AI Trajectory

null

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "vgic_get_irq",
    "vgic_get_vcpu_irq",
    "kvm_vgic_inject_irq"
  ],
  "KMSANReasoning": "The patch addresses a memory leak in vgic-init.c, an out-of-bounds array access and incorrect index calculation in vgic.c, a use-after-free/dangling pointer issue in irq-gic-v5-irs.c by clearing per-cpu pointers before freeing, and adds a missing instruction synchronization barrier (isb) in irq-gic-v5.c. None of these changes involve uninitialized memory, uninitialized variables, or info-leaks to user space. The bugs fixed (OOB, UAF, memory leaks) are well within the scope of KASAN and KMEMLEAK. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false,
  "Reasoning": "The patch fixes critical out-of-bounds array accesses in KVM VGIC IRQ handling (`vgic_get_irq`, `vgic_get_vcpu_irq`), a memory leak in VGIC initialization, and adds a missing memory barrier in the GICv5 driver. These are functional changes in reachable core virtualization and interrupt controller code.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 62cb5dccd5fc6a56f2281e00d93c3d67d6667136\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Mon Aug 10 11:34:36 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c\nindex 907057881b26a..65e203d6a2cf4 100644\n--- a/arch/arm64/kvm/vgic/vgic-init.c\n+++ b/arch/arm64/kvm/vgic/vgic-init.c\n@@ -787,7 +787,8 @@ int kvm_vgic_hyp_init(void)\n \n \tif (has_mask \u0026\u0026 !gic_kvm_info-\u003emaint_irq) {\n \t\tkvm_err(\"No vgic maintenance irq\\n\");\n-\t\treturn -ENXIO;\n+\t\tret = -ENXIO;\n+\t\tgoto out_free;\n \t}\n \n \t/*\n@@ -820,6 +821,7 @@ int kvm_vgic_hyp_init(void)\n \n \tkvm_vgic_global_state.maint_irq = gic_kvm_info-\u003emaint_irq;\n \n+out_free:\n \tkfree(gic_kvm_info);\n \tgic_kvm_info = NULL;\n \ndiff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c\nindex 74bace10a22ed..b25303d9919fd 100644\n--- a/arch/arm64/kvm/vgic/vgic.c\n+++ b/arch/arm64/kvm/vgic/vgic.c\n@@ -93,8 +93,9 @@ struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid)\n \t/* SPIs */\n \tif (intid \u003e= VGIC_NR_PRIVATE_IRQS \u0026\u0026\n \t    intid \u003c (kvm-\u003earch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {\n-\t\tintid = array_index_nospec(intid, kvm-\u003earch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);\n-\t\treturn \u0026kvm-\u003earch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];\n+\t\tintid -= VGIC_NR_PRIVATE_IRQS;\n+\t\tintid = array_index_nospec(intid, kvm-\u003earch.vgic.nr_spis);\n+\t\treturn \u0026kvm-\u003earch.vgic.spis[intid];\n \t}\n \n \t/* LPIs */\n@@ -117,6 +118,8 @@ struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)\n \t\tswitch (type) {\n \t\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\n \t\t\tintid = vgic_v5_get_hwirq_id(intid);\n+\t\t\tif (intid \u003e= VGIC_V5_NR_PRIVATE_IRQS)\n+\t\t\t\treturn NULL;\n \t\t\tintid = array_index_nospec(intid, VGIC_V5_NR_PRIVATE_IRQS);\n \t\t\tbreak;\n \t\tdefault:\ndiff --git a/drivers/irqchip/irq-gic-v5-irs.c b/drivers/irqchip/irq-gic-v5-irs.c\nindex f3fce0b1e25d9..67940ea9e39b7 100644\n--- a/drivers/irqchip/irq-gic-v5-irs.c\n+++ b/drivers/irqchip/irq-gic-v5-irs.c\n@@ -651,6 +651,19 @@ static int __init gicv5_irs_of_init_affinity(struct device_node *node,\n \treturn ret;\n }\n \n+static void __init gicv5_irs_clear_affinity(struct gicv5_irs_chip_data *irs_data)\n+{\n+\tint cpu;\n+\n+\tfor_each_possible_cpu(cpu) {\n+\t\tif (per_cpu(per_cpu_irs_data, cpu) == irs_data) {\n+\t\t\tper_cpu(cpu_iaffid, cpu).iaffid = 0;\n+\t\t\tper_cpu(cpu_iaffid, cpu).valid = false;\n+\t\t\tper_cpu(per_cpu_irs_data, cpu) = NULL;\n+\t\t}\n+\t}\n+}\n+\n static void irs_setup_pri_bits(u32 idr1)\n {\n \tswitch (FIELD_GET(GICV5_IRS_IDR1_PRIORITY_BITS, idr1)) {\n@@ -773,6 +786,7 @@ static int __init gicv5_irs_of_init(struct device_node *node)\n \treturn ret;\n \n out_iomem:\n+\tgicv5_irs_clear_affinity(irs_data);\n \tiounmap(irs_base);\n out_err:\n \tkfree(irs_data);\n@@ -787,6 +801,7 @@ void __init gicv5_irs_remove(void)\n \tgicv5_deinit_lpis();\n \n \tlist_for_each_entry_safe(irs_data, tmp_data, \u0026irs_nodes, entry) {\n+\t\tgicv5_irs_clear_affinity(irs_data);\n \t\tiounmap(irs_data-\u003eirs_base);\n \t\tlist_del(\u0026irs_data-\u003eentry);\n \t\tkfree(irs_data);\n@@ -951,6 +966,7 @@ static int __init gic_acpi_parse_madt_irs(union acpi_subtable_headers *header,\n \treturn 0;\n \n out_map:\n+\tgicv5_irs_clear_affinity(irs_data);\n \tiounmap(irs_base);\n out_release:\n \trelease_mem_region(r-\u003estart, resource_size(r));\ndiff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-gic-v5.c\nindex e9d1795235a66..6a99c541b559b 100644\n--- a/drivers/irqchip/irq-gic-v5.c\n+++ b/drivers/irqchip/irq-gic-v5.c\n@@ -983,6 +983,7 @@ static void gicv5_cpu_disable_interrupts(void)\n \n \tcr0 = FIELD_PREP(ICC_CR0_EL1_EN, 0);\n \twrite_sysreg_s(cr0, SYS_ICC_CR0_EL1);\n+\tisb();\n }\n \n static void gicv5_cpu_enable_interrupts(void)\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "vgic_get_irq",
    "vgic_get_vcpu_irq",
    "kvm_vgic_inject_irq"
  ],
  "Reasoning": "The patch fixes critical out-of-bounds array accesses in KVM VGIC IRQ handling (`vgic_get_irq`, `vgic_get_vcpu_irq`), a memory leak in VGIC initialization, and adds a missing memory barrier in the GICv5 driver. These are functional changes in reachable core virtualization and interrupt controller code.",
  "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 62cb5dccd5fc6a56f2281e00d93c3d67d6667136
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Aug 10 11:34:36 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
index 907057881b26a..65e203d6a2cf4 100644
--- a/arch/arm64/kvm/vgic/vgic-init.c
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -787,7 +787,8 @@ int kvm_vgic_hyp_init(void)
 
 	if (has_mask && !gic_kvm_info->maint_irq) {
 		kvm_err("No vgic maintenance irq\n");
-		return -ENXIO;
+		ret = -ENXIO;
+		goto out_free;
 	}
 
 	/*
@@ -820,6 +821,7 @@ int kvm_vgic_hyp_init(void)
 
 	kvm_vgic_global_state.maint_irq = gic_kvm_info->maint_irq;
 
+out_free:
 	kfree(gic_kvm_info);
 	gic_kvm_info = NULL;
 
diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c
index 74bace10a22ed..b25303d9919fd 100644
--- a/arch/arm64/kvm/vgic/vgic.c
+++ b/arch/arm64/kvm/vgic/vgic.c
@@ -93,8 +93,9 @@ struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid)
 	/* SPIs */
 	if (intid >= VGIC_NR_PRIVATE_IRQS &&
 	    intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
-		intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
-		return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
+		intid -= VGIC_NR_PRIVATE_IRQS;
+		intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis);
+		return &kvm->arch.vgic.spis[intid];
 	}
 
 	/* LPIs */
@@ -117,6 +118,8 @@ struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)
 		switch (type) {
 		case KVM_DEV_TYPE_ARM_VGIC_V5:
 			intid = vgic_v5_get_hwirq_id(intid);
+			if (intid >= VGIC_V5_NR_PRIVATE_IRQS)
+				return NULL;
 			intid = array_index_nospec(intid, VGIC_V5_NR_PRIVATE_IRQS);
 			break;
 		default:
diff --git a/drivers/irqchip/irq-gic-v5-irs.c b/drivers/irqchip/irq-gic-v5-irs.c
index f3fce0b1e25d9..67940ea9e39b7 100644
--- a/drivers/irqchip/irq-gic-v5-irs.c
+++ b/drivers/irqchip/irq-gic-v5-irs.c
@@ -651,6 +651,19 @@ static int __init gicv5_irs_of_init_affinity(struct device_node *node,
 	return ret;
 }
 
+static void __init gicv5_irs_clear_affinity(struct gicv5_irs_chip_data *irs_data)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		if (per_cpu(per_cpu_irs_data, cpu) == irs_data) {
+			per_cpu(cpu_iaffid, cpu).iaffid = 0;
+			per_cpu(cpu_iaffid, cpu).valid = false;
+			per_cpu(per_cpu_irs_data, cpu) = NULL;
+		}
+	}
+}
+
 static void irs_setup_pri_bits(u32 idr1)
 {
 	switch (FIELD_GET(GICV5_IRS_IDR1_PRIORITY_BITS, idr1)) {
@@ -773,6 +786,7 @@ static int __init gicv5_irs_of_init(struct device_node *node)
 	return ret;
 
 out_iomem:
+	gicv5_irs_clear_affinity(irs_data);
 	iounmap(irs_base);
 out_err:
 	kfree(irs_data);
@@ -787,6 +801,7 @@ void __init gicv5_irs_remove(void)
 	gicv5_deinit_lpis();
 
 	list_for_each_entry_safe(irs_data, tmp_data, &irs_nodes, entry) {
+		gicv5_irs_clear_affinity(irs_data);
 		iounmap(irs_data->irs_base);
 		list_del(&irs_data->entry);
 		kfree(irs_data);
@@ -951,6 +966,7 @@ static int __init gic_acpi_parse_madt_irs(union acpi_subtable_headers *header,
 	return 0;
 
 out_map:
+	gicv5_irs_clear_affinity(irs_data);
 	iounmap(irs_base);
 out_release:
 	release_mem_region(r->start, resource_size(r));
diff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-gic-v5.c
index e9d1795235a66..6a99c541b559b 100644
--- a/drivers/irqchip/irq-gic-v5.c
+++ b/drivers/irqchip/irq-gic-v5.c
@@ -983,6 +983,7 @@ static void gicv5_cpu_disable_interrupts(void)
 
 	cr0 = FIELD_PREP(ICC_CR0_EL1_EN, 0);
 	write_sysreg_s(cr0, SYS_ICC_CR0_EL1);
+	isb();
 }
 
 static void gicv5_cpu_enable_interrupts(void)

gemini-3.1-pro-preview

null

null

							input: 3558
							output: 29
							thoughts: 176
						

**Analyzing This Patch**

Okay, so I'm looking at this patch and immediately, I see it's touching some critical areas: `arch/arm64/kvm/vgic/vgic-init.c`, `arch/arm64/kvm/vgic/vgic.c`, `drivers/irqchip/irq-gic-v5-irs.c`, and `drivers/irqchip/irq-gic-v5.c`. My spidey senses are already tingling; any modification to the KVM VGIC and GIC drivers needs careful review. The description mentions it's fixing memory leaks, potential array index out-of-bounds errors, and introducing an `isb()` instruction. Solid functional changes, but I need to dive deeper.

Memory leaks and bounds checks are always good to see addressed, especially in kernel code. An `isb()` implies memory barrier implications, which is important for interrupt handling. All of these fixes require thorough testing.

The reference to GICv5 piques my interest. GICv5, really? I should probably verify that `drivers/irqchip/irq-gic-v5.c` *actually* exists in the kernel and isn't some stale file. A quick check of the kernel tree is in order before proceeding any further.

{
  "Expression": "gicv5",
  "PathPrefix": "drivers/irqchip/"
}

{
  "Output": "\nFull output is too long, showing 500 out of 1645 lines.\nUse more precise expression if possible.\n\ndrivers/irqchip/irq-gic-v5-irs.c-25-\ndrivers/irqchip/irq-gic-v5-irs.c:26:static DEFINE_PER_CPU_READ_MOSTLY(struct gicv5_irs_chip_data *, per_cpu_irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-27-static LIST_HEAD(irs_nodes);\ndrivers/irqchip/irq-gic-v5-irs.c-28-\ndrivers/irqchip/irq-gic-v5-irs.c:29:static u32 irs_readl_relaxed(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-30-\t\t\t     const u32 reg_offset)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-34-\ndrivers/irqchip/irq-gic-v5-irs.c:35:static void irs_writel_relaxed(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-36-\t\t\t       const u32 val, const u32 reg_offset)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-40-\ndrivers/irqchip/irq-gic-v5-irs.c:41:static u64 irs_readq_relaxed(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-42-\t\t\t     const u32 reg_offset)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-46-\ndrivers/irqchip/irq-gic-v5-irs.c:47:static void irs_writeq_relaxed(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-48-\t\t\t       const u64 val, const u32 reg_offset)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-53-/*\ndrivers/irqchip/irq-gic-v5-irs.c:54: * The polling wait (in gicv5_wait_for_op_s_atomic()) on a GIC register\ndrivers/irqchip/irq-gic-v5-irs.c-55- * provides the memory barriers (through MMIO accessors)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-57- */\ndrivers/irqchip/irq-gic-v5-irs.c:58:static int gicv5_irs_ist_synchronise(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-59-{\ndrivers/irqchip/irq-gic-v5-irs.c:60:\treturn gicv5_wait_for_op_atomic(irs_data-\u003eirs_base, GICV5_IRS_IST_STATUSR,\ndrivers/irqchip/irq-gic-v5-irs.c-61-\t\t\t\t\tGICV5_IRS_IST_STATUSR_IDLE, NULL);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-63-\ndrivers/irqchip/irq-gic-v5-irs.c:64:static int __init gicv5_irs_init_ist_linear(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-65-\t\t\t\t\t    unsigned int lpi_id_bits,\n--\ndrivers/irqchip/irq-gic-v5-irs.c-110-\ndrivers/irqchip/irq-gic-v5-irs.c:111:\tgicv5_global_data.ist.l2 = false;\ndrivers/irqchip/irq-gic-v5-irs.c-112-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-116-\ndrivers/irqchip/irq-gic-v5-irs.c:117:\tret = gicv5_irs_ist_synchronise(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-118-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-126-\ndrivers/irqchip/irq-gic-v5-irs.c:127:static int __init gicv5_irs_init_ist_two_level(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-128-\t\t\t\t\t       unsigned int lpi_id_bits,\n--\ndrivers/irqchip/irq-gic-v5-irs.c-164-\t */\ndrivers/irqchip/irq-gic-v5-irs.c:165:\tgicv5_global_data.ist.l2_size = BIT(11 + (2 * l2sz) + 1);\ndrivers/irqchip/irq-gic-v5-irs.c:166:\tgicv5_global_data.ist.l2_bits = (10 - istsz) + (2 * l2sz);\ndrivers/irqchip/irq-gic-v5-irs.c:167:\tgicv5_global_data.ist.l1ist_addr = l1ist;\ndrivers/irqchip/irq-gic-v5-irs.c:168:\tgicv5_global_data.ist.l2 = true;\ndrivers/irqchip/irq-gic-v5-irs.c-169-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-173-\ndrivers/irqchip/irq-gic-v5-irs.c:174:\tret = gicv5_irs_ist_synchronise(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-175-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-188- */\ndrivers/irqchip/irq-gic-v5-irs.c:189:int gicv5_irs_iste_alloc(const u32 lpi)\ndrivers/irqchip/irq-gic-v5-irs.c-190-{\ndrivers/irqchip/irq-gic-v5-irs.c:191:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-192-\tunsigned int index;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-198-\ndrivers/irqchip/irq-gic-v5-irs.c:199:\tif (!gicv5_global_data.ist.l2)\ndrivers/irqchip/irq-gic-v5-irs.c-200-\t\treturn 0;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-205-\ndrivers/irqchip/irq-gic-v5-irs.c:206:\tl2size = gicv5_global_data.ist.l2_size;\ndrivers/irqchip/irq-gic-v5-irs.c:207:\tl2bits = gicv5_global_data.ist.l2_bits;\ndrivers/irqchip/irq-gic-v5-irs.c:208:\tl1ist = gicv5_global_data.ist.l1ist_addr;\ndrivers/irqchip/irq-gic-v5-irs.c-209-\tindex = lpi \u003e\u003e l2bits;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-231-\ndrivers/irqchip/irq-gic-v5-irs.c:232:\tret = gicv5_irs_ist_synchronise(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-233-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-245-\t\t/*\ndrivers/irqchip/irq-gic-v5-irs.c:246:\t\t * gicv5_irs_ist_synchronise() includes memory\ndrivers/irqchip/irq-gic-v5-irs.c-247-\t\t * barriers (MMIO accessors) required to guarantee that the\n--\ndrivers/irqchip/irq-gic-v5-irs.c-268- */\ndrivers/irqchip/irq-gic-v5-irs.c:269:static unsigned int gicv5_irs_l2_sz(u32 idr2)\ndrivers/irqchip/irq-gic-v5-irs.c-270-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c-291-\ndrivers/irqchip/irq-gic-v5-irs.c:292:static int __init gicv5_irs_init_ist(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-293-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c-330-\t */\ndrivers/irqchip/irq-gic-v5-irs.c:331:\tlpi_id_bits = min(lpi_id_bits, gicv5_global_data.cpuif_id_bits);\ndrivers/irqchip/irq-gic-v5-irs.c-332-\ndrivers/irqchip/irq-gic-v5-irs.c-333-\tif (two_levels)\ndrivers/irqchip/irq-gic-v5-irs.c:334:\t\tl2sz = gicv5_irs_l2_sz(idr2);\ndrivers/irqchip/irq-gic-v5-irs.c-335-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-353-\tif (two_levels \u0026\u0026 (lpi_id_bits \u003e ((10 - l2_iste_sz) + (2 * l2sz)))) {\ndrivers/irqchip/irq-gic-v5-irs.c:354:\t\tret = gicv5_irs_init_ist_two_level(irs_data, lpi_id_bits,\ndrivers/irqchip/irq-gic-v5-irs.c-355-\t\t\t\t\t\t   l2_iste_sz, l2sz);\ndrivers/irqchip/irq-gic-v5-irs.c-356-\t} else {\ndrivers/irqchip/irq-gic-v5-irs.c:357:\t\tret = gicv5_irs_init_ist_linear(irs_data, lpi_id_bits,\ndrivers/irqchip/irq-gic-v5-irs.c-358-\t\t\t\t\t\tl2_iste_sz);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-362-\ndrivers/irqchip/irq-gic-v5-irs.c:363:\tgicv5_init_lpis(BIT(lpi_id_bits));\ndrivers/irqchip/irq-gic-v5-irs.c-364-\n--\ndrivers/irqchip/irq-gic-v5-irs.c=373=static DEFINE_PER_CPU(struct iaffid_entry, cpu_iaffid);\ndrivers/irqchip/irq-gic-v5-irs.c-374-\ndrivers/irqchip/irq-gic-v5-irs.c:375:int gicv5_irs_cpu_to_iaffid(int cpuid, u16 *iaffid)\ndrivers/irqchip/irq-gic-v5-irs.c-376-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c-386-\ndrivers/irqchip/irq-gic-v5-irs.c:387:struct gicv5_irs_chip_data *gicv5_irs_lookup_by_spi_id(u32 spi_id)\ndrivers/irqchip/irq-gic-v5-irs.c-388-{\ndrivers/irqchip/irq-gic-v5-irs.c:389:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-390-\tu32 min, max;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-404-\ndrivers/irqchip/irq-gic-v5-irs.c:405:static int gicv5_irs_wait_for_spi_op(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-406-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c-409-\ndrivers/irqchip/irq-gic-v5-irs.c:410:\tret = gicv5_wait_for_op_atomic(irs_data-\u003eirs_base, GICV5_IRS_SPI_STATUSR,\ndrivers/irqchip/irq-gic-v5-irs.c-411-\t\t\t\t       GICV5_IRS_SPI_STATUSR_IDLE, \u0026statusr);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-417-\ndrivers/irqchip/irq-gic-v5-irs.c:418:static int gicv5_irs_wait_for_irs_pe(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-419-\t\t\t\t     bool selr)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-424-\ndrivers/irqchip/irq-gic-v5-irs.c:425:\tret = gicv5_wait_for_op_atomic(irs_data-\u003eirs_base, GICV5_IRS_PE_STATUSR,\ndrivers/irqchip/irq-gic-v5-irs.c-426-\t\t\t\t       GICV5_IRS_PE_STATUSR_IDLE, \u0026statusr);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-435-\ndrivers/irqchip/irq-gic-v5-irs.c:436:static int gicv5_irs_wait_for_pe_selr(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-437-{\ndrivers/irqchip/irq-gic-v5-irs.c:438:\treturn gicv5_irs_wait_for_irs_pe(irs_data, true);\ndrivers/irqchip/irq-gic-v5-irs.c-439-}\ndrivers/irqchip/irq-gic-v5-irs.c-440-\ndrivers/irqchip/irq-gic-v5-irs.c:441:static int gicv5_irs_wait_for_pe_cr0(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-442-{\ndrivers/irqchip/irq-gic-v5-irs.c:443:\treturn gicv5_irs_wait_for_irs_pe(irs_data, false);\ndrivers/irqchip/irq-gic-v5-irs.c-444-}\ndrivers/irqchip/irq-gic-v5-irs.c-445-\ndrivers/irqchip/irq-gic-v5-irs.c:446:int gicv5_spi_irq_set_type(struct irq_data *d, unsigned int type)\ndrivers/irqchip/irq-gic-v5-irs.c-447-{\ndrivers/irqchip/irq-gic-v5-irs.c:448:\tstruct gicv5_irs_chip_data *irs_data = d-\u003echip_data;\ndrivers/irqchip/irq-gic-v5-irs.c-449-\tu32 selr, cfgr;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-474-\tirs_writel_relaxed(irs_data, selr, GICV5_IRS_SPI_SELR);\ndrivers/irqchip/irq-gic-v5-irs.c:475:\tret = gicv5_irs_wait_for_spi_op(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-476-\tif (ret)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-481-\ndrivers/irqchip/irq-gic-v5-irs.c:482:\treturn gicv5_irs_wait_for_spi_op(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-483-}\ndrivers/irqchip/irq-gic-v5-irs.c-484-\ndrivers/irqchip/irq-gic-v5-irs.c:485:static int gicv5_irs_wait_for_idle(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-486-{\ndrivers/irqchip/irq-gic-v5-irs.c:487:\treturn gicv5_wait_for_op_atomic(irs_data-\u003eirs_base, GICV5_IRS_CR0,\ndrivers/irqchip/irq-gic-v5-irs.c-488-\t\t\t\t\tGICV5_IRS_CR0_IDLE, NULL);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-490-\ndrivers/irqchip/irq-gic-v5-irs.c:491:void gicv5_irs_syncr(void)\ndrivers/irqchip/irq-gic-v5-irs.c-492-{\ndrivers/irqchip/irq-gic-v5-irs.c:493:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-494-\tu32 syncr;\ndrivers/irqchip/irq-gic-v5-irs.c-495-\ndrivers/irqchip/irq-gic-v5-irs.c:496:\tirs_data = list_first_entry_or_null(\u0026irs_nodes, struct gicv5_irs_chip_data, entry);\ndrivers/irqchip/irq-gic-v5-irs.c-497-\tif (WARN_ON_ONCE(!irs_data))\n--\ndrivers/irqchip/irq-gic-v5-irs.c-502-\ndrivers/irqchip/irq-gic-v5-irs.c:503:\tgicv5_wait_for_op(irs_data-\u003eirs_base, GICV5_IRS_SYNC_STATUSR,\ndrivers/irqchip/irq-gic-v5-irs.c-504-\t\t\t  GICV5_IRS_SYNC_STATUSR_IDLE);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-506-\ndrivers/irqchip/irq-gic-v5-irs.c:507:int gicv5_irs_register_cpu(int cpuid)\ndrivers/irqchip/irq-gic-v5-irs.c-508-{\ndrivers/irqchip/irq-gic-v5-irs.c:509:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-510-\tu32 selr, cr0;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-513-\ndrivers/irqchip/irq-gic-v5-irs.c:514:\tret = gicv5_irs_cpu_to_iaffid(cpuid, \u0026iaffid);\ndrivers/irqchip/irq-gic-v5-irs.c-515-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-528-\ndrivers/irqchip/irq-gic-v5-irs.c:529:\tret = gicv5_irs_wait_for_pe_selr(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-530-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-537-\ndrivers/irqchip/irq-gic-v5-irs.c:538:\tret = gicv5_irs_wait_for_pe_cr0(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-539-\tif (ret)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-546-\ndrivers/irqchip/irq-gic-v5-irs.c:547:static void __init gicv5_irs_init_bases(struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-548-\t\t\t\t\tvoid __iomem *irs_base,\n--\ndrivers/irqchip/irq-gic-v5-irs.c-591-\tirs_writel_relaxed(irs_data, cr0, GICV5_IRS_CR0);\ndrivers/irqchip/irq-gic-v5-irs.c:592:\tgicv5_irs_wait_for_idle(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-593-}\ndrivers/irqchip/irq-gic-v5-irs.c-594-\ndrivers/irqchip/irq-gic-v5-irs.c:595:static int __init gicv5_irs_of_init_affinity(struct device_node *node,\ndrivers/irqchip/irq-gic-v5-irs.c:596:\t\t\t\t\t     struct gicv5_irs_chip_data *irs_data,\ndrivers/irqchip/irq-gic-v5-irs.c-597-\t\t\t\t\t     u8 iaffid_bits)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-653-\ndrivers/irqchip/irq-gic-v5-irs.c:654:static void __init gicv5_irs_clear_affinity(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-655-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c=667=static void irs_setup_pri_bits(u32 idr1)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-670-\tcase GICV5_IRS_IDR1_PRIORITY_BITS_1BITS:\ndrivers/irqchip/irq-gic-v5-irs.c:671:\t\tgicv5_global_data.irs_pri_bits = 1;\ndrivers/irqchip/irq-gic-v5-irs.c-672-\t\tbreak;\ndrivers/irqchip/irq-gic-v5-irs.c-673-\tcase GICV5_IRS_IDR1_PRIORITY_BITS_2BITS:\ndrivers/irqchip/irq-gic-v5-irs.c:674:\t\tgicv5_global_data.irs_pri_bits = 2;\ndrivers/irqchip/irq-gic-v5-irs.c-675-\t\tbreak;\ndrivers/irqchip/irq-gic-v5-irs.c-676-\tcase GICV5_IRS_IDR1_PRIORITY_BITS_3BITS:\ndrivers/irqchip/irq-gic-v5-irs.c:677:\t\tgicv5_global_data.irs_pri_bits = 3;\ndrivers/irqchip/irq-gic-v5-irs.c-678-\t\tbreak;\ndrivers/irqchip/irq-gic-v5-irs.c-679-\tcase GICV5_IRS_IDR1_PRIORITY_BITS_4BITS:\ndrivers/irqchip/irq-gic-v5-irs.c:680:\t\tgicv5_global_data.irs_pri_bits = 4;\ndrivers/irqchip/irq-gic-v5-irs.c-681-\t\tbreak;\ndrivers/irqchip/irq-gic-v5-irs.c-682-\tcase GICV5_IRS_IDR1_PRIORITY_BITS_5BITS:\ndrivers/irqchip/irq-gic-v5-irs.c:683:\t\tgicv5_global_data.irs_pri_bits = 5;\ndrivers/irqchip/irq-gic-v5-irs.c-684-\t\tbreak;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-687-\t\t\tFIELD_GET(GICV5_IRS_IDR1_PRIORITY_BITS, idr1));\ndrivers/irqchip/irq-gic-v5-irs.c:688:\t\tgicv5_global_data.irs_pri_bits = 1;\ndrivers/irqchip/irq-gic-v5-irs.c-689-\t\tbreak;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-692-\ndrivers/irqchip/irq-gic-v5-irs.c:693:static int __init gicv5_irs_init(struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-694-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c-714-\t\tidr = irs_readl_relaxed(irs_data, GICV5_IRS_IDR0);\ndrivers/irqchip/irq-gic-v5-irs.c:715:\t\tgicv5_global_data.virt_capable = !!FIELD_GET(GICV5_IRS_IDR0_VIRT, idr);\ndrivers/irqchip/irq-gic-v5-irs.c-716-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-722-\t\tspi_count = FIELD_GET(GICV5_IRS_IDR5_SPI_RANGE, idr);\ndrivers/irqchip/irq-gic-v5-irs.c:723:\t\tgicv5_global_data.global_spi_count = spi_count;\ndrivers/irqchip/irq-gic-v5-irs.c-724-\ndrivers/irqchip/irq-gic-v5-irs.c:725:\t\tgicv5_init_lpi_domain();\ndrivers/irqchip/irq-gic-v5-irs.c-726-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-734-\ndrivers/irqchip/irq-gic-v5-irs.c:735:static int __init gicv5_irs_of_init(struct device_node *node)\ndrivers/irqchip/irq-gic-v5-irs.c-736-{\ndrivers/irqchip/irq-gic-v5-irs.c:737:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-738-\tvoid __iomem *irs_base;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-762-\tirs_data-\u003efwnode = of_fwnode_handle(node);\ndrivers/irqchip/irq-gic-v5-irs.c:763:\tgicv5_irs_init_bases(irs_data, irs_base, of_property_read_bool(node, \"dma-noncoherent\"));\ndrivers/irqchip/irq-gic-v5-irs.c-764-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-767-\ndrivers/irqchip/irq-gic-v5-irs.c:768:\tret = gicv5_irs_of_init_affinity(node, irs_data, iaffid_bits);\ndrivers/irqchip/irq-gic-v5-irs.c-769-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-773-\ndrivers/irqchip/irq-gic-v5-irs.c:774:\tret = gicv5_irs_init(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-775-\tif (ret)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-788-out_iomem:\ndrivers/irqchip/irq-gic-v5-irs.c:789:\tgicv5_irs_clear_affinity(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-790-\tiounmap(irs_base);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-795-\ndrivers/irqchip/irq-gic-v5-irs.c:796:void __init gicv5_irs_remove(void)\ndrivers/irqchip/irq-gic-v5-irs.c-797-{\ndrivers/irqchip/irq-gic-v5-irs.c:798:\tstruct gicv5_irs_chip_data *irs_data, *tmp_data;\ndrivers/irqchip/irq-gic-v5-irs.c-799-\ndrivers/irqchip/irq-gic-v5-irs.c:800:\tgicv5_free_lpi_domain();\ndrivers/irqchip/irq-gic-v5-irs.c:801:\tgicv5_deinit_lpis();\ndrivers/irqchip/irq-gic-v5-irs.c-802-\ndrivers/irqchip/irq-gic-v5-irs.c-803-\tlist_for_each_entry_safe(irs_data, tmp_data, \u0026irs_nodes, entry) {\ndrivers/irqchip/irq-gic-v5-irs.c:804:\t\tgicv5_irs_clear_affinity(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-805-\t\tiounmap(irs_data-\u003eirs_base);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-810-\ndrivers/irqchip/irq-gic-v5-irs.c:811:int __init gicv5_irs_enable(void)\ndrivers/irqchip/irq-gic-v5-irs.c-812-{\ndrivers/irqchip/irq-gic-v5-irs.c:813:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-814-\tint ret;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-816-\tirs_data = list_first_entry_or_null(\u0026irs_nodes,\ndrivers/irqchip/irq-gic-v5-irs.c:817:\t\t\t\t\t    struct gicv5_irs_chip_data, entry);\ndrivers/irqchip/irq-gic-v5-irs.c-818-\tif (!irs_data)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-820-\ndrivers/irqchip/irq-gic-v5-irs.c:821:\tret = gicv5_irs_init_ist(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-822-\tif (ret) {\n--\ndrivers/irqchip/irq-gic-v5-irs.c-829-\ndrivers/irqchip/irq-gic-v5-irs.c:830:void __init gicv5_irs_its_probe(void)\ndrivers/irqchip/irq-gic-v5-irs.c-831-{\ndrivers/irqchip/irq-gic-v5-irs.c:832:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-833-\n--\ndrivers/irqchip/irq-gic-v5-irs.c-835-\t\tlist_for_each_entry(irs_data, \u0026irs_nodes, entry)\ndrivers/irqchip/irq-gic-v5-irs.c:836:\t\t\tgicv5_its_of_probe(to_of_node(irs_data-\u003efwnode));\ndrivers/irqchip/irq-gic-v5-irs.c-837-\telse\ndrivers/irqchip/irq-gic-v5-irs.c:838:\t\tgicv5_its_acpi_probe();\ndrivers/irqchip/irq-gic-v5-irs.c-839-}\ndrivers/irqchip/irq-gic-v5-irs.c-840-\ndrivers/irqchip/irq-gic-v5-irs.c:841:int __init gicv5_irs_of_probe(struct device_node *parent)\ndrivers/irqchip/irq-gic-v5-irs.c-842-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c-849-\ndrivers/irqchip/irq-gic-v5-irs.c:850:\t\tret = gicv5_irs_of_init(np);\ndrivers/irqchip/irq-gic-v5-irs.c-851-\t\tif (ret)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-860-#define ACPI_GICV5_IRS_MEM_SIZE (SZ_64K)\ndrivers/irqchip/irq-gic-v5-irs.c:861:static struct gicv5_irs_chip_data *current_irs_data __initdata;\ndrivers/irqchip/irq-gic-v5-irs.c-862-static int current_irsid __initdata = -1;\n--\ndrivers/irqchip/irq-gic-v5-irs.c=865=static int __init gic_acpi_parse_iaffid(union acpi_subtable_headers *header,\n--\ndrivers/irqchip/irq-gic-v5-irs.c-894-\ndrivers/irqchip/irq-gic-v5-irs.c:895:static int __init gicv5_irs_acpi_init_affinity(u32 irsid, struct gicv5_irs_chip_data *irs_data)\ndrivers/irqchip/irq-gic-v5-irs.c-896-{\n--\ndrivers/irqchip/irq-gic-v5-irs.c=921=static int __init gic_acpi_parse_madt_irs(union acpi_subtable_headers *header,\n--\ndrivers/irqchip/irq-gic-v5-irs.c-923-{\ndrivers/irqchip/irq-gic-v5-irs.c:924:\tstruct acpi_madt_gicv5_irs *irs = (struct acpi_madt_gicv5_irs *)header;\ndrivers/irqchip/irq-gic-v5-irs.c:925:\tstruct gicv5_irs_chip_data *irs_data;\ndrivers/irqchip/irq-gic-v5-irs.c-926-\tvoid __iomem *irs_base;\n--\ndrivers/irqchip/irq-gic-v5-irs.c-950-\ndrivers/irqchip/irq-gic-v5-irs.c:951:\tgicv5_irs_init_bases(irs_data, irs_base, irs-\u003eflags \u0026 ACPI_MADT_IRS_NON_COHERENT);\ndrivers/irqchip/irq-gic-v5-irs.c-952-\ndrivers/irqchip/irq-gic-v5-irs.c:953:\tgicv5_irs_acpi_init_affinity(irs-\u003eirs_id, irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-954-\ndrivers/irqchip/irq-gic-v5-irs.c:955:\tret = gicv5_irs_init(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-956-\tif (ret)\n--\ndrivers/irqchip/irq-gic-v5-irs.c-968-out_map:\ndrivers/irqchip/irq-gic-v5-irs.c:969:\tgicv5_irs_clear_affinity(irs_data);\ndrivers/irqchip/irq-gic-v5-irs.c-970-\tiounmap(irs_base);\n--\ndrivers/irqchip/irq-gic-v5-irs.c-977-\ndrivers/irqchip/irq-gic-v5-irs.c:978:int __init gicv5_irs_acpi_probe(void)\ndrivers/irqchip/irq-gic-v5-irs.c-979-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-27-\ndrivers/irqchip/irq-gic-v5-its.c:28:struct gicv5_its_chip_data {\ndrivers/irqchip/irq-gic-v5-its.c-29-\tstruct\txarray\t\t\tits_devices;\n--\ndrivers/irqchip/irq-gic-v5-its.c-31-\tstruct\tfwnode_handle\t\t*fwnode;\ndrivers/irqchip/irq-gic-v5-its.c:32:\tstruct gicv5_its_devtab_cfg\tdevtab_cfgr;\ndrivers/irqchip/irq-gic-v5-its.c-33-\tvoid\t__iomem\t\t\t*its_base;\n--\ndrivers/irqchip/irq-gic-v5-its.c-37-\ndrivers/irqchip/irq-gic-v5-its.c:38:struct gicv5_its_dev {\ndrivers/irqchip/irq-gic-v5-its.c:39:\tstruct gicv5_its_chip_data\t*its_node;\ndrivers/irqchip/irq-gic-v5-its.c:40:\tstruct gicv5_its_itt_cfg\titt_cfg;\ndrivers/irqchip/irq-gic-v5-its.c-41-\tunsigned long\t\t\t*event_map;\n--\ndrivers/irqchip/irq-gic-v5-its.c-46-\ndrivers/irqchip/irq-gic-v5-its.c:47:static u32 its_readl_relaxed(struct gicv5_its_chip_data *its_node, const u32 reg_offset)\ndrivers/irqchip/irq-gic-v5-its.c-48-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-51-\ndrivers/irqchip/irq-gic-v5-its.c:52:static void its_writel_relaxed(struct gicv5_its_chip_data *its_node, const u32 val,\ndrivers/irqchip/irq-gic-v5-its.c-53-\t\t\t       const u32 reg_offset)\n--\ndrivers/irqchip/irq-gic-v5-its.c-57-\ndrivers/irqchip/irq-gic-v5-its.c:58:static void its_writeq_relaxed(struct gicv5_its_chip_data *its_node, const u64 val,\ndrivers/irqchip/irq-gic-v5-its.c-59-\t\t\t       const u32 reg_offset)\n--\ndrivers/irqchip/irq-gic-v5-its.c-63-\ndrivers/irqchip/irq-gic-v5-its.c:64:static void gicv5_its_dcache_clean(struct gicv5_its_chip_data *its, void *start,\ndrivers/irqchip/irq-gic-v5-its.c-65-\t\t\t\t   size_t sz)\n--\ndrivers/irqchip/irq-gic-v5-its.c-74-\ndrivers/irqchip/irq-gic-v5-its.c:75:static void its_write_table_entry(struct gicv5_its_chip_data *its, __le64 *entry,\ndrivers/irqchip/irq-gic-v5-its.c-76-\t\t\t\t  u64 val)\n--\ndrivers/irqchip/irq-gic-v5-its.c-78-\tWRITE_ONCE(*entry, cpu_to_le64(val));\ndrivers/irqchip/irq-gic-v5-its.c:79:\tgicv5_its_dcache_clean(its, entry, sizeof(*entry));\ndrivers/irqchip/irq-gic-v5-its.c-80-}\n--\ndrivers/irqchip/irq-gic-v5-its.c-84-\ndrivers/irqchip/irq-gic-v5-its.c:85:static int gicv5_its_cache_sync(struct gicv5_its_chip_data *its)\ndrivers/irqchip/irq-gic-v5-its.c-86-{\ndrivers/irqchip/irq-gic-v5-its.c:87:\treturn gicv5_wait_for_op_atomic(its-\u003eits_base, GICV5_ITS_STATUSR,\ndrivers/irqchip/irq-gic-v5-its.c-88-\t\t\t\t\tGICV5_ITS_STATUSR_IDLE, NULL);\n--\ndrivers/irqchip/irq-gic-v5-its.c-90-\ndrivers/irqchip/irq-gic-v5-its.c:91:static void gicv5_its_syncr(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c:92:\t\t\t    struct gicv5_its_dev *its_dev)\ndrivers/irqchip/irq-gic-v5-its.c-93-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-100-\ndrivers/irqchip/irq-gic-v5-its.c:101:\tgicv5_wait_for_op(its-\u003eits_base, GICV5_ITS_SYNC_STATUSR, GICV5_ITS_SYNC_STATUSR_IDLE);\ndrivers/irqchip/irq-gic-v5-its.c-102-}\n--\ndrivers/irqchip/irq-gic-v5-its.c-108-\ndrivers/irqchip/irq-gic-v5-its.c:109:static unsigned int gicv5_its_l2sz_to_l2_bits(unsigned int sz)\ndrivers/irqchip/irq-gic-v5-its.c-110-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-121-\ndrivers/irqchip/irq-gic-v5-its.c:122:static int gicv5_its_itt_cache_inv(struct gicv5_its_chip_data *its, u32 device_id,\ndrivers/irqchip/irq-gic-v5-its.c-123-\t\t\t\t   u16 event_id)\n--\ndrivers/irqchip/irq-gic-v5-its.c-135-\ndrivers/irqchip/irq-gic-v5-its.c:136:\treturn gicv5_its_cache_sync(its);\ndrivers/irqchip/irq-gic-v5-its.c-137-}\ndrivers/irqchip/irq-gic-v5-its.c-138-\ndrivers/irqchip/irq-gic-v5-its.c:139:static void gicv5_its_free_itt_linear(struct gicv5_its_dev *its_dev)\ndrivers/irqchip/irq-gic-v5-its.c-140-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-143-\ndrivers/irqchip/irq-gic-v5-its.c:144:static void gicv5_its_free_itt_two_level(struct gicv5_its_dev *its_dev)\ndrivers/irqchip/irq-gic-v5-its.c-145-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-154-\ndrivers/irqchip/irq-gic-v5-its.c:155:static void gicv5_its_free_itt(struct gicv5_its_dev *its_dev)\ndrivers/irqchip/irq-gic-v5-its.c-156-{\ndrivers/irqchip/irq-gic-v5-its.c-157-\tif (!its_dev-\u003eitt_cfg.l2itt)\ndrivers/irqchip/irq-gic-v5-its.c:158:\t\tgicv5_its_free_itt_linear(its_dev);\ndrivers/irqchip/irq-gic-v5-its.c-159-\telse\ndrivers/irqchip/irq-gic-v5-its.c:160:\t\tgicv5_its_free_itt_two_level(its_dev);\ndrivers/irqchip/irq-gic-v5-its.c-161-}\ndrivers/irqchip/irq-gic-v5-its.c-162-\ndrivers/irqchip/irq-gic-v5-its.c:163:static int gicv5_its_create_itt_linear(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c:164:\t\t\t\t       struct gicv5_its_dev *its_dev,\ndrivers/irqchip/irq-gic-v5-its.c-165-\t\t\t\t       unsigned int event_id_bits)\n--\ndrivers/irqchip/irq-gic-v5-its.c-178-\ndrivers/irqchip/irq-gic-v5-its.c:179:\tgicv5_its_dcache_clean(its, itt, num_ents * sizeof(*itt));\ndrivers/irqchip/irq-gic-v5-its.c-180-\n--\ndrivers/irqchip/irq-gic-v5-its.c-188- */\ndrivers/irqchip/irq-gic-v5-its.c:189:static int gicv5_its_create_itt_two_level(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c:190:\t\t\t\t\t  struct gicv5_its_dev *its_dev,\ndrivers/irqchip/irq-gic-v5-its.c-191-\t\t\t\t\t  unsigned int event_id_bits,\n--\ndrivers/irqchip/irq-gic-v5-its.c-200-\ndrivers/irqchip/irq-gic-v5-its.c:201:\tret = gicv5_its_l2sz_to_l2_bits(itt_l2sz);\ndrivers/irqchip/irq-gic-v5-its.c-202-\tif (ret \u003e= event_id_bits) {\n--\ndrivers/irqchip/irq-gic-v5-its.c-254-\ndrivers/irqchip/irq-gic-v5-its.c:255:\t\tgicv5_its_dcache_clean(its, itt_l2, l2sz);\ndrivers/irqchip/irq-gic-v5-its.c-256-\n--\ndrivers/irqchip/irq-gic-v5-its.c-263-\ndrivers/irqchip/irq-gic-v5-its.c:264:\tgicv5_its_dcache_clean(its, itt_l1, num_ents * sizeof(*itt_l1));\ndrivers/irqchip/irq-gic-v5-its.c-265-\n--\ndrivers/irqchip/irq-gic-v5-its.c-284- */\ndrivers/irqchip/irq-gic-v5-its.c:285:static bool gicv5_its_l2sz_two_level(bool devtab, u32 its_idr1, u8 id_bits, u8 *sz)\ndrivers/irqchip/irq-gic-v5-its.c-286-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-332-\ndrivers/irqchip/irq-gic-v5-its.c:333:\tl2_bits = gicv5_its_l2sz_to_l2_bits(l2_sz);\ndrivers/irqchip/irq-gic-v5-its.c-334-\n--\ndrivers/irqchip/irq-gic-v5-its.c-342-\ndrivers/irqchip/irq-gic-v5-its.c:343:static __le64 *gicv5_its_device_get_itte_ref(struct gicv5_its_dev *its_dev,\ndrivers/irqchip/irq-gic-v5-its.c-344-\t\t\t\t\t     u16 event_id)\n--\ndrivers/irqchip/irq-gic-v5-its.c-354-\ndrivers/irqchip/irq-gic-v5-its.c:355:\tl2_bits = gicv5_its_l2sz_to_l2_bits(its_dev-\u003eitt_cfg.l2.l2sz);\ndrivers/irqchip/irq-gic-v5-its.c-356-\tl1_idx = event_id \u003e\u003e l2_bits;\n--\ndrivers/irqchip/irq-gic-v5-its.c-362-\ndrivers/irqchip/irq-gic-v5-its.c:363:static int gicv5_its_device_cache_inv(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c:364:\t\t\t\t      struct gicv5_its_dev *its_dev)\ndrivers/irqchip/irq-gic-v5-its.c-365-{\n--\ndrivers/irqchip/irq-gic-v5-its.c-376-\ndrivers/irqchip/irq-gic-v5-its.c:377:\treturn gicv5_its_cache_sync(its);\ndrivers/irqchip/irq-gic-v5-its.c-378-}\n--\ndrivers/irqchip/irq-gic-v5-its.c-383- */\ndrivers/irqchip/irq-gic-v5-its.c:384:static int gicv5_its_alloc_l2_devtab(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c-385-\t\t\t\t     unsigned int l1_index)\n--\ndrivers/irqchip/irq-gic-v5-its.c-396-\ndrivers/irqchip/irq-gic-v5-its.c:397:\tl2_bits = gicv5_its_l2sz_to_l2_bits(l2sz);\ndrivers/irqchip/irq-gic-v5-its.c-398-\n--\ndrivers/irqchip/irq-gic-v5-its.c-419-\ndrivers/irqchip/irq-gic-v5-its.c:420:static __le64 *gicv5_its_devtab_get_dte_ref(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c-421-\t\t\t\t\t    u32 device_id, bool alloc)\n--\ndrivers/irqchip/irq-gic-v5-its.c-433-\tl2sz = devtab_cfgr_field(its, L2SZ);\ndrivers/irqchip/irq-gic-v5-its.c:434:\tl2_bits = gicv5_its_l2sz_to_l2_bits(l2sz);\ndrivers/irqchip/irq-gic-v5-its.c-435-\tl1_idx = device_id \u003e\u003e l2_bits;\n--\ndrivers/irqchip/irq-gic-v5-its.c-444-\t\t */\ndrivers/irqchip/irq-gic-v5-its.c:445:\t\tret = gicv5_its_alloc_l2_devtab(its, l1_idx);\ndrivers/irqchip/irq-gic-v5-its.c-446-\t\tif (ret)\n--\ndrivers/irqchip/irq-gic-v5-its.c-458- */\ndrivers/irqchip/irq-gic-v5-its.c:459:static int gicv5_its_device_register(struct gicv5_its_chip_data *its,\ndrivers/irqchip/irq-gic-v5-its.c:460:\t\t\t\t     struct gicv5_its_dev *its_dev)\ndrivers/irqchip/irq-gic-v5-its.c-461-{\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 18284
							output: 34
							thoughts: 1140
						

**Analyzing Recent Changes to KVM and GICv5 Interrupt Handling**

Okay, so I'm looking at a diff that contains some modifications to the KVM virtual GIC (VGIC) and GICv5 interrupt controller drivers. I see changes in `arch/arm64/kvm/vgic/vgic.c` and `arch/arm64/kvm/vgic/vgic-init.c`, along with updates to `drivers/irqchip/irq-gic-v5.c` and `drivers/irqchip/irq-gic-v5-irs.c`. I need to figure out the implications of these changes in the context of a virtualized environment. The changes have already been committed, so the key is understanding the modifications rather than debugging code.

First, let's break it down: The updates to `vgic.c` involve changes in `vgic_get_irq` and `vgic_get_vcpu_irq`, which are key functions for mapping interrupt identifiers within the KVM environment. I'm focusing on those two functions, since that's where most of the work seems to be. There seems to be improved bounds checking for interrupt IDs within the KVM VGIC's SPI and LPI handling, which suggests addressing a potential security vulnerability or a source of unexpected behavior. The `vgic_init.c` file includes a slight change to error handling within a maintenance interrupt check.

The `irq-gic-v5.c` changes introduce a `gicv5_cpu_disable_interrupts` function. This indicates modifications to interrupt disabling functionality specific to GICv5 hardware. And in `irq-gic-v5-irs.c`, there's a `gicv5_irs_clear_affinity` function being changed. This seems to be related to clearing CPU affinity during initialization or error scenarios. These changes are crucial for managing interrupt routing and affinity in GICv5 based systems.

Considering these edits as a whole, it appears that these modifications primarily aim to harden the KVM VGIC implementation, specifically when interfacing with GICv5 hardware. This could mean improved security, more robust interrupt handling, and likely improvements in the performance of virtual machines running on systems equipped with GICv5 interrupt controllers. My next step will be to dive into the associated Kconfig options to better understand the conditions under which these changes are applied.

{
  "Expression": "config KVM",
  "PathPrefix": "arch/arm64/kvm/Kconfig"
}

{
  "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"
}

gemini-3.1-pro-preview

null

null

							input: 20074
							output: 36
							thoughts: 11
						

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

**GICv5 Kconfig Exploration**

Alright, time to dive in. My initial thought process is clearly focused on the GICv5 Kconfig. I know we need to thoroughly vet this configuration file. I need to understand its intricacies, how options are defined, dependencies, and default settings. Given the implications of the GICv5 on system performance and security, I can't afford any oversights. I'm thinking about potential gotchas – interactions with other subsystems, potential configuration conflicts, performance trade-offs inherent in different settings, and ensuring it aligns perfectly with our target architecture. I'll be meticulously checking every option, comparing it with the documentation, and cross-referencing it with our platform's specific needs. This Kconfig is key, and I'm ready to get down to it.

{
  "Expression": "config ARM_GIC_V5",
  "PathPrefix": "drivers/irqchip/Kconfig"
}

{
  "Output": "drivers/irqchip/Kconfig=46=config ARM_GIC_V3_ITS\n--\ndrivers/irqchip/Kconfig-53-\ndrivers/irqchip/Kconfig:54:config ARM_GIC_V5\ndrivers/irqchip/Kconfig-55-\tbool\n"
}

gemini-3.1-pro-preview

null

null

							input: 20395
							output: 35
							thoughts: 20
						

Here's a summary of my thought process:

**Investigating ARM GICv5 Selection/Enablement**

Okay, so I need to figure out exactly *how* the system selects or enables the ARM GICv5. I've got a project where that's critical, and I need to understand the control flow. My initial thought is to dive into the code and see where that feature flag, or whatever mechanism is used, actually gets triggered. I need to trace this thing and get my head around the configuration logic. This means understanding the build process, device tree interactions, any relevant kernel config options, and probably some platform-specific code. I'll start with the obvious places, and then I'll follow the breadcrumbs until I've got a complete picture.

{
  "Expression": "ARM_GIC_V5",
  "PathPrefix": "drivers/irqchip/Kconfig"
}

{
  "Output": "drivers/irqchip/Kconfig=46=config ARM_GIC_V3_ITS\n--\ndrivers/irqchip/Kconfig-53-\ndrivers/irqchip/Kconfig:54:config ARM_GIC_V5\ndrivers/irqchip/Kconfig-55-\tbool\n"
}

gemini-3.1-pro-preview

null

null

							input: 20700
							output: 33
							thoughts: 15
						

Okay, here's my attempt at summarizing that thought process, keeping in mind I'm speaking to a fellow expert:

**Investigating GIC_V5 Configuration Options**

Alright, so the initial thought that pops into my head is: *hmm, let's just make sure we've exhausted all potential GIC_V5 configurations.* We're dealing with something relatively complex and nuanced here, and I always like to be thorough. I don't want to assume we've only scratched the surface, when there might be another setting, another register bit, or some other aspect of the GIC_V5 configuration we haven't considered. It’s always best to eliminate all potential avenues for a solution and ensure we have an exhaustive understanding of the system.

{
  "Expression": "GIC_V5",
  "PathPrefix": "drivers/irqchip/Kconfig"
}

{
  "Output": "drivers/irqchip/Kconfig=46=config ARM_GIC_V3_ITS\n--\ndrivers/irqchip/Kconfig-53-\ndrivers/irqchip/Kconfig:54:config ARM_GIC_V5\ndrivers/irqchip/Kconfig-55-\tbool\n"
}

gemini-3.1-pro-preview

null

null

							input: 20996
							output: 27
							thoughts: 42
						

Okay, here's my thought process on that:

**Investigating the `ARM_GIC_V5` Kernel Configuration Option**

Right, so I need to figure out the dependencies or the selection criteria for `ARM_GIC_V5` in the kernel. My best starting point is always the Kconfig files. Considering it's related to ARM and interrupt controllers, I'll begin by searching the architecture-specific `Kconfig` files – specifically `arch/arm64/Kconfig` – and also the interrupt controller driver files, so `drivers/irqchip/Kconfig` makes sense to check too. These are the usual suspects. I'll need to see what other features, hardware, or kernel configurations cause this option to be enabled. I'm essentially looking for the "select" statements or the dependencies defined using `depends on`, or maybe even see who *defaults* to having the option. That will give me a good handle on how this thing is used and configured.

{
  "Expression": "ARM_GIC_V5",
  "PathPrefix": ""
}

{
  "Output": "arch/arm64/Kconfig=2=config ARM64\n--\narch/arm64/Kconfig-106-\tselect ARM_GIC_V3_ITS if PCI\narch/arm64/Kconfig:107:\tselect ARM_GIC_V5\narch/arm64/Kconfig-108-\tselect ARM_PSCI_FW\n--\ndrivers/irqchip/Kconfig=46=config ARM_GIC_V3_ITS\n--\ndrivers/irqchip/Kconfig-53-\ndrivers/irqchip/Kconfig:54:config ARM_GIC_V5\ndrivers/irqchip/Kconfig-55-\tbool\n--\ndrivers/irqchip/Makefile=37=obj-$(CONFIG_ARM_GIC_V3_ITS)\t\t+= irq-gic-v3-its.o irq-gic-v4.o\ndrivers/irqchip/Makefile:38:obj-$(CONFIG_ARM_GIC_V5)\t\t+= irq-gic-v5.o irq-gic-v5-irs.o irq-gic-v5-its.o \\\ndrivers/irqchip/Makefile-39-\t\t\t\t\t   irq-gic-v5-iwb.o\n--\ninclude/linux/irqchip/arm-gic-v5.h-4- */\ninclude/linux/irqchip/arm-gic-v5.h:5:#ifndef __LINUX_IRQCHIP_ARM_GIC_V5_H\ninclude/linux/irqchip/arm-gic-v5.h:6:#define __LINUX_IRQCHIP_ARM_GIC_V5_H\ninclude/linux/irqchip/arm-gic-v5.h-7-\n"
}

gemini-3.1-pro-preview

null

null

							input: 21709
							output: 39
							thoughts: 95
						

**Analyzing ARM64 and KVM Interrupt Controller Configuration**

Okay, so looking at the configuration, it seems pretty straightforward. The system is set up in a way that the `ARM_GIC_V5` interrupt controller is automatically selected whenever `ARM64` architecture is enabled. Makes sense, given the prevalence of that architecture. But, now I need to dive a little deeper, especially with the `KVM` component in play. I know `KVM` is controlled by `CONFIG_KVM`, which is the starting point. I'm going to take a look at `arch/arm64/kvm/vgic/vgic.c` specifically, and I'll focus on the functions `vgic_get_irq` and `vgic_get_vcpu_irq`. I'm going to look at how these functions handle interrupt retrieval within the `KVM` environment on `ARM64`. I need to understand how the virtualization layer interacts with the GIC, and that's likely where these functions come into play.

{
  "Expression": "vgic_get_irq",
  "PathPrefix": "arch/arm64/kvm/vgic/"
}

{
  "Output": "arch/arm64/kvm/vgic/vgic-debug.c=234=static int vgic_debug_show(struct seq_file *s, void *v)\n--\narch/arm64/kvm/vgic/vgic-debug.c-255-\telse\narch/arm64/kvm/vgic/vgic-debug.c:256:\t\tirq = vgic_get_irq(kvm, iter-\u003eintid);\narch/arm64/kvm/vgic/vgic-debug.c-257-\n--\narch/arm64/kvm/vgic/vgic-its.c=76=static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,\n--\narch/arm64/kvm/vgic/vgic-its.c-79-\tstruct vgic_dist *dist = \u0026kvm-\u003earch.vgic;\narch/arm64/kvm/vgic/vgic-its.c:80:\tstruct vgic_irq *irq = vgic_get_irq(kvm, intid), *oldirq;\narch/arm64/kvm/vgic/vgic-its.c-81-\tunsigned long flags;\n--\narch/arm64/kvm/vgic/vgic-its.c=398=static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic-its.c-427-\narch/arm64/kvm/vgic/vgic-its.c:428:\t\tirq = vgic_get_irq(vcpu-\u003ekvm, intid);\narch/arm64/kvm/vgic/vgic-its.c-429-\t\tif (!irq)\n--\narch/arm64/kvm/vgic/vgic-its.c=567=static void vgic_its_cache_translation(struct kvm *kvm, struct vgic_its *its,\n--\narch/arm64/kvm/vgic/vgic-its.c-582-\tlockdep_assert_held(\u0026its-\u003eits_lock);\narch/arm64/kvm/vgic/vgic-its.c:583:\tvgic_get_irq_ref(irq);\narch/arm64/kvm/vgic/vgic-its.c-584-\n--\narch/arm64/kvm/vgic/vgic-its.c=1308=int vgic_its_invall(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic-its.c-1315-\txa_for_each(\u0026dist-\u003elpi_xa, intid, irq) {\narch/arm64/kvm/vgic/vgic-its.c:1316:\t\tirq = vgic_get_irq(kvm, intid);\narch/arm64/kvm/vgic/vgic-its.c-1317-\t\tif (!irq)\n--\narch/arm64/kvm/vgic/vgic-its.c=1363=static int vgic_its_cmd_handle_movall(struct kvm *kvm, struct vgic_its *its,\n--\narch/arm64/kvm/vgic/vgic-its.c-1381-\txa_for_each(\u0026dist-\u003elpi_xa, intid, irq) {\narch/arm64/kvm/vgic/vgic-its.c:1382:\t\tirq = vgic_get_irq(kvm, intid);\narch/arm64/kvm/vgic/vgic-its.c-1383-\t\tif (!irq)\n--\narch/arm64/kvm/vgic/vgic-mmio-v2.c=180=static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic-mmio-v2.c-193-\tfor (i = 0; i \u003c len; i++) {\narch/arm64/kvm/vgic/vgic-mmio-v2.c:194:\t\tstruct vgic_irq *irq = vgic_get_irq(vcpu-\u003ekvm, intid + i);\narch/arm64/kvm/vgic/vgic-mmio-v2.c-195-\t\tint target;\n--\narch/arm64/kvm/vgic/vgic-mmio-v3.c=220=static unsigned long vgic_mmio_read_irouter(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic-mmio-v3.c-223-\tint intid = VGIC_ADDR_TO_INTID(addr, 64);\narch/arm64/kvm/vgic/vgic-mmio-v3.c:224:\tstruct vgic_irq *irq = vgic_get_irq(vcpu-\u003ekvm, intid);\narch/arm64/kvm/vgic/vgic-mmio-v3.c-225-\tunsigned long ret = 0;\n--\narch/arm64/kvm/vgic/vgic-mmio-v3.c=238=static void vgic_mmio_write_irouter(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic-mmio-v3.c-249-\narch/arm64/kvm/vgic/vgic-mmio-v3.c:250:\tirq = vgic_get_irq(vcpu-\u003ekvm, intid);\narch/arm64/kvm/vgic/vgic-mmio-v3.c-251-\n--\narch/arm64/kvm/vgic/vgic-mmio-v3.c=555=static void vgic_mmio_write_invlpi(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic-mmio-v3.c-577-\narch/arm64/kvm/vgic/vgic-mmio-v3.c:578:\tirq = vgic_get_irq(vcpu-\u003ekvm, intid);\narch/arm64/kvm/vgic/vgic-mmio-v3.c-579-\tif (irq) {\n--\narch/arm64/kvm/vgic/vgic-mmio.c=733=void vgic_mmio_write_config(struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic-mmio.c-752-\narch/arm64/kvm/vgic/vgic-mmio.c:753:\t\tirq = vgic_get_irq(vcpu-\u003ekvm, intid + i);\narch/arm64/kvm/vgic/vgic-mmio.c-754-\t\traw_spin_lock_irqsave(\u0026irq-\u003eirq_lock, flags);\n--\narch/arm64/kvm/vgic/vgic.c=66=static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)\n--\narch/arm64/kvm/vgic/vgic.c-86- */\narch/arm64/kvm/vgic/vgic.c:87:struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid)\narch/arm64/kvm/vgic/vgic.c-88-{\n--\narch/arm64/kvm/vgic/vgic.c=108=struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)\n--\narch/arm64/kvm/vgic/vgic.c-131-\narch/arm64/kvm/vgic/vgic.c:132:\treturn vgic_get_irq(vcpu-\u003ekvm, intid);\narch/arm64/kvm/vgic/vgic.c-133-}\n--\narch/arm64/kvm/vgic/vgic.c=416=bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,\n--\narch/arm64/kvm/vgic/vgic.c-493-\t */\narch/arm64/kvm/vgic/vgic.c:494:\tvgic_get_irq_ref(irq);\narch/arm64/kvm/vgic/vgic.c-495-\tlist_add_tail(\u0026irq-\u003eap_list, \u0026vcpu-\u003earch.vgic_cpu.ap_list_head);\n--\narch/arm64/kvm/vgic/vgic.c=533=int kvm_vgic_inject_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic.c-549-\telse\narch/arm64/kvm/vgic/vgic.c:550:\t\tirq = vgic_get_irq(kvm, intid);\narch/arm64/kvm/vgic/vgic.c-551-\tif (!irq)\n--\narch/arm64/kvm/vgic/vgic.c=750=static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic.c-781-\t\t\t * This vgic_put_irq call matches the\narch/arm64/kvm/vgic/vgic.c:782:\t\t\t * vgic_get_irq_ref in vgic_queue_irq_unlock,\narch/arm64/kvm/vgic/vgic.c-783-\t\t\t * where we added the LPI to the ap_list. As\n--\narch/arm64/kvm/vgic/vgic.c-800-\t\t */\narch/arm64/kvm/vgic/vgic.c:801:\t\tvgic_get_irq_ref(irq);\narch/arm64/kvm/vgic/vgic.c-802-\n--\narch/arm64/kvm/vgic/vgic.h=260=vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,\narch/arm64/kvm/vgic/vgic.h-261-\t\t     gpa_t addr, int len);\narch/arm64/kvm/vgic/vgic.h:262:struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid);\narch/arm64/kvm/vgic/vgic.h-263-struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid);\n--\narch/arm64/kvm/vgic/vgic.h=304=static inline bool vgic_try_get_irq_ref(struct vgic_irq *irq)\n--\narch/arm64/kvm/vgic/vgic.h-314-\narch/arm64/kvm/vgic/vgic.h:315:static inline void vgic_get_irq_ref(struct vgic_irq *irq)\narch/arm64/kvm/vgic/vgic.h-316-{\n"
}

gemini-3.1-pro-preview

null

null

							input: 25117
							output: 43
							thoughts: 908
						

**Analyzing KVM VGIC Code for Potential Vulnerabilities**

Okay, so I'm looking at this patch and immediately, my spider senses are tingling. `vgic_get_irq` is a heavily used function in KVM's VGIC code, a critical component, and this patch modifies its behavior. That's a red flag, right there.

The change itself appears to address a potential out-of-bounds access. The original code used `array_index_nospec` to clamp `intid`. My initial thought was that subtracting `VGIC_NR_PRIVATE_IRQS` *after* the clamp could lead to problems, but then I realized, wait, `array_index_nospec` clamps *to* the upper bound. So, if `intid` was clamped to the upper limit, subtracting `VGIC_NR_PRIVATE_IRQS` would still be a valid index. But then it hit me: if `intid` *was* out of bounds, `array_index_nospec` would return 0. Subtracting `VGIC_NR_PRIVATE_IRQS` from zero... that's a recipe for a massive negative (or possibly huge positive, if it's unsigned) index, an absolutely classic out-of-bounds read! This is a critical security fix; it's practically screaming for some serious fuzzing.

I moved on to `vgic_get_vcpu_irq`, and here I see a similar pattern, specifically a bounds check added for GICv5. Good catch.

Now, let's identify the key focus symbols. `vgic_get_irq` and `vgic_get_vcpu_irq` seem like prime candidates. However, given their widespread use, I need to zoom in on where they're being *called* from. I'm thinking I/O control calls are high-value targets, so I checked those: `vgic_mmio_write_target`, `vgic_mmio_write_irouter`, `vgic_mmio_write_invlpi`, and `vgic_mmio_write_config`, and also `kvm_vgic_inject_irq` which is called from `kvm_vm_ioctl_irq_line`. Given that `vgic_get_irq` and `vgic_get_vcpu_irq` aren't static, they're the primary focus, here. `kvm_vgic_hyp_init` is called during initialization, not as interesting for fuzzing, and `gicv5_cpu_disable_interrupts` and `gicv5_irs_clear_affinity` are static, so that narrows the focus on `vgic_get_irq` and `vgic_get_vcpu_irq`. I'll zero in on them for fuzzing.

{
  "Expression": "vgic_get_irq",
  "PathPrefix": "arch/arm64/kvm/vgic/vgic.c"
}

{
  "Output": "arch/arm64/kvm/vgic/vgic.c=66=static struct vgic_irq *vgic_get_lpi(struct kvm *kvm, u32 intid)\n--\narch/arm64/kvm/vgic/vgic.c-86- */\narch/arm64/kvm/vgic/vgic.c:87:struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid)\narch/arm64/kvm/vgic/vgic.c-88-{\n--\narch/arm64/kvm/vgic/vgic.c=108=struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)\n--\narch/arm64/kvm/vgic/vgic.c-131-\narch/arm64/kvm/vgic/vgic.c:132:\treturn vgic_get_irq(vcpu-\u003ekvm, intid);\narch/arm64/kvm/vgic/vgic.c-133-}\n--\narch/arm64/kvm/vgic/vgic.c=416=bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,\n--\narch/arm64/kvm/vgic/vgic.c-493-\t */\narch/arm64/kvm/vgic/vgic.c:494:\tvgic_get_irq_ref(irq);\narch/arm64/kvm/vgic/vgic.c-495-\tlist_add_tail(\u0026irq-\u003eap_list, \u0026vcpu-\u003earch.vgic_cpu.ap_list_head);\n--\narch/arm64/kvm/vgic/vgic.c=533=int kvm_vgic_inject_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,\n--\narch/arm64/kvm/vgic/vgic.c-549-\telse\narch/arm64/kvm/vgic/vgic.c:550:\t\tirq = vgic_get_irq(kvm, intid);\narch/arm64/kvm/vgic/vgic.c-551-\tif (!irq)\n--\narch/arm64/kvm/vgic/vgic.c=750=static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic.c-781-\t\t\t * This vgic_put_irq call matches the\narch/arm64/kvm/vgic/vgic.c:782:\t\t\t * vgic_get_irq_ref in vgic_queue_irq_unlock,\narch/arm64/kvm/vgic/vgic.c-783-\t\t\t * where we added the LPI to the ap_list. As\n--\narch/arm64/kvm/vgic/vgic.c-800-\t\t */\narch/arm64/kvm/vgic/vgic.c:801:\t\tvgic_get_irq_ref(irq);\narch/arm64/kvm/vgic/vgic.c-802-\n"
}

gemini-3.1-pro-preview

null

null

							input: 27551
							output: 43
							thoughts: 42
						

Okay, here's my take on those thoughts, framed as my own:

**Investigating the Export Status of `vgic_get_irq` and `vgic_get_vcpu_irq`**

Right, let's see. My initial hunch is that `vgic_get_irq` and `vgic_get_vcpu_irq` are likely exported, or at the very least, they're not declared as `static`. Given their names and potential functionality within the Vgic subsystem, it makes sense they'd be available outside their immediate compilation unit. I've encountered similar patterns before, so this isn't a shot in the dark.

To confirm this, I need to verify their export status explicitly. I'll need to check the relevant header files, and possibly examine the build system configuration to be absolutely sure. A quick scan of the source should be enough to confirm if I'm right. Exported symbols will be in the system map. No need to get ahead of myself, but it's important to know the level of visibility for these functions. Their non-static nature has potential implications in a multi-threaded or virtualized environment.

no matches

{
  "Expression": "EXPORT_SYMBOL.*vgic_get_irq",
  "PathPrefix": "arch/arm64/kvm/vgic/"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

null

null

							input: 27902
							output: 39
							thoughts: 40
						

Okay, here's my interpretation of those thoughts, framed as my own:

**Analyzing KVM VGIC Code: Non-Static Thoughts**

Right, so these aren't module-exported functions, that's clear. But the key thing here is that they *are* non-static and employed across the KVM VGIC code. This immediately makes me think about scope and how these functions interact with different parts of the virtual GIC implementation. Now, where are these functions used, and what is the key function to trace their use? Let's trace it back to `kvm_vgic_inject_irq`. From there, I need to understand exactly what that function does with them. I'll need to go through the use cases to completely understand the purpose of the variables used throughout the code.

{
  "Expression": "kvm_vgic_inject_irq",
  "PathPrefix": "arch/arm64/kvm/"
}

{
  "Output": "arch/arm64/kvm/arch_timer.c=457=static void kvm_timer_update_irq(struct kvm_vcpu *vcpu, bool new_level,\n--\narch/arm64/kvm/arch_timer.c-478-\narch/arm64/kvm/arch_timer.c:479:\tkvm_vgic_inject_irq(vcpu-\u003ekvm, vcpu,\narch/arm64/kvm/arch_timer.c-480-\t\t\t    timer_irq(timer_ctx),\n--\narch/arm64/kvm/arm.c=1487=int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,\n--\narch/arm64/kvm/arm.c-1547-\narch/arm64/kvm/arm.c:1548:\t\treturn kvm_vgic_inject_irq(kvm, vcpu, irq_num, level, NULL);\narch/arm64/kvm/arm.c-1549-\tcase KVM_ARM_IRQ_TYPE_SPI:\n--\narch/arm64/kvm/arm.c-1565-\narch/arm64/kvm/arm.c:1566:\t\treturn kvm_vgic_inject_irq(kvm, NULL, irq_num, level, NULL);\narch/arm64/kvm/arm.c-1567-\t}\n--\narch/arm64/kvm/pmu-emul.c=396=static void kvm_pmu_update_state(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/pmu-emul.c-402-\narch/arm64/kvm/pmu-emul.c:403:\tWARN_ON(kvm_vgic_inject_irq(vcpu-\u003ekvm, vcpu, pmu-\u003eirq_num,\narch/arm64/kvm/pmu-emul.c-404-\t\t\t\t    kvm_pmu_overflow_status(vcpu), pmu));\n--\narch/arm64/kvm/vgic/vgic-irqfd.c=18=static int vgic_irqfd_set_irq(struct kvm_kernel_irq_routing_entry *e,\n--\narch/arm64/kvm/vgic/vgic-irqfd.c-31-\narch/arm64/kvm/vgic/vgic-irqfd.c:32:\treturn kvm_vgic_inject_irq(kvm, NULL, spi_id, level, NULL);\narch/arm64/kvm/vgic/vgic-irqfd.c-33-}\n--\narch/arm64/kvm/vgic/vgic-v3-nested.c=389=void vgic_v3_handle_nested_maint_irq(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic-v3-nested.c-393-\t/* This will force a switch back to L1 if the level is high */\narch/arm64/kvm/vgic/vgic-v3-nested.c:394:\tkvm_vgic_inject_irq(vcpu-\u003ekvm, vcpu,\narch/arm64/kvm/vgic/vgic-v3-nested.c-395-\t\t\t    vcpu-\u003ekvm-\u003earch.vgic.mi_intid, state, vcpu);\n--\narch/arm64/kvm/vgic/vgic-v3-nested.c=400=void vgic_v3_nested_update_mi(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic-v3-nested.c-404-\tlevel = (__vcpu_sys_reg(vcpu, ICH_HCR_EL2) \u0026 ICH_HCR_EL2_En) \u0026\u0026 vgic_v3_get_misr(vcpu);\narch/arm64/kvm/vgic/vgic-v3-nested.c:405:\tkvm_vgic_inject_irq(vcpu-\u003ekvm, vcpu,\narch/arm64/kvm/vgic/vgic-v3-nested.c-406-\t\t\t    vcpu-\u003ekvm-\u003earch.vgic.mi_intid, level, vcpu);\n--\narch/arm64/kvm/vgic/vgic.c=416=bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,\n--\narch/arm64/kvm/vgic/vgic.c-516-/**\narch/arm64/kvm/vgic/vgic.c:517: * kvm_vgic_inject_irq - Inject an IRQ from a device to the vgic\narch/arm64/kvm/vgic/vgic.c-518- * @kvm:     The VM structure pointer\n--\narch/arm64/kvm/vgic/vgic.c-532- */\narch/arm64/kvm/vgic/vgic.c:533:int kvm_vgic_inject_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,\narch/arm64/kvm/vgic/vgic.c-534-\t\t\tunsigned int intid, bool level, void *owner)\n"
}

gemini-3.1-pro-preview

null

null

							input: 29562
							output: 43
							thoughts: 100
						

**Focusing on the Virtual GIC**

Okay, so I'm honing in on the KVM Virtual GIC implementation. `kvm_vgic_inject_irq` is a particularly interesting symbol to explore. I'm also finding that `vgic_get_irq` and `vgic_get_vcpu_irq` are very relevant. My main question now is: What about GICv5? Does KVM have support for the more recent GICv5 architecture? I need to verify that. My instinct is telling me to look for `KVM_DEV_TYPE_ARM_VGIC_V5`, since that would make sense, so I'll dive into `arch/arm64/kvm/vgic/vgic.c` to confirm.

{
  "Expression": "KVM_DEV_TYPE_ARM_VGIC_V5",
  "PathPrefix": "arch/arm64/kvm/"
}

{
  "Output": "arch/arm64/kvm/vgic/vgic-init.c=71=int kvm_vgic_create(struct kvm *kvm, u32 type)\n--\narch/arm64/kvm/vgic/vgic-init.c-135-\t\tkvm-\u003emax_vcpus = VGIC_V3_MAX_CPUS;\narch/arm64/kvm/vgic/vgic-init.c:136:\telse if (type == KVM_DEV_TYPE_ARM_VGIC_V5)\narch/arm64/kvm/vgic/vgic-init.c-137-\t\tkvm-\u003emax_vcpus = min(VGIC_V5_MAX_CPUS,\n--\narch/arm64/kvm/vgic/vgic-init.c-190-\t */\narch/arm64/kvm/vgic/vgic-init.c:191:\tif (type == KVM_DEV_TYPE_ARM_VGIC_V5)\narch/arm64/kvm/vgic/vgic-init.c-192-\t\tkvm_timer_init_vm(kvm);\n--\narch/arm64/kvm/vgic/vgic-init.c=408=static void kvm_vgic_vcpu_reset(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic-init.c-411-\narch/arm64/kvm/vgic/vgic-init.c:412:\tif (dist-\u003evgic_model == KVM_DEV_TYPE_ARM_VGIC_V5)\narch/arm64/kvm/vgic/vgic-init.c-413-\t\tvgic_v5_reset(vcpu);\n--\narch/arm64/kvm/vgic/vgic-init.c=680=void kvm_vgic_finalize_idregs(struct kvm *kvm)\n--\narch/arm64/kvm/vgic/vgic-init.c-696-\t\tbreak;\narch/arm64/kvm/vgic/vgic-init.c:697:\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic-init.c-698-\t\taa64pfr2 |= SYS_FIELD_PREP_ENUM(ID_AA64PFR2_EL1, GCIE, IMP);\n--\narch/arm64/kvm/vgic/vgic-kvm-device.c=322=int kvm_register_vgic_device(unsigned long type)\n--\narch/arm64/kvm/vgic/vgic-kvm-device.c-338-\t\tbreak;\narch/arm64/kvm/vgic/vgic-kvm-device.c:339:\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic-kvm-device.c-340-\t\tret = kvm_register_device_ops(\u0026kvm_arm_vgic_v5_ops,\narch/arm64/kvm/vgic/vgic-kvm-device.c:341:\t\t\t\t\t      KVM_DEV_TYPE_ARM_VGIC_V5);\narch/arm64/kvm/vgic/vgic-kvm-device.c-342-\t\tbreak;\n--\narch/arm64/kvm/vgic/vgic-mmio.c=843=void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)\n--\narch/arm64/kvm/vgic/vgic-mmio.c-847-\tswitch (dist-\u003evgic_model) {\narch/arm64/kvm/vgic/vgic-mmio.c:848:\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic-mmio.c-849-\t\tvgic_v5_set_vmcr(vcpu, vmcr);\n--\narch/arm64/kvm/vgic/vgic-mmio.c=865=void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)\n--\narch/arm64/kvm/vgic/vgic-mmio.c-869-\tswitch (dist-\u003evgic_model) {\narch/arm64/kvm/vgic/vgic-mmio.c:870:\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic-mmio.c-871-\t\tvgic_v5_get_vmcr(vcpu, vmcr);\n--\narch/arm64/kvm/vgic/vgic-v5.c=40=int vgic_v5_probe(const struct gic_kvm_info *info)\n--\narch/arm64/kvm/vgic/vgic-v5.c-67-\narch/arm64/kvm/vgic/vgic-v5.c:68:\tret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V5);\narch/arm64/kvm/vgic/vgic-v5.c-69-\tif (ret) {\n--\narch/arm64/kvm/vgic/vgic.c=108=struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)\n--\narch/arm64/kvm/vgic/vgic.c-118-\t\tswitch (type) {\narch/arm64/kvm/vgic/vgic.c:119:\t\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic.c-120-\t\t\tintid = vgic_v5_get_hwirq_id(intid);\n--\narch/arm64/kvm/vgic/vgic.c=1175=void kvm_vgic_load(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic.c-1185-\tswitch (dist-\u003evgic_model) {\narch/arm64/kvm/vgic/vgic.c:1186:\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic.c-1187-\t\tvgic_v5_load(vcpu);\n--\narch/arm64/kvm/vgic/vgic.c=1203=void kvm_vgic_put(struct kvm_vcpu *vcpu)\n--\narch/arm64/kvm/vgic/vgic.c-1213-\tswitch (dist-\u003evgic_model) {\narch/arm64/kvm/vgic/vgic.c:1214:\tcase KVM_DEV_TYPE_ARM_VGIC_V5:\narch/arm64/kvm/vgic/vgic.c-1215-\t\tvgic_v5_put(vcpu);\n"
}

gemini-3.1-pro-preview

null

null

							input: 31752
							output: 36
							thoughts: 225
						

**KVM GICv5 Support: A Quick Review**

Okay, so GICv5 *is* supported within KVM. My mental checklist tells me the core modifications are centered in the KVM VGIC and the GICv5 drivers. Specifically, I see changes within the `gicv5_cpu_disable_interrupts` function, where an `isb()` instruction has been added, and the `gicv5_irs_clear_affinity` function, which appears to address either a memory leak or some kind of state cleanup issue. Within KVM VGIC, there are important fixes addressing the out-of-bounds array access bugs in `vgic_get_irq` and `vgic_get_vcpu_irq`, as well as a memory leak identified in `kvm_vgic_hyp_init`.

These seem like substantial functional changes, definitely warranting some serious fuzzing. Looking at the required configurations, I need to make sure `CONFIG_KVM` and `CONFIG_ARM_GIC_V5` are enabled. Ah, right, `ARM_GIC_V5` is actually selected by `ARM64`. So on ARM64, that's already taken care of. But `KVM` is the critical component here; that's the one I need to be sure is enabled. I should probably do a quick audit to see if any other configurations might be relevant here.

{
  "Expression": "config ARM_GIC_V5",
  "PathPrefix": "drivers/irqchip/Kconfig"
}

{
  "Output": "drivers/irqchip/Kconfig=46=config ARM_GIC_V3_ITS\n--\ndrivers/irqchip/Kconfig-53-\ndrivers/irqchip/Kconfig:54:config ARM_GIC_V5\ndrivers/irqchip/Kconfig-55-\tbool\n"
}

gemini-3.1-pro-preview

null

null

							input: 32404
							output: 41
							thoughts: 716
						

**KVM Configuration Analysis for ARM64 with GICv5**

Okay, so I'm diving into the KVM configuration for ARM64, specifically regarding the GICv5 implementation. I see that `ARM_GIC_V5` is basically a boolean, not something the user directly selects. It's essentially enabled by the `ARM64` config. So, that means `KVM` is the primary, pivotal config here.

Now, let's nail down the key symbols for analysis. I'm focusing on the functions that provide the core KVM/GICv5 interaction points. I've got my initial list: `kvm_vgic_inject_irq`, `vgic_get_irq`, and `vgic_get_vcpu_irq`. Wait, aren't those two, `vgic_get_irq` and `vgic_get_vcpu_irq`, not exported symbols? But they're not static, so that's interesting. I should check their definition; they're in `arch/arm64/kvm/vgic/vgic.c`. Confirmed. Okay, let's see if there are any other key functions. Ah, `kvm_vgic_hyp_init` is called once during initialization. And, `gicv5_cpu_disable_interrupts` is static, so I can ignore that one, and same for `gicv5_irs_clear_affinity`.

Let's circle back to the candidates. I'm thinking `vgic_get_irq` seems like a good focus point, it's called from a lot of places. `kvm_vgic_inject_irq` is also strong. Yeah, that's the core. So I'll definitely go with `kvm_vgic_inject_irq`, `vgic_get_irq`, and `vgic_get_vcpu_irq`. Those are the core symbols.

Just to be sure, let's double-check the definitions. I'll confirm that `vgic_get_irq` is as I expect:

```c
struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid)
{
...
}
```

and `vgic_get_vcpu_irq`:

```c
struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)
{
...
}
```

Okay, perfect. Now, what about those static functions? Let's confirm again that `gicv5_irs_clear_affinity` is static; okay, I can ignore that. And, what about `gicv5_irs_remove`? Hmm, it's `void __init gicv5_irs_remove(void)`. Wait, `__init`? That means it's only for error paths during init, so it's not a core symbol for regular operation.

```c
void __init gicv5_irs_remove(void)
{
...
}
```

And finally, `gicv5_cpu_disable_interrupts`? That is also static, so nothing here.

So, yeah, I'm confident that `kvm_vgic_inject_irq`, `vgic_get_irq`, and `vgic_get_vcpu_irq` are the correct focus symbols.

Now, just to confirm, is `KVM` the only config I need? Yep, `KVM` is the primary one, all roads lead to `KVM` for the KVM on ARM64. Wait, is there a `KVM_ARM_VGIC_V5` config? Hmm...

no matches

{
  "Expression": "KVM_ARM_VGIC_V5",
  "PathPrefix": "arch/arm64/kvm/Kconfig"
}

{
  "error": "no matches"
}

gemini-3.1-pro-preview

null

null

							input: 34018
							output: 34
							thoughts: 25
						

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

**Kernel Configuration Query**

Right, that's a negative on whatever initial question I was considering. Let's dig deeper. The first place to check, naturally, is `Kconfig`. Specifically, for the ARM64 architecture, I need to look at `arch/arm64/kvm/Kconfig`. I'm going to have to find what dependencies are there, what configuration options are available, and get an idea of where this functionality is enabled or disabled at build time. It's the standard place to start debugging a kernel configuration issue, after a quick "no" to the initial thought.

{
  "Expression": "config KVM",
  "PathPrefix": "arch/arm64/kvm/Kconfig"
}

{
  "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"
}

gemini-3.1-pro-preview

null

null

							input: 34322
							output: 145
							thoughts: 146
						

**My Assessment of the KVM Configuration**

Okay, so I've got this KVM configuration in front of me. Let's break it down and see what we're dealing with. First off, `WorthFuzzing` is set to `true`. Good, we want to subject it to thorough testing. The `FocusSymbols` are listed as `vgic_get_irq`, `vgic_get_vcpu_irq`, and `kvm_vgic_inject_irq`. Those are all very relevant to interrupt handling within the KVM's virtual GIC (VGIC) implementation – classic potential targets. The `EnableConfigs` include `KVM`, which makes sense, as the problem space is limited to KVM functionalities.

My reasoning? The description mentions critical out-of-bounds array accesses within KVM's VGIC IRQ handling. Those are nasty vulnerabilities that we need to address immediately. Specifically, the identified functions (`vgic_get_irq`, `vgic_get_vcpu_irq`) are targets. A memory leak in VGIC initialization is also problematic, indicating a resource management flaw. Additionally, we're told about a missing memory barrier in the GICv5 driver. All these are functional changes affecting core virtualization and interrupt controller code. They all speak to deep-seated issues that are likely reachable and have the potential for exploitation. This configuration is clearly aimed at addressing some significant issues. I need to dive deeper into these specific functions.

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "vgic_get_irq",
    "vgic_get_vcpu_irq",
    "kvm_vgic_inject_irq"
  ],
  "Reasoning": "The patch fixes critical out-of-bounds array accesses in KVM VGIC IRQ handling (`vgic_get_irq`, `vgic_get_vcpu_irq`), a memory leak in VGIC initialization, and adds a missing memory barrier in the GICv5 driver. These are functional changes in reachable core virtualization and interrupt controller code.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "KVM"
  ],
  "FocusSymbols": [
    "vgic_get_irq",
    "vgic_get_vcpu_irq",
    "kvm_vgic_inject_irq"
  ],
  "Reasoning": "The patch fixes critical out-of-bounds array accesses in KVM VGIC IRQ handling (`vgic_get_irq`, `vgic_get_vcpu_irq`), a memory leak in VGIC initialization, and adds a missing memory barrier in the GICv5 driver. These are functional changes in reachable core virtualization and interrupt controller code.",
  "WorthFuzzing": true
}

{
  "WorthFuzzing": true
}

null

best-expensive

null

{
  "KMSANReasoning": "The patch addresses a memory leak in vgic-init.c, an out-of-bounds array access and incorrect index calculation in vgic.c, a use-after-free/dangling pointer issue in irq-gic-v5-irs.c by clearing per-cpu pointers before freeing, and adds a missing instruction synchronization barrier (isb) in irq-gic-v5.c. None of these changes involve uninitialized memory, uninitialized variables, or info-leaks to user space. The bugs fixed (OOB, UAF, memory leaks) are well within the scope of KASAN and KMEMLEAK. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false
}

You are an expert Linux kernel security engineer specializing in kernel memory
error detectors (KASAN and KMSAN). Your job is to review the provided patch series and
determine if the code changes justify spawning a dedicated KMSAN (KernelMemorySanitizer)
fuzzing session in addition to standard KASAN fuzzing.

CRITICAL DISTINCTION BETWEEN KASAN AND KMSAN:
- Standard KASAN kernel builds (upstream-apparmor-kasan.config) already enable
  a comprehensive suite of debugging tools and sanitizers, including KASAN
  (out-of-bounds accesses, use-after-free, double free, invalid free), LOCKDEP
  (locking bugs and deadlocks), UB-sanitizers, and memory corruption checks.
- KMSAN (KernelMemorySanitizer) detects reads of UNINITIALIZED memory (stack, heap,
  or page allocations) and kernel-to-user memory info-leaks.

Rule: THERE IS NO SENSE IN RUNNING A KMSAN SESSION IF A BUG CAN BE CAUGHT BY KASAN,
LOCKDEP, OR OTHER STANDARD BUG DETECTORS.
A dedicated KMSAN fuzzing session incurs significant resource costs. You must ONLY
set NeedsKMSAN=true if the code changes introduce or expose UNINITIALIZED MEMORY risks
that are detected ONLY by KMSAN.

Look holistically at the patch series and surrounding code. Even if no direct
uninitialized field accesses or new buffer allocations are added in the diff itself,
a patch may alter control flow, bounds checking, or data length calculations in ways
that change how the rest of the code operates on existing buffers (e.g. allowing
uninitialized stack/heap memory to be read, copied to user space, or used in control
flow). Do not hesitate to use your code access tools to inspect the surrounding code,
called functions, and callers.

Set NeedsKMSAN=true ONLY IF the patch introduces or modifies:
1. Kernel structures sent to user space (via copy_to_user, put_user, netlink skb
   attributes, ioctl output arguments, socket options, or BPF buffers) where fields
   or structure padding might not be fully initialized/zeroed.
2. Conditional logic or branching that depends on potentially uninitialized variables
   or struct fields.
3. Allocation or initialization of complex data structures where uninitialized fields
   could be read later in reachable code paths.
4. Bounds checks, lengths, or logic in a way that allows surrounding code to access
   uninitialized bytes of existing buffers.

Set NeedsKMSAN=false IF:
- The code changes primarily risk out-of-bounds access, array overflows, NULL pointer
  dereferences, locking deadlocks, or use-after-free bugs (these are already caught
  by KASAN, LOCKDEP, or standard bug detectors).
- All stack/heap structures touched or introduced by the patch are fully zeroed
  or initialized (e.g. using = {0}, memset, kzalloc) before being read or copied.
- The patch does not introduce any risk of uninitialized memory usage or info-leaks.

Use your code access tools to inspect the surrounding code if necessary, then provide
detailed KMSANReasoning contrasting KASAN vs KMSAN applicability for this patch.
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit 62cb5dccd5fc6a56f2281e00d93c3d67d6667136
Author: syz-cluster <triage@syzkaller.com>
Date:   Mon Aug 10 11:34:36 2026 +0000

    syz-cluster: applied patch under review

diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c
index 907057881b26a..65e203d6a2cf4 100644
--- a/arch/arm64/kvm/vgic/vgic-init.c
+++ b/arch/arm64/kvm/vgic/vgic-init.c
@@ -787,7 +787,8 @@ int kvm_vgic_hyp_init(void)
 
 	if (has_mask && !gic_kvm_info->maint_irq) {
 		kvm_err("No vgic maintenance irq\n");
-		return -ENXIO;
+		ret = -ENXIO;
+		goto out_free;
 	}
 
 	/*
@@ -820,6 +821,7 @@ int kvm_vgic_hyp_init(void)
 
 	kvm_vgic_global_state.maint_irq = gic_kvm_info->maint_irq;
 
+out_free:
 	kfree(gic_kvm_info);
 	gic_kvm_info = NULL;
 
diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c
index 74bace10a22ed..b25303d9919fd 100644
--- a/arch/arm64/kvm/vgic/vgic.c
+++ b/arch/arm64/kvm/vgic/vgic.c
@@ -93,8 +93,9 @@ struct vgic_irq *vgic_get_irq(struct kvm *kvm, u32 intid)
 	/* SPIs */
 	if (intid >= VGIC_NR_PRIVATE_IRQS &&
 	    intid < (kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS)) {
-		intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS);
-		return &kvm->arch.vgic.spis[intid - VGIC_NR_PRIVATE_IRQS];
+		intid -= VGIC_NR_PRIVATE_IRQS;
+		intid = array_index_nospec(intid, kvm->arch.vgic.nr_spis);
+		return &kvm->arch.vgic.spis[intid];
 	}
 
 	/* LPIs */
@@ -117,6 +118,8 @@ struct vgic_irq *vgic_get_vcpu_irq(struct kvm_vcpu *vcpu, u32 intid)
 		switch (type) {
 		case KVM_DEV_TYPE_ARM_VGIC_V5:
 			intid = vgic_v5_get_hwirq_id(intid);
+			if (intid >= VGIC_V5_NR_PRIVATE_IRQS)
+				return NULL;
 			intid = array_index_nospec(intid, VGIC_V5_NR_PRIVATE_IRQS);
 			break;
 		default:
diff --git a/drivers/irqchip/irq-gic-v5-irs.c b/drivers/irqchip/irq-gic-v5-irs.c
index f3fce0b1e25d9..67940ea9e39b7 100644
--- a/drivers/irqchip/irq-gic-v5-irs.c
+++ b/drivers/irqchip/irq-gic-v5-irs.c
@@ -651,6 +651,19 @@ static int __init gicv5_irs_of_init_affinity(struct device_node *node,
 	return ret;
 }
 
+static void __init gicv5_irs_clear_affinity(struct gicv5_irs_chip_data *irs_data)
+{
+	int cpu;
+
+	for_each_possible_cpu(cpu) {
+		if (per_cpu(per_cpu_irs_data, cpu) == irs_data) {
+			per_cpu(cpu_iaffid, cpu).iaffid = 0;
+			per_cpu(cpu_iaffid, cpu).valid = false;
+			per_cpu(per_cpu_irs_data, cpu) = NULL;
+		}
+	}
+}
+
 static void irs_setup_pri_bits(u32 idr1)
 {
 	switch (FIELD_GET(GICV5_IRS_IDR1_PRIORITY_BITS, idr1)) {
@@ -773,6 +786,7 @@ static int __init gicv5_irs_of_init(struct device_node *node)
 	return ret;
 
 out_iomem:
+	gicv5_irs_clear_affinity(irs_data);
 	iounmap(irs_base);
 out_err:
 	kfree(irs_data);
@@ -787,6 +801,7 @@ void __init gicv5_irs_remove(void)
 	gicv5_deinit_lpis();
 
 	list_for_each_entry_safe(irs_data, tmp_data, &irs_nodes, entry) {
+		gicv5_irs_clear_affinity(irs_data);
 		iounmap(irs_data->irs_base);
 		list_del(&irs_data->entry);
 		kfree(irs_data);
@@ -951,6 +966,7 @@ static int __init gic_acpi_parse_madt_irs(union acpi_subtable_headers *header,
 	return 0;
 
 out_map:
+	gicv5_irs_clear_affinity(irs_data);
 	iounmap(irs_base);
 out_release:
 	release_mem_region(r->start, resource_size(r));
diff --git a/drivers/irqchip/irq-gic-v5.c b/drivers/irqchip/irq-gic-v5.c
index e9d1795235a66..6a99c541b559b 100644
--- a/drivers/irqchip/irq-gic-v5.c
+++ b/drivers/irqchip/irq-gic-v5.c
@@ -983,6 +983,7 @@ static void gicv5_cpu_disable_interrupts(void)
 
 	cr0 = FIELD_PREP(ICC_CR0_EL1_EN, 0);
 	write_sysreg_s(cr0, SYS_ICC_CR0_EL1);
+	isb();
 }
 
 static void gicv5_cpu_enable_interrupts(void)

gemini-3.1-pro-preview

null

null

							input: 3555
							output: 175
							thoughts: 564
						

**Patch Analysis and KMSAN Assessment**

Okay, let me break this down. From a quick scan, it looks like this patch is all about tightening up some loose ends in the KVM and GICv5 interaction, mostly around memory safety and correct behavior.

First, in `arch/arm64/kvm/vgic/vgic-init.c`, the change is replacing a simple `return -ENXIO;` with a proper `goto out_free;` which includes a `kfree` of `gic_kvm_info`. This is a straightforward memory leak fix. Nothing complex or concerning from a KMSAN perspective, as it simply adds a necessary cleanup path.

Next, in `arch/arm64/kvm/vgic/vgic.c`, we're addressing array access issues in both `vgic_get_irq` and `vgic_get_vcpu_irq`. The use of `array_index_nospec` is being revised to ensure that the index `intid` stays within the valid bounds. This prevents potential out-of-bounds reads or writes, which is a good safety measure. There's also a direct bounds check now added.

Then, moving to `drivers/irqchip/irq-gic-v5-irs.c`, `gicv5_irs_clear_affinity` is introduced. This seems to be a crucial addition for clearing per-CPU state associated with `irs_data` *before* freeing the memory. This is a very clear UAF (use-after-free) and dangling pointer issue fix. Eliminating a race condition here will do wonders for stability.

Finally, in `drivers/irqchip/irq-gic-v5.c`, we're adding an `isb()` instruction after writing to a system register. This is all about ensuring the correct memory barrier for instruction synchronization. The kernel is taking a conservative approach here to prevent any potential missed updates or data corruption.

Looking at the overall picture, none of these changes introduce any new uninitialized memory vulnerabilities, info-leaks, or uninitialized variables. We're primarily fixing memory leaks, potential out-of-bounds accesses, use-after-free conditions, and missing memory barriers. All of these bugs would be caught by existing tools like KASAN or KMEMLEAK, or are just straight logic bugs. So, I see no reason to believe that KMSAN would add value here; in fact, there is nothing in this patch that would change the KMSAN status of anything. We don't need to enable it for this patch.

I will double check my analysis with a quick review.
-   `vgic_init.c`: The memory leak is fixed by adding `kfree(gic_kvm_info);` to the error path.
-   `vgic.c`: The change handles an out-of-bounds array access by correcting the index calculation in the code.
-   `irq-gic-v5-irs.c`: The UAF is avoided by adding `gicv5_irs_clear_affinity`.
-   `irq-gic-v5.c`: The instruction synchronization barrier is addressed by the use of `isb()`.

Yep, looks good. No uninitialized memory risks or KMSAN needs that I can identify here. This is a solid set of fixes that improves the robustness of the system.

{
  "KMSANReasoning": "The patch addresses a memory leak in vgic-init.c, an out-of-bounds array access and incorrect index calculation in vgic.c, a use-after-free/dangling pointer issue in irq-gic-v5-irs.c by clearing per-cpu pointers before freeing, and adds a missing instruction synchronization barrier (isb) in irq-gic-v5.c. None of these changes involve uninitialized memory, uninitialized variables, or info-leaks to user space. The bugs fixed (OOB, UAF, memory leaks) are well within the scope of KASAN and KMEMLEAK. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false
}

{
  "KMSANReasoning": "The patch addresses a memory leak in vgic-init.c, an out-of-bounds array access and incorrect index calculation in vgic.c, a use-after-free/dangling pointer issue in irq-gic-v5-irs.c by clearing per-cpu pointers before freeing, and adds a missing instruction synchronization barrier (isb) in irq-gic-v5.c. None of these changes involve uninitialized memory, uninitialized variables, or info-leaks to user space. The bugs fixed (OOB, UAF, memory leaks) are well within the scope of KASAN and KMEMLEAK. Therefore, a dedicated KMSAN fuzzing session is not required.",
  "NeedsKMSAN": false
}