From: Sasha Levin <sashal@kernel.org>
To: stable@vger.kernel.org
Cc: Sean Christopherson <seanjc@google.com>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Marc Zyngier <maz@kernel.org>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Anup Patel <anup@brainfault.org>, Bibo Mao <maobibo@loongson.cn>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 6.19.y 1/2] KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay
Date: Mon, 13 Apr 2026 08:51:48 -0400 [thread overview]
Message-ID: <20260413125149.2876836-1-sashal@kernel.org> (raw)
In-Reply-To: <2026041316-tribunal-pendant-dc80@gregkh>
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>
---
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(-)
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 1c87699fd886e..332c453b87cf8 100644
--- 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_stats_header = {
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),
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index f15d78c00dbd6..3a359d83b022a 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -14,7 +14,7 @@
#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),
diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c
index 194ccbcdc3b38..7deff56e0e1ab 100644
--- a/arch/loongarch/kvm/vm.c
+++ b/arch/loongarch/kvm/vm.c
@@ -10,7 +10,7 @@
#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),
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index b0fb92fda4d42..23e69baad453c 100644
--- 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_stats_header = {
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),
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index d79c5d1098c05..2efbe05caed76 100644
--- 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_stats_header = {
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),
diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 3401b96be475e..f3ddb24ece749 100644
--- 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_stats_header = {
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),
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index a55a95da54d0f..fdd99ac1e7148 100644
--- 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),
diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
index 66d91ae6e9b2a..715a06ae8c131 100644
--- 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) ==
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 56a50524b3eee..495141bf03989 100644
--- 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_stats_header = {
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),
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0d731ce4c4e16..ad2f0a5a84328 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -239,7 +239,7 @@ EXPORT_SYMBOL_FOR_KVM_INTERNAL(enable_ipiv);
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),
@@ -265,7 +265,7 @@ const struct kvm_stats_header kvm_vm_stats_header = {
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),
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index d93f75b05ae22..7428d9949382f 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1927,56 +1927,43 @@ 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)
@@ -2053,7 +2040,7 @@ 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);
@@ -2098,9 +2085,9 @@ static inline void kvm_stats_log_hist_update(u64 *data, size_t size, u64 value)
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)
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index dddb781b0507d..76bd54848b112 100644
--- 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
/*
@@ -1579,7 +1583,11 @@ 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)
diff --git a/virt/kvm/binary_stats.c b/virt/kvm/binary_stats.c
index eefca6c69f519..76ce697c773bf 100644
--- 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)
{
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 5b5b69c97665e..cf65fd82d36dd 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -983,9 +983,9 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
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:
@@ -1020,7 +1020,7 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, const char *fdname)
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;
@@ -6186,11 +6186,11 @@ static int kvm_stat_data_get(void *data, u64 *val)
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;
}
@@ -6208,11 +6208,11 @@ static int kvm_stat_data_clear(void *data, u64 val)
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;
}
@@ -6360,7 +6360,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
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);
@@ -6373,7 +6373,7 @@ 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) {
@@ -6384,7 +6384,7 @@ 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);
}
}
--
2.53.0
next prev parent reply other threads:[~2026-04-13 12:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-13 12:08 FAILED: patch "[PATCH] KVM: x86: Use __DECLARE_FLEX_ARRAY() for UAPI structures with" failed to apply to 6.19-stable tree gregkh
2026-04-13 12:51 ` Sasha Levin [this message]
2026-04-13 12:51 ` [PATCH 6.19.y 2/2] KVM: x86: Use __DECLARE_FLEX_ARRAY() for UAPI structures with VLAs Sasha Levin
2026-04-16 0:30 ` Sean Christopherson
2026-04-15 22:20 ` [PATCH 6.19.y 1/2] KVM: Remove subtle "struct kvm_stats_desc" pseudo-overlay Sean Christopherson
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