tdo {\n+\t\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(dstaddr), true);\n+\t} while (rc == -EAGAIN);\n \n-\treturn 0;\n+\treturn rc;\n }\n \n static int handle_partial_execution(struct kvm_vcpu *vcpu)\ndiff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c\nindex 9e3e6b0d72ad6..8d146a0681dce 100644\n--- a/arch/s390/kvm/interrupt.c\n+++ b/arch/s390/kvm/interrupt.c\n@@ -84,10 +84,13 @@ static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)\n static void sca_clear_ext_call(struct kvm_vcpu *vcpu)\n {\n \tstruct esca_block *sca = vcpu-\u003ekvm-\u003earch.sca;\n-\tunion esca_sigp_ctrl *sigp_ctrl = \u0026sca-\u003ecpu[vcpu-\u003evcpu_id].sigp_ctrl;\n+\tunion esca_sigp_ctrl *sigp_ctrl;\n \n-\tif (!kvm_s390_use_sca_entries())\n+\tif (!kvm_s390_use_sca_entries() || !vcpu-\u003earch.initialized || kvm_is_ucontrol(vcpu-\u003ekvm))\n \t\treturn;\n+\n+\t/* Initialize after the above check, to prevent going out of bounds */\n+\tsigp_ctrl = \u0026sca-\u003ecpu[vcpu-\u003evcpu_id].sigp_ctrl;\n \tkvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);\n \n \tWRITE_ONCE(sigp_ctrl-\u003evalue, 0);\ndiff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c\nindex 150b5dd2170e2..84c6f77e9fc93 100644\n--- a/arch/s390/kvm/kvm-s390.c\n+++ b/arch/s390/kvm/kvm-s390.c\n@@ -571,7 +571,7 @@ static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op\n \tswitch (op) {\n \tcase KVM_S390_KEYOP_SSKE:\n \t\tr = dat_cond_set_storage_key(mc, asce, gfn, skey, \u0026skey, 0, 0, 0);\n-\t\tif (r \u003e= 0)\n+\t\tif (r == 0 || r == 1)\n \t\t\treturn skey.skey;\n \t\tbreak;\n \tcase KVM_S390_KEYOP_ISKE:\n@@ -580,14 +580,14 @@ static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op\n \t\t\treturn skey.skey;\n \t\tbreak;\n \tcase KVM_S390_KEYOP_RRBE:\n-\t\tr = dat_reset_reference_bit(asce, gfn);\n-\t\tif (r \u003e 0)\n-\t\t\treturn r \u003c\u003c 1;\n+\t\tr = dat_reset_reference_bit(asce, gfn, \u0026skey);\n+\t\tif (!r)\n+\t\t\treturn skey.skey;\n \t\tbreak;\n \tdefault:\n \t\treturn -EINVAL;\n \t}\n-\treturn r;\n+\treturn r \u003e 0 ? -EFAULT : r;\n }\n \n /* Section: device related */\n@@ -1300,7 +1300,9 @@ static int kvm_s390_vm_set_migration(struct kvm *kvm,\n {\n \tint res = -ENXIO;\n \n-\tmutex_lock(\u0026kvm-\u003eslots_lock);\n+\tguard(srcu)(\u0026kvm-\u003esrcu);\n+\tguard(mutex)(\u0026kvm-\u003eslots_arch_lock);\n+\n \tswitch (attr-\u003eattr) {\n \tcase KVM_S390_VM_MIGRATION_START:\n \t\tres = kvm_s390_vm_start_migration(kvm);\n@@ -1311,7 +1313,6 @@ static int kvm_s390_vm_set_migration(struct kvm *kvm,\n \tdefault:\n \t\tbreak;\n \t}\n-\tmutex_unlock(\u0026kvm-\u003eslots_lock);\n \n \treturn res;\n }\n@@ -2214,7 +2215,7 @@ static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\n \t}\n \n \tkvfree(keys);\n-\treturn r;\n+\treturn r \u003c= 0 ? r : -EFAULT;\n }\n \n static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\n@@ -2276,7 +2277,7 @@ static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\n \tkvm_s390_free_mmu_cache(mc);\n out:\n \tkvfree(keys);\n-\treturn r;\n+\treturn r \u003c= 0 ? r : -EFAULT;\n }\n \n /*\n@@ -2386,7 +2387,7 @@ static int kvm_s390_set_cmma_bits(struct kvm *kvm,\n \n \tset_bit(GMAP_FLAG_USES_CMM, \u0026kvm-\u003earch.gmap-\u003eflags);\n \n-\treturn r;\n+\treturn r \u003c= 0 ? r : -EFAULT;\n }\n \n /**\n@@ -2998,9 +2999,8 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n \t\tr = -EFAULT;\n \t\tif (copy_from_user(\u0026args, argp, sizeof(args)))\n \t\t\tbreak;\n-\t\tmutex_lock(\u0026kvm-\u003eslots_lock);\n-\t\tr = kvm_s390_get_cmma_bits(kvm, \u0026args);\n-\t\tmutex_unlock(\u0026kvm-\u003eslots_lock);\n+\t\tscoped_guard(mutex, \u0026kvm-\u003eslots_arch_lock)\n+\t\t\tr = kvm_s390_get_cmma_bits(kvm, \u0026args);\n \t\tif (!r) {\n \t\t\tr = copy_to_user(argp, \u0026args, sizeof(args));\n \t\t\tif (r)\n@@ -3014,9 +3014,9 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n \t\tr = -EFAULT;\n \t\tif (copy_from_user(\u0026args, argp, sizeof(args)))\n \t\t\tbreak;\n-\t\tmutex_lock(\u0026kvm-\u003eslots_lock);\n+\t\tmutex_lock(\u0026kvm-\u003eslots_arch_lock);\n \t\tr = kvm_s390_set_cmma_bits(kvm, \u0026args);\n-\t\tmutex_unlock(\u0026kvm-\u003eslots_lock);\n+\t\tmutex_unlock(\u0026kvm-\u003eslots_arch_lock);\n \t\tbreak;\n \t}\n \tcase KVM_S390_PV_COMMAND: {\n@@ -3461,7 +3461,7 @@ static void sca_del_vcpu(struct kvm_vcpu *vcpu)\n {\n \tstruct esca_block *sca = vcpu-\u003ekvm-\u003earch.sca;\n \n-\tif (!kvm_s390_use_sca_entries())\n+\tif (!kvm_s390_use_sca_entries() || !vcpu-\u003earch.initialized)\n \t\treturn;\n \n \tclear_bit_inv(vcpu-\u003evcpu_id, (unsigned long *)sca-\u003emcn);\n@@ -3481,8 +3481,8 @@ static void sca_add_vcpu(struct kvm_vcpu *vcpu)\n \tif (!kvm_s390_use_sca_entries())\n \t\treturn;\n \n+\tWRITE_ONCE(sca-\u003ecpu[vcpu-\u003evcpu_id].sda, virt_to_phys(vcpu-\u003earch.sie_block));\n \tset_bit_inv(vcpu-\u003evcpu_id, (unsigned long *)sca-\u003emcn);\n-\tsca-\u003ecpu[vcpu-\u003evcpu_id].sda = virt_to_phys(vcpu-\u003earch.sie_block);\n }\n \n static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)\n@@ -3613,6 +3613,9 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)\n \tif (test_kvm_facility(vcpu-\u003ekvm, 74) || vcpu-\u003ekvm-\u003earch.user_instr0 ||\n \t    vcpu-\u003ekvm-\u003earch.user_operexec)\n \t\tvcpu-\u003earch.sie_block-\u003eictl |= ICTL_OPEREXC;\n+\n+\t/* Pairs with smp_load_acquire() in kvm_arch_vcpu_ioctl_run() and kvm_arch_vcpu_ioctl() */\n+\tsmp_store_release(\u0026vcpu-\u003earch.initialized, true);\n }\n \n static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)\n@@ -3674,7 +3677,8 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)\n \n void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)\n {\n-\tfree_page((unsigned long)phys_to_virt(vcpu-\u003earch.sie_block-\u003ecbrlo));\n+\tif (vcpu-\u003earch.sie_block-\u003ecbrlo)\n+\t\tfree_page((unsigned long)phys_to_virt(vcpu-\u003earch.sie_block-\u003ecbrlo));\n \tvcpu-\u003earch.sie_block-\u003ecbrlo = 0;\n }\n \n@@ -3792,21 +3796,21 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)\n \treturn 0;\n }\n \n+DEFINE_FREE(sie_page, struct sie_page *, if (_T) free_page((unsigned long)(_T)))\n+\n int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\n {\n-\tstruct sie_page *sie_page;\n+\tstruct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL;\n+\tstruct sie_page *sie_page __free(sie_page) = NULL;\n \tint rc;\n \n \tBUILD_BUG_ON(sizeof(struct sie_page) != 4096);\n-\tvcpu-\u003earch.mc = kvm_s390_new_mmu_cache();\n-\tif (!vcpu-\u003earch.mc)\n+\tmc = kvm_s390_new_mmu_cache();\n+\tif (!mc)\n \t\treturn -ENOMEM;\n \tsie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);\n-\tif (!sie_page) {\n-\t\tkvm_s390_free_mmu_cache(vcpu-\u003earch.mc);\n-\t\tvcpu-\u003earch.mc = NULL;\n+\tif (!sie_page)\n \t\treturn -ENOMEM;\n-\t}\n \n \tvcpu-\u003earch.sie_block = \u0026sie_page-\u003esie_block;\n \tvcpu-\u003earch.sie_block-\u003eitdba = virt_to_phys(\u0026sie_page-\u003eitdb);\n@@ -3848,10 +3852,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\n \t\tvcpu-\u003erun-\u003ekvm_valid_regs |= KVM_SYNC_FPRS;\n \n \tif (kvm_is_ucontrol(vcpu-\u003ekvm)) {\n-\t\trc = -ENOMEM;\n \t\tvcpu-\u003earch.gmap = gmap_new_child(vcpu-\u003ekvm-\u003earch.gmap, -1UL);\n \t\tif (!vcpu-\u003earch.gmap)\n-\t\t\tgoto out_free_sie_block;\n+\t\t\treturn -ENOMEM;\n \t}\n \n \tVM_EVENT(vcpu-\u003ekvm, 3, \"create cpu %d at 0x%p, sie block at 0x%p\",\n@@ -3859,20 +3862,19 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\n \ttrace_kvm_s390_create_vcpu(vcpu-\u003evcpu_id, vcpu, vcpu-\u003earch.sie_block);\n \n \trc = kvm_s390_vcpu_setup(vcpu);\n-\tif (rc)\n-\t\tgoto out_ucontrol_uninit;\n+\tif (rc) {\n+\t\tif (kvm_is_ucontrol(vcpu-\u003ekvm)) {\n+\t\t\tscoped_guard(spinlock, \u0026vcpu-\u003ekvm-\u003earch.gmap-\u003echildren_lock)\n+\t\t\t\tgmap_remove_child(vcpu-\u003earch.gmap);\n+\t\t\tvcpu-\u003earch.gmap = gmap_put(vcpu-\u003earch.gmap);\n+\t\t}\n+\t\treturn rc;\n+\t}\n \n+\tvcpu-\u003earch.mc = no_free_ptr(mc);\n+\tsie_page = NULL;\n \tkvm_s390_update_topology_change_report(vcpu-\u003ekvm, 1);\n \treturn 0;\n-\n-out_ucontrol_uninit:\n-\tif (kvm_is_ucontrol(vcpu-\u003ekvm)) {\n-\t\tgmap_remove_child(vcpu-\u003earch.gmap);\n-\t\tvcpu-\u003earch.gmap = gmap_put(vcpu-\u003earch.gmap);\n-\t}\n-out_free_sie_block:\n-\tfree_page((unsigned long)(vcpu-\u003earch.sie_block));\n-\treturn rc;\n }\n \n int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)\n@@ -5039,6 +5041,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\n \t    kvm_run-\u003ekvm_dirty_regs \u0026 ~KVM_SYNC_S390_VALID_FIELDS)\n \t\treturn -EINVAL;\n \n+\t/* Pairs with smp_store_release() in kvm_arch_vcpu_postcreate() */\n+\tif (!smp_load_acquire(\u0026vcpu-\u003earch.initialized))\n+\t\treturn -EINVAL;\n+\n \tvcpu_load(vcpu);\n \n \tif (guestdbg_exit_pending(vcpu)) {\n@@ -5523,6 +5529,10 @@ long kvm_arch_vcpu_ioctl(struct file *filp,\n \tlong r;\n \tu16 rc, rrc;\n \n+\t/* Pairs with smp_store_release() in kvm_arch_vcpu_postcreate() */\n+\tif (!smp_load_acquire(\u0026vcpu-\u003earch.initialized))\n+\t\treturn -EINVAL;\n+\n \tvcpu_load(vcpu);\n \n \tswitch (ioctl) {\n@@ -5794,24 +5804,38 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,\n \treturn 0;\n }\n \n+static long cmma_d_count_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)\n+{\n+\tif (pgste_of(ptep)-\u003ecmma_d)\n+\t\tatomic64_dec(walk-\u003epriv);\n+\treturn 0;\n+}\n+\n void kvm_arch_commit_memory_region(struct kvm *kvm,\n \t\t\t\tstruct kvm_memory_slot *old,\n \t\t\t\tconst struct kvm_memory_slot *new,\n \t\t\t\tenum kvm_mr_change change)\n {\n-\tstruct kvm_s390_mmu_cache *mc = NULL;\n-\tint rc = 0;\n+\tconst struct dat_walk_ops ops = { .pte_entry = cmma_d_count_pte, };\n+\tstruct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL;\n+\tint rc = -ENOMEM;\n+\n+\tguard(mutex)(\u0026kvm-\u003eslots_arch_lock);\n \n \tif (change == KVM_MR_FLAGS_ONLY)\n \t\treturn;\n \n \tmc = kvm_s390_new_mmu_cache();\n-\tif (!mc) {\n-\t\trc = -ENOMEM;\n+\tif (!mc)\n \t\tgoto out;\n-\t}\n-\n+retry:\n \tscoped_guard(write_lock, \u0026kvm-\u003emmu_lock) {\n+\t\tif (kvm-\u003earch.migration_mode \u0026\u0026 kvm-\u003earch.use_cmma \u0026\u0026 old) {\n+\t\t\t_dat_walk_gfn_range(old-\u003ebase_gfn, old-\u003ebase_gfn + old-\u003enpages,\n+\t\t\t\t\t    kvm-\u003earch.gmap-\u003easce, \u0026ops, DAT_WALK_IGN_HOLES,\n+\t\t\t\t\t    \u0026kvm-\u003earch.cmma_dirty_pages);\n+\t\t}\n+\n \t\tswitch (change) {\n \t\tcase KVM_MR_DELETE:\n \t\t\trc = dat_delete_slot(mc, kvm-\u003earch.gmap-\u003easce, old-\u003ebase_gfn, old-\u003enpages);\n@@ -5827,13 +5851,18 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,\n \t\tcase KVM_MR_FLAGS_ONLY:\n \t\t\tbreak;\n \t\tdefault:\n+\t\t\trc = 0;\n \t\t\tWARN(1, \"Unknown KVM MR CHANGE: %d\\n\", change);\n \t\t}\n \t}\n+\tif (rc == -ENOMEM) {\n+\t\trc = kvm_s390_mmu_cache_topup(mc);\n+\t\tif (!rc)\n+\t\t\tgoto retry;\n+\t}\n out:\n-\tif (rc)\n+\tif (KVM_BUG_ON(rc, kvm))\n \t\tpr_warn(\"failed to commit memory region\\n\");\n-\tkvm_s390_free_mmu_cache(mc);\n \treturn;\n }\n \ndiff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c\nindex ad0ddc433a73c..b1ba24c346efa 100644\n--- a/arch/s390/kvm/priv.c\n+++ b/arch/s390/kvm/priv.c\n@@ -289,6 +289,7 @@ static int handle_iske(struct kvm_vcpu *vcpu)\n static int handle_rrbe(struct kvm_vcpu *vcpu)\n {\n \tunsigned long gaddr;\n+\tunion skey skey;\n \tint reg1, reg2;\n \tint rc;\n \n@@ -307,12 +308,12 @@ static int handle_rrbe(struct kvm_vcpu *vcpu)\n \tgaddr = kvm_s390_logical_to_effective(vcpu, gaddr);\n \tgaddr = kvm_s390_real_to_abs(vcpu, gaddr);\n \tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock)\n-\t\trc = dat_reset_reference_bit(vcpu-\u003earch.gmap-\u003easce, gpa_to_gfn(gaddr));\n+\t\trc = dat_reset_reference_bit(vcpu-\u003earch.gmap-\u003easce, gpa_to_gfn(gaddr), \u0026skey);\n \tif (rc \u003e 0)\n \t\treturn kvm_s390_inject_program_int(vcpu, rc);\n \tif (rc \u003c 0)\n \t\treturn rc;\n-\tkvm_s390_set_psw_cc(vcpu, rc);\n+\tkvm_s390_set_psw_cc(vcpu, (skey.skey \u003e\u003e 1) \u0026 3);\n \treturn 0;\n }\n \n@@ -1260,8 +1261,9 @@ static int handle_essa(struct kvm_vcpu *vcpu)\n \t\t/* Retry the ESSA instruction */\n \t\tkvm_s390_retry_instr(vcpu);\n \t} else {\n-\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock)\n-\t\t\ti = __do_essa(vcpu, orc);\n+\t\tscoped_guard(mutex, \u0026vcpu-\u003ekvm-\u003eslots_arch_lock)\n+\t\t\tscoped_guard(read_lock, \u0026vcpu-\u003ekvm-\u003emmu_lock)\n+\t\t\t\ti = __do_essa(vcpu, orc);\n \t\tif (i \u003c 0)\n \t\t\treturn i;\n \t\t/* Account for the possible extra cbrl entry */\ndiff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c\nindex 1beacc841ca85..b02e0159d3cd2 100644\n--- a/arch/s390/kvm/pv.c\n+++ b/arch/s390/kvm/pv.c\n@@ -244,6 +244,24 @@ static void kvm_s390_clear_pv_state(struct kvm *kvm)\n \tkvm-\u003earch.pv.stor_var = NULL;\n }\n \n+static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)\n+{\n+\tif (free_stor_base)\n+\t\tfree_pages(vcpu-\u003earch.pv.stor_base, get_order(uv_info.guest_cpu_stor_len));\n+\tfree_page((unsigned long)sida_addr(vcpu-\u003earch.sie_block));\n+\tvcpu-\u003earch.sie_block-\u003epv_handle_cpu = 0;\n+\tvcpu-\u003earch.sie_block-\u003epv_handle_config = 0;\n+\tmemset(\u0026vcpu-\u003earch.pv, 0, sizeof(vcpu-\u003earch.pv));\n+\tvcpu-\u003earch.sie_block-\u003esdf = 0;\n+\t/*\n+\t * The sidad field (for sdf == 2) is now the gbea field (for sdf == 0).\n+\t * Use the reset value of gbea to avoid leaking the kernel pointer of\n+\t * the just freed sida.\n+\t */\n+\tvcpu-\u003earch.sie_block-\u003egbea = 1;\n+\tkvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);\n+}\n+\n int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n {\n \tint cc;\n@@ -258,24 +276,9 @@ int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n \tWARN_ONCE(cc, \"protvirt destroy cpu failed rc %x rrc %x\", *rc, *rrc);\n \n \t/* Intended memory leak for something that should never happen. */\n-\tif (!cc)\n-\t\tfree_pages(vcpu-\u003earch.pv.stor_base,\n-\t\t\t   get_order(uv_info.guest_cpu_stor_len));\n-\n-\tfree_page((unsigned long)sida_addr(vcpu-\u003earch.sie_block));\n-\tvcpu-\u003earch.sie_block-\u003epv_handle_cpu = 0;\n-\tvcpu-\u003earch.sie_block-\u003epv_handle_config = 0;\n-\tmemset(\u0026vcpu-\u003earch.pv, 0, sizeof(vcpu-\u003earch.pv));\n-\tvcpu-\u003earch.sie_block-\u003esdf = 0;\n-\t/*\n-\t * The sidad field (for sdf == 2) is now the gbea field (for sdf == 0).\n-\t * Use the reset value of gbea to avoid leaking the kernel pointer of\n-\t * the just freed sida.\n-\t */\n-\tvcpu-\u003earch.sie_block-\u003egbea = 1;\n-\tkvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);\n+\tkvm_s390_pv_dispose_cpu(vcpu, !cc);\n \n-\treturn cc ? EIO : 0;\n+\treturn cc ? -EIO : 0;\n }\n \n int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n@@ -319,9 +322,7 @@ int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n \t\t     uvcb.header.rrc);\n \n \tif (cc) {\n-\t\tu16 dummy;\n-\n-\t\tkvm_s390_pv_destroy_cpu(vcpu, \u0026dummy, \u0026dummy);\n+\t\tkvm_s390_pv_dispose_cpu(vcpu, true);\n \t\treturn -EIO;\n \t}\n \n@@ -809,7 +810,7 @@ static int unpack_one(struct kvm *kvm, unsigned long addr, u64 tweak,\n \t\t\treturn -EAGAIN;\n \t}\n \n-\tif (ret \u0026\u0026 ret != -EAGAIN)\n+\tif (ret \u0026\u0026 ret != -EAGAIN \u0026\u0026 ret != -EINTR)\n \t\tKVM_UV_EVENT(kvm, 3, \"PROTVIRT VM UNPACK: failed addr %llx with rc %x rrc %x\",\n \t\t\t     uvcb.gaddr, *rc, *rrc);\n \treturn ret;\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "kvm_arch_vm_ioctl",
    "kvm_arch_vcpu_ioctl",
    "kvm_arch_vcpu_ioctl_run",
    "kvm_arch_vcpu_create",
    "kvm_arch_commit_memory_region",
    "kvm_s390_handle_b2",
    "kvm_s390_handle_b9"
  ],
  "Reasoning": "The patch modifies core KVM logic on s390, including memory region commit, VCPU creation/run/ioctl, PV CPU creation/destruction, and instruction interception handling (RRBE, ESSA, MVPG). These changes are reachable via KVM ioctls and guest instruction execution.",
  "WorthFuzzing": true
}

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.

For your convenience, here is the diff of the changes:
commit 05d684413cae8e10946f60e17f3c8e8c5cd7a218
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Jul 30 00:41:29 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index eaa34c5bd3c11..edf75b6ad20ce 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -440,6 +440,7 @@ struct kvm_vcpu_arch {
 	bool skey_enabled;
 	/* Indicator if the access registers have been loaded from guest */
 	bool acrs_loaded;
+	bool initialized;
 	struct kvm_s390_pv_vcpu pv;
 	union diag318_info diag318_info;
 	struct kvm_s390_mmu_cache *mc;
diff --git a/arch/s390/kvm/dat.c b/arch/s390/kvm/dat.c
index ed4259d176295..3f2d6e8902d76 100644
--- a/arch/s390/kvm/dat.c
+++ b/arch/s390/kvm/dat.c
@@ -755,13 +755,15 @@ int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gf
 	return rc;
 }
 
-int dat_reset_reference_bit(union asce asce, gfn_t gfn)
+int dat_reset_reference_bit(union asce asce, gfn_t gfn, union skey *skey)
 {
 	union pgste pgste, old;
 	union crste *crstep;
 	union pte *ptep;
 	int rc;
 
+	skey->skey = 0;
+
 	rc = dat_entry_walk(NULL, gfn, asce, DAT_WALK_ANY, TABLE_TYPE_PAGE_TABLE, &crstep, &ptep);
 	if (rc)
 		return rc;
@@ -771,21 +773,23 @@ int dat_reset_reference_bit(union asce asce, gfn_t gfn)
 
 		if (!crste.h.fc || !crste.s.fc1.pr)
 			return 0;
-		return page_reset_referenced(large_crste_to_phys(*crstep, gfn));
+		skey->skey = page_reset_referenced(large_crste_to_phys(*crstep, gfn)) << 1;
+		return 0;
 	}
 	old = pgste_get_lock(ptep);
 	pgste = old;
 
 	if (!ptep->h.i) {
-		rc = page_reset_referenced(pte_origin(*ptep));
-		pgste.hr = rc >> 1;
+		skey->skey = page_reset_referenced(pte_origin(*ptep)) << 1;
+		pgste.hr = skey->r;
 	}
-	rc |= (pgste.gr << 1) | pgste.gc;
+	skey->r |= pgste.gr;
+	skey->c |= pgste.gc;
 	pgste.gr = 0;
 
 	dat_update_ptep_sd(old, pgste, ptep);
 	pgste_set_unlock(ptep, pgste);
-	return rc;
+	return 0;
 }
 
 static long dat_reset_skeys_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)
@@ -846,6 +850,7 @@ static long _dat_slot_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_wal
 	struct slot_priv *p = walk->priv;
 	union crste dummy = { .val = p->token };
 	union pte new_pte, pte = READ_ONCE(*ptep);
+	union pgste pgste;
 
 	new_pte = _PTE_TOK(dummy.tok.type, dummy.tok.par);
 
@@ -853,7 +858,11 @@ static long _dat_slot_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_wal
 	if (pte.val == new_pte.val)
 		return 0;
 
-	dat_ptep_xchg(ptep, new_pte, gfn, walk->asce, false);
+	pgste = pgste_get_lock(ptep);
+	pgste = __dat_ptep_xchg(ptep, pgste, new_pte, gfn, walk->asce, false);
+	pgste.cmma_d = 0;
+	pgste_set_unlock(ptep, pgste);
+
 	return 0;
 }
 
diff --git a/arch/s390/kvm/dat.h b/arch/s390/kvm/dat.h
index fad605305e05c..141ee7b9f0191 100644
--- a/arch/s390/kvm/dat.h
+++ b/arch/s390/kvm/dat.h
@@ -537,7 +537,7 @@ int dat_set_storage_key(struct kvm_s390_mmu_cache *mc, union asce asce, gfn_t gf
 			union skey skey, bool nq);
 int dat_cond_set_storage_key(struct kvm_s390_mmu_cache *mmc, union asce asce, gfn_t gfn,
 			     union skey skey, union skey *oldkey, bool nq, bool mr, bool mc);
-int dat_reset_reference_bit(union asce asce, gfn_t gfn);
+int dat_reset_reference_bit(union asce asce, gfn_t gfn, union skey *skey);
 long dat_reset_skeys(union asce asce, gfn_t start);
 
 unsigned long dat_get_ptval(struct page_table *table, struct ptval_param param);
diff --git a/arch/s390/kvm/faultin.c b/arch/s390/kvm/faultin.c
index fee80047bd94f..4ff4c59709566 100644
--- a/arch/s390/kvm/faultin.c
+++ b/arch/s390/kvm/faultin.c
@@ -92,8 +92,8 @@ int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fa
 		if (is_noslot_pfn(f->pfn))
 			return PGM_ADDRESSING;
 		/* Signal pending: try again. */
-		if (f->pfn == KVM_PFN_ERR_SIGPENDING)
-			return -EAGAIN;
+		if (is_sigpending_pfn(f->pfn))
+			return -EINTR;
 		/* Check if it's read-only memory; don't try to actually handle that case. */
 		if (f->pfn == KVM_PFN_ERR_RO_FAULT)
 			return -EOPNOTSUPP;
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 1980df61ef304..a40fe2a10cbfe 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -369,27 +369,30 @@ static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
 	if (rc)
 		return kvm_s390_inject_prog_cond(vcpu, rc);
 
-	do {
-		rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(srcaddr), false);
-	} while (rc == -EAGAIN);
-	if (rc)
-		return rc;
-
-	/* Ensure that the source is paged-in, no actual access -> no key checking */
+	/* Ensure that the destination is paged-in, no actual access -> no key checking */
 	rc = guest_translate_address_with_key(vcpu, vcpu->run->s.regs.gprs[reg1],
 					      reg1, &dstaddr, GACC_STORE, 0);
 	if (rc)
 		return kvm_s390_inject_prog_cond(vcpu, rc);
 
+	/*
+	 * If an error happens below, the instruction needs to be retried.
+	 * Positive error codes are impossible; addressing exceptions would
+	 * have been discovered and reported above.
+	 */
+	kvm_s390_retry_instr(vcpu);
+
 	do {
-		rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(dstaddr), true);
+		rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(srcaddr), false);
 	} while (rc == -EAGAIN);
 	if (rc)
 		return rc;
 
-	kvm_s390_retry_instr(vcpu);
+	do {
+		rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(dstaddr), true);
+	} while (rc == -EAGAIN);
 
-	return 0;
+	return rc;
 }
 
 static int handle_partial_execution(struct kvm_vcpu *vcpu)
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 9e3e6b0d72ad6..8d146a0681dce 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -84,10 +84,13 @@ static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
 {
 	struct esca_block *sca = vcpu->kvm->arch.sca;
-	union esca_sigp_ctrl *sigp_ctrl = &sca->cpu[vcpu->vcpu_id].sigp_ctrl;
+	union esca_sigp_ctrl *sigp_ctrl;
 
-	if (!kvm_s390_use_sca_entries())
+	if (!kvm_s390_use_sca_entries() || !vcpu->arch.initialized || kvm_is_ucontrol(vcpu->kvm))
 		return;
+
+	/* Initialize after the above check, to prevent going out of bounds */
+	sigp_ctrl = &sca->cpu[vcpu->vcpu_id].sigp_ctrl;
 	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
 
 	WRITE_ONCE(sigp_ctrl->value, 0);
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 150b5dd2170e2..84c6f77e9fc93 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -571,7 +571,7 @@ static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op
 	switch (op) {
 	case KVM_S390_KEYOP_SSKE:
 		r = dat_cond_set_storage_key(mc, asce, gfn, skey, &skey, 0, 0, 0);
-		if (r >= 0)
+		if (r == 0 || r == 1)
 			return skey.skey;
 		break;
 	case KVM_S390_KEYOP_ISKE:
@@ -580,14 +580,14 @@ static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op
 			return skey.skey;
 		break;
 	case KVM_S390_KEYOP_RRBE:
-		r = dat_reset_reference_bit(asce, gfn);
-		if (r > 0)
-			return r << 1;
+		r = dat_reset_reference_bit(asce, gfn, &skey);
+		if (!r)
+			return skey.skey;
 		break;
 	default:
 		return -EINVAL;
 	}
-	return r;
+	return r > 0 ? -EFAULT : r;
 }
 
 /* Section: device related */
@@ -1300,7 +1300,9 @@ static int kvm_s390_vm_set_migration(struct kvm *kvm,
 {
 	int res = -ENXIO;
 
-	mutex_lock(&kvm->slots_lock);
+	guard(srcu)(&kvm->srcu);
+	guard(mutex)(&kvm->slots_arch_lock);
+
 	switch (attr->attr) {
 	case KVM_S390_VM_MIGRATION_START:
 		res = kvm_s390_vm_start_migration(kvm);
@@ -1311,7 +1313,6 @@ static int kvm_s390_vm_set_migration(struct kvm *kvm,
 	default:
 		break;
 	}
-	mutex_unlock(&kvm->slots_lock);
 
 	return res;
 }
@@ -2214,7 +2215,7 @@ static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
 	}
 
 	kvfree(keys);
-	return r;
+	return r <= 0 ? r : -EFAULT;
 }
 
 static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
@@ -2276,7 +2277,7 @@ static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
 	kvm_s390_free_mmu_cache(mc);
 out:
 	kvfree(keys);
-	return r;
+	return r <= 0 ? r : -EFAULT;
 }
 
 /*
@@ -2386,7 +2387,7 @@ static int kvm_s390_set_cmma_bits(struct kvm *kvm,
 
 	set_bit(GMAP_FLAG_USES_CMM, &kvm->arch.gmap->flags);
 
-	return r;
+	return r <= 0 ? r : -EFAULT;
 }
 
 /**
@@ -2998,9 +2999,8 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		r = -EFAULT;
 		if (copy_from_user(&args, argp, sizeof(args)))
 			break;
-		mutex_lock(&kvm->slots_lock);
-		r = kvm_s390_get_cmma_bits(kvm, &args);
-		mutex_unlock(&kvm->slots_lock);
+		scoped_guard(mutex, &kvm->slots_arch_lock)
+			r = kvm_s390_get_cmma_bits(kvm, &args);
 		if (!r) {
 			r = copy_to_user(argp, &args, sizeof(args));
 			if (r)
@@ -3014,9 +3014,9 @@ int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
 		r = -EFAULT;
 		if (copy_from_user(&args, argp, sizeof(args)))
 			break;
-		mutex_lock(&kvm->slots_lock);
+		mutex_lock(&kvm->slots_arch_lock);
 		r = kvm_s390_set_cmma_bits(kvm, &args);
-		mutex_unlock(&kvm->slots_lock);
+		mutex_unlock(&kvm->slots_arch_lock);
 		break;
 	}
 	case KVM_S390_PV_COMMAND: {
@@ -3461,7 +3461,7 @@ static void sca_del_vcpu(struct kvm_vcpu *vcpu)
 {
 	struct esca_block *sca = vcpu->kvm->arch.sca;
 
-	if (!kvm_s390_use_sca_entries())
+	if (!kvm_s390_use_sca_entries() || !vcpu->arch.initialized)
 		return;
 
 	clear_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn);
@@ -3481,8 +3481,8 @@ static void sca_add_vcpu(struct kvm_vcpu *vcpu)
 	if (!kvm_s390_use_sca_entries())
 		return;
 
+	WRITE_ONCE(sca->cpu[vcpu->vcpu_id].sda, virt_to_phys(vcpu->arch.sie_block));
 	set_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn);
-	sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block);
 }
 
 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
@@ -3613,6 +3613,9 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
 	if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0 ||
 	    vcpu->kvm->arch.user_operexec)
 		vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
+
+	/* Pairs with smp_load_acquire() in kvm_arch_vcpu_ioctl_run() and kvm_arch_vcpu_ioctl() */
+	smp_store_release(&vcpu->arch.initialized, true);
 }
 
 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
@@ -3674,7 +3677,8 @@ static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
 
 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
 {
-	free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo));
+	if (vcpu->arch.sie_block->cbrlo)
+		free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo));
 	vcpu->arch.sie_block->cbrlo = 0;
 }
 
@@ -3792,21 +3796,21 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
 	return 0;
 }
 
+DEFINE_FREE(sie_page, struct sie_page *, if (_T) free_page((unsigned long)(_T)))
+
 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 {
-	struct sie_page *sie_page;
+	struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL;
+	struct sie_page *sie_page __free(sie_page) = NULL;
 	int rc;
 
 	BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
-	vcpu->arch.mc = kvm_s390_new_mmu_cache();
-	if (!vcpu->arch.mc)
+	mc = kvm_s390_new_mmu_cache();
+	if (!mc)
 		return -ENOMEM;
 	sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);
-	if (!sie_page) {
-		kvm_s390_free_mmu_cache(vcpu->arch.mc);
-		vcpu->arch.mc = NULL;
+	if (!sie_page)
 		return -ENOMEM;
-	}
 
 	vcpu->arch.sie_block = &sie_page->sie_block;
 	vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb);
@@ -3848,10 +3852,9 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 		vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
 
 	if (kvm_is_ucontrol(vcpu->kvm)) {
-		rc = -ENOMEM;
 		vcpu->arch.gmap = gmap_new_child(vcpu->kvm->arch.gmap, -1UL);
 		if (!vcpu->arch.gmap)
-			goto out_free_sie_block;
+			return -ENOMEM;
 	}
 
 	VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%p, sie block at 0x%p",
@@ -3859,20 +3862,19 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
 	trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
 
 	rc = kvm_s390_vcpu_setup(vcpu);
-	if (rc)
-		goto out_ucontrol_uninit;
+	if (rc) {
+		if (kvm_is_ucontrol(vcpu->kvm)) {
+			scoped_guard(spinlock, &vcpu->kvm->arch.gmap->children_lock)
+				gmap_remove_child(vcpu->arch.gmap);
+			vcpu->arch.gmap = gmap_put(vcpu->arch.gmap);
+		}
+		return rc;
+	}
 
+	vcpu->arch.mc = no_free_ptr(mc);
+	sie_page = NULL;
 	kvm_s390_update_topology_change_report(vcpu->kvm, 1);
 	return 0;
-
-out_ucontrol_uninit:
-	if (kvm_is_ucontrol(vcpu->kvm)) {
-		gmap_remove_child(vcpu->arch.gmap);
-		vcpu->arch.gmap = gmap_put(vcpu->arch.gmap);
-	}
-out_free_sie_block:
-	free_page((unsigned long)(vcpu->arch.sie_block));
-	return rc;
 }
 
 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
@@ -5039,6 +5041,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 	    kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
 		return -EINVAL;
 
+	/* Pairs with smp_store_release() in kvm_arch_vcpu_postcreate() */
+	if (!smp_load_acquire(&vcpu->arch.initialized))
+		return -EINVAL;
+
 	vcpu_load(vcpu);
 
 	if (guestdbg_exit_pending(vcpu)) {
@@ -5523,6 +5529,10 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
 	long r;
 	u16 rc, rrc;
 
+	/* Pairs with smp_store_release() in kvm_arch_vcpu_postcreate() */
+	if (!smp_load_acquire(&vcpu->arch.initialized))
+		return -EINVAL;
+
 	vcpu_load(vcpu);
 
 	switch (ioctl) {
@@ -5794,24 +5804,38 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 	return 0;
 }
 
+static long cmma_d_count_pte(union pte *ptep, gfn_t gfn, gfn_t next, struct dat_walk *walk)
+{
+	if (pgste_of(ptep)->cmma_d)
+		atomic64_dec(walk->priv);
+	return 0;
+}
+
 void kvm_arch_commit_memory_region(struct kvm *kvm,
 				struct kvm_memory_slot *old,
 				const struct kvm_memory_slot *new,
 				enum kvm_mr_change change)
 {
-	struct kvm_s390_mmu_cache *mc = NULL;
-	int rc = 0;
+	const struct dat_walk_ops ops = { .pte_entry = cmma_d_count_pte, };
+	struct kvm_s390_mmu_cache *mc __free(kvm_s390_mmu_cache) = NULL;
+	int rc = -ENOMEM;
+
+	guard(mutex)(&kvm->slots_arch_lock);
 
 	if (change == KVM_MR_FLAGS_ONLY)
 		return;
 
 	mc = kvm_s390_new_mmu_cache();
-	if (!mc) {
-		rc = -ENOMEM;
+	if (!mc)
 		goto out;
-	}
-
+retry:
 	scoped_guard(write_lock, &kvm->mmu_lock) {
+		if (kvm->arch.migration_mode && kvm->arch.use_cmma && old) {
+			_dat_walk_gfn_range(old->base_gfn, old->base_gfn + old->npages,
+					    kvm->arch.gmap->asce, &ops, DAT_WALK_IGN_HOLES,
+					    &kvm->arch.cmma_dirty_pages);
+		}
+
 		switch (change) {
 		case KVM_MR_DELETE:
 			rc = dat_delete_slot(mc, kvm->arch.gmap->asce, old->base_gfn, old->npages);
@@ -5827,13 +5851,18 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 		case KVM_MR_FLAGS_ONLY:
 			break;
 		default:
+			rc = 0;
 			WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
 		}
 	}
+	if (rc == -ENOMEM) {
+		rc = kvm_s390_mmu_cache_topup(mc);
+		if (!rc)
+			goto retry;
+	}
 out:
-	if (rc)
+	if (KVM_BUG_ON(rc, kvm))
 		pr_warn("failed to commit memory region\n");
-	kvm_s390_free_mmu_cache(mc);
 	return;
 }
 
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index ad0ddc433a73c..b1ba24c346efa 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -289,6 +289,7 @@ static int handle_iske(struct kvm_vcpu *vcpu)
 static int handle_rrbe(struct kvm_vcpu *vcpu)
 {
 	unsigned long gaddr;
+	union skey skey;
 	int reg1, reg2;
 	int rc;
 
@@ -307,12 +308,12 @@ static int handle_rrbe(struct kvm_vcpu *vcpu)
 	gaddr = kvm_s390_logical_to_effective(vcpu, gaddr);
 	gaddr = kvm_s390_real_to_abs(vcpu, gaddr);
 	scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
-		rc = dat_reset_reference_bit(vcpu->arch.gmap->asce, gpa_to_gfn(gaddr));
+		rc = dat_reset_reference_bit(vcpu->arch.gmap->asce, gpa_to_gfn(gaddr), &skey);
 	if (rc > 0)
 		return kvm_s390_inject_program_int(vcpu, rc);
 	if (rc < 0)
 		return rc;
-	kvm_s390_set_psw_cc(vcpu, rc);
+	kvm_s390_set_psw_cc(vcpu, (skey.skey >> 1) & 3);
 	return 0;
 }
 
@@ -1260,8 +1261,9 @@ static int handle_essa(struct kvm_vcpu *vcpu)
 		/* Retry the ESSA instruction */
 		kvm_s390_retry_instr(vcpu);
 	} else {
-		scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
-			i = __do_essa(vcpu, orc);
+		scoped_guard(mutex, &vcpu->kvm->slots_arch_lock)
+			scoped_guard(read_lock, &vcpu->kvm->mmu_lock)
+				i = __do_essa(vcpu, orc);
 		if (i < 0)
 			return i;
 		/* Account for the possible extra cbrl entry */
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 1beacc841ca85..b02e0159d3cd2 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -244,6 +244,24 @@ static void kvm_s390_clear_pv_state(struct kvm *kvm)
 	kvm->arch.pv.stor_var = NULL;
 }
 
+static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)
+{
+	if (free_stor_base)
+		free_pages(vcpu->arch.pv.stor_base, get_order(uv_info.guest_cpu_stor_len));
+	free_page((unsigned long)sida_addr(vcpu->arch.sie_block));
+	vcpu->arch.sie_block->pv_handle_cpu = 0;
+	vcpu->arch.sie_block->pv_handle_config = 0;
+	memset(&vcpu->arch.pv, 0, sizeof(vcpu->arch.pv));
+	vcpu->arch.sie_block->sdf = 0;
+	/*
+	 * The sidad field (for sdf == 2) is now the gbea field (for sdf == 0).
+	 * Use the reset value of gbea to avoid leaking the kernel pointer of
+	 * the just freed sida.
+	 */
+	vcpu->arch.sie_block->gbea = 1;
+	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+}
+
 int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)
 {
 	int cc;
@@ -258,24 +276,9 @@ int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)
 	WARN_ONCE(cc, "protvirt destroy cpu failed rc %x rrc %x", *rc, *rrc);
 
 	/* Intended memory leak for something that should never happen. */
-	if (!cc)
-		free_pages(vcpu->arch.pv.stor_base,
-			   get_order(uv_info.guest_cpu_stor_len));
-
-	free_page((unsigned long)sida_addr(vcpu->arch.sie_block));
-	vcpu->arch.sie_block->pv_handle_cpu = 0;
-	vcpu->arch.sie_block->pv_handle_config = 0;
-	memset(&vcpu->arch.pv, 0, sizeof(vcpu->arch.pv));
-	vcpu->arch.sie_block->sdf = 0;
-	/*
-	 * The sidad field (for sdf == 2) is now the gbea field (for sdf == 0).
-	 * Use the reset value of gbea to avoid leaking the kernel pointer of
-	 * the just freed sida.
-	 */
-	vcpu->arch.sie_block->gbea = 1;
-	kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
+	kvm_s390_pv_dispose_cpu(vcpu, !cc);
 
-	return cc ? EIO : 0;
+	return cc ? -EIO : 0;
 }
 
 int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)
@@ -319,9 +322,7 @@ int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)
 		     uvcb.header.rrc);
 
 	if (cc) {
-		u16 dummy;
-
-		kvm_s390_pv_destroy_cpu(vcpu, &dummy, &dummy);
+		kvm_s390_pv_dispose_cpu(vcpu, true);
 		return -EIO;
 	}
 
@@ -809,7 +810,7 @@ static int unpack_one(struct kvm *kvm, unsigned long addr, u64 tweak,
 			return -EAGAIN;
 	}
 
-	if (ret && ret != -EAGAIN)
+	if (ret && ret != -EAGAIN && ret != -EINTR)
 		KVM_UV_EVENT(kvm, 3, "PROTVIRT VM UNPACK: failed addr %llx with rc %x rrc %x",
 			     uvcb.gaddr, *rc, *rrc);
 	return ret;

gemini-3.1-pro-preview

null

null

							input: 11158
							output: 33
							thoughts: 1040
						

**Analyzing the s390 KVM Patch Series for Fuzzing Opportunities**

Okay, so I have this patch series for the s390 KVM subsystem in front of me. I see that it touches quite a few files: `kvm_host.h`, `dat.c`, `dat.h`, `faultin.c`, `intercept.c`, `interrupt.c`, `kvm-s390.c`, `priv.c`, and `pv.c`. A fairly extensive modification, so let's dig deeper to see where the interesting bits for fuzzing lie.

The patch seems to be about data addressing translation, initialization, and several control flow paths within KVM. Specifically, it introduces a `bool initialized` flag in the `kvm_vcpu_arch` structure, which immediately catches my attention as a potential source of race conditions if not handled properly across different CPU states. The modifications to `dat_reset_reference_bit` to return the secure key and handle failures are intriguing, as is the use of `__dat_ptep_xchg` in `_dat_slot_pte`, which hints at some low-level memory operations. `kvm_s390_faultin_gfn` looks like a hotspot for potential issues. The instruction retries related to `handle_mvpg_pei` sounds like a good place to look for subtle edge cases.

I see a pattern of adding initialization checks (`vcpu->arch.initialized`) in functions like `sca_clear_ext_call`, `sca_del_vcpu`, `kvm_arch_vcpu_ioctl_run`, and `kvm_arch_vcpu_ioctl`, which indicates that there are new states being managed. The use of `guard(srcu)` and `guard(mutex)` in `kvm_s390_vm_set_migration` is good to see for concurrency safety, but I'll need to verify that it's applied consistently. I need to keep in mind that the use of `smp_store_release` and `smp_load_acquire` implies careful consideration of memory ordering which could make a good target for fuzzing.

Now, this patch modifies the core KVM logic on s390, so it's clearly reachable via KVM ioctls. The question is: is s390 KVM fuzzable, and is it a good target? Yes, according to my knowledge, syzkaller supports s390x and KVM. Also, I've got a good setup. I can test s390x KVM within QEMU with either TCG or KVM on an s390x host. And syzkaller runs s390x VMs. I'm good to go there.

So, let's identify the most promising functions for fuzzing. Looking at the changes, I'd say the following functions are primary targets: `kvm_s390_keyop`, `kvm_s390_vm_set_migration`, `kvm_arch_vcpu_create`, `kvm_arch_vcpu_ioctl_run`, `kvm_arch_vcpu_ioctl`, `kvm_arch_commit_memory_region`, `handle_rrbe`, `handle_essa`, `kvm_s390_pv_destroy_cpu`, and `kvm_s390_pv_create_cpu`.

Finally, just to be sure, I should check the Kconfig to verify that the base KVM is enabled: `CONFIG_KVM`. All good. I think I have a solid list of targets to investigate further and start crafting some fuzzing campaigns.

{
  "Expression": "^(int|void|long|static).* kvm_s390_keyop"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=550=static void __kvm_s390_exit(void)\n--\narch/s390/kvm/kvm-s390.c-561-\narch/s390/kvm/kvm-s390.c:562:static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op,\narch/s390/kvm/kvm-s390.c-563-\t\t\t  unsigned long addr, union skey skey)\n"
}

gemini-3.1-pro-preview

null

null

							input: 13212
							output: 24
							thoughts: 22
						

Here's a summary of my thought process:

**Diving into the `kvm_s390_keyop` Caller**

Okay, so `kvm_s390_keyop` is a static function. That means it's scoped within its current source file, making it a bit more challenging to understand its broader context at a glance. I need to figure out *where* it's being called. Understanding the callsite is critical to understanding the purpose and usage of this function within the KVM/s390 architecture. This is standard procedure when I encounter a static function; the call graph is the first thing I trace. Let's find its caller(s).

{
  "Expression": "kvm_s390_keyop"
}

{
  "Output": "Documentation/virt/kvm/api.rst=6530=the capability to be present.\n--\nDocumentation/virt/kvm/api.rst-6539-:Type: vm ioctl\nDocumentation/virt/kvm/api.rst:6540::Parameters: struct kvm_s390_keyop (in/out)\nDocumentation/virt/kvm/api.rst-6541-:Returns: 0 in case of success, \u003c 0 on error\n--\nDocumentation/virt/kvm/api.rst=6544=previous storage key (or the relevant part thereof) will be returned in\n--\nDocumentation/virt/kvm/api.rst-6548-\nDocumentation/virt/kvm/api.rst:6549:  struct kvm_s390_keyop {\nDocumentation/virt/kvm/api.rst-6550-\t__u64 guest_addr;\n--\narch/s390/kvm/kvm-s390.c=550=static void __kvm_s390_exit(void)\n--\narch/s390/kvm/kvm-s390.c-561-\narch/s390/kvm/kvm-s390.c:562:static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op,\narch/s390/kvm/kvm-s390.c-563-\t\t\t  unsigned long addr, union skey skey)\n--\narch/s390/kvm/kvm-s390.c=2926=int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n--\narch/s390/kvm/kvm-s390.c-3058-\t\tstruct kvm_s390_mmu_cache *mc;\narch/s390/kvm/kvm-s390.c:3059:\t\tstruct kvm_s390_keyop kop;\narch/s390/kvm/kvm-s390.c-3060-\t\tunion skey skey;\n--\narch/s390/kvm/kvm-s390.c-3071-\narch/s390/kvm/kvm-s390.c:3072:\t\tr = kvm_s390_keyop(mc, kvm, kop.operation, kop.guest_addr, skey);\narch/s390/kvm/kvm-s390.c-3073-\t\tkvm_s390_free_mmu_cache(mc);\n--\ninclude/uapi/linux/kvm.h=1244=struct kvm_vfio_spapr_tce {\n--\ninclude/uapi/linux/kvm.h-1251-#define KVM_S390_KEYOP_SSKE 0x03\ninclude/uapi/linux/kvm.h:1252:struct kvm_s390_keyop {\ninclude/uapi/linux/kvm.h-1253-\t__u64 guest_addr;\n--\ninclude/uapi/linux/kvm.h-1277-#define KVM_S390_VCPU_FAULT\t _IOW(KVMIO, 0x52, unsigned long)\ninclude/uapi/linux/kvm.h:1278:#define KVM_S390_KEYOP           _IOWR(KVMIO, 0x53, struct kvm_s390_keyop)\ninclude/uapi/linux/kvm.h-1279-\n--\ntools/include/uapi/linux/kvm.h=1244=struct kvm_vfio_spapr_tce {\n--\ntools/include/uapi/linux/kvm.h-1251-#define KVM_S390_KEYOP_SSKE 0x03\ntools/include/uapi/linux/kvm.h:1252:struct kvm_s390_keyop {\ntools/include/uapi/linux/kvm.h-1253-\t__u64 guest_addr;\n--\ntools/include/uapi/linux/kvm.h-1277-#define KVM_S390_VCPU_FAULT\t _IOW(KVMIO, 0x52, unsigned long)\ntools/include/uapi/linux/kvm.h:1278:#define KVM_S390_KEYOP           _IOWR(KVMIO, 0x53, struct kvm_s390_keyop)\ntools/include/uapi/linux/kvm.h-1279-\n--\ntools/testing/selftests/kvm/s390/keyop.c=71=static int do_keyop(struct kvm_vcpu *vcpu, int op, unsigned long page_idx, unsigned char skey)\ntools/testing/selftests/kvm/s390/keyop.c-72-{\ntools/testing/selftests/kvm/s390/keyop.c:73:\tstruct kvm_s390_keyop keyop = {\ntools/testing/selftests/kvm/s390/keyop.c-74-\t\t.guest_addr = BUF_START_ADDR + page_idx * PAGE_SIZE,\n"
}

gemini-3.1-pro-preview

null

null

							input: 14805
							output: 36
							thoughts: 47
						

Here's my take on the thought process, summarized as you requested:

**Navigating the KVM S390 Key Operations**

Okay, so I'm diving into this KVM stuff and focusing on the S390 architecture. Right, so `kvm_arch_vm_ioctl` is the primary entry point for the `KVM_S390_KEYOP` command. That’s where I need to start. The main function.

My next step, I need to analyze `kvm_s390_vm_set_migration`. That function is probably involved in setting up or managing migration related activities, since its name includes "migration". I’ll have to dig deeper there to see the mechanics of how that key operation is handled.

{
  "Expression": "^(int|void|long|static).* kvm_s390_vm_set_migration"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=1271=static int kvm_s390_vm_stop_migration(struct kvm *kvm)\n--\narch/s390/kvm/kvm-s390.c-1297-\narch/s390/kvm/kvm-s390.c:1298:static int kvm_s390_vm_set_migration(struct kvm *kvm,\narch/s390/kvm/kvm-s390.c-1299-\t\t\t\t     struct kvm_device_attr *attr)\n"
}

gemini-3.1-pro-preview

null

null

							input: 15229
							output: 27
							thoughts: 12
						

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Navigating a Static Landscape**

Alright, this code… it feels incredibly static. I'm hitting a wall here. There's something inherently *unchanging* about its current state that's preventing me from understanding its broader role. My initial instinct is to cut through the noise and figure out *what* is responsible for activating this thing. The key to unlocking its function lies in identifying the entry point, the origin of its execution. Let's find its caller. That's the priority right now; tracing back the flow to its source should illuminate its purpose.

{
  "Expression": "kvm_s390_vm_set_migration"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=1271=static int kvm_s390_vm_stop_migration(struct kvm *kvm)\n--\narch/s390/kvm/kvm-s390.c-1297-\narch/s390/kvm/kvm-s390.c:1298:static int kvm_s390_vm_set_migration(struct kvm *kvm,\narch/s390/kvm/kvm-s390.c-1299-\t\t\t\t     struct kvm_device_attr *attr)\n--\narch/s390/kvm/kvm-s390.c=2044=static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)\n--\narch/s390/kvm/kvm-s390.c-2061-\tcase KVM_S390_VM_MIGRATION:\narch/s390/kvm/kvm-s390.c:2062:\t\tret = kvm_s390_vm_set_migration(kvm, attr);\narch/s390/kvm/kvm-s390.c-2063-\t\tbreak;\n"
}

gemini-3.1-pro-preview

null

null

							input: 15769
							output: 32
							thoughts: 51
						

Here's my summary, as though I'm thinking through this process:

**Diving into KVM/s390x Migration**

Okay, so `kvm_s390_vm_set_attr` is the starting gun for any interaction related to migration on the s390x architecture, specifically when dealing with the `KVM_S390_VM_MIGRATION` command. That's our entry point. Now, to understand how this is handled, the next logical step is to see how the virtual CPUs are created in the context of this process. The next function to examine would be `kvm_arch_vcpu_create`. That will give me the low-down on how the virtual CPUs get set up initially, which will then illuminate how migration interacts with them.

{
  "Expression": "^(int|void|long|static).* kvm_arch_vcpu_create"
}

{
  "Output": "arch/arm64/kvm/arm.c=512=int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)\n--\narch/arm64/kvm/arm.c-522-\narch/arm64/kvm/arm.c:523:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/arm64/kvm/arm.c-524-{\n--\narch/loongarch/kvm/vcpu.c=1505=int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)\n--\narch/loongarch/kvm/vcpu.c-1509-\narch/loongarch/kvm/vcpu.c:1510:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/loongarch/kvm/vcpu.c-1511-{\n--\narch/mips/kvm/mips.c=273=int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)\n--\narch/mips/kvm/mips.c-277-\narch/mips/kvm/mips.c:278:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/mips/kvm/mips.c-279-{\n--\narch/powerpc/kvm/powerpc.c=746=static enum hrtimer_restart kvmppc_decrementer_wakeup(struct hrtimer *timer)\n--\narch/powerpc/kvm/powerpc.c-755-\narch/powerpc/kvm/powerpc.c:756:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/powerpc/kvm/powerpc.c-757-{\n--\narch/riscv/kvm/vcpu.c=127=int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)\n--\narch/riscv/kvm/vcpu.c-131-\narch/riscv/kvm/vcpu.c:132:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/riscv/kvm/vcpu.c-133-{\n--\narch/s390/kvm/kvm-s390.c=3799=DEFINE_FREE(sie_page, struct sie_page *, if (_T) free_page((unsigned long)(_T)))\narch/s390/kvm/kvm-s390.c-3800-\narch/s390/kvm/kvm-s390.c:3801:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-3802-{\n--\narch/x86/kvm/x86.c=12734=int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)\n--\narch/x86/kvm/x86.c-12772-\narch/x86/kvm/x86.c:12773:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\narch/x86/kvm/x86.c-12774-{\n--\ninclude/linux/kvm_host.h=1622=int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id);\ninclude/linux/kvm_host.h:1623:int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu);\ninclude/linux/kvm_host.h-1624-void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu);\n"
}

gemini-3.1-pro-preview

null

null

							input: 17054
							output: 34
							thoughts: 37
						

Here's my summary, as though I'm thinking through this process:

**Diving into KVM Functionality**

Okay, `kvm_arch_vcpu_create`... that's a familiar KVM API function. It's a foundational piece, used to construct a virtual CPU. Now, let's pivot to something related and see what it's all about. Let's delve into `kvm_arch_vcpu_ioctl_run`. That seems like the right next step to examine in this area.

{
  "Expression": "^(int|void|long|static).* kvm_arch_vcpu_ioctl_run"
}

{
  "Output": "arch/arm64/kvm/arm.c=1230=static int noinstr kvm_arm_vcpu_enter_exit(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/arm.c-1250- */\narch/arm64/kvm/arm.c:1251:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/arm64/kvm/arm.c-1252-{\n--\narch/loongarch/kvm/vcpu.c=1825=void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)\n--\narch/loongarch/kvm/vcpu.c-1848-\narch/loongarch/kvm/vcpu.c:1849:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/loongarch/kvm/vcpu.c-1850-{\n--\narch/mips/kvm/mips.c=411=static int noinstr kvm_mips_vcpu_enter_exit(struct kvm_vcpu *vcpu)\n--\narch/mips/kvm/mips.c-421-\narch/mips/kvm/mips.c:422:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/mips/kvm/mips.c-423-{\n--\narch/powerpc/kvm/powerpc.c=1732=int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)\n--\narch/powerpc/kvm/powerpc.c-1780-\narch/powerpc/kvm/powerpc.c:1781:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/powerpc/kvm/powerpc.c-1782-{\n--\narch/riscv/kvm/vcpu.c=778=static void noinstr kvm_riscv_vcpu_enter_exit(struct kvm_vcpu *vcpu,\n--\narch/riscv/kvm/vcpu.c-857-\narch/riscv/kvm/vcpu.c:858:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/riscv/kvm/vcpu.c-859-{\n--\narch/s390/kvm/kvm-s390.c=5001=static void store_regs(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-5021-\narch/s390/kvm/kvm-s390.c:5022:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-5023-{\n--\narch/x86/kvm/x86.c=11927=static int kvm_x86_vcpu_pre_run(struct kvm_vcpu *vcpu)\n--\narch/x86/kvm/x86.c-11955-\narch/x86/kvm/x86.c:11956:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/x86/kvm/x86.c-11957-{\n--\ninclude/linux/kvm_host.h=1616=int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\ninclude/linux/kvm_host.h-1617-\t\t\t\t\tstruct kvm_guest_debug *dbg);\ninclude/linux/kvm_host.h:1618:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu);\ninclude/linux/kvm_host.h-1619-\n"
}

gemini-3.1-pro-preview

null

null

							input: 18317
							output: 32
							thoughts: 33
						

Here's my summary, as though I'm thinking through this process:

**Diving into KVM IOCTLs**

Okay, so I'm dealing with KVM internals, and `kvm_arch_vcpu_ioctl_run` is pretty much a given. It's the standard entry point. Right, time to dig deeper. I need to understand the larger context. Let's start by taking a closer look at `kvm_arch_vcpu_ioctl` itself. That seems like the logical next step to get the broader picture.

{
  "Expression": "^(int|void|long|static).* kvm_arch_vcpu_ioctl"
}

{
  "Output": "\nFull output is too long, showing 500 out of 526 lines.\nUse more precise expression if possible.\n\narch/arm64/kvm/arm.c=781=static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/arm.c-785-\narch/arm64/kvm/arm.c:786:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/arm64/kvm/arm.c-787-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/arm64/kvm/arm.c-793-\narch/arm64/kvm/arm.c:794:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/arm64/kvm/arm.c-795-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/arm64/kvm/arm.c=1230=static int noinstr kvm_arm_vcpu_enter_exit(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/arm.c-1250- */\narch/arm64/kvm/arm.c:1251:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/arm64/kvm/arm.c-1252-{\n--\narch/arm64/kvm/arm.c=1680=static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/arm.c-1702-\narch/arm64/kvm/arm.c:1703:static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,\narch/arm64/kvm/arm.c-1704-\t\t\t\t\t struct kvm_vcpu_init *init)\n--\narch/arm64/kvm/arm.c=1806=static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/arm.c-1823-\narch/arm64/kvm/arm.c:1824:long kvm_arch_vcpu_ioctl(struct file *filp,\narch/arm64/kvm/arm.c-1825-\t\t\t unsigned int ioctl, unsigned long arg)\n--\narch/arm64/kvm/guest.c=511=static int set_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)\n--\narch/arm64/kvm/guest.c-535-\narch/arm64/kvm/guest.c:536:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/arm64/kvm/guest.c-537-{\n--\narch/arm64/kvm/guest.c-540-\narch/arm64/kvm/guest.c:541:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/arm64/kvm/guest.c-542-{\n--\narch/arm64/kvm/guest.c=719=int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)\n--\narch/arm64/kvm/guest.c-735-\narch/arm64/kvm/guest.c:736:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/arm64/kvm/guest.c-737-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/arm64/kvm/guest.c-741-\narch/arm64/kvm/guest.c:742:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/arm64/kvm/guest.c-743-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/arm64/kvm/guest.c=825=u32 __attribute_const__ kvm_target_cpu(void)\n--\narch/arm64/kvm/guest.c-854-\narch/arm64/kvm/guest.c:855:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/arm64/kvm/guest.c-856-{\n--\narch/arm64/kvm/guest.c-859-\narch/arm64/kvm/guest.c:860:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/arm64/kvm/guest.c-861-{\n--\narch/arm64/kvm/guest.c-864-\narch/arm64/kvm/guest.c:865:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/arm64/kvm/guest.c-866-\t\t\t\t  struct kvm_translation *tr)\n--\narch/arm64/kvm/guest.c-880- */\narch/arm64/kvm/guest.c:881:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/arm64/kvm/guest.c-882-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/loongarch/kvm/vcpu.c=420=vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)\n--\narch/loongarch/kvm/vcpu.c-424-\narch/loongarch/kvm/vcpu.c:425:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/loongarch/kvm/vcpu.c-426-\t\t\t\t  struct kvm_translation *tr)\n--\narch/loongarch/kvm/vcpu.c=444=int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)\n--\narch/loongarch/kvm/vcpu.c-466-\narch/loongarch/kvm/vcpu.c:467:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/loongarch/kvm/vcpu.c-468-\t\t\t\tstruct kvm_mp_state *mp_state)\n--\narch/loongarch/kvm/vcpu.c-474-\narch/loongarch/kvm/vcpu.c:475:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/loongarch/kvm/vcpu.c-476-\t\t\t\tstruct kvm_mp_state *mp_state)\n--\narch/loongarch/kvm/vcpu.c-490-\narch/loongarch/kvm/vcpu.c:491:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/loongarch/kvm/vcpu.c-492-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/loongarch/kvm/vcpu.c=984=static int kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)\n--\narch/loongarch/kvm/vcpu.c-1001-\narch/loongarch/kvm/vcpu.c:1002:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)\narch/loongarch/kvm/vcpu.c-1003-{\n--\narch/loongarch/kvm/vcpu.c-1006-\narch/loongarch/kvm/vcpu.c:1007:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)\narch/loongarch/kvm/vcpu.c-1008-{\n--\narch/loongarch/kvm/vcpu.c-1011-\narch/loongarch/kvm/vcpu.c:1012:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/loongarch/kvm/vcpu.c-1013-{\n--\narch/loongarch/kvm/vcpu.c-1023-\narch/loongarch/kvm/vcpu.c:1024:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/loongarch/kvm/vcpu.c-1025-{\n--\narch/loongarch/kvm/vcpu.c=1215=static int kvm_loongarch_vcpu_set_attr(struct kvm_vcpu *vcpu,\n--\narch/loongarch/kvm/vcpu.c-1233-\narch/loongarch/kvm/vcpu.c:1234:long kvm_arch_vcpu_ioctl(struct file *filp,\narch/loongarch/kvm/vcpu.c-1235-\t\t\t unsigned int ioctl, unsigned long arg)\n--\narch/loongarch/kvm/vcpu.c-1306-\narch/loongarch/kvm/vcpu.c:1307:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/loongarch/kvm/vcpu.c-1308-{\n--\narch/loongarch/kvm/vcpu.c-1318-\narch/loongarch/kvm/vcpu.c:1319:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/loongarch/kvm/vcpu.c-1320-{\n--\narch/loongarch/kvm/vcpu.c=1825=void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)\n--\narch/loongarch/kvm/vcpu.c-1848-\narch/loongarch/kvm/vcpu.c:1849:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/loongarch/kvm/vcpu.c-1850-{\n--\narch/mips/kvm/mips.c=386=void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)\n--\narch/mips/kvm/mips.c-397-\narch/mips/kvm/mips.c:398:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/mips/kvm/mips.c-399-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/mips/kvm/mips.c=411=static int noinstr kvm_mips_vcpu_enter_exit(struct kvm_vcpu *vcpu)\n--\narch/mips/kvm/mips.c-421-\narch/mips/kvm/mips.c:422:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/mips/kvm/mips.c-423-{\n--\narch/mips/kvm/mips.c=479=int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,\n--\narch/mips/kvm/mips.c-514-\narch/mips/kvm/mips.c:515:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/mips/kvm/mips.c-516-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/mips/kvm/mips.c-520-\narch/mips/kvm/mips.c:521:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/mips/kvm/mips.c-522-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/mips/kvm/mips.c=898=long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n--\narch/mips/kvm/mips.c-917-\narch/mips/kvm/mips.c:918:long kvm_arch_vcpu_ioctl(struct file *filp, unsigned int ioctl,\narch/mips/kvm/mips.c-919-\t\t\t unsigned long arg)\n--\narch/mips/kvm/mips.c=987=int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n--\narch/mips/kvm/mips.c-998-\narch/mips/kvm/mips.c:999:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/mips/kvm/mips.c-1000-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/mips/kvm/mips.c-1004-\narch/mips/kvm/mips.c:1005:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/mips/kvm/mips.c-1006-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/mips/kvm/mips.c=1011=void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)\n--\narch/mips/kvm/mips.c-1014-\narch/mips/kvm/mips.c:1015:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/mips/kvm/mips.c-1016-{\n--\narch/mips/kvm/mips.c-1019-\narch/mips/kvm/mips.c:1020:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/mips/kvm/mips.c-1021-{\n--\narch/mips/kvm/mips.c=1082=int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)\n--\narch/mips/kvm/mips.c-1112-\narch/mips/kvm/mips.c:1113:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/mips/kvm/mips.c-1114-{\n--\narch/mips/kvm/mips.c-1129-\narch/mips/kvm/mips.c:1130:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/mips/kvm/mips.c-1131-{\n--\narch/mips/kvm/mips.c-1146-\narch/mips/kvm/mips.c:1147:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/mips/kvm/mips.c-1148-\t\t\t\t  struct kvm_translation *tr)\n--\narch/powerpc/kvm/book3s.c=525=void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)\n--\narch/powerpc/kvm/book3s.c-528-\narch/powerpc/kvm/book3s.c:529:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s.c-530-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/book3s.c-540-\narch/powerpc/kvm/book3s.c:541:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s.c-542-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/book3s.c-552-\narch/powerpc/kvm/book3s.c:553:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/powerpc/kvm/book3s.c-554-{\n--\narch/powerpc/kvm/book3s.c-580-\narch/powerpc/kvm/book3s.c:581:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/powerpc/kvm/book3s.c-582-{\n--\narch/powerpc/kvm/book3s.c-607-\narch/powerpc/kvm/book3s.c:608:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/powerpc/kvm/book3s.c-609-{\n--\narch/powerpc/kvm/book3s.c-612-\narch/powerpc/kvm/book3s.c:613:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/powerpc/kvm/book3s.c-614-{\n--\narch/powerpc/kvm/book3s.c=807=int kvmppc_vcpu_run(struct kvm_vcpu *vcpu)\n--\narch/powerpc/kvm/book3s.c-811-\narch/powerpc/kvm/book3s.c:812:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s.c-813-                                  struct kvm_translation *tr)\n--\narch/powerpc/kvm/book3s.c-817-\narch/powerpc/kvm/book3s.c:818:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s.c-819-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/powerpc/kvm/book3s_hv.c=1968=static int kvmppc_handle_nested_exit(struct kvm_vcpu *vcpu)\n--\narch/powerpc/kvm/book3s_hv.c-2099-\narch/powerpc/kvm/book3s_hv.c:2100:static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s_hv.c-2101-\t\t\t\t\t    struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/book3s_hv.c-2114-\narch/powerpc/kvm/book3s_hv.c:2115:static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s_hv.c-2116-\t\t\t\t\t    struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/book3s_pr.c=1135=int kvmppc_handle_exit_pr(struct kvm_vcpu *vcpu, unsigned int exit_nr)\n--\narch/powerpc/kvm/book3s_pr.c-1454-\narch/powerpc/kvm/book3s_pr.c:1455:static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s_pr.c-1456-\t\t\t\t\t    struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/book3s_pr.c-1481-\narch/powerpc/kvm/book3s_pr.c:1482:static int kvm_arch_vcpu_ioctl_set_sregs_pr(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/book3s_pr.c-1483-\t\t\t\t\t    struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/booke.c=1442=void kvmppc_subarch_vcpu_uninit(struct kvm_vcpu *vcpu)\n--\narch/powerpc/kvm/booke.c-1446-\narch/powerpc/kvm/booke.c:1447:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/powerpc/kvm/booke.c-1448-{\n--\narch/powerpc/kvm/booke.c-1477-\narch/powerpc/kvm/booke.c:1478:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/powerpc/kvm/booke.c-1479-{\n--\narch/powerpc/kvm/booke.c=1605=int kvmppc_set_sregs_ivor(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/booke.c-1629-\narch/powerpc/kvm/booke.c:1630:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/booke.c-1631-                                  struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/booke.c-1646-\narch/powerpc/kvm/booke.c:1647:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/booke.c-1648-                                  struct kvm_sregs *sregs)\n--\narch/powerpc/kvm/booke.c=1727=int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id,\n--\narch/powerpc/kvm/booke.c-1795-\narch/powerpc/kvm/booke.c:1796:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/powerpc/kvm/booke.c-1797-{\n--\narch/powerpc/kvm/booke.c-1800-\narch/powerpc/kvm/booke.c:1801:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/powerpc/kvm/booke.c-1802-{\n--\narch/powerpc/kvm/booke.c-1805-\narch/powerpc/kvm/booke.c:1806:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/booke.c-1807-                                  struct kvm_translation *tr)\n--\narch/powerpc/kvm/booke.c=1980=int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, enum xlate_instdata xlid,\n--\narch/powerpc/kvm/booke.c-2030-\narch/powerpc/kvm/booke.c:2031:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/booke.c-2032-\t\t\t\t\t struct kvm_guest_debug *dbg)\n--\narch/powerpc/kvm/powerpc.c=1732=int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)\n--\narch/powerpc/kvm/powerpc.c-1780-\narch/powerpc/kvm/powerpc.c:1781:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/powerpc/kvm/powerpc.c-1782-{\n--\narch/powerpc/kvm/powerpc.c=2000=bool kvm_arch_intc_initialized(struct kvm *kvm)\n--\narch/powerpc/kvm/powerpc.c-2012-\narch/powerpc/kvm/powerpc.c:2013:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/powerpc.c-2014-                                    struct kvm_mp_state *mp_state)\n--\narch/powerpc/kvm/powerpc.c-2018-\narch/powerpc/kvm/powerpc.c:2019:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/powerpc/kvm/powerpc.c-2020-                                    struct kvm_mp_state *mp_state)\n--\narch/powerpc/kvm/powerpc.c=2025=long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n--\narch/powerpc/kvm/powerpc.c-2039-\narch/powerpc/kvm/powerpc.c:2040:long kvm_arch_vcpu_ioctl(struct file *filp,\narch/powerpc/kvm/powerpc.c-2041-                         unsigned int ioctl, unsigned long arg)\n--\narch/riscv/kvm/vcpu.c=249=long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n--\narch/riscv/kvm/vcpu.c-269-\narch/riscv/kvm/vcpu.c:270:long kvm_arch_vcpu_ioctl(struct file *filp,\narch/riscv/kvm/vcpu.c-271-\t\t\t unsigned int ioctl, unsigned long arg)\n--\narch/riscv/kvm/vcpu.c-316-\narch/riscv/kvm/vcpu.c:317:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/riscv/kvm/vcpu.c-318-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/riscv/kvm/vcpu.c-322-\narch/riscv/kvm/vcpu.c:323:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/riscv/kvm/vcpu.c-324-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/riscv/kvm/vcpu.c-328-\narch/riscv/kvm/vcpu.c:329:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/riscv/kvm/vcpu.c-330-{\n--\narch/riscv/kvm/vcpu.c-333-\narch/riscv/kvm/vcpu.c:334:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/riscv/kvm/vcpu.c-335-{\n--\narch/riscv/kvm/vcpu.c-338-\narch/riscv/kvm/vcpu.c:339:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/riscv/kvm/vcpu.c-340-\t\t\t\t  struct kvm_translation *tr)\n--\narch/riscv/kvm/vcpu.c-344-\narch/riscv/kvm/vcpu.c:345:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/riscv/kvm/vcpu.c-346-{\n--\narch/riscv/kvm/vcpu.c-349-\narch/riscv/kvm/vcpu.c:350:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/riscv/kvm/vcpu.c-351-{\n--\narch/riscv/kvm/vcpu.c=519=bool kvm_riscv_vcpu_stopped(struct kvm_vcpu *vcpu)\n--\narch/riscv/kvm/vcpu.c-523-\narch/riscv/kvm/vcpu.c:524:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/riscv/kvm/vcpu.c-525-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/riscv/kvm/vcpu.c-531-\narch/riscv/kvm/vcpu.c:532:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/riscv/kvm/vcpu.c-533-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/riscv/kvm/vcpu.c-560-\narch/riscv/kvm/vcpu.c:561:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/riscv/kvm/vcpu.c-562-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/riscv/kvm/vcpu.c=778=static void noinstr kvm_riscv_vcpu_enter_exit(struct kvm_vcpu *vcpu,\n--\narch/riscv/kvm/vcpu.c-857-\narch/riscv/kvm/vcpu.c:858:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/riscv/kvm/vcpu.c-859-{\n--\narch/s390/kvm/kvm-s390.c=3949=int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-3955-\narch/s390/kvm/kvm-s390.c:3956:static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-3957-\t\t\t\t\t   struct kvm_one_reg *reg)\n--\narch/s390/kvm/kvm-s390.c-4004-\narch/s390/kvm/kvm-s390.c:4005:static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4006-\t\t\t\t\t   struct kvm_one_reg *reg)\n--\narch/s390/kvm/kvm-s390.c-4057-\narch/s390/kvm/kvm-s390.c:4058:static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-4059-{\n--\narch/s390/kvm/kvm-s390.c-4069-\narch/s390/kvm/kvm-s390.c:4070:static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-4071-{\n--\narch/s390/kvm/kvm-s390.c-4113-\narch/s390/kvm/kvm-s390.c:4114:static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-4115-{\n--\narch/s390/kvm/kvm-s390.c-4129-\narch/s390/kvm/kvm-s390.c:4130:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/s390/kvm/kvm-s390.c-4131-{\n--\narch/s390/kvm/kvm-s390.c-4137-\narch/s390/kvm/kvm-s390.c:4138:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/s390/kvm/kvm-s390.c-4139-{\n--\narch/s390/kvm/kvm-s390.c-4145-\narch/s390/kvm/kvm-s390.c:4146:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4147-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/s390/kvm/kvm-s390.c-4157-\narch/s390/kvm/kvm-s390.c:4158:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4159-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/s390/kvm/kvm-s390.c-4169-\narch/s390/kvm/kvm-s390.c:4170:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/s390/kvm/kvm-s390.c-4171-{\n--\narch/s390/kvm/kvm-s390.c-4184-\narch/s390/kvm/kvm-s390.c:4185:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/s390/kvm/kvm-s390.c-4186-{\n--\narch/s390/kvm/kvm-s390.c-4199-\narch/s390/kvm/kvm-s390.c:4200:static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)\narch/s390/kvm/kvm-s390.c-4201-{\n--\narch/s390/kvm/kvm-s390.c-4212-\narch/s390/kvm/kvm-s390.c:4213:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4214-\t\t\t\t  struct kvm_translation *tr)\n--\narch/s390/kvm/kvm-s390.c-4222-\narch/s390/kvm/kvm-s390.c:4223:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4224-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/s390/kvm/kvm-s390.c-4264-\narch/s390/kvm/kvm-s390.c:4265:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4266-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/s390/kvm/kvm-s390.c-4279-\narch/s390/kvm/kvm-s390.c:4280:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-4281-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/s390/kvm/kvm-s390.c=5001=static void store_regs(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-5021-\narch/s390/kvm/kvm-s390.c:5022:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-5023-{\n--\narch/s390/kvm/kvm-s390.c=5481=static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,\n--\narch/s390/kvm/kvm-s390.c-5522-\narch/s390/kvm/kvm-s390.c:5523:long kvm_arch_vcpu_ioctl(struct file *filp,\narch/s390/kvm/kvm-s390.c-5524-\t\t\t unsigned int ioctl, unsigned long arg)\n--\narch/x86/kvm/x86.c=6167=static int kvm_get_reg_list(struct kvm_vcpu *vcpu,\n--\narch/x86/kvm/x86.c-6188-\narch/x86/kvm/x86.c:6189:long kvm_arch_vcpu_ioctl(struct file *filp,\narch/x86/kvm/x86.c-6190-\t\t\t unsigned int ioctl, unsigned long arg)\n--\narch/x86/kvm/x86.c=11927=static int kvm_x86_vcpu_pre_run(struct kvm_vcpu *vcpu)\n--\narch/x86/kvm/x86.c-11955-\narch/x86/kvm/x86.c:11956:int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)\narch/x86/kvm/x86.c-11957-{\n--\narch/x86/kvm/x86.c=12076=static void __get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\n--\narch/x86/kvm/x86.c-12111-\narch/x86/kvm/x86.c:12112:int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/x86/kvm/x86.c-12113-{\n--\narch/x86/kvm/x86.c=12124=static void __set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\n--\narch/x86/kvm/x86.c-12156-\narch/x86/kvm/x86.c:12157:int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)\narch/x86/kvm/x86.c-12158-{\n--\narch/x86/kvm/x86.c=12218=static void __get_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2)\n--\narch/x86/kvm/x86.c-12235-\narch/x86/kvm/x86.c:12236:int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,\narch/x86/kvm/x86.c-12237-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/x86/kvm/x86.c-12248-\narch/x86/kvm/x86.c:12249:int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,\narch/x86/kvm/x86.c-12250-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/x86/kvm/x86.c-12274-\narch/x86/kvm/x86.c:12275:int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,\narch/x86/kvm/x86.c-12276-\t\t\t\t    struct kvm_mp_state *mp_state)\n--\narch/x86/kvm/x86.c=12486=static int __set_sregs2(struct kvm_vcpu *vcpu, struct kvm_sregs2 *sregs2)\n--\narch/x86/kvm/x86.c-12519-\narch/x86/kvm/x86.c:12520:int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,\narch/x86/kvm/x86.c-12521-\t\t\t\t  struct kvm_sregs *sregs)\n--\narch/x86/kvm/x86.c=12535=static void kvm_arch_vcpu_guestdbg_update_apicv_inhibit(struct kvm *kvm)\n--\narch/x86/kvm/x86.c-12555-\narch/x86/kvm/x86.c:12556:int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,\narch/x86/kvm/x86.c-12557-\t\t\t\t\tstruct kvm_guest_debug *dbg)\n--\narch/x86/kvm/x86.c-12619- */\narch/x86/kvm/x86.c:12620:int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,\narch/x86/kvm/x86.c-12621-\t\t\t\t    struct kvm_translation *tr)\n--\narch/x86/kvm/x86.c-12640-\narch/x86/kvm/x86.c:12641:int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/x86/kvm/x86.c-12642-{\n--\narch/x86/kvm/x86.c-12663-\narch/x86/kvm/x86.c:12664:int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)\narch/x86/kvm/x86.c-12665-{\n--\ninclude/linux/kvm_host.h=1570=long kvm_arch_dev_ioctl(struct file *filp,\ninclude/linux/kvm_host.h-1571-\t\t\tunsigned int ioctl, unsigned long arg);\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 30757
							output: 33
							thoughts: 31
						

Here's my take on the thought process, as if it were my own:

**Analyzing KVM Memory Region Operations**

Alright, `kvm_arch_vcpu_ioctl` is a pretty standard entry point. Nothing jumps out as immediately concerning there. My focus needs to be deeper. Let's see... the real potential for issues, especially with memory management, likely lies in the commitment of memory regions. Therefore, I need to check `kvm_arch_commit_memory_region`. That's where I should be concentrating my efforts. That function is key.

{
  "Expression": "^(int|void|long|static).* kvm_arch_commit_memory_region"
}

{
  "Output": "arch/arm64/kvm/mmu.c=2510=int __init kvm_mmu_init(u32 hyp_va_bits)\n--\narch/arm64/kvm/mmu.c-2571-\narch/arm64/kvm/mmu.c:2572:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/arm64/kvm/mmu.c-2573-\t\t\t\t   struct kvm_memory_slot *old,\n--\narch/loongarch/kvm/mmu.c=379=int kvm_arch_prepare_memory_region(struct kvm *kvm, const struct kvm_memory_slot *old,\n--\narch/loongarch/kvm/mmu.c-441-\narch/loongarch/kvm/mmu.c:442:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/loongarch/kvm/mmu.c-443-\t\t\t\t   struct kvm_memory_slot *old,\n--\narch/mips/kvm/mips.c=204=int kvm_arch_prepare_memory_region(struct kvm *kvm,\n--\narch/mips/kvm/mips.c-211-\narch/mips/kvm/mips.c:212:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/mips/kvm/mips.c-213-\t\t\t\t   struct kvm_memory_slot *old,\n--\narch/powerpc/kvm/powerpc.c=719=int kvm_arch_prepare_memory_region(struct kvm *kvm,\n--\narch/powerpc/kvm/powerpc.c-726-\narch/powerpc/kvm/powerpc.c:727:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/powerpc/kvm/powerpc.c-728-\t\t\t\t   struct kvm_memory_slot *old,\n--\narch/riscv/kvm/mmu.c=137=void kvm_arch_flush_shadow_memslot(struct kvm *kvm,\n--\narch/riscv/kvm/mmu.c-154-\narch/riscv/kvm/mmu.c:155:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/riscv/kvm/mmu.c-156-\t\t\t\tstruct kvm_memory_slot *old,\n--\narch/s390/kvm/kvm-s390.c=5807=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-5813-\narch/s390/kvm/kvm-s390.c:5814:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/s390/kvm/kvm-s390.c-5815-\t\t\t\tstruct kvm_memory_slot *old,\n--\narch/x86/kvm/x86.c=13648=static void kvm_mmu_slot_apply_flags(struct kvm *kvm,\n--\narch/x86/kvm/x86.c-13764-\narch/x86/kvm/x86.c:13765:void kvm_arch_commit_memory_region(struct kvm *kvm,\narch/x86/kvm/x86.c-13766-\t\t\t\tstruct kvm_memory_slot *old,\n--\ninclude/linux/kvm_host.h=1245=int kvm_arch_prepare_memory_region(struct kvm *kvm,\n--\ninclude/linux/kvm_host.h-1248-\t\t\t\tenum kvm_mr_change change);\ninclude/linux/kvm_host.h:1249:void kvm_arch_commit_memory_region(struct kvm *kvm,\ninclude/linux/kvm_host.h-1250-\t\t\t\tstruct kvm_memory_slot *old,\n"
}

gemini-3.1-pro-preview

null

null

							input: 32058
							output: 27
							thoughts: 26
						

Here's a summary of my immediate thought process, focusing on the provided technical snippets:

**Debugging Memory Region Committal in KVM**

Okay, so `kvm_arch_commit_memory_region`... that's a pretty standard function call in the KVM architecture. Nothing immediately jumps out there as a problem; it's the expected method. Now, given that context, and assuming I'm tracking down a memory-related issue, the next logical step, based on experience, is to investigate how `handle_rrbe` is interacting. I'm focusing on that next, as it likely has implications for the memory region commit, and a memory corruption could be introduced there. That's the likely spot to inspect next.

{
  "Expression": "^(int|void|long|static).* handle_rrbe"
}

{
  "Output": "arch/s390/kvm/priv.c=257=static int handle_iske(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-288-\narch/s390/kvm/priv.c:289:static int handle_rrbe(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-290-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 32390
							output: 18
							thoughts: 12
						

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Navigating a Static Landscape**

Alright, this code… it feels incredibly static. I'm hitting a wall here. There's something inherently *unchanging* about its current state that's preventing me from understanding its broader role. My initial instinct is to cut through the noise and figure out *what* is responsible for activating this thing. The key to unlocking its function lies in identifying the entry point, the origin of its execution. Let's find its caller. That's the priority right now; tracing back the flow to its source should illuminate its purpose.

{
  "Expression": "handle_rrbe"
}

{
  "Output": "arch/s390/kvm/priv.c=257=static int handle_iske(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-288-\narch/s390/kvm/priv.c:289:static int handle_rrbe(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-290-{\n--\narch/s390/kvm/priv.c=959=int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-979-\tcase 0x2a:\narch/s390/kvm/priv.c:980:\t\treturn handle_rrbe(vcpu);\narch/s390/kvm/priv.c-981-\tcase 0x2b:\n"
}

gemini-3.1-pro-preview

null

null

							input: 32816
							output: 26
							thoughts: 29
						

Here's my summary, as though I'm thinking through this process:

**Diving into the B2 Handler**

Okay, so I'm starting at `kvm_s390_handle_b2`. That's the entry point, the first place I need to look. Now, what's next? Let's get right to it. I'm going to jump straight to examining `handle_essa`. That should be the key to understanding how this all works. Let's see what we can find.

{
  "Expression": "^(int|void|long|static).* handle_essa"
}

{
  "Output": "arch/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-1216-\narch/s390/kvm/priv.c:1217:static int handle_essa(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-1218-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 33127
							output: 17
							thoughts: 12
						

Okay, here's my interpretation of those thoughts, tailored for an expert audience, presented in the first person:

**Navigating a Static Landscape**

Alright, this code… it feels incredibly static. I'm hitting a wall here. There's something inherently *unchanging* about its current state that's preventing me from understanding its broader role. My initial instinct is to cut through the noise and figure out *what* is responsible for activating this thing. The key to unlocking its function lies in identifying the entry point, the origin of its execution. Let's find its caller. That's the priority right now; tracing back the flow to its source should illuminate its purpose.

{
  "Expression": "handle_essa"
}

{
  "Output": "arch/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-1216-\narch/s390/kvm/priv.c:1217:static int handle_essa(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-1218-{\n--\narch/s390/kvm/priv.c=1284=int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1293-\tcase 0xab:\narch/s390/kvm/priv.c:1294:\t\treturn handle_essa(vcpu);\narch/s390/kvm/priv.c-1295-\tcase 0xaf:\n"
}

gemini-3.1-pro-preview

null

null

							input: 33571
							output: 36
							thoughts: 39
						

Here's a breakdown of my thought process:

**Diving into the S390 KVM Code**

Okay, so I'm starting at `kvm_s390_handle_b9`. That's where it all begins. My immediate next step is to see how the code handles CPU destruction. It makes sense to check `kvm_s390_pv_destroy_cpu` next. It's a key function for understanding how the virtual machine's CPU resources are cleaned up. I want to trace that path.

{
  "Expression": "^(int|void|long|static).* kvm_s390_pv_destroy_cpu"
}

{
  "Output": "arch/s390/kvm/kvm-s390.h=295=static inline hva_t gpa_to_hva(struct kvm *kvm, gpa_t gpa)\n--\narch/s390/kvm/kvm-s390.h-304-/* implemented in pv.c */\narch/s390/kvm/kvm-s390.h:305:int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h-306-int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\n--\narch/s390/kvm/pv.c=247=static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)\n--\narch/s390/kvm/pv.c-264-\narch/s390/kvm/pv.c:265:int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\narch/s390/kvm/pv.c-266-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 34140
							output: 27
							thoughts: 7
						

Okay, here's the summary, expressed in the first person, assuming an expert user:

**Identifying the Source**

Alright, the objective is clear: I need to determine the origin of this. That means pinpointing its caller, the entity or process that initiated this particular sequence or action. This isn't just about identifying a process ID; I need the contextual information surrounding the call, the methods used, and the likely motives behind it. The depth of analysis will depend on the sensitivity of the situation, of course, but the core task remains the same: *find the source*. What are the potential clues? Logs? Metadata? Network traffic? I'll need to sift through all available data to trace this back to its point of origin. Understanding the "who" is the first critical step to understanding the "why" and, ultimately, the "how".

{
  "Expression": "kvm_s390_pv_destroy_cpu"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2406=int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/kvm-s390.c-2416-\t * this fails, as the ultravisor has still access to that memory.\narch/s390/kvm/kvm-s390.c:2417:\t * So kvm_s390_pv_destroy_cpu can leave a \"wanted\" memory leak\narch/s390/kvm/kvm-s390.c-2418-\t * behind.\n--\narch/s390/kvm/kvm-s390.c-2422-\t\tmutex_lock(\u0026vcpu-\u003emutex);\narch/s390/kvm/kvm-s390.c:2423:\t\tif (kvm_s390_pv_destroy_cpu(vcpu, \u0026_rc, \u0026_rrc) \u0026\u0026 !ret) {\narch/s390/kvm/kvm-s390.c-2424-\t\t\t*rc = _rc;\n--\narch/s390/kvm/kvm-s390.c=3401=void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-3422-\tif (kvm_s390_pv_cpu_get_handle(vcpu))\narch/s390/kvm/kvm-s390.c:3423:\t\tkvm_s390_pv_destroy_cpu(vcpu, \u0026rc, \u0026rrc);\narch/s390/kvm/kvm-s390.c-3424-\tfree_page((unsigned long)(vcpu-\u003earch.sie_block));\n--\narch/s390/kvm/kvm-s390.h=295=static inline hva_t gpa_to_hva(struct kvm *kvm, gpa_t gpa)\n--\narch/s390/kvm/kvm-s390.h-304-/* implemented in pv.c */\narch/s390/kvm/kvm-s390.h:305:int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h-306-int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\n--\narch/s390/kvm/pv.c=247=static void kvm_s390_pv_dispose_cpu(struct kvm_vcpu *vcpu, bool free_stor_base)\n--\narch/s390/kvm/pv.c-264-\narch/s390/kvm/pv.c:265:int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\narch/s390/kvm/pv.c-266-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 35238
							output: 36
							thoughts: 66
						

Here's my analysis of the provided code snippet, thinking like an expert:

**Investigating CPU Destruction in the KVM s390 PV Context**

Okay, so `kvm_s390_pv_destroy_cpu` is the function we're concerned with here. The code tells me it's called from two distinct points: `kvm_arch_vcpu_destroy` and `kvm_s390_cpus_from_pv`. This suggests it's involved in tearing down or cleaning up after a paravirtualized s390 virtual CPU (vCPU). Knowing these call sites gives me a starting point. `kvm_arch_vcpu_destroy` likely handles the general vCPU destruction process, and `kvm_s390_cpus_from_pv` is probably dealing with creating the initial cpus from the paravirtualized guests.

To understand the lifecycle completely, I need to see the other half of the equation. Where's the counterpart to destroy? I'll need to check the related function, `kvm_s390_pv_create_cpu`, immediately. That's the logical next step. Examining its logic will help me understand how resources are initialized and allocated, and therefore, what `kvm_s390_pv_destroy_cpu` is responsible for cleaning up. It’s always good to understand the matching create/destroy pattern.

{
  "Expression": "^(int|void|long|static).* kvm_s390_pv_create_cpu"
}

{
  "Output": "arch/s390/kvm/kvm-s390.h=305=int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h:306:int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h-307-int kvm_s390_pv_set_aside(struct kvm *kvm, u16 *rc, u16 *rrc);\n--\narch/s390/kvm/pv.c=265=int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-283-\narch/s390/kvm/pv.c:284:int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\narch/s390/kvm/pv.c-285-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 36004
							output: 27
							thoughts: 7
						

Okay, here's my interpretation of that thought process, tailored for an expert audience, and presented as if it's my own internal dialogue:

**Tracing the Source**

Right, let's get down to brass tacks. "Let's find its caller." That's the immediate need, the primary objective. No fluff, no hesitation. We've got something – a signal, a pattern, a data point – and now we need to identify the origin. This isn't about speculation or theoretical frameworks at this juncture; it’s about establishing the root cause. My expertise lies in efficiently and methodically dissecting these kinds of situations. This usually involves understanding the systems involved, knowing the typical protocols and expected behavior. It could mean digging into logs, cross-referencing datasets, analyzing communication patterns, or employing some specialized tools to map dependencies and trace activity. In essence, my focus shifts to the who or what initiated this event and how to get that information.

{
  "Expression": "kvm_s390_pv_create_cpu"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2447=static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/kvm-s390.c-2460-\t\tmutex_lock(\u0026vcpu-\u003emutex);\narch/s390/kvm/kvm-s390.c:2461:\t\tr = kvm_s390_pv_create_cpu(vcpu, rc, rrc);\narch/s390/kvm/kvm-s390.c-2462-\t\tmutex_unlock(\u0026vcpu-\u003emutex);\n--\narch/s390/kvm/kvm-s390.c=3705=static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-3782-\tif (kvm_s390_pv_is_protected(vcpu-\u003ekvm)) {\narch/s390/kvm/kvm-s390.c:3783:\t\trc = kvm_s390_pv_create_cpu(vcpu, \u0026uvrc, \u0026uvrrc);\narch/s390/kvm/kvm-s390.c-3784-\t\tif (rc)\n--\narch/s390/kvm/kvm-s390.h=305=int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h:306:int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h-307-int kvm_s390_pv_set_aside(struct kvm *kvm, u16 *rc, u16 *rrc);\n--\narch/s390/kvm/pv.c=265=int kvm_s390_pv_destroy_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/pv.c-283-\narch/s390/kvm/pv.c:284:int kvm_s390_pv_create_cpu(struct kvm_vcpu *vcpu, u16 *rc, u16 *rrc)\narch/s390/kvm/pv.c-285-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 36976
							output: 35
							thoughts: 83
						

Here's my take on the thought process, as if it were my own:

**Investigating KVM/s390 CPU Initialization**

Okay, so I'm looking at how the s390 architecture handles virtual CPU creation within KVM. Specifically, `kvm_s390_pv_create_cpu` is the function of interest here, and I need to understand its call paths. I see that it's called from two key areas: `kvm_s390_cpus_to_pv` and `kvm_s390_vcpu_setup`. This suggests that `kvm_s390_pv_create_cpu` is likely the core routine that actually sets up the paravirtualized CPU state.

Now, to get a better sense of the *why* and *how* behind this CPU creation, I should investigate a little further to understand how things are handled, and how the virtual machine receives information. I need to dig into the interrupt handling because that can give useful insights. Let's see how `kvm_s390_handle_b2` and `kvm_s390_handle_b9` tie into the whole picture. They are likely responsible for handling interrupts and related events, and their interaction with CPU creation should shed light on the overall initialization flow. This will hopefully show how the CPU is set up to receive the interrupts, handle page faults etc. in the paravirtualized environment.

{
  "Expression": "^(int|void|long|static).* kvm_s390_handle_b2"
}

{
  "Output": "arch/s390/kvm/kvm-s390.h=432=int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:433:int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h-434-int kvm_s390_handle_e3(struct kvm_vcpu *vcpu);\n--\narch/s390/kvm/priv.c=867=static int handle_stsi(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-958-\narch/s390/kvm/priv.c:959:int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-960-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 37692
							output: 26
							thoughts: 7
						

Okay, here's the summary, expressed in the first person, assuming an expert user:

**Identifying the Source**

Alright, the objective is clear: I need to determine the origin of this. That means pinpointing its caller, the entity or process that initiated this particular sequence or action. This isn't just about identifying a process ID; I need the contextual information surrounding the call, the methods used, and the likely motives behind it. The depth of analysis will depend on the sensitivity of the situation, of course, but the core task remains the same: *find the source*. What are the potential clues? Logs? Metadata? Network traffic? I'll need to sift through all available data to trace this back to its point of origin. Understanding the "who" is the first critical step to understanding the "why" and, ultimately, the "how".

{
  "Expression": "kvm_s390_handle_b2"
}

{
  "Output": "arch/s390/kvm/intercept.c=107=static int handle_instruction(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-125-\tcase 0xb2:\narch/s390/kvm/intercept.c:126:\t\treturn kvm_s390_handle_b2(vcpu);\narch/s390/kvm/intercept.c-127-\tcase 0xb6:\n--\narch/s390/kvm/kvm-s390.h=432=int kvm_s390_handle_aa(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:433:int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h-434-int kvm_s390_handle_e3(struct kvm_vcpu *vcpu);\n--\narch/s390/kvm/priv.c=867=static int handle_stsi(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-958-\narch/s390/kvm/priv.c:959:int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-960-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 38311
							output: 35
							thoughts: 32
						

Here's my take on the thought process, as if it were my own:

**Instruction Intercept Investigation**

Okay, so I'm looking at how we're handling instruction intercepts. Specifically, I need to understand the entry point for this whole process, and it looks like `handle_instruction` is the key. That's the function I need to focus on. My instinct is telling me to go and check `kvm_s390_handle_b9` because that's where I have seen a lot of activity. Let's see what's happening in there.

{
  "Expression": "^(int|void|long|static).* kvm_s390_handle_b9"
}

{
  "Output": "arch/s390/kvm/kvm-s390.h=436=int kvm_s390_handle_01(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:437:int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h-438-int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);\n--\narch/s390/kvm/priv.c=1217=static int handle_essa(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1283-\narch/s390/kvm/priv.c:1284:int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-1285-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 38789
							output: 26
							thoughts: 7
						

Okay, here's the summary, expressed in the first person, assuming an expert user:

**Identifying the Source**

Alright, the objective is clear: I need to determine the origin of this. That means pinpointing its caller, the entity or process that initiated this particular sequence or action. This isn't just about identifying a process ID; I need the contextual information surrounding the call, the methods used, and the likely motives behind it. The depth of analysis will depend on the sensitivity of the situation, of course, but the core task remains the same: *find the source*. What are the potential clues? Logs? Metadata? Network traffic? I'll need to sift through all available data to trace this back to its point of origin. Understanding the "who" is the first critical step to understanding the "why" and, ultimately, the "how".

{
  "Expression": "kvm_s390_handle_b9"
}

{
  "Output": "arch/s390/kvm/intercept.c=107=static int handle_instruction(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-131-\tcase 0xb9:\narch/s390/kvm/intercept.c:132:\t\treturn kvm_s390_handle_b9(vcpu);\narch/s390/kvm/intercept.c-133-\tcase 0xe3:\n--\narch/s390/kvm/kvm-s390.h=436=int kvm_s390_handle_01(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:437:int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h-438-int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);\n--\narch/s390/kvm/priv.c=1217=static int handle_essa(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-1283-\narch/s390/kvm/priv.c:1284:int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-1285-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 39413
							output: 17
							thoughts: 177
						

**Analyzing KVM Entry Points for Optimization**

Okay, so I'm thinking about where to start optimizing this KVM code. `handle_instruction` is definitely a key function, a hot path. That's usually the first place you look. But, instead of going straight for that function, I should zoom in on `kvm_s390_handle_b2` and `kvm_s390_handle_b9`. Those seem like more manageable entry points. I should also consider `kvm_arch_vm_ioctl` and `kvm_arch_vcpu_ioctl` as initial points of interest since they are top-level.

Looking deeper, `kvm_arch_vcpu_ioctl_run` is clearly a hot path, so that's something to investigate further. `kvm_arch_vcpu_create` looks like a good place to begin. Then there is `kvm_arch_commit_memory_region`, that seems good as well.

I should also make sure that I'm not missing any critical configurations. I know `CONFIG_KVM` is fundamental, but I need to make sure I don't overlook anything that could be relevant to performance tuning. I also should check on PV (Protected Virtualization) to see if there is any specific config that might be relevant here.

{
  "Expression": "config KVM"
}

{
  "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"
}

gemini-3.1-pro-preview

null

null

							input: 44182
							output: 39
							thoughts: 40
						

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Investigating KVM Configuration for s390**

Alright, so we're working with s390 and KVM. First things first, KVM on this architecture is going to be enabled via `CONFIG_KVM`, that's the standard. But, let's just make sure there isn't something more specific for paravirtualization within the KVM setup for this platform.

The logical place to look for those specifics would be the `arch/s390/kvm/Kconfig` file. I'll need to dig into that and see if there are any architecture-specific configuration options related to paravirtualization that need to be considered in addition to the base `CONFIG_KVM` setting. Let's see what's in there.

{
  "File": "arch/s390/kvm/Kconfig",
  "FirstLine": 1,
  "LineCount": 100
}

{
  "Contents": "   1:\t# SPDX-License-Identifier: GPL-2.0\n   2:\t#\n   3:\t# KVM configuration\n   4:\t#\n   5:\tsource \"virt/kvm/Kconfig\"\n   6:\t\n   7:\tmenuconfig VIRTUALIZATION\n   8:\t\tdef_bool y\n   9:\t\tprompt \"KVM\"\n  10:\t\thelp\n  11:\t\t  Say Y here to get to see options for using your Linux host to run other\n  12:\t\t  operating systems inside virtual machines (guests).\n  13:\t\t  This option alone does not add any kernel code.\n  14:\t\n  15:\t\t  If you say N, all options in this submenu will be skipped and disabled.\n  16:\t\n  17:\tif VIRTUALIZATION\n  18:\t\n  19:\tconfig KVM\n  20:\t\tdef_tristate y\n  21:\t\tprompt \"Kernel-based Virtual Machine (KVM) support\"\n  22:\t\tselect HAVE_KVM_CPU_RELAX_INTERCEPT\n  23:\t\tselect KVM_ASYNC_PF\n  24:\t\tselect KVM_ASYNC_PF_SYNC\n  25:\t\tselect KVM_COMMON\n  26:\t\tselect HAVE_KVM_IRQCHIP\n  27:\t\tselect HAVE_KVM_IRQ_ROUTING\n  28:\t\tselect HAVE_KVM_INVALID_WAKEUPS\n  29:\t\tselect HAVE_KVM_NO_POLL\n  30:\t\tselect KVM_VFIO\n  31:\t\tselect VIRT_XFER_TO_GUEST_WORK\n  32:\t\tselect KVM_MMU_LOCKLESS_AGING\n  33:\t\tselect KVM_GENERIC_PRE_FAULT_MEMORY\n  34:\t\thelp\n  35:\t\t  Support hosting paravirtualized guest machines using the SIE\n  36:\t\t  virtualization capability on the mainframe. This should work\n  37:\t\t  on any 64bit machine.\n  38:\t\n  39:\t\t  This module provides access to the hardware capabilities through\n  40:\t\t  a character device node named /dev/kvm.\n  41:\t\n  42:\t\t  To compile this as a module, choose M here: the module\n  43:\t\t  will be called kvm.\n  44:\t\n  45:\t\t  If unsure, say N.\n  46:\t\n  47:\tconfig KVM_S390_UCONTROL\n  48:\t\tbool \"Userspace controlled virtual machines\"\n  49:\t\tdepends on KVM\n  50:\t\thelp\n  51:\t\t  Allow CAP_SYS_ADMIN users to create KVM virtual machines that are\n  52:\t\t  controlled by userspace.\n  53:\t\n  54:\t\t  If unsure, say N.\n  55:\t\n  56:\tendif # VIRTUALIZATION\n"
}

gemini-3.1-pro-preview

null

null

							input: 45177
							output: 17
							thoughts: 74
						

**Investigating the s390 PV Configuration**

Okay, so I'm looking into the PV configuration within the s390 architecture. First thought: there isn't a dedicated one in the `arch/s390/kvm/Kconfig` file. Hmm, that's unusual. Perhaps it's handled differently here. Wait a second, could PV be indirectly enabled through `CONFIG_KVM_S390_UCONTROL`? No, no, that's for user control and isn't the same. I need to be more thorough. Let me check the broader `arch/s390/Kconfig` file to see if there's a more general s390 PV-related configuration option hiding there.

{
  "Expression": "config.*PV"
}

{
  "Output": "\nFull output is too long, showing 500 out of 639 lines.\nUse more precise expression if possible.\n\nDocumentation/networking/devlink/devlink-trap.rst=126=be added to the following table:\n--\nDocumentation/networking/devlink/devlink-trap.rst-140-     - Traps incoming packets that the device decided to drop in case of VLAN\nDocumentation/networking/devlink/devlink-trap.rst:141:       tag mismatch: The ingress bridge port is not configured with a PVID and\nDocumentation/networking/devlink/devlink-trap.rst-142-       the packet is untagged or prio-tagged\n--\nDocumentation/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/mips/cavium-octeon/executive/cvmx-helper.c=375=static int __cvmx_helper_port_setup_ipd(int ipd_port)\n--\narch/mips/cavium-octeon/executive/cvmx-helper.c-388-\narch/mips/cavium-octeon/executive/cvmx-helper.c:389:\ttag_config.s.ip6_src_flag = CVMX_HELPER_INPUT_TAG_IPV6_SRC_IP;\narch/mips/cavium-octeon/executive/cvmx-helper.c:390:\ttag_config.s.ip6_dst_flag = CVMX_HELPER_INPUT_TAG_IPV6_DST_IP;\narch/mips/cavium-octeon/executive/cvmx-helper.c:391:\ttag_config.s.ip6_sprt_flag = CVMX_HELPER_INPUT_TAG_IPV6_SRC_PORT;\narch/mips/cavium-octeon/executive/cvmx-helper.c:392:\ttag_config.s.ip6_dprt_flag = CVMX_HELPER_INPUT_TAG_IPV6_DST_PORT;\narch/mips/cavium-octeon/executive/cvmx-helper.c:393:\ttag_config.s.ip6_nxth_flag = CVMX_HELPER_INPUT_TAG_IPV6_NEXT_HEADER;\narch/mips/cavium-octeon/executive/cvmx-helper.c:394:\ttag_config.s.ip4_src_flag = CVMX_HELPER_INPUT_TAG_IPV4_SRC_IP;\narch/mips/cavium-octeon/executive/cvmx-helper.c:395:\ttag_config.s.ip4_dst_flag = CVMX_HELPER_INPUT_TAG_IPV4_DST_IP;\narch/mips/cavium-octeon/executive/cvmx-helper.c:396:\ttag_config.s.ip4_sprt_flag = CVMX_HELPER_INPUT_TAG_IPV4_SRC_PORT;\narch/mips/cavium-octeon/executive/cvmx-helper.c:397:\ttag_config.s.ip4_dprt_flag = CVMX_HELPER_INPUT_TAG_IPV4_DST_PORT;\narch/mips/cavium-octeon/executive/cvmx-helper.c:398:\ttag_config.s.ip4_pctl_flag = CVMX_HELPER_INPUT_TAG_IPV4_PROTOCOL;\narch/mips/cavium-octeon/executive/cvmx-helper.c-399-\ttag_config.s.inc_prt_flag = CVMX_HELPER_INPUT_TAG_INPUT_PORT;\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/kvm/x86.c=3290=int kvm_guest_time_update(struct kvm_vcpu *v)\n--\narch/x86/kvm/x86.c-3403-\t */\narch/x86/kvm/x86.c:3404:\tif (ka-\u003exen.hvm_config.flags \u0026 KVM_XEN_HVM_CONFIG_PVCLOCK_TSC_UNSTABLE)\narch/x86/kvm/x86.c-3405-\t\thv_clock.flags \u0026= ~PVCLOCK_TSC_STABLE_BIT;\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/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c=644=static int set_vc_config(struct adf_accel_dev *accel_dev)\n--\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-654-\t */\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c:655:\tpci_read_config_dword(pdev, ADF_GEN6_PVC0CTL_OFFSET, \u0026value);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-656-\tFIELD_MODIFY(ADF_GEN6_PVC0CTL_TCVCMAP_MASK, \u0026value, ADF_GEN6_PVC0CTL_TCVCMAP_DEFAULT);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c:657:\terr = pci_write_config_dword(pdev, ADF_GEN6_PVC0CTL_OFFSET, value);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-658-\tif (err) {\n--\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-663-\t/* Read PVC1CTL then write masked values */\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c:664:\tpci_read_config_dword(pdev, ADF_GEN6_PVC1CTL_OFFSET, \u0026value);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-665-\tFIELD_MODIFY(ADF_GEN6_PVC1CTL_TCVCMAP_MASK, \u0026value, ADF_GEN6_PVC1CTL_TCVCMAP_DEFAULT);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-666-\tFIELD_MODIFY(ADF_GEN6_PVC1CTL_VCEN_MASK, \u0026value, ADF_GEN6_PVC1CTL_VCEN_ON);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c:667:\terr = pci_write_config_dword(pdev, ADF_GEN6_PVC1CTL_OFFSET, value);\ndrivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c-668-\tif (err)\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/i915/display/vlv_dsi_pll.c=486=int bxt_dsi_pll_compute(struct intel_encoder *encoder,\n--\ndrivers/gpu/drm/i915/display/vlv_dsi_pll.c-532-\tif (display-\u003eplatform.broxton \u0026\u0026 dsi_ratio \u003c= 50)\ndrivers/gpu/drm/i915/display/vlv_dsi_pll.c:533:\t\tconfig-\u003edsi_pll.ctrl |= BXT_DSI_PLL_PVD_RATIO_1;\ndrivers/gpu/drm/i915/display/vlv_dsi_pll.c-534-\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/dsa/mt7530.c=2002=mt7530_port_vlan_add(struct dsa_switch *ds, int port,\n--\ndrivers/net/dsa/mt7530.c-2031-\ndrivers/net/dsa/mt7530.c:2032:\t\t/* Only configure PVID if VLAN filtering is enabled */\ndrivers/net/dsa/mt7530.c-2033-\t\tif (dsa_port_is_vlan_filtering(dsa_to_port(ds, port)))\n--\ndrivers/net/dsa/vitesse-vsc73xx-core.c=1363=vsc73xx_vlan_change_pvid(struct vsc73xx *vsc, int port, u16 vid, bool set)\n--\ndrivers/net/dsa/vitesse-vsc73xx-core.c-1387- * Update the PVID of a port so that it follows either the bridge PVID\ndrivers/net/dsa/vitesse-vsc73xx-core.c:1388: * configuration, when the bridge is currently VLAN-aware, or the PVID\ndrivers/net/dsa/vitesse-vsc73xx-core.c-1389- * from tag_8021q, when the port is standalone or under a VLAN-unaware\n--\ndrivers/net/ethernet/intel/ice/ice_lib.c=1590=static const struct ice_rss_hash_cfg default_rss_cfgs[] = {\n--\ndrivers/net/ethernet/intel/ice/ice_lib.c-1635-\t\tICE_HASH_SCTP_IPV6, ICE_RSS_OUTER_HEADERS, false},\ndrivers/net/ethernet/intel/ice/ice_lib.c:1636:\t/* configure RSS for IPSEC ESP SPI with input set MAC_IPV4_SPI */\ndrivers/net/ethernet/intel/ice/ice_lib.c-1637-\t{ICE_FLOW_SEG_HDR_ESP,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c=132=mlxsw_sp_nve_vxlan_ul_proto_sip_config(const struct vxlan_config *cfg,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c-136-\tcase AF_INET:\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c:137:\t\tconfig-\u003eul_proto = MLXSW_SP_L3_PROTO_IPV4;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c-138-\t\tconfig-\u003eul_sip.addr4 = cfg-\u003esaddr.sin.sin_addr.s_addr;\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c-140-\tcase AF_INET6:\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c:141:\t\tconfig-\u003eul_proto = MLXSW_SP_L3_PROTO_IPV6;\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_nve_vxlan.c-142-\t\tconfig-\u003eul_sip.addr6 = cfg-\u003esaddr.sin6.sin6_addr;\n--\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c=1858=static int ppe_rss_hash_init(struct ppe_device *ppe_dev)\n--\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c-1890-\t/* Configure RSS seed configs for IPv4 packet. */\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c:1891:\tret = ppe_rss_hash_config_set(ppe_dev, PPE_RSS_HASH_MODE_IPV4, hash_cfg);\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c-1892-\tif (ret)\n--\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c-1900-\t/* Configure RSS seed configs for IPv6 packet. */\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c:1901:\treturn ppe_rss_hash_config_set(ppe_dev, PPE_RSS_HASH_MODE_IPV6, hash_cfg);\ndrivers/net/ethernet/qualcomm/ppe/ppe_config.c-1902-}\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/regulator/pv88080-regulator.c=362=static int pv88080_i2c_probe(struct i2c_client *i2c)\n--\ndrivers/regulator/pv88080-regulator.c-502-\tif (init_data)\ndrivers/regulator/pv88080-regulator.c:503:\t\tconfig.init_data = \u0026init_data[PV88080_ID_HVBUCK];\ndrivers/regulator/pv88080-regulator.c-504-\ndrivers/regulator/pv88080-regulator.c:505:\tconfig.driver_data = (void *)\u0026pv88080_regulator_info[PV88080_ID_HVBUCK];\ndrivers/regulator/pv88080-regulator.c-506-\tchip-\u003erdev[PV88080_ID_HVBUCK] = devm_regulator_register(chip-\u003edev,\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/scsi/qla4xxx/ql4_def.h=856=static inline int is_ipv4_enabled(struct scsi_qla_host *ha)\ndrivers/scsi/qla4xxx/ql4_def.h-857-{\ndrivers/scsi/qla4xxx/ql4_def.h:858:\treturn ((ha-\u003eip_config.ipv4_options \u0026 IPOPT_IPV4_PROTOCOL_ENABLE) != 0);\ndrivers/scsi/qla4xxx/ql4_def.h-859-}\n--\ndrivers/scsi/qla4xxx/ql4_os.c=2001=static void qla4xxx_create_ifaces(struct scsi_qla_host *ha)\ndrivers/scsi/qla4xxx/ql4_os.c-2002-{\ndrivers/scsi/qla4xxx/ql4_os.c:2003:\tif (ha-\u003eip_config.ipv4_options \u0026 IPOPT_IPV4_PROTOCOL_ENABLE)\ndrivers/scsi/qla4xxx/ql4_os.c-2004-\t\tqla4xxx_create_ipv4_iface(ha);\ndrivers/scsi/qla4xxx/ql4_os.c-2005-\ndrivers/scsi/qla4xxx/ql4_os.c:2006:\tif (ha-\u003eip_config.ipv6_options \u0026 IPV6_OPT_IPV6_PROTOCOL_ENABLE)\ndrivers/scsi/qla4xxx/ql4_os.c-2007-\t\tqla4xxx_create_ipv6_iface(ha);\n--\ndrivers/scsi/vmw_pvscsi.c=1298=static u32 pvscsi_get_max_targets(struct pvscsi_adapter *adapter)\n--\ndrivers/scsi/vmw_pvscsi.c-1316-\t/* Fetch config info from the device. */\ndrivers/scsi/vmw_pvscsi.c:1317:\tcmd.configPageAddress = ((u64)PVSCSI_CONFIG_CONTROLLER_ADDRESS) \u003c\u003c 32;\ndrivers/scsi/vmw_pvscsi.c:1318:\tcmd.configPageNum = PVSCSI_CONFIG_PAGE_CONTROLLER;\ndrivers/scsi/vmw_pvscsi.c-1319-\tcmd.cmpAddr = configPagePA;\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--\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 55606
							output: 28
							thoughts: 245
						

**Focusing on Key KVM/s390 Functions**

Right, `CONFIG_KVM` is definitely the relevant starting point, so I can confirm that. Now, let's break down the core functions that I need to keep in mind, and that are critical for my current investigation. The primary ones I should focus on, based on this, are:

*   `kvm_s390_keyop`, and that's accessed through `kvm_arch_vm_ioctl`.
*   `kvm_s390_vm_set_migration` – also through `kvm_arch_vm_ioctl`, of course.
*   `kvm_arch_vcpu_create`
*   `kvm_arch_vcpu_ioctl_run`
*   `kvm_arch_vcpu_ioctl`
*   `kvm_arch_commit_memory_region`
*   `kvm_s390_handle_b2`
*   `kvm_s390_handle_b9`

Hang on a moment... I see that `kvm_s390_pv_destroy_cpu` and `kvm_s390_pv_create_cpu` are called internally from `kvm_s390_cpus_from_pv` and `kvm_s390_cpus_to_pv`. That's important. I need to make sure I trace back to the entry points of *those* functions too, so I understand how we're dealing with the PVs. That's the next step.

{
  "Expression": "kvm_s390_cpus_from_pv"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2348=static int kvm_s390_set_cmma_bits(struct kvm *kvm,\n--\narch/s390/kvm/kvm-s390.c-2393-/**\narch/s390/kvm/kvm-s390.c:2394: * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to\narch/s390/kvm/kvm-s390.c-2395- * non protected.\n--\narch/s390/kvm/kvm-s390.c-2405- */\narch/s390/kvm/kvm-s390.c:2406:int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\narch/s390/kvm/kvm-s390.c-2407-{\n--\narch/s390/kvm/kvm-s390.c=2447=static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/kvm-s390.c-2466-\tif (r)\narch/s390/kvm/kvm-s390.c:2467:\t\tkvm_s390_cpus_from_pv(kvm, \u0026dummy, \u0026dummy);\narch/s390/kvm/kvm-s390.c-2468-\treturn r;\n--\narch/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-2626-\narch/s390/kvm/kvm-s390.c:2627:\t\tr = kvm_s390_cpus_from_pv(kvm, \u0026cmd-\u003erc, \u0026cmd-\u003errc);\narch/s390/kvm/kvm-s390.c-2628-\t\t/*\n--\narch/s390/kvm/kvm-s390.c-2651-\narch/s390/kvm/kvm-s390.c:2652:\t\tr = kvm_s390_cpus_from_pv(kvm, \u0026cmd-\u003erc, \u0026cmd-\u003errc);\narch/s390/kvm/kvm-s390.c-2653-\t\t/*\n--\narch/s390/kvm/kvm-s390.h=469=__u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:470:int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc);\narch/s390/kvm/kvm-s390.h-471-int __kvm_s390_mprotect_many(struct gmap *gmap, gpa_t gpa, u8 npages, unsigned int prot,\n--\narch/s390/kvm/pv.c=685=static void kvm_s390_pv_mmu_notifier_release(struct mmu_notifier *subscription,\n--\narch/s390/kvm/pv.c-698-\t */\narch/s390/kvm/pv.c:699:\tr = kvm_s390_cpus_from_pv(kvm, \u0026dummy, \u0026dummy);\narch/s390/kvm/pv.c-700-\tif (!r \u0026\u0026 is_destroy_fast_available() \u0026\u0026 kvm_s390_pv_get_handle(kvm))\n"
}

gemini-3.1-pro-preview

null

null

							input: 57339
							output: 28
							thoughts: 42
						

Okay, here's my take on those thoughts, framed from the perspective of an expert in the field:

**Diving into the PV Command Handler**

Right, `kvm_s390_handle_pv`. That's the entry point, the first place execution hits for any paravirtualized (PV) command within the KVM/s390 context. So, anything that's going to interact with the underlying host architecture through PV mechanisms… this is where it all begins. It's the gatekeeper, essentially.

Now, my next thought is naturally: what comes *after* that? Where does it go? The logical follow-up, then, is to immediately check the function `kvm_s390_cpus_to_pv`. That's where I need to look to understand the immediate control flow. What actions is it taking on the CPU side? That's the next step in tracing this flow. I expect `kvm_s390_cpus_to_pv` to manage the interactions between logical CPUs and the PV mechanism.

{
  "Expression": "kvm_s390_cpus_to_pv"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2406=int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/kvm-s390.c-2436-/**\narch/s390/kvm/kvm-s390.c:2437: * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM\narch/s390/kvm/kvm-s390.c-2438- * to protected.\n--\narch/s390/kvm/kvm-s390.c-2446- */\narch/s390/kvm/kvm-s390.c:2447:static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\narch/s390/kvm/kvm-s390.c-2448-{\n--\narch/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-2613-\narch/s390/kvm/kvm-s390.c:2614:\t\tr = kvm_s390_cpus_to_pv(kvm, \u0026cmd-\u003erc, \u0026cmd-\u003errc);\narch/s390/kvm/kvm-s390.c-2615-\t\tif (r)\n"
}

gemini-3.1-pro-preview

null

null

							input: 58123
							output: 37
							thoughts: 437
						

**Focusing on KVM/s390 Specifics**

Okay, so I'm diving into this KVM/s390 code, and `kvm_s390_handle_pv` is the entry point, the main focus. I need to get a handle on the key functions here. Initially, I identified `kvm_arch_vm_ioctl`, `kvm_arch_vcpu_create`, `kvm_arch_vcpu_ioctl_run`, `kvm_arch_vcpu_ioctl`, `kvm_arch_commit_memory_region`, `kvm_s390_handle_b2`, `kvm_s390_handle_b9`, and of course, `kvm_s390_handle_pv`.

But wait, the instructions are to avoid generic hot-path functions, to prevent biased test distributions. That means I need to dig deeper into the specific handlers within those broader functions.  Let's refine this.

For `kvm_arch_vm_ioctl`, I'll specifically focus on: `kvm_s390_vm_set_attr` (which further calls `kvm_s390_vm_set_migration`), `kvm_s390_handle_pv` (this is important), `kvm_s390_set_cmma_bits`, `kvm_s390_get_cmma_bits`, `kvm_s390_set_skeys`, and `kvm_s390_get_skeys`.

And for `kvm_arch_vcpu_ioctl`, the core is `kvm_s390_vcpu_setup` (called from `kvm_arch_vcpu_create`).

Now, I'll pay some attention to `kvm_s390_set_cmma_bits` and `kvm_s390_get_cmma_bits` as well. They should be interesting.

{
  "Expression": "^(int|void|long|static).* kvm_s390_set_cmma_bits"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2291=static int kvm_s390_get_cmma_bits(struct kvm *kvm,\n--\narch/s390/kvm/kvm-s390.c-2347- */\narch/s390/kvm/kvm-s390.c:2348:static int kvm_s390_set_cmma_bits(struct kvm *kvm,\narch/s390/kvm/kvm-s390.c-2349-\t\t\t\t  const struct kvm_s390_cmma_log *args)\n"
}

gemini-3.1-pro-preview

null

null

							input: 59230
							output: 37
							thoughts: 20
						

Okay, here's my attempt at summarizing the thought process, as if it were my own, assuming I'm an expert in the field:

**Diving into `kvm_s390_get_cmma_bits`**

Alright, time to dig into `kvm_s390_get_cmma_bits`. Just the name itself tells me we're looking at retrieving some crucial bits related to the Common Memory Management Area (CMMA) for the s390 architecture within the KVM context. This function likely plays a vital role in handling guest memory management and potentially influences things like address translation or memory protection within the virtualized environment. The s390 architecture is unique, so this is going to be interesting; I anticipate that it touches aspects of the addressing model in a way not seen in more common architectures. This may have implications on how a guest behaves in the virtual context. Let's see what’s going on inside. I need to understand exactly which bits it’s responsible for and what they signify in the grand scheme of things.

{
  "Expression": "^(int|void|long|static).* kvm_s390_get_cmma_bits"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2221=static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\n--\narch/s390/kvm/kvm-s390.c-2290- */\narch/s390/kvm/kvm-s390.c:2291:static int kvm_s390_get_cmma_bits(struct kvm *kvm,\narch/s390/kvm/kvm-s390.c-2292-\t\t\t\t  struct kvm_s390_cmma_log *args)\n"
}

gemini-3.1-pro-preview

null

null

							input: 59712
							output: 35
							thoughts: 33
						

Okay, let's dive into this. Here's my take on those functions, as if they're my own immediate thoughts:

**Analyzing `kvm_s390_set_skeys` and `kvm_s390_get_skeys`**

Right, so I need to quickly get a handle on what's going on with `kvm_s390_set_skeys` and `kvm_s390_get_skeys`. Those names are pretty descriptive, so I'm assuming we're dealing with setting and getting storage keys, specifically within the KVM environment for s390 architecture. This likely involves managing the memory access control mechanisms available on that hardware.

`set_skeys` suggests that we're talking about configuring the storage keys for a guest, while `get_skeys` obviously deals with retrieving them. I'll need to check the exact context; are we setting/getting these keys for a specific guest vCPU, or a whole VM, or something else entirely? The specifics will be in the implementation.

I'd expect to see some interaction with the s390 architecture's key management instructions or registers. Probably some bit manipulation is involved, perhaps direct memory access or updates to internal data structures. There could also be some necessary checks for permissions or security context to prevent unauthorized access and modification. A common use case here would be to implement a form of memory protection, isolation or encryption within the virtualized environment.

I want to know where these functions are called from too. What's the high-level flow that triggers these operations? That's going to tell me what the intended purpose is. Are these called on VM startup, migration, or during normal operation? Are they part of a security subsystem? Are they triggered by a hypervisor call, or through a guest driver?

I'll keep a sharp eye out for any potential race conditions, locking mechanisms, or memory safety issues. Especially in `get_skeys` because reading key-based metadata and structures can be highly prone to race conditions if not handled properly. I'll also check how these interact with the overall KVM s390 code, especially the memory management, interrupt handling, and exception handling components. Are they thread-safe?

{
  "Expression": "^(int|void|long|static).* kvm_s390_set_skeys"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2181=static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\n--\narch/s390/kvm/kvm-s390.c-2220-\narch/s390/kvm/kvm-s390.c:2221:static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\narch/s390/kvm/kvm-s390.c-2222-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 60455
							output: 35
							thoughts: 18
						

Okay, let's dive into this. Here's my thought process on checking `kvm_s390_get_skeys`:

**Deconstructing `kvm_s390_get_skeys`**

Right, `kvm_s390_get_skeys`. I need to figure out what this function does within the KVM/s390 context. Given the name, it's likely involved with retrieving *something* related to security keys, or "skeys" as the naming convention suggests, within the S/390 architecture. Given KVM context, this is almost certainly related to virtualized systems, and how the guest is working with the underlying security configuration of the physical hardware.

My immediate questions are:

*   What are these "skeys"? Are they hardware keys, software-defined keys, or something else entirely?
*   What is the *purpose* of getting these keys? Is it for guest access, security validation, or a more esoteric function?
*   Where is this function used? Knowing the callers will shed light on its intended function. Are we looking at control paths, or perhaps security audit and validation?

I'm anticipating that this function will be critical for aspects of how KVM on the S/390 architecture deals with sensitive data. This might be about managing secure memory regions, validating guest access permissions, or perhaps even implementing a form of attestation. I'll need to look at the surrounding code to determine its specific role in the larger system. I'll need to know whether its returning hardware information or a software implementation. I anticipate it will be critical for providing a safe and secure virtualization framework.

{
  "Expression": "^(int|void|long|static).* kvm_s390_get_skeys"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2103=static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)\n--\narch/s390/kvm/kvm-s390.c-2180-\narch/s390/kvm/kvm-s390.c:2181:static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)\narch/s390/kvm/kvm-s390.c-2182-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 61052
							output: 27
							thoughts: 209
						

**Focusing on Key KVM/s390 Functions**

Okay, let's get down to brass tacks. I need to zero in on the core functions that manage the s390 architecture within KVM. Specifically, I need to understand how these functions interact. My initial list includes: `kvm_s390_vm_set_attr`, `kvm_s390_handle_pv`, `kvm_s390_set_cmma_bits`, `kvm_s390_get_cmma_bits`, `kvm_s390_set_skeys`, `kvm_s390_get_skeys`, `kvm_arch_vcpu_create`, `kvm_arch_commit_memory_region`, `kvm_s390_handle_b2`, and `kvm_s390_handle_b9`. I'll need to analyze how they interface with each other to manage the state and resources of the s390 virtual machines.

Wait a second, `kvm_s390_vm_set_attr` is declared as static. This makes me want to verify its scope. Where is it being called from? I'll quickly check if it's being invoked through `kvm_arch_vm_ioctl` to understand where this function fits into the overall KVM ioctl handling for s390 VMs. Knowing the call chain will give me a better handle on the big picture.

{
  "Expression": "kvm_s390_vm_set_attr"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2031=static int kvm_s390_get_topo_change_indication(struct kvm *kvm,\n--\narch/s390/kvm/kvm-s390.c-2043-\narch/s390/kvm/kvm-s390.c:2044:static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)\narch/s390/kvm/kvm-s390.c-2045-{\n--\narch/s390/kvm/kvm-s390.c=2926=int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n--\narch/s390/kvm/kvm-s390.c-2958-\t\t\tbreak;\narch/s390/kvm/kvm-s390.c:2959:\t\tr = kvm_s390_vm_set_attr(kvm, \u0026attr);\narch/s390/kvm/kvm-s390.c-2960-\t\tbreak;\n"
}

gemini-3.1-pro-preview

null

null

							input: 61957
							output: 25
							thoughts: 23
						

Here's my attempt at summarizing the thought process, tailored for an expert audience:

**Analyzing the KVM/s390 Hypercall Handling**

Okay, so the initial affirmative response is clear. Let's delve deeper into the core logic of the `kvm_s390_handle_pv` function. My primary focus here is to understand how the hypervisor interacts with the guest's privileged instructions on the S/390 architecture. I need to quickly recall the typical PV (Problem State Vector) trap handling flow. I'll need to look at how control is transferred, the register save/restore mechanisms, and the crucial distinction between virtual and physical address spaces in this context. Is it the appropriate entry point given the context of the PV? I'm anticipating potential interactions with the CP (Control Program), including the emulation of privileged instructions, and the management of hardware resources. I'll be looking for any signs of optimization, particularly in the trap handling latency. I need to ascertain if the function effectively and securely handles the guest's privileged instruction execution through the PV mechanism.

{
  "Expression": "kvm_s390_handle_pv"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=2447=static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)\n--\narch/s390/kvm/kvm-s390.c-2478- */\narch/s390/kvm/kvm-s390.c:2479:static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info)\narch/s390/kvm/kvm-s390.c-2480-{\n--\narch/s390/kvm/kvm-s390.c=2518=static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd,\n--\narch/s390/kvm/kvm-s390.c-2579-\narch/s390/kvm/kvm-s390.c:2580:static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)\narch/s390/kvm/kvm-s390.c-2581-{\n--\narch/s390/kvm/kvm-s390.c-2765-\narch/s390/kvm/kvm-s390.c:2766:\t\tdata_len = kvm_s390_handle_pv_info(\u0026info);\narch/s390/kvm/kvm-s390.c-2767-\t\tif (data_len \u003c 0) {\n--\narch/s390/kvm/kvm-s390.c=2926=int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)\n--\narch/s390/kvm/kvm-s390.c-3040-\t\t/* must be called without kvm-\u003elock */\narch/s390/kvm/kvm-s390.c:3041:\t\tr = kvm_s390_handle_pv(kvm, \u0026args);\narch/s390/kvm/kvm-s390.c-3042-\t\tif (copy_to_user(argp, \u0026args, sizeof(args))) {\n--\narch/s390/kvm/kvm-s390.c=5436=long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,\n--\narch/s390/kvm/kvm-s390.c-5480-\narch/s390/kvm/kvm-s390.c:5481:static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,\narch/s390/kvm/kvm-s390.c-5482-\t\t\t\t\tstruct kvm_pv_cmd *cmd)\n--\narch/s390/kvm/kvm-s390.c=5523=long kvm_arch_vcpu_ioctl(struct file *filp,\n--\narch/s390/kvm/kvm-s390.c-5725-\narch/s390/kvm/kvm-s390.c:5726:\t\tr = kvm_s390_handle_pv_vcpu_dump(vcpu, \u0026cmd);\narch/s390/kvm/kvm-s390.c-5727-\n"
}

gemini-3.1-pro-preview

null

null

							input: 63215
							output: 26
							thoughts: 24
						

Okay, here's my take on those thoughts, tailored for an expert audience:

**Analyzing `kvm_s390_vcpu_setup`**

Yes, that's correct. I'm going to take a closer look at `kvm_s390_vcpu_setup`. I need to solidify my understanding of its role in the KVM/s390 architecture. I'm especially interested in how it initializes the vCPU context, sets up the guest state, and handles any platform-specific idiosyncrasies. It's a critical entry point. I want to be certain I have a solid grasp of any nuances within that function as I might need to make changes or debug an interaction.

{
  "Expression": "kvm_s390_vcpu_setup"
}

{
  "Output": "arch/s390/kvm/kvm-s390.c=3678=void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-3684-\narch/s390/kvm/kvm-s390.c:3685:int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-3686-{\n--\narch/s390/kvm/kvm-s390.c-3695-\narch/s390/kvm/kvm-s390.c:3696:static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-3697-{\n--\narch/s390/kvm/kvm-s390.c-3704-\narch/s390/kvm/kvm-s390.c:3705:static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)\narch/s390/kvm/kvm-s390.c-3706-{\n--\narch/s390/kvm/kvm-s390.c-3718-\narch/s390/kvm/kvm-s390.c:3719:\tkvm_s390_vcpu_setup_model(vcpu);\narch/s390/kvm/kvm-s390.c-3720-\n--\narch/s390/kvm/kvm-s390.c-3767-\tif (vcpu-\u003ekvm-\u003earch.use_cmma) {\narch/s390/kvm/kvm-s390.c:3768:\t\trc = kvm_s390_vcpu_setup_cmma(vcpu);\narch/s390/kvm/kvm-s390.c-3769-\t\tif (rc)\n--\narch/s390/kvm/kvm-s390.c=3801=int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-3863-\narch/s390/kvm/kvm-s390.c:3864:\trc = kvm_s390_vcpu_setup(vcpu);\narch/s390/kvm/kvm-s390.c-3865-\tif (rc) {\n--\narch/s390/kvm/kvm-s390.h=465=void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h:466:int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu);\narch/s390/kvm/kvm-s390.h-467-void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu);\n"
}

gemini-3.1-pro-preview

null

null

							input: 64339
							output: 18
							thoughts: 267
						

**Analyzing the KVM/s390 Instruction Handling Flow**

Okay, so I'm diving into this KVM/s390 code, starting with `kvm_arch_vcpu_create` as the entry point, naturally. My focus is the instruction handling path, and I'm homing in on performance-critical areas. I see that `kvm_s390_handle_b2` and `kvm_s390_handle_b9` get called from `handle_instruction`, which in turn is called from `kvm_arch_vcpu_ioctl_run`. Since `kvm_arch_vcpu_ioctl_run` is a hot path, listing the functions called directly from it would be a good start for profiling.

However, `kvm_s390_handle_b2` seems to be handling a bunch of different instructions. Ah, the specific ones I'm interested in, based on the recent modifications, are `handle_rrbe` and `handle_essa`. Now, a snag: these are static functions. The prompt reminds me to prefer non-static, non-inlined API entrypoints. Listing static functions might not be optimal, as they could be inlined. I need to check if they're actually inlined by the compiler. Let me verify.

{
  "Expression": "handle_rrbe"
}

{
  "Output": "arch/s390/kvm/priv.c=257=static int handle_iske(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-288-\narch/s390/kvm/priv.c:289:static int handle_rrbe(struct kvm_vcpu *vcpu)\narch/s390/kvm/priv.c-290-{\n--\narch/s390/kvm/priv.c=959=int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/priv.c-979-\tcase 0x2a:\narch/s390/kvm/priv.c:980:\t\treturn handle_rrbe(vcpu);\narch/s390/kvm/priv.c-981-\tcase 0x2b:\n"
}

gemini-3.1-pro-preview

null

null

							input: 65164
							output: 20
							thoughts: 84
						

Here's my thought process, as it stands:

**Analyzing Potential Static, Non-Inlined Code Paths**

Okay, so I'm looking at these seemingly static elements, and I'm pretty sure they *aren't* inlined. The fact that they're called within a `switch` statement in `kvm_s390_handle_b2` is a strong indicator of that. However, just to be absolutely certain, I should probably also include `kvm_s390_handle_b9` in my list of candidates, because, well, it's just good practice to cover all the obvious related code. It's better to be overly cautious than to miss something critical.

Now, let's turn our attention to `handle_mvpg_pei`. I need to dig into that one next and see what's what.

{
  "Expression": "handle_mvpg_pei"
}

{
  "Output": "arch/s390/kvm/intercept.c=303=static int handle_external_interrupt(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-350-/**\narch/s390/kvm/intercept.c:351: * handle_mvpg_pei - Handle MOVE PAGE partial execution interception.\narch/s390/kvm/intercept.c-352- * @vcpu: virtual cpu\n--\narch/s390/kvm/intercept.c-358- */\narch/s390/kvm/intercept.c:359:static int handle_mvpg_pei(struct kvm_vcpu *vcpu)\narch/s390/kvm/intercept.c-360-{\n--\narch/s390/kvm/intercept.c=398=static int handle_partial_execution(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-402-\tif (vcpu-\u003earch.sie_block-\u003eipa == 0xb254)\t/* MVPG */\narch/s390/kvm/intercept.c:403:\t\treturn handle_mvpg_pei(vcpu);\narch/s390/kvm/intercept.c-404-\tif (vcpu-\u003earch.sie_block-\u003eipa \u003e\u003e 8 == 0xae)\t/* SIGP */\n"
}

gemini-3.1-pro-preview

null

null

							input: 65828
							output: 19
							thoughts: 11
						

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Thinking Through Partial Execution**

Alright, so `handle_partial_execution` is static too, huh? That observation brings a few immediate implications to mind, depending on the context. If we're dealing with a multithreaded environment or something similar, that static nature is going to be crucial for thread safety. It suggests that any state information relevant to a partial execution – the results, intermediate steps, perhaps error flags – is either explicitly being managed externally, probably through shared data structures, or that the function itself is stateless and relies solely on its input arguments.

If the goal is to prevent any non-deterministic behavior, this is an elegant solution. The function *itself* doesn't maintain state, eliminating a class of concurrency issues that can be tricky to debug. But this also means that the caller must handle things such as error checking. If we need to allow for the dynamic assignment of things like resources, then this is an important constraint.

However, if we are not in a multithreaded environment, the implications are likely more performance related, because the functions should be able to reuse resources without contention. In this case, we have a guarantee on what is going on at each execution stage and this is great for testing and debugging.

Overall, it reinforces the need to carefully consider how this function interacts with the overall execution flow. Whether it's a deliberate design choice for safety, a performance optimization, or perhaps a constraint imposed by a particular architecture, the static nature of `handle_partial_execution` definitely shapes its role and how we interact with it. I'd need to dive into the codebase a bit more to see how this plays out in practice, but that's my initial assessment.

{
  "Expression": "handle_partial_execution"
}

{
  "Output": "arch/s390/kvm/intercept.c=359=static int handle_mvpg_pei(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-397-\narch/s390/kvm/intercept.c:398:static int handle_partial_execution(struct kvm_vcpu *vcpu)\narch/s390/kvm/intercept.c-399-{\n--\narch/s390/kvm/intercept.c=616=int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-646-\tcase ICPT_PARTEXEC:\narch/s390/kvm/intercept.c:647:\t\trc = handle_partial_execution(vcpu);\narch/s390/kvm/intercept.c-648-\t\tbreak;\n"
}

gemini-3.1-pro-preview

null

null

							input: 66483
							output: 27
							thoughts: 35
						

Here's a summary of my thought process, as if I were analyzing that code snippet:

**Diving into the KVM S390 Intercept**

Okay, so we're starting at `kvm_handle_sie_intercept`, that's our initial entry point. Knowing that function name, it's pretty clear we're dealing with System Interrupt Event (SIE) intercepts within KVM, likely on the S390 architecture. This suggests we're handling events that require the hypervisor's intervention – traps from the guest, essentially.

Now, my mind immediately jumps to `kvm_s390_faultin_gfn`. That name screams "faulting in a Global Frame Number (GFN)" to me. This probably means we are resolving a memory access issue. Perhaps a page fault within the guest, where a virtual address needs to be translated into a physical address, and the hypervisor has to manage this mapping. It is all about memory management.

Given the context of an SIE intercept, the fault probably required a hypervisor action to make the memory page available.

{
  "Expression": "kvm_s390_faultin_gfn"
}

{
  "Output": "arch/s390/kvm/faultin.c=15=bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu);\n--\narch/s390/kvm/faultin.c-17-/*\narch/s390/kvm/faultin.c:18: * kvm_s390_faultin_gfn() - handle a dat fault.\narch/s390/kvm/faultin.c-19- * @vcpu: The vCPU whose gmap is to be fixed up, or NULL if operating on the VM.\n--\narch/s390/kvm/faultin.c-32- */\narch/s390/kvm/faultin.c:33:int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fault *f)\narch/s390/kvm/faultin.c-34-{\n--\narch/s390/kvm/faultin.h-15-\narch/s390/kvm/faultin.h:16:int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fault *f);\narch/s390/kvm/faultin.h-17-int kvm_s390_get_guest_page(struct kvm *kvm, struct guest_fault *f, gfn_t gfn, bool w);\narch/s390/kvm/faultin.h-18-\narch/s390/kvm/faultin.h:19:static inline int kvm_s390_faultin_gfn_simple(struct kvm_vcpu *vcpu, struct kvm *kvm,\narch/s390/kvm/faultin.h-20-\t\t\t\t\t      gfn_t gfn, bool wr)\n--\narch/s390/kvm/faultin.h-23-\narch/s390/kvm/faultin.h:24:\treturn kvm_s390_faultin_gfn(vcpu, kvm, \u0026f);\narch/s390/kvm/faultin.h-25-}\n--\narch/s390/kvm/gaccess.c=882=static int access_guest_page_with_key_gpa(struct kvm *kvm, enum gacc_mode mode, gpa_t gpa,\n--\narch/s390/kvm/gaccess.c-902-\narch/s390/kvm/gaccess.c:903:\trc = kvm_s390_faultin_gfn(NULL, kvm, \u0026fault);\narch/s390/kvm/gaccess.c-904-\tif (rc)\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-1159-\narch/s390/kvm/gaccess.c:1160:\trc = kvm_s390_faultin_gfn(NULL, kvm, \u0026fault);\narch/s390/kvm/gaccess.c-1161-\tif (rc)\n--\narch/s390/kvm/intercept.c=359=static int handle_mvpg_pei(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/intercept.c-385-\tdo {\narch/s390/kvm/intercept.c:386:\t\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(srcaddr), false);\narch/s390/kvm/intercept.c-387-\t} while (rc == -EAGAIN);\n--\narch/s390/kvm/intercept.c-391-\tdo {\narch/s390/kvm/intercept.c:392:\t\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(dstaddr), true);\narch/s390/kvm/intercept.c-393-\t} while (rc == -EAGAIN);\n--\narch/s390/kvm/kvm-s390.c=4335=static int kvm_s390_fixup_prefix(struct kvm_vcpu *vcpu)\n--\narch/s390/kvm/kvm-s390.c-4344-\narch/s390/kvm/kvm-s390.c:4345:\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn, true);\narch/s390/kvm/kvm-s390.c-4346-\tif (rc)\narch/s390/kvm/kvm-s390.c-4347-\t\treturn rc;\narch/s390/kvm/kvm-s390.c:4348:\trc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn + 1, true);\narch/s390/kvm/kvm-s390.c-4349-\tif (rc)\n--\narch/s390/kvm/kvm-s390.c=4636=static int vcpu_dat_fault_handler(struct kvm_vcpu *vcpu, gpa_t gaddr, bool wr)\n--\narch/s390/kvm/kvm-s390.c-4647-\narch/s390/kvm/kvm-s390.c:4648:\trc = kvm_s390_faultin_gfn(vcpu, NULL, \u0026f);\narch/s390/kvm/kvm-s390.c-4649-\tif (rc \u003c= 0)\n--\narch/s390/kvm/kvm-s390.c=5523=long kvm_arch_vcpu_ioctl(struct file *filp,\n--\narch/s390/kvm/kvm-s390.c-5644-\narch/s390/kvm/kvm-s390.c:5645:\t\t\tr = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(gaddr), false);\narch/s390/kvm/kvm-s390.c-5646-\t\t\tif (r == PGM_ADDRESSING)\n--\narch/s390/kvm/kvm-s390.c=5889=long kvm_arch_vcpu_pre_fault_memory(struct kvm_vcpu *vcpu, struct kvm_pre_fault_memory *range)\n--\narch/s390/kvm/kvm-s390.c-5897-\narch/s390/kvm/kvm-s390.c:5898:\trc = kvm_s390_faultin_gfn(vcpu, NULL, \u0026f);\narch/s390/kvm/kvm-s390.c-5899-\tif (rc == PGM_ADDRESSING)\n--\narch/s390/kvm/pv.c=147=int kvm_s390_pv_make_secure(struct kvm *kvm, unsigned long gaddr, void *uvcb)\n--\narch/s390/kvm/pv.c-162-\tscoped_guard(mutex, \u0026kvm-\u003earch.pv.import_lock) {\narch/s390/kvm/pv.c:163:\t\trc = kvm_s390_faultin_gfn(NULL, kvm, \u0026f);\narch/s390/kvm/pv.c-164-\n--\narch/s390/kvm/pv.c=791=static int unpack_one(struct kvm *kvm, unsigned long addr, u64 tweak,\n--\narch/s390/kvm/pv.c-807-\tif (ret == -ENXIO) {\narch/s390/kvm/pv.c:808:\t\tret = kvm_s390_faultin_gfn_simple(NULL, kvm, gpa_to_gfn(addr), true);\narch/s390/kvm/pv.c-809-\t\tif (!ret)\n"
}

gemini-3.1-pro-preview

null

null

							input: 69058
							output: 187
							thoughts: 1247
						

**Refining the Target Function List for KVM on s390**

Okay, so I'm thinking about how to best target the KVM changes in this patch for fuzzing. `kvm_s390_faultin_gfn` is mentioned as being called from a few places, and `kvm_arch_vcpu_pre_fault_memory` seems like a good starting point to explore. I need to make a solid list of functions that represent entry points to the modified code.

Let's see, initially, I came up with a list: `kvm_s390_vm_set_attr`, `kvm_s390_handle_pv`, `kvm_s390_set_cmma_bits`, `kvm_s390_get_cmma_bits`, `kvm_s390_set_skeys`, `kvm_s390_get_skeys`, `kvm_arch_vcpu_create`, `kvm_arch_commit_memory_region`, `kvm_s390_handle_b2`, `kvm_s390_handle_b9`, and `kvm_arch_vcpu_pre_fault_memory`.

However, some of those are static. `kvm_s390_vm_set_attr`, `kvm_s390_handle_pv`, `kvm_s390_set_cmma_bits`, `kvm_s390_get_cmma_bits`, `kvm_s390_set_skeys`, and `kvm_s390_get_skeys` are all static and called from `kvm_arch_vm_ioctl`. I want to avoid listing internal helper functions if I can. So, I need to think about what the actual API entry points are.  `kvm_arch_vm_ioctl` and `kvm_arch_vcpu_ioctl` are non-static entry points for the ioctl calls. But, the prompt says "Avoid listing generic hot-path functions," and those are pretty generic ioctl dispatchers. However, I need to make sure I don't exclude important code paths, so let's keep `kvm_arch_vcpu_ioctl_run` since that's modified directly by this patch.

I also need to remember that  `kvm_s390_handle_b2` and `kvm_s390_handle_b9` are instruction handlers. They are reachable when the guest executes certain instructions.

Okay, let's refine the list further. I can list `kvm_arch_vm_ioctl`, `kvm_arch_vcpu_ioctl`, and `kvm_arch_vcpu_ioctl_run`. Also, `kvm_arch_vcpu_create`, `kvm_arch_commit_memory_region`, `kvm_s390_handle_b2`, `kvm_s390_handle_b9`.  It also seems I can list `kvm_s390_handle_pv`.

I think that's a good and solid list. The changes touch core KVM functionality for s390, including memory management, VCPU creation/execution, ioctls, and the handling of certain instructions. `CONFIG_KVM` is the relevant config. The goal is to ensure that a fuzzer has good coverage of the new code, so the answer is `WorthFuzzing=true`.

Here's the final list:

- `kvm_arch_vm_ioctl`
- `kvm_arch_vcpu_ioctl`
- `kvm_arch_vcpu_ioctl_run`
- `kvm_arch_vcpu_create`
- `kvm_arch_commit_memory_region`
- `kvm_s390_handle_b2`
- `kvm_s390_handle_b9`
- `kvm_s390_handle_pv`

Config: `KVM`
WorthFuzzing=true

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "kvm_arch_vm_ioctl",
    "kvm_arch_vcpu_ioctl",
    "kvm_arch_vcpu_ioctl_run",
    "kvm_arch_vcpu_create",
    "kvm_arch_commit_memory_region",
    "kvm_s390_handle_b2",
    "kvm_s390_handle_b9"
  ],
  "Reasoning": "The patch modifies core KVM logic on s390, including memory region commit, VCPU creation/run/ioctl, PV CPU creation/destruction, and instruction interception handling (RRBE, ESSA, MVPG). These changes are reachable via KVM ioctls and guest instruction execution.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "kvm_arch_vm_ioctl",
    "kvm_arch_vcpu_ioctl",
    "kvm_arch_vcpu_ioctl_run",
    "kvm_arch_vcpu_create",
    "kvm_arch_commit_memory_region",
    "kvm_s390_handle_b2",
    "kvm_s390_handle_b9"
  ],
  "Reasoning": "The patch modifies core KVM logic on s390, including memory region commit, VCPU creation/run/ioctl, PV CPU creation/destruction, and instruction interception handling (RRBE, ESSA, MVPG). These changes are reachable via KVM ioctls and guest instruction execution.",
  "WorthFuzzing": true
}