[PATCH 6.18 172/198] KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay

Greg Kroah-Hartman
2026-04-20T16:04:40Z

From: Sean Christopherson <seanjc@google.com>

[ Upstream commit da142f3d373a6ddaca0119615a8db2175ddc4121 ]

Remove KVM's internal pseudo-overlay of kvm_stats_desc, which subtly
aliases the flexible name[] in the uAPI definition with a fixed-size array
of the same name. The unusual embedded structure results in compiler
warnings due to -Wflex-array-member-not-at-end, and also necessitates an
extra level of dereferencing in KVM. To avoid the "overlay", define the
uAPI structure to have a fixed-size name when building for the kernel.

Opportunistically clean up the indentation for the stats macros, and
replace spaces with tabs.

No functional change intended.

Reported-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Closes: https://lore.kernel.org/all/aPfNKRpLfhmhYqfP@kspp
Acked-by: Marc Zyngier <maz@kernel.org>
Acked-by: Christian Borntraeger <borntraeger@linux.ibm.com>
[..]
Acked-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Acked-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://patch.msgid.link/20251205232655.445294-1-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Stable-dep-of: 2619da73bb2f ("KVM: x86: Use __DECLARE_FLEX_ARRAY() for UAPI structures with VLAs")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/arm64/kvm/guest.c | 4 +-
arch/loongarch/kvm/vcpu.c | 2 -
arch/loongarch/kvm/vm.c | 2 -
arch/mips/kvm/mips.c | 4 +-
arch/powerpc/kvm/book3s.c | 4 +-
arch/powerpc/kvm/booke.c | 4 +-
arch/riscv/kvm/vcpu.c | 2 -
arch/riscv/kvm/vm.c | 2 -
arch/s390/kvm/kvm-s390.c | 4 +-
arch/x86/kvm/x86.c | 4 +-
include/linux/kvm_host.h | 83 +++++++++++++++++++---------------------------
include/uapi/linux/kvm.h | 8 ++++
virt/kvm/binary_stats.c | 2 -
virt/kvm/kvm_main.c | 20 +++++------
14 files changed, 70 insertions(+), 75 deletions(-)

--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -29,7 +29,7 @@

#include "trace.h"

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS()
};

@@ -42,7 +42,7 @@ const struct kvm_stats_header kvm_vm_sta
sizeof(kvm_vm_stats_desc),
};

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, hvc_exit_stat),
STATS_DESC_COUNTER(VCPU, wfe_exit_stat),
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -13,7 +13,7 @@
#define CREATE_TRACE_POINTS
#include "trace.h"

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, int_exits),
STATS_DESC_COUNTER(VCPU, idle_exits),
--- a/arch/loongarch/kvm/vm.c
+++ b/arch/loongarch/kvm/vm.c
@@ -9,7 +9,7 @@
#include <asm/kvm_eiointc.h>
#include <asm/kvm_pch_pic.h>

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
STATS_DESC_ICOUNTER(VM, pages),
STATS_DESC_ICOUNTER(VM, hugepages),
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -38,7 +38,7 @@
#define VECTORSPACING 0x100 /* for EI/VI mode */
#endif

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS()
};

@@ -51,7 +51,7 @@ const struct kvm_stats_header kvm_vm_sta
sizeof(kvm_vm_stats_desc),
};

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, wait_exits),
STATS_DESC_COUNTER(VCPU, cache_exits),
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -38,7 +38,7 @@

/* #define EXIT_DEBUG */

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
STATS_DESC_ICOUNTER(VM, num_2M_pages),
STATS_DESC_ICOUNTER(VM, num_1G_pages)
@@ -53,7 +53,7 @@ const struct kvm_stats_header kvm_vm_sta
sizeof(kvm_vm_stats_desc),
};

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, sum_exits),
STATS_DESC_COUNTER(VCPU, mmio_exits),
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -36,7 +36,7 @@

unsigned long kvmppc_booke_handlers;

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
STATS_DESC_ICOUNTER(VM, num_2M_pages),
STATS_DESC_ICOUNTER(VM, num_1G_pages)
@@ -51,7 +51,7 @@ const struct kvm_stats_header kvm_vm_sta
sizeof(kvm_vm_stats_desc),
};

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, sum_exits),
STATS_DESC_COUNTER(VCPU, mmio_exits),
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -24,7 +24,7 @@
#define CREATE_TRACE_POINTS
#include "trace.h"

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, ecall_exit_stat),
STATS_DESC_COUNTER(VCPU, wfi_exit_stat),
--- a/arch/riscv/kvm/vm.c
+++ b/arch/riscv/kvm/vm.c
@@ -13,7 +13,7 @@
#include <linux/kvm_host.h>
#include <asm/kvm_mmu.h>

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS()
};
static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -64,7 +64,7 @@
#define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
(KVM_MAX_VCPUS + LOCAL_IRQS))

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
STATS_DESC_COUNTER(VM, inject_io),
STATS_DESC_COUNTER(VM, inject_float_mchk),
@@ -90,7 +90,7 @@ const struct kvm_stats_header kvm_vm_sta
sizeof(kvm_vm_stats_desc),
};

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, exit_userspace),
STATS_DESC_COUNTER(VCPU, exit_null),
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -242,7 +242,7 @@ EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_ip
bool __read_mostly enable_device_posted_irqs = true;
EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_device_posted_irqs);

-const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+const struct kvm_stats_desc kvm_vm_stats_desc[] = {
KVM_GENERIC_VM_STATS(),
STATS_DESC_COUNTER(VM, mmu_shadow_zapped),
STATS_DESC_COUNTER(VM, mmu_pte_write),
@@ -268,7 +268,7 @@ const struct kvm_stats_header kvm_vm_sta
sizeof(kvm_vm_stats_desc),
};

-const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
+const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, pf_taken),
STATS_DESC_COUNTER(VCPU, pf_fixed),
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1932,56 +1932,43 @@ enum kvm_stat_kind {

struct kvm_stat_data {
struct kvm *kvm;
- const struct _kvm_stats_desc *desc;
+ const struct kvm_stats_desc *desc;
enum kvm_stat_kind kind;
};

-struct _kvm_stats_desc {
- struct kvm_stats_desc desc;
- char name[KVM_STATS_NAME_SIZE];
-};
-
-#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz) \
- .flags = type | unit | base | \
- BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) | \
- BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) | \
- BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK), \
- .exponent = exp, \
- .size = sz, \
+#define STATS_DESC_COMMON(type, unit, base, exp, sz, bsz) \
+ .flags = type | unit | base | \
+ BUILD_BUG_ON_ZERO(type & ~KVM_STATS_TYPE_MASK) | \
+ BUILD_BUG_ON_ZERO(unit & ~KVM_STATS_UNIT_MASK) | \
+ BUILD_BUG_ON_ZERO(base & ~KVM_STATS_BASE_MASK), \
+ .exponent = exp, \
+ .size = sz, \
.bucket_size = bsz

-#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
- { \
- { \
- STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
- .offset = offsetof(struct kvm_vm_stat, generic.stat) \
- }, \
- .name = #stat, \
- }
-#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
- { \
- { \
- STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
- .offset = offsetof(struct kvm_vcpu_stat, generic.stat) \
- }, \
- .name = #stat, \
- }
-#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
- { \
- { \
- STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
- .offset = offsetof(struct kvm_vm_stat, stat) \
- }, \
- .name = #stat, \
- }
-#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
- { \
- { \
- STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
- .offset = offsetof(struct kvm_vcpu_stat, stat) \
- }, \
- .name = #stat, \
- }
+#define VM_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
+{ \
+ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
+ .offset = offsetof(struct kvm_vm_stat, generic.stat), \
+ .name = #stat, \
+}
+#define VCPU_GENERIC_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
+{ \
+ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
+ .offset = offsetof(struct kvm_vcpu_stat, generic.stat), \
+ .name = #stat, \
+}
+#define VM_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
+{ \
+ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
+ .offset = offsetof(struct kvm_vm_stat, stat), \
+ .name = #stat, \
+}
+#define VCPU_STATS_DESC(stat, type, unit, base, exp, sz, bsz) \
+{ \
+ STATS_DESC_COMMON(type, unit, base, exp, sz, bsz), \
+ .offset = offsetof(struct kvm_vcpu_stat, stat), \
+ .name = #stat, \
+}
/* SCOPE: VM, VM_GENERIC, VCPU, VCPU_GENERIC */
#define STATS_DESC(SCOPE, stat, type, unit, base, exp, sz, bsz) \
SCOPE##_STATS_DESC(stat, type, unit, base, exp, sz, bsz)
@@ -2058,7 +2045,7 @@ struct _kvm_stats_desc {
STATS_DESC_IBOOLEAN(VCPU_GENERIC, blocking)

ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
- const struct _kvm_stats_desc *desc,
+ const struct kvm_stats_desc *desc,
void *stats, size_t size_stats,
char __user *user_buffer, size_t size, loff_t *offset);

@@ -2103,9 +2090,9 @@ static inline void kvm_stats_log_hist_up

extern const struct kvm_stats_header kvm_vm_stats_header;
-extern const struct _kvm_stats_desc kvm_vm_stats_desc[];
+extern const struct kvm_stats_desc kvm_vm_stats_desc[];
extern const struct kvm_stats_header kvm_vcpu_stats_header;
-extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
+extern const struct kvm_stats_desc kvm_vcpu_stats_desc[];

#ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq)
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -14,6 +14,10 @@
#include <linux/ioctl.h>
#include <asm/kvm.h>

+#ifdef __KERNEL__
+#include <linux/kvm_types.h>
+#endif
+
#define KVM_API_VERSION 12

/*
@@ -1568,7 +1572,11 @@ struct kvm_stats_desc {
__u16 size;
__u32 offset;
__u32 bucket_size;
+#ifdef __KERNEL__
+ char name[KVM_STATS_NAME_SIZE];
+#else
char name[];
+#endif
};

#define KVM_GET_STATS_FD _IO(KVMIO, 0xce)
--- a/virt/kvm/binary_stats.c
+++ b/virt/kvm/binary_stats.c
@@ -50,7 +50,7 @@
* Return: the number of bytes that has been successfully read
*/
ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
- const struct _kvm_stats_desc *desc,
+ const struct kvm_stats_desc *desc,
void *stats, size_t size_stats,
char __user *user_buffer, size_t size, loff_t *offset)
{
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -982,9 +982,9 @@ static void kvm_free_memslots(struct kvm
kvm_free_memslot(kvm, memslot);
}

-static umode_t kvm_stats_debugfs_mode(const struct _kvm_stats_desc *pdesc)
+static umode_t kvm_stats_debugfs_mode(const struct kvm_stats_desc *desc)
{
- switch (pdesc->desc.flags & KVM_STATS_TYPE_MASK) {
+ switch (desc->flags & KVM_STATS_TYPE_MASK) {
case KVM_STATS_TYPE_INSTANT:
return 0444;
case KVM_STATS_TYPE_CUMULATIVE:
@@ -1019,7 +1019,7 @@ static int kvm_create_vm_debugfs(struct
struct dentry *dent;
char dir_name[ITOA_MAX_LEN * 2];
struct kvm_stat_data *stat_data;
- const struct _kvm_stats_desc *pdesc;
+ const struct kvm_stats_desc *pdesc;
int i, ret = -ENOMEM;
int kvm_debugfs_num_entries = kvm_vm_stats_header.num_desc +
kvm_vcpu_stats_header.num_desc;
@@ -6160,11 +6160,11 @@ static int kvm_stat_data_get(void *data,
switch (stat_data->kind) {
case KVM_STAT_VM:
r = kvm_get_stat_per_vm(stat_data->kvm,
- stat_data->desc->desc.offset, val);
+ stat_data->desc->offset, val);
break;
case KVM_STAT_VCPU:
r = kvm_get_stat_per_vcpu(stat_data->kvm,
- stat_data->desc->desc.offset, val);
+ stat_data->desc->offset, val);
break;
}

@@ -6182,11 +6182,11 @@ static int kvm_stat_data_clear(void *dat
switch (stat_data->kind) {
case KVM_STAT_VM:
r = kvm_clear_stat_per_vm(stat_data->kvm,
- stat_data->desc->desc.offset);
+ stat_data->desc->offset);
break;
case KVM_STAT_VCPU:
r = kvm_clear_stat_per_vcpu(stat_data->kvm,
- stat_data->desc->desc.offset);
+ stat_data->desc->offset);
break;
}

@@ -6334,7 +6334,7 @@ static void kvm_uevent_notify_change(uns
static void kvm_init_debug(void)
{
const struct file_operations *fops;
- const struct _kvm_stats_desc *pdesc;
+ const struct kvm_stats_desc *pdesc;
int i;

kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
@@ -6347,7 +6347,7 @@ static void kvm_init_debug(void)
fops = &vm_stat_readonly_fops;
debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc),
kvm_debugfs_dir,
- (void *)(long)pdesc->desc.offset, fops);
+ (void *)(long)pdesc->offset, fops);
}

for (i = 0; i < kvm_vcpu_stats_header.num_desc; ++i) {
@@ -6358,7 +6358,7 @@ static void kvm_init_debug(void)
fops = &vcpu_stat_readonly_fops;
debugfs_create_file(pdesc->name, kvm_stats_debugfs_mode(pdesc),
kvm_debugfs_dir,
- (void *)(long)pdesc->desc.offset, fops);
+ (void *)(long)pdesc->offset, fops);
}
}