AI Trajectory

Trajectory: (Expand/Collapse All)
Seq	Timestamp	Type	Name	Duration
0/0	2026/08/06 20:34	flow	patch-triage	0m Args: null Results: { "EnableConfigs": [ "KVM", "KVM_INTEL" ], "FocusSymbols": [ "kvm_apic_set_eoi_accelerated", "handle_apic_eoi_induced" ], "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.", "WorthFuzzing": true }
1/1	2026/08/06 20:34	action	read-patch-diff	0m Args: null Results: { "PatchDiff": "commit d8e0a47eddf79ef8c8829563d6cfb2ab315c2a28\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate: Thu Aug 6 20:34:08 2026 +0000\n\n syz-cluster: applied patch under review\n\ndiff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h\nindex 283847619ff88..9614314fd2374 100644\n--- a/arch/x86/include/asm/kvm_host.h\n+++ b/arch/x86/include/asm/kvm_host.h\n@@ -973,7 +973,7 @@ struct kvm_vcpu_arch {\n \t\tbool pv_unhalted;\n \t} pv;\n \n-\tint pending_ioapic_eoi;\n+\tu8 pending_ioapic_eoi;\n \tint pending_external_vector;\n \tint highest_stale_pending_ioapic_eoi;\n \ndiff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c\nindex 586a5cee29e1a..87bb8e5f4ca1f 100644\n--- a/arch/x86/kvm/lapic.c\n+++ b/arch/x86/kvm/lapic.c\n@@ -1552,7 +1552,7 @@ static bool kvm_ioapic_handles_vector(struct kvm_lapic apic, int vector)\n \treturn test_bit(vector, apic-\u003evcpu-\u003earch.ioapic_handled_vectors);\n }\n \n-static void kvm_ioapic_send_eoi(struct kvm_lapic apic, int vector)\n+static void kvm_ioapic_send_eoi(struct kvm_lapic apic, u8 vector)\n {\n \tint __maybe_unused trigger_mode;\n \n@@ -1622,7 +1622,7 @@ static int apic_set_eoi(struct kvm_lapic apic)\n * this interface assumes a trap-like exit, which has already finished\n * desired side effect including vISR and vPPR update.\n /\n-void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, int vector)\n+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, u8 vector)\n {\n \tstruct kvm_lapic apic = vcpu-\u003earch.apic;\n \ndiff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h\nindex bd1098c89d998..db071d0b172d0 100644\n--- a/arch/x86/kvm/lapic.h\n+++ b/arch/x86/kvm/lapic.h\n@@ -177,7 +177,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu vcpu);\n void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu vcpu, u64 data);\n \n void kvm_apic_write_nodecode(struct kvm_vcpu vcpu, u32 offset);\n-void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, int vector);\n+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, u8 vector);\n \n int kvm_lapic_set_vapic_addr(struct kvm_vcpu vcpu, gpa_t vapic_addr);\n void kvm_lapic_sync_from_vapic(struct kvm_vcpu vcpu);\ndiff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c\nindex e3bfe6aca1a0e..c1fdfccd20faa 100644\n--- a/arch/x86/kvm/vmx/vmx.c\n+++ b/arch/x86/kvm/vmx/vmx.c\n@@ -5886,10 +5886,9 @@ static int handle_apic_access(struct kvm_vcpu vcpu)\n static int handle_apic_eoi_induced(struct kvm_vcpu vcpu)\n {\n \tunsigned long exit_qualification = vmx_get_exit_qual(vcpu);\n-\tint vector = exit_qualification \u0026 0xff;\n \n \t/ EOI-induced VM exit is trap-like and thus no need to adjust IP /\n-\tkvm_apic_set_eoi_accelerated(vcpu, vector);\n+\tkvm_apic_set_eoi_accelerated(vcpu, exit_qualification \u0026 0xff);\n \treturn 1;\n }\n \ndiff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c\nindex d94b59140c452..8b23f342a1fa5 100644\n--- a/arch/x86/kvm/x86.c\n+++ b/arch/x86/kvm/x86.c\n@@ -8151,7 +8151,6 @@ static int vcpu_enter_guest(struct kvm_vcpu vcpu)\n \t\tif (kvm_check_request(KVM_REQ_NMI, vcpu))\n \t\t\tprocess_nmi(vcpu);\n \t\tif (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) {\n-\t\t\tBUG_ON(vcpu-\u003earch.pending_ioapic_eoi \u003e 255);\n \t\t\tif (test_bit(vcpu-\u003earch.pending_ioapic_eoi,\n \t\t\t\t vcpu-\u003earch.ioapic_handled_vectors)) {\n \t\t\t\tvcpu-\u003erun-\u003eexit_reason = KVM_EXIT_IOAPIC_EOI;\n" }
2/1	2026/08/06 20:34	agent	patch-evaluator	0m Model: best-expensive Args: null Results: { "EnableConfigs": [ "KVM", "KVM_INTEL" ], "FocusSymbols": [ "kvm_apic_set_eoi_accelerated", "handle_apic_eoi_induced" ], "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.", "WorthFuzzing": true } Instruction: You are an expert Linux kernel maintainer. Your job is to review a provided patch series and determine if it makes functional changes to the kernel that should be fuzzed. IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively use your code access tools to examine the actual source code and confirm any assumptions. Return WorthFuzzing=false if the patch only contains: - Modifications to Documentation/, Kconfig files, or code comments. - Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints. - Changes to numeric constants or macros that do not functionally alter execution flow. - Code paths that are impossible to reach in virtualized environments like GCE or QEMU, even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim). - Code in vendor-specific PCIe switch, SmartNIC, or GPU drivers (e.g., mlxsw, pds_core, qed, ionic, amdgpu) that require physical PCIe hardware cards not emulated in standard QEMU. - Driver .remove, .shutdown, or pci_unregister_driver teardown callbacks (e.g., igb_remove) that are executed only during PCI hot-unplug or sysfs driver unbind operations. If it modifies reachable core kernel logic, drivers, or architectures, use your code search tools to verify the code can be executed, then return WorthFuzzing=true. When returning WorthFuzzing=true, you MUST ALSO: 1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols. Avoid listing generic hot-path functions to prevent skewed test distributions. Prefer non-static, non-inlined API entrypoint functions over internal static helper functions (which are inlined by the compiler and do not have distinct symbol addresses). 2. Identify any specific CONFIG_ options required to properly test this new/modified feature. Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions. Also check "depends on" lines in Kconfig to include any non-standard parent subsystem configs needed for Kbuild to compile the code statically into vmlinux. List them in the EnableConfigs output array, and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4"). Prefer calling several tools at the same time to save round-trips. Use set-results tool to provide results of the analysis. It must be called exactly once before the final reply. Ignore results of this tool. Prompt: For your convenience, here is the diff of the changes: commit d8e0a47eddf79ef8c8829563d6cfb2ab315c2a28 Author: syz-cluster <triage@syzkaller.com> Date: Thu Aug 6 20:34:08 2026 +0000 syz-cluster: applied patch under review diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 283847619ff88..9614314fd2374 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -973,7 +973,7 @@ struct kvm_vcpu_arch { bool pv_unhalted; } pv; - int pending_ioapic_eoi; + u8 pending_ioapic_eoi; int pending_external_vector; int highest_stale_pending_ioapic_eoi; diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index 586a5cee29e1a..87bb8e5f4ca1f 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -1552,7 +1552,7 @@ static bool kvm_ioapic_handles_vector(struct kvm_lapic apic, int vector) return test_bit(vector, apic->vcpu->arch.ioapic_handled_vectors); } -static void kvm_ioapic_send_eoi(struct kvm_lapic apic, int vector) +static void kvm_ioapic_send_eoi(struct kvm_lapic apic, u8 vector) { int __maybe_unused trigger_mode; @@ -1622,7 +1622,7 @@ static int apic_set_eoi(struct kvm_lapic apic) * this interface assumes a trap-like exit, which has already finished * desired side effect including vISR and vPPR update. / -void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, int vector) +void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, u8 vector) { struct kvm_lapic apic = vcpu->arch.apic; diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index bd1098c89d998..db071d0b172d0 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -177,7 +177,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu vcpu); void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu vcpu, u64 data); void kvm_apic_write_nodecode(struct kvm_vcpu vcpu, u32 offset); -void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, int vector); +void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, u8 vector); int kvm_lapic_set_vapic_addr(struct kvm_vcpu vcpu, gpa_t vapic_addr); void kvm_lapic_sync_from_vapic(struct kvm_vcpu vcpu); diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index e3bfe6aca1a0e..c1fdfccd20faa 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -5886,10 +5886,9 @@ static int handle_apic_access(struct kvm_vcpu vcpu) static int handle_apic_eoi_induced(struct kvm_vcpu vcpu) { unsigned long exit_qualification = vmx_get_exit_qual(vcpu); - int vector = exit_qualification & 0xff; / EOI-induced VM exit is trap-like and thus no need to adjust IP / - kvm_apic_set_eoi_accelerated(vcpu, vector); + kvm_apic_set_eoi_accelerated(vcpu, exit_qualification & 0xff); return 1; } diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index d94b59140c452..8b23f342a1fa5 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8151,7 +8151,6 @@ static int vcpu_enter_guest(struct kvm_vcpu vcpu) if (kvm_check_request(KVM_REQ_NMI, vcpu)) process_nmi(vcpu); if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) { - BUG_ON(vcpu->arch.pending_ioapic_eoi > 255); if (test_bit(vcpu->arch.pending_ioapic_eoi, vcpu->arch.ioapic_handled_vectors)) { vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI;
3/2	2026/08/06 20:34	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 3378 output: 27 thoughts: 306 Thoughts: KVM EOI Type and Value Bounding Analysis Okay, so I'm looking at this patch for KVM on x86, and it's essentially a type refinement for EOI (End of Interrupt) handling. Specifically, we're changing the data type of `pending_ioapic_eoi` within the `kvm_vcpu_arch` struct, and the `vector` argument used in `kvm_ioapic_send_eoi` and `kvm_apic_set_eoi_accelerated` from `int` to `u8`. This is important because it inherently bounds the EOI value to a range of 0-255. That also makes the `BUG_ON(vcpu->arch.pending_ioapic_eoi > 255)` in `vcpu_enter_guest` redundant, so that's been removed. Functionally, this is the core of it, the main change is that the value is now explicitly bounded, and a safeguard is removed because it is now redundant. The `handle_apic_eoi_induced` function now passes the lower byte of the `exit_qualification` directly to `kvm_apic_set_eoi_accelerated`. This change feels very clean and makes sense given the type change. Given this, I want to confirm a few things. First I need to check the Kconfig settings. The relevant symbol is `KVM`. Now I will zero in on the key symbols, specifically I will check `kvm_apic_set_eoi_accelerated` and `handle_apic_eoi_induced` again.
4/2	2026/08/06 20:34	tool	grepper	0m Args: { "Expression": "kvm_apic_set_eoi_accelerated" } Results: { "Output": "arch/x86/kvm/lapic.c=1597=static int apic_set_eoi(struct kvm_lapic apic)\n--\narch/x86/kvm/lapic.c-1624- /\narch/x86/kvm/lapic.c:1625:void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, u8 vector)\narch/x86/kvm/lapic.c-1626-{\n--\narch/x86/kvm/lapic.c-1633-}\narch/x86/kvm/lapic.c:1634:EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_apic_set_eoi_accelerated);\narch/x86/kvm/lapic.c-1635-\n--\narch/x86/kvm/lapic.h=179=void kvm_apic_write_nodecode(struct kvm_vcpu vcpu, u32 offset);\narch/x86/kvm/lapic.h:180:void kvm_apic_set_eoi_accelerated(struct kvm_vcpu vcpu, u8 vector);\narch/x86/kvm/lapic.h-181-\n--\narch/x86/kvm/vmx/vmx.c=5886=static int handle_apic_eoi_induced(struct kvm_vcpu vcpu)\n--\narch/x86/kvm/vmx/vmx.c-5890-\t/* EOI-induced VM exit is trap-like and thus no need to adjust IP */\narch/x86/kvm/vmx/vmx.c:5891:\tkvm_apic_set_eoi_accelerated(vcpu, exit_qualification \u0026 0xff);\narch/x86/kvm/vmx/vmx.c-5892-\treturn 1;\n" }
5/2	2026/08/06 20:34	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 4587 output: 17 thoughts: 256 Thoughts: Fuzzing Target Identification: KVM x86 APIC EOI Handling Okay, so this patch is clearly messing with core KVM x86 logic, specifically around how it handles APIC EOI (End of Interrupt) signals. That immediately flags it as a prime target for fuzzing – there's likely some subtle state management or race condition lurking in there that we can expose. The functions touched are `kvm_apic_set_eoi_accelerated`, `handle_apic_eoi_induced`, `kvm_ioapic_send_eoi`, and `vcpu_enter_guest`. Immediately, `vcpu_enter_guest` is a red flag, being a hot path. I'd rather avoid that if possible to minimize noise and focus our efforts. That leaves us with `handle_apic_eoi_induced` and `kvm_apic_set_eoi_accelerated` as the primary focus points. Sounds good! Now, what about `kvm_ioapic_send_eoi`? It's a bit of a question mark since it's static. Let's confirm that quickly... checks code... yep, it's `static void kvm_ioapic_send_eoi`. Since it's static, it's likely inlined, so let's skip that function. The relevant config is `KVM`. Got it.
6/2	2026/08/06 20:34	tool	grepper	0m Args: { "Expression": "config KVM" } Results: { "Output": "arch/arm64/kvm/Kconfig=18=if VIRTUALIZATION\narch/arm64/kvm/Kconfig-19-\narch/arm64/kvm/Kconfig:20:menuconfig KVM\narch/arm64/kvm/Kconfig-21-\tbool \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/loongarch/kvm/Kconfig=18=if VIRTUALIZATION\narch/loongarch/kvm/Kconfig-19-\narch/loongarch/kvm/Kconfig:20:config KVM\narch/loongarch/kvm/Kconfig-21-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/mips/kvm/Kconfig=16=if VIRTUALIZATION\narch/mips/kvm/Kconfig-17-\narch/mips/kvm/Kconfig:18:config KVM\narch/mips/kvm/Kconfig-19-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/mips/kvm/Kconfig-30-\narch/mips/kvm/Kconfig:31:config KVM_MIPS_DEBUG_COP0_COUNTERS\narch/mips/kvm/Kconfig-32-\tbool \"Maintain counters for COP0 accesses\"\n--\narch/powerpc/kvm/Kconfig=18=if VIRTUALIZATION\narch/powerpc/kvm/Kconfig-19-\narch/powerpc/kvm/Kconfig:20:config KVM\narch/powerpc/kvm/Kconfig-21-\tbool\n--\narch/powerpc/kvm/Kconfig-25-\narch/powerpc/kvm/Kconfig:26:config KVM_BOOK3S_HANDLER\narch/powerpc/kvm/Kconfig-27-\tbool\narch/powerpc/kvm/Kconfig-28-\narch/powerpc/kvm/Kconfig:29:config KVM_BOOK3S_32_HANDLER\narch/powerpc/kvm/Kconfig-30-\tbool\n--\narch/powerpc/kvm/Kconfig-33-\narch/powerpc/kvm/Kconfig:34:config KVM_BOOK3S_64_HANDLER\narch/powerpc/kvm/Kconfig-35-\tbool\n--\narch/powerpc/kvm/Kconfig-37-\narch/powerpc/kvm/Kconfig:38:config KVM_BOOK3S_PR_POSSIBLE\narch/powerpc/kvm/Kconfig-39-\tbool\n--\narch/powerpc/kvm/Kconfig-41-\narch/powerpc/kvm/Kconfig:42:config KVM_BOOK3S_HV_POSSIBLE\narch/powerpc/kvm/Kconfig-43-\tbool\narch/powerpc/kvm/Kconfig-44-\narch/powerpc/kvm/Kconfig:45:config KVM_BOOK3S_32\narch/powerpc/kvm/Kconfig-46-\ttristate \"KVM support for PowerPC book3s_32 processors\"\n--\narch/powerpc/kvm/Kconfig-61-\narch/powerpc/kvm/Kconfig:62:config KVM_BOOK3S_64\narch/powerpc/kvm/Kconfig-63-\ttristate \"KVM support for PowerPC book3s_64 processors\"\n--\narch/powerpc/kvm/Kconfig-78-\narch/powerpc/kvm/Kconfig:79:config KVM_BOOK3S_64_HV\narch/powerpc/kvm/Kconfig-80-\ttristate \"KVM for POWER7 and later using hypervisor mode in host\"\n--\narch/powerpc/kvm/Kconfig-99-\narch/powerpc/kvm/Kconfig:100:config KVM_BOOK3S_64_PR\narch/powerpc/kvm/Kconfig-101-\ttristate \"KVM support without using hypervisor mode in host\"\n--\narch/powerpc/kvm/Kconfig-125-\narch/powerpc/kvm/Kconfig:126:config KVM_BOOK3S_HV_EXIT_TIMING\narch/powerpc/kvm/Kconfig-127-\tbool\narch/powerpc/kvm/Kconfig-128-\narch/powerpc/kvm/Kconfig:129:config KVM_BOOK3S_HV_P9_TIMING\narch/powerpc/kvm/Kconfig-130-\tbool \"Detailed timing for the P9 entry point\"\n--\narch/powerpc/kvm/Kconfig-141-\narch/powerpc/kvm/Kconfig:142:config KVM_BOOK3S_HV_P8_TIMING\narch/powerpc/kvm/Kconfig-143-\tbool \"Detailed timing for hypervisor real-mode code (for POWER8)\"\n--\narch/powerpc/kvm/Kconfig-156-\narch/powerpc/kvm/Kconfig:157:config KVM_BOOK3S_HV_NESTED_PMU_WORKAROUND\narch/powerpc/kvm/Kconfig-158-\tbool \"Nested L0 host workaround for L1 KVM host PMU handling bug\" if EXPERT\n--\narch/powerpc/kvm/Kconfig-171-\narch/powerpc/kvm/Kconfig:172:config KVM_BOOK3S_HV_PMU\narch/powerpc/kvm/Kconfig-173-\ttristate \"Hypervisor Perf events for KVM Book3s-HV\"\n--\narch/powerpc/kvm/Kconfig-183-\narch/powerpc/kvm/Kconfig:184:config KVM_BOOKE_HV\narch/powerpc/kvm/Kconfig-185-\tbool\narch/powerpc/kvm/Kconfig-186-\narch/powerpc/kvm/Kconfig:187:config KVM_EXIT_TIMING\narch/powerpc/kvm/Kconfig-188-\tbool \"Detailed exit timing\"\n--\narch/powerpc/kvm/Kconfig-197-\narch/powerpc/kvm/Kconfig:198:config KVM_E500V2\narch/powerpc/kvm/Kconfig-199-\tbool \"KVM support for PowerPC E500v2 processors\"\n--\narch/powerpc/kvm/Kconfig-212-\narch/powerpc/kvm/Kconfig:213:config KVM_E500MC\narch/powerpc/kvm/Kconfig-214-\tbool \"KVM support for PowerPC E500MC/E5500/E6500 processors\"\n--\narch/powerpc/kvm/Kconfig-228-\narch/powerpc/kvm/Kconfig:229:config KVM_MPIC\narch/powerpc/kvm/Kconfig-230-\tbool \"KVM in-kernel MPIC emulation\"\n--\narch/powerpc/kvm/Kconfig-240-\narch/powerpc/kvm/Kconfig:241:config KVM_XICS\narch/powerpc/kvm/Kconfig-242-\tbool \"KVM in-kernel XICS emulation\"\n--\narch/powerpc/kvm/Kconfig-250-\narch/powerpc/kvm/Kconfig:251:config KVM_XIVE\narch/powerpc/kvm/Kconfig-252-\tbool\n--\narch/powerpc/platforms/Kconfig=22=source \"arch/powerpc/platforms/microwatt/Kconfig\"\narch/powerpc/platforms/Kconfig-23-\narch/powerpc/platforms/Kconfig:24:config KVM_GUEST\narch/powerpc/platforms/Kconfig-25-\tbool \"KVM Guest support\"\n--\narch/riscv/kvm/Kconfig=18=if VIRTUALIZATION\narch/riscv/kvm/Kconfig-19-\narch/riscv/kvm/Kconfig:20:config KVM\narch/riscv/kvm/Kconfig-21-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/s390/kvm/Kconfig=17=if VIRTUALIZATION\narch/s390/kvm/Kconfig-18-\narch/s390/kvm/Kconfig:19:config KVM\narch/s390/kvm/Kconfig-20-\tdef_tristate y\n--\narch/s390/kvm/Kconfig-46-\narch/s390/kvm/Kconfig:47:config KVM_S390_UCONTROL\narch/s390/kvm/Kconfig-48-\tbool \"Userspace controlled virtual machines\"\n--\narch/x86/Kconfig=826=source \"arch/x86/xen/Kconfig\"\narch/x86/Kconfig-827-\narch/x86/Kconfig:828:config KVM_GUEST\narch/x86/Kconfig-829-\tbool \"KVM Guest support (including kvmclock)\"\n--\narch/x86/kvm/Kconfig=18=if VIRTUALIZATION\narch/x86/kvm/Kconfig-19-\narch/x86/kvm/Kconfig:20:config KVM_X86\narch/x86/kvm/Kconfig-21-\tdef_tristate KVM if (KVM_INTEL != n \|\| KVM_AMD != n)\n--\narch/x86/kvm/Kconfig-51-\narch/x86/kvm/Kconfig:52:config KVM\narch/x86/kvm/Kconfig-53-\ttristate \"Kernel-based Virtual Machine (KVM) support\"\n--\narch/x86/kvm/Kconfig-68-\narch/x86/kvm/Kconfig:69:config KVM_WERROR\narch/x86/kvm/Kconfig-70-\tbool \"Compile KVM with -Werror\"\n--\narch/x86/kvm/Kconfig-82-\narch/x86/kvm/Kconfig:83:config KVM_SW_PROTECTED_VM\narch/x86/kvm/Kconfig-84-\tbool \"Enable support for KVM software-protected VMs\"\n--\narch/x86/kvm/Kconfig-95-\narch/x86/kvm/Kconfig:96:config KVM_INTEL\narch/x86/kvm/Kconfig-97-\ttristate \"KVM for Intel (and compatible) processors support\"\n--\narch/x86/kvm/Kconfig-106-\narch/x86/kvm/Kconfig:107:config KVM_INTEL_PROVE_VE\narch/x86/kvm/Kconfig-108- bool \"Check that guests do not receive #VE exceptions\"\n--\narch/x86/kvm/Kconfig=122=config X86_SGX_KVM\n--\narch/x86/kvm/Kconfig-133-\narch/x86/kvm/Kconfig:134:config KVM_INTEL_TDX\narch/x86/kvm/Kconfig-135-\tbool \"Intel Trust Domain Extensions (TDX) support\"\n--\narch/x86/kvm/Kconfig-145-\narch/x86/kvm/Kconfig:146:config KVM_AMD\narch/x86/kvm/Kconfig-147-\ttristate \"KVM for AMD processors support\"\n--\narch/x86/kvm/Kconfig-155-\narch/x86/kvm/Kconfig:156:config KVM_AMD_SEV\narch/x86/kvm/Kconfig-157-\tbool \"AMD Secure Encrypted Virtualization (SEV) support\"\n--\narch/x86/kvm/Kconfig-172-\narch/x86/kvm/Kconfig:173:config KVM_IOAPIC\narch/x86/kvm/Kconfig-174-\tbool \"I/O APIC, PIC, and PIT emulation\"\n--\narch/x86/kvm/Kconfig-182-\narch/x86/kvm/Kconfig:183:config KVM_SMM\narch/x86/kvm/Kconfig-184-\tbool \"System Management Mode emulation\"\n--\narch/x86/kvm/Kconfig-193-\narch/x86/kvm/Kconfig:194:config KVM_HYPERV\narch/x86/kvm/Kconfig-195-\tbool \"Support for Microsoft Hyper-V emulation\"\n--\narch/x86/kvm/Kconfig-207-\narch/x86/kvm/Kconfig:208:config KVM_XEN\narch/x86/kvm/Kconfig-209-\tbool \"Support for Xen hypercall interface\"\n--\narch/x86/kvm/Kconfig-216-\narch/x86/kvm/Kconfig:217:config KVM_PROVE_MMU\narch/x86/kvm/Kconfig-218-\tbool \"Prove KVM MMU correctness\"\n--\narch/x86/kvm/Kconfig-229-\narch/x86/kvm/Kconfig:230:config KVM_EXTERNAL_WRITE_TRACKING\narch/x86/kvm/Kconfig-231-\tbool\narch/x86/kvm/Kconfig-232-\narch/x86/kvm/Kconfig:233:config KVM_MAX_NR_VCPUS\narch/x86/kvm/Kconfig-234-\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" }
7/2	2026/08/06 20:34	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 9460 output: 34 thoughts: 47 Thoughts: KVM Configuration: A Deep Dive Okay, so I'm looking at this configuration and it's set to `KVM`. Right, right... but `KVM` is a tristate, and that means it has dependencies. My mind immediately jumps to verifying the dependencies. Specifically, `KVM` relies on `VIRTUALIZATION`. Time to dig deeper into the source, let's go to `arch/x86/kvm/Kconfig` to confirm these dependencies and refresh my memory on the specifics of how this feature is controlled at the architectural level. I need to be sure this is setup as I expect.
8/2	2026/08/06 20:34	tool	grepper	0m Args: { "Expression": "config KVM", "PathPrefix": "arch/x86/kvm/Kconfig" } Results: { "Output": "arch/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-172-\narch/x86/kvm/Kconfig:173:config KVM_IOAPIC\narch/x86/kvm/Kconfig-174-\tbool \"I/O APIC, PIC, and PIT emulation\"\n--\narch/x86/kvm/Kconfig-182-\narch/x86/kvm/Kconfig:183:config KVM_SMM\narch/x86/kvm/Kconfig-184-\tbool \"System Management Mode emulation\"\n--\narch/x86/kvm/Kconfig-193-\narch/x86/kvm/Kconfig:194:config KVM_HYPERV\narch/x86/kvm/Kconfig-195-\tbool \"Support for Microsoft Hyper-V emulation\"\n--\narch/x86/kvm/Kconfig-207-\narch/x86/kvm/Kconfig:208:config KVM_XEN\narch/x86/kvm/Kconfig-209-\tbool \"Support for Xen hypercall interface\"\n--\narch/x86/kvm/Kconfig-216-\narch/x86/kvm/Kconfig:217:config KVM_PROVE_MMU\narch/x86/kvm/Kconfig-218-\tbool \"Prove KVM MMU correctness\"\n--\narch/x86/kvm/Kconfig-229-\narch/x86/kvm/Kconfig:230:config KVM_EXTERNAL_WRITE_TRACKING\narch/x86/kvm/Kconfig-231-\tbool\narch/x86/kvm/Kconfig-232-\narch/x86/kvm/Kconfig:233:config KVM_MAX_NR_VCPUS\narch/x86/kvm/Kconfig-234-\tint \"Maximum number of vCPUs per KVM guest\"\n" }
9/2	2026/08/06 20:34	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 10892 output: 45 thoughts: 71 Thoughts: Analyzing the KVM Configuration Okay, so I'm digging into this KVM stuff, specifically looking at why this `handle_apic_eoi_induced` function is present. My initial instinct, given the function's location in `vmx.c`, points me directly to the `KVM` and `KVM_INTEL` configurations. Since that's the likely configuration, I'll need to check the code that's related. I'm going to take a closer look at `arch/x86/kvm/vmx/vmx.c` and specifically, that `handle_apic_eoi_induced` function. Time to see what's going on in there and understand its role in the virtual machine.
10/2	2026/08/06 20:34	tool	grepper	0m Args: { "Expression": "handle_apic_eoi_induced", "PathPrefix": "arch/x86/kvm/vmx/vmx.c" } Results: { "Output": "arch/x86/kvm/vmx/vmx.c=5864=static int handle_apic_access(struct kvm_vcpu vcpu)\n--\narch/x86/kvm/vmx/vmx.c-5885-\narch/x86/kvm/vmx/vmx.c:5886:static int handle_apic_eoi_induced(struct kvm_vcpu vcpu)\narch/x86/kvm/vmx/vmx.c-5887-{\n--\narch/x86/kvm/vmx/vmx.c=6326=static int (kvm_vmx_exit_handlers[])(struct kvm_vcpu vcpu) = {\n--\narch/x86/kvm/vmx/vmx.c-6354-\t[EXIT_REASON_APIC_WRITE] = handle_apic_write,\narch/x86/kvm/vmx/vmx.c:6355:\t[EXIT_REASON_EOI_INDUCED] = handle_apic_eoi_induced,\narch/x86/kvm/vmx/vmx.c-6356-\t[EXIT_REASON_WBINVD] = kvm_emulate_wbinvd,\n" }
11/2	2026/08/06 20:34	llm	patch-evaluator	0m Model: gemini-3.1-pro-preview Args: null Results: null Tokens: input: 11509 output: 153 thoughts: 327 Thoughts: My Analysis of the KVM Patch's Fuzzing Scope Okay, so the code change targets APIC EOI handling within KVM. I need to pinpoint the relevant configurations and focus symbols for fuzzing this. Let's see... `handle_apic_eoi_induced` is definitely in `vmx.c`, which tells me the `KVM_INTEL` configuration is key since that's where VMX support lives. Good, `KVM` and `KVM_INTEL` are definitely on the list. I also need to see if `KVM_AMD` is relevant since `kvm_apic_set_eoi_accelerated` is being modified. Ah, right, that function lives in `lapic.c` and is used by both VMX and SVM. But `handle_apic_eoi_induced` is specifically VMX, so I can exclude `KVM_AMD`. The important configs here are just `KVM` and `KVM_INTEL`. Wait a minute, `kvm_apic_set_eoi_accelerated` is exported for internal KVM use. Perfect! That makes it a strong candidate as a focus symbol, even though it's used by both VMX and SVM. That's a good place to start. Now, let's recap the rationale for fuzzing this. The patch is changing the data types of `pending_ioapic_eoi` and `vector` in the EOI handling code from `int` to `u8`. It's also removing a `BUG_ON` in `vcpu_enter_guest`. These are functional changes to core KVM logic that is reached during APIC interrupt handling, therefore this needs to be fuzzed. So, to summarize, the focus symbols are: `kvm_apic_set_eoi_accelerated` and `handle_apic_eoi_induced`. The relevant configurations are `KVM` and `KVM_INTEL`. Time to call the set-results function and move forward.
12/2	2026/08/06 20:34	tool	set-results	0m Args: { "EnableConfigs": [ "KVM", "KVM_INTEL" ], "FocusSymbols": [ "kvm_apic_set_eoi_accelerated", "handle_apic_eoi_induced" ], "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.", "WorthFuzzing": true } Results: { "EnableConfigs": [ "KVM", "KVM_INTEL" ], "FocusSymbols": [ "kvm_apic_set_eoi_accelerated", "handle_apic_eoi_induced" ], "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.", "WorthFuzzing": true }

{
  "EnableConfigs": [
    "KVM",
    "KVM_INTEL"
  ],
  "FocusSymbols": [
    "kvm_apic_set_eoi_accelerated",
    "handle_apic_eoi_induced"
  ],
  "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.",
  "WorthFuzzing": true
}

{
  "PatchDiff": "commit d8e0a47eddf79ef8c8829563d6cfb2ab315c2a28\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Thu Aug 6 20:34:08 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h\nindex 283847619ff88..9614314fd2374 100644\n--- a/arch/x86/include/asm/kvm_host.h\n+++ b/arch/x86/include/asm/kvm_host.h\n@@ -973,7 +973,7 @@ struct kvm_vcpu_arch {\n \t\tbool pv_unhalted;\n \t} pv;\n \n-\tint pending_ioapic_eoi;\n+\tu8 pending_ioapic_eoi;\n \tint pending_external_vector;\n \tint highest_stale_pending_ioapic_eoi;\n \ndiff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c\nindex 586a5cee29e1a..87bb8e5f4ca1f 100644\n--- a/arch/x86/kvm/lapic.c\n+++ b/arch/x86/kvm/lapic.c\n@@ -1552,7 +1552,7 @@ static bool kvm_ioapic_handles_vector(struct kvm_lapic *apic, int vector)\n \treturn test_bit(vector, apic-\u003evcpu-\u003earch.ioapic_handled_vectors);\n }\n \n-static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)\n+static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, u8 vector)\n {\n \tint __maybe_unused trigger_mode;\n \n@@ -1622,7 +1622,7 @@ static int apic_set_eoi(struct kvm_lapic *apic)\n  * this interface assumes a trap-like exit, which has already finished\n  * desired side effect including vISR and vPPR update.\n  */\n-void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)\n+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, u8 vector)\n {\n \tstruct kvm_lapic *apic = vcpu-\u003earch.apic;\n \ndiff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h\nindex bd1098c89d998..db071d0b172d0 100644\n--- a/arch/x86/kvm/lapic.h\n+++ b/arch/x86/kvm/lapic.h\n@@ -177,7 +177,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);\n void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data);\n \n void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);\n-void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector);\n+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, u8 vector);\n \n int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);\n void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu);\ndiff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c\nindex e3bfe6aca1a0e..c1fdfccd20faa 100644\n--- a/arch/x86/kvm/vmx/vmx.c\n+++ b/arch/x86/kvm/vmx/vmx.c\n@@ -5886,10 +5886,9 @@ static int handle_apic_access(struct kvm_vcpu *vcpu)\n static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)\n {\n \tunsigned long exit_qualification = vmx_get_exit_qual(vcpu);\n-\tint vector = exit_qualification \u0026 0xff;\n \n \t/* EOI-induced VM exit is trap-like and thus no need to adjust IP */\n-\tkvm_apic_set_eoi_accelerated(vcpu, vector);\n+\tkvm_apic_set_eoi_accelerated(vcpu, exit_qualification \u0026 0xff);\n \treturn 1;\n }\n \ndiff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c\nindex d94b59140c452..8b23f342a1fa5 100644\n--- a/arch/x86/kvm/x86.c\n+++ b/arch/x86/kvm/x86.c\n@@ -8151,7 +8151,6 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)\n \t\tif (kvm_check_request(KVM_REQ_NMI, vcpu))\n \t\t\tprocess_nmi(vcpu);\n \t\tif (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) {\n-\t\t\tBUG_ON(vcpu-\u003earch.pending_ioapic_eoi \u003e 255);\n \t\t\tif (test_bit(vcpu-\u003earch.pending_ioapic_eoi,\n \t\t\t\t     vcpu-\u003earch.ioapic_handled_vectors)) {\n \t\t\t\tvcpu-\u003erun-\u003eexit_reason = KVM_EXIT_IOAPIC_EOI;\n"
}

{
  "EnableConfigs": [
    "KVM",
    "KVM_INTEL"
  ],
  "FocusSymbols": [
    "kvm_apic_set_eoi_accelerated",
    "handle_apic_eoi_induced"
  ],
  "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.",
  "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 d8e0a47eddf79ef8c8829563d6cfb2ab315c2a28
Author: syz-cluster <triage@syzkaller.com>
Date:   Thu Aug 6 20:34:08 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 283847619ff88..9614314fd2374 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -973,7 +973,7 @@ struct kvm_vcpu_arch {
 		bool pv_unhalted;
 	} pv;
 
-	int pending_ioapic_eoi;
+	u8 pending_ioapic_eoi;
 	int pending_external_vector;
 	int highest_stale_pending_ioapic_eoi;
 
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 586a5cee29e1a..87bb8e5f4ca1f 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1552,7 +1552,7 @@ static bool kvm_ioapic_handles_vector(struct kvm_lapic *apic, int vector)
 	return test_bit(vector, apic->vcpu->arch.ioapic_handled_vectors);
 }
 
-static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, int vector)
+static void kvm_ioapic_send_eoi(struct kvm_lapic *apic, u8 vector)
 {
 	int __maybe_unused trigger_mode;
 
@@ -1622,7 +1622,7 @@ static int apic_set_eoi(struct kvm_lapic *apic)
  * this interface assumes a trap-like exit, which has already finished
  * desired side effect including vISR and vPPR update.
  */
-void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector)
+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, u8 vector)
 {
 	struct kvm_lapic *apic = vcpu->arch.apic;
 
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index bd1098c89d998..db071d0b172d0 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -177,7 +177,7 @@ u64 kvm_get_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu);
 void kvm_set_lapic_tscdeadline_msr(struct kvm_vcpu *vcpu, u64 data);
 
 void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);
-void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, int vector);
+void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, u8 vector);
 
 int kvm_lapic_set_vapic_addr(struct kvm_vcpu *vcpu, gpa_t vapic_addr);
 void kvm_lapic_sync_from_vapic(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e3bfe6aca1a0e..c1fdfccd20faa 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5886,10 +5886,9 @@ static int handle_apic_access(struct kvm_vcpu *vcpu)
 static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)
 {
 	unsigned long exit_qualification = vmx_get_exit_qual(vcpu);
-	int vector = exit_qualification & 0xff;
 
 	/* EOI-induced VM exit is trap-like and thus no need to adjust IP */
-	kvm_apic_set_eoi_accelerated(vcpu, vector);
+	kvm_apic_set_eoi_accelerated(vcpu, exit_qualification & 0xff);
 	return 1;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d94b59140c452..8b23f342a1fa5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8151,7 +8151,6 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		if (kvm_check_request(KVM_REQ_NMI, vcpu))
 			process_nmi(vcpu);
 		if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) {
-			BUG_ON(vcpu->arch.pending_ioapic_eoi > 255);
 			if (test_bit(vcpu->arch.pending_ioapic_eoi,
 				     vcpu->arch.ioapic_handled_vectors)) {
 				vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI;

gemini-3.1-pro-preview

							input: 3378
							output: 27
							thoughts: 306

**KVM EOI Type and Value Bounding Analysis**

Okay, so I'm looking at this patch for KVM on x86, and it's essentially a type refinement for EOI (End of Interrupt) handling. Specifically, we're changing the data type of `pending_ioapic_eoi` within the `kvm_vcpu_arch` struct, and the `vector` argument used in `kvm_ioapic_send_eoi` and `kvm_apic_set_eoi_accelerated` from `int` to `u8`. 

This is important because it inherently bounds the EOI value to a range of 0-255. That also makes the `BUG_ON(vcpu->arch.pending_ioapic_eoi > 255)` in `vcpu_enter_guest` redundant, so that's been removed. Functionally, this is the core of it, the main change is that the value is now explicitly bounded, and a safeguard is removed because it is now redundant.

The `handle_apic_eoi_induced` function now passes the lower byte of the `exit_qualification` directly to `kvm_apic_set_eoi_accelerated`. This change feels very clean and makes sense given the type change.

Given this, I want to confirm a few things. First I need to check the Kconfig settings. The relevant symbol is `KVM`. Now I will zero in on the key symbols, specifically I will check `kvm_apic_set_eoi_accelerated` and `handle_apic_eoi_induced` again.

{
  "Expression": "kvm_apic_set_eoi_accelerated"
}

{
  "Output": "arch/x86/kvm/lapic.c=1597=static int apic_set_eoi(struct kvm_lapic *apic)\n--\narch/x86/kvm/lapic.c-1624- */\narch/x86/kvm/lapic.c:1625:void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, u8 vector)\narch/x86/kvm/lapic.c-1626-{\n--\narch/x86/kvm/lapic.c-1633-}\narch/x86/kvm/lapic.c:1634:EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_apic_set_eoi_accelerated);\narch/x86/kvm/lapic.c-1635-\n--\narch/x86/kvm/lapic.h=179=void kvm_apic_write_nodecode(struct kvm_vcpu *vcpu, u32 offset);\narch/x86/kvm/lapic.h:180:void kvm_apic_set_eoi_accelerated(struct kvm_vcpu *vcpu, u8 vector);\narch/x86/kvm/lapic.h-181-\n--\narch/x86/kvm/vmx/vmx.c=5886=static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)\n--\narch/x86/kvm/vmx/vmx.c-5890-\t/* EOI-induced VM exit is trap-like and thus no need to adjust IP */\narch/x86/kvm/vmx/vmx.c:5891:\tkvm_apic_set_eoi_accelerated(vcpu, exit_qualification \u0026 0xff);\narch/x86/kvm/vmx/vmx.c-5892-\treturn 1;\n"
}

gemini-3.1-pro-preview

							input: 4587
							output: 17
							thoughts: 256

**Fuzzing Target Identification: KVM x86 APIC EOI Handling**

Okay, so this patch is clearly messing with core KVM x86 logic, specifically around how it handles APIC EOI (End of Interrupt) signals. That immediately flags it as a prime target for fuzzing – there's likely some subtle state management or race condition lurking in there that we can expose.

The functions touched are `kvm_apic_set_eoi_accelerated`, `handle_apic_eoi_induced`, `kvm_ioapic_send_eoi`, and `vcpu_enter_guest`. Immediately, `vcpu_enter_guest` is a red flag, being a hot path. I'd rather avoid that if possible to minimize noise and focus our efforts.

That leaves us with `handle_apic_eoi_induced` and `kvm_apic_set_eoi_accelerated` as the primary focus points. Sounds good! Now, what about `kvm_ioapic_send_eoi`? It's a bit of a question mark since it's static. Let's confirm that quickly... *checks code*... yep, it's `static void kvm_ioapic_send_eoi`. Since it's static, it's likely inlined, so let's skip that function.

The relevant config is `KVM`. Got it.

{
  "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-172-\narch/x86/kvm/Kconfig:173:config KVM_IOAPIC\narch/x86/kvm/Kconfig-174-\tbool \"I/O APIC, PIC, and PIT emulation\"\n--\narch/x86/kvm/Kconfig-182-\narch/x86/kvm/Kconfig:183:config KVM_SMM\narch/x86/kvm/Kconfig-184-\tbool \"System Management Mode emulation\"\n--\narch/x86/kvm/Kconfig-193-\narch/x86/kvm/Kconfig:194:config KVM_HYPERV\narch/x86/kvm/Kconfig-195-\tbool \"Support for Microsoft Hyper-V emulation\"\n--\narch/x86/kvm/Kconfig-207-\narch/x86/kvm/Kconfig:208:config KVM_XEN\narch/x86/kvm/Kconfig-209-\tbool \"Support for Xen hypercall interface\"\n--\narch/x86/kvm/Kconfig-216-\narch/x86/kvm/Kconfig:217:config KVM_PROVE_MMU\narch/x86/kvm/Kconfig-218-\tbool \"Prove KVM MMU correctness\"\n--\narch/x86/kvm/Kconfig-229-\narch/x86/kvm/Kconfig:230:config KVM_EXTERNAL_WRITE_TRACKING\narch/x86/kvm/Kconfig-231-\tbool\narch/x86/kvm/Kconfig-232-\narch/x86/kvm/Kconfig:233:config KVM_MAX_NR_VCPUS\narch/x86/kvm/Kconfig-234-\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

							input: 9460
							output: 34
							thoughts: 47

**KVM Configuration: A Deep Dive**

Okay, so I'm looking at this configuration and it's set to `KVM`. Right, right... but `KVM` is a tristate, and that means it has dependencies. My mind immediately jumps to verifying the dependencies. Specifically, `KVM` relies on `VIRTUALIZATION`. Time to dig deeper into the source, let's go to `arch/x86/kvm/Kconfig` to confirm these dependencies and refresh my memory on the specifics of how this feature is controlled at the architectural level. I need to be sure this is setup as I expect.

{
  "Expression": "config KVM",
  "PathPrefix": "arch/x86/kvm/Kconfig"
}

{
  "Output": "arch/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-172-\narch/x86/kvm/Kconfig:173:config KVM_IOAPIC\narch/x86/kvm/Kconfig-174-\tbool \"I/O APIC, PIC, and PIT emulation\"\n--\narch/x86/kvm/Kconfig-182-\narch/x86/kvm/Kconfig:183:config KVM_SMM\narch/x86/kvm/Kconfig-184-\tbool \"System Management Mode emulation\"\n--\narch/x86/kvm/Kconfig-193-\narch/x86/kvm/Kconfig:194:config KVM_HYPERV\narch/x86/kvm/Kconfig-195-\tbool \"Support for Microsoft Hyper-V emulation\"\n--\narch/x86/kvm/Kconfig-207-\narch/x86/kvm/Kconfig:208:config KVM_XEN\narch/x86/kvm/Kconfig-209-\tbool \"Support for Xen hypercall interface\"\n--\narch/x86/kvm/Kconfig-216-\narch/x86/kvm/Kconfig:217:config KVM_PROVE_MMU\narch/x86/kvm/Kconfig-218-\tbool \"Prove KVM MMU correctness\"\n--\narch/x86/kvm/Kconfig-229-\narch/x86/kvm/Kconfig:230:config KVM_EXTERNAL_WRITE_TRACKING\narch/x86/kvm/Kconfig-231-\tbool\narch/x86/kvm/Kconfig-232-\narch/x86/kvm/Kconfig:233:config KVM_MAX_NR_VCPUS\narch/x86/kvm/Kconfig-234-\tint \"Maximum number of vCPUs per KVM guest\"\n"
}

gemini-3.1-pro-preview

							input: 10892
							output: 45
							thoughts: 71

**Analyzing the KVM Configuration**

Okay, so I'm digging into this KVM stuff, specifically looking at why this `handle_apic_eoi_induced` function is present. My initial instinct, given the function's location in `vmx.c`, points me directly to the `KVM` and `KVM_INTEL` configurations. Since that's the likely configuration, I'll need to check the code that's related. I'm going to take a closer look at `arch/x86/kvm/vmx/vmx.c` and specifically, that `handle_apic_eoi_induced` function. Time to see what's going on in there and understand its role in the virtual machine.

{
  "Expression": "handle_apic_eoi_induced",
  "PathPrefix": "arch/x86/kvm/vmx/vmx.c"
}

{
  "Output": "arch/x86/kvm/vmx/vmx.c=5864=static int handle_apic_access(struct kvm_vcpu *vcpu)\n--\narch/x86/kvm/vmx/vmx.c-5885-\narch/x86/kvm/vmx/vmx.c:5886:static int handle_apic_eoi_induced(struct kvm_vcpu *vcpu)\narch/x86/kvm/vmx/vmx.c-5887-{\n--\narch/x86/kvm/vmx/vmx.c=6326=static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {\n--\narch/x86/kvm/vmx/vmx.c-6354-\t[EXIT_REASON_APIC_WRITE]              = handle_apic_write,\narch/x86/kvm/vmx/vmx.c:6355:\t[EXIT_REASON_EOI_INDUCED]             = handle_apic_eoi_induced,\narch/x86/kvm/vmx/vmx.c-6356-\t[EXIT_REASON_WBINVD]                  = kvm_emulate_wbinvd,\n"
}

gemini-3.1-pro-preview

							input: 11509
							output: 153
							thoughts: 327

**My Analysis of the KVM Patch's Fuzzing Scope**

Okay, so the code change targets APIC EOI handling within KVM. I need to pinpoint the relevant configurations and focus symbols for fuzzing this. Let's see...

`handle_apic_eoi_induced` is definitely in `vmx.c`, which tells me the `KVM_INTEL` configuration is key since that's where VMX support lives. Good, `KVM` and `KVM_INTEL` are definitely on the list.

I also need to see if `KVM_AMD` is relevant since `kvm_apic_set_eoi_accelerated` is being modified. Ah, right, that function lives in `lapic.c` and is used by both VMX and SVM. But `handle_apic_eoi_induced` is specifically VMX, so I can exclude `KVM_AMD`. The important configs here are just `KVM` and `KVM_INTEL`.

Wait a minute, `kvm_apic_set_eoi_accelerated` is exported for internal KVM use. Perfect! That makes it a strong candidate as a focus symbol, even though it's used by both VMX and SVM. That's a good place to start.

Now, let's recap the rationale for fuzzing this. The patch is changing the data types of `pending_ioapic_eoi` and `vector` in the EOI handling code from `int` to `u8`. It's also removing a `BUG_ON` in `vcpu_enter_guest`. These are functional changes to core KVM logic that is reached during APIC interrupt handling, therefore this needs to be fuzzed.

So, to summarize, the focus symbols are: `kvm_apic_set_eoi_accelerated` and `handle_apic_eoi_induced`. The relevant configurations are `KVM` and `KVM_INTEL`.

Time to call the set-results function and move forward.

{
  "EnableConfigs": [
    "KVM",
    "KVM_INTEL"
  ],
  "FocusSymbols": [
    "kvm_apic_set_eoi_accelerated",
    "handle_apic_eoi_induced"
  ],
  "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "KVM",
    "KVM_INTEL"
  ],
  "FocusSymbols": [
    "kvm_apic_set_eoi_accelerated",
    "handle_apic_eoi_induced"
  ],
  "Reasoning": "The patch modifies the type of `pending_ioapic_eoi` and `vector` arguments in KVM's APIC EOI handling code from `int` to `u8`. It also removes a `BUG_ON` in `vcpu_enter_guest`. These are functional changes in reachable core KVM logic that handles APIC interrupts, so it should be fuzzed.",
  "WorthFuzzing": true
}

LLM Calls Summary:
Total Calls	Total Tokens	Avg Tokens	Total Duration (Seconds)	Avg Duration (Seconds)

Tool Calls Summary:
Total Calls	Total Duration (Seconds)	Avg Duration (Seconds)