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KVM generic changes for 7.0 

- Remove a subtle pseudo-overlay of kvm_stats_desc, which, aside from being
    unnecessary and confusing, triggered compiler warnings due to
    -Wflex-array-member-not-at-end.
 
  - Document that vcpu->mutex is take outside of kvm->slots_lock and
    kvm->slots_arch_lock, which is intentional and desirable despite being
    rather unintuitive.
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Merge tag 'kvm-x86-generic-7.0-rc3' of https://github.com/kvm-x86/linux into HEAD

KVM generic changes for 7.0

 - Remove a subtle pseudo-overlay of kvm_stats_desc, which, aside from being
   unnecessary and confusing, triggered compiler warnings due to
   -Wflex-array-member-not-at-end.

 - Document that vcpu->mutex is take outside of kvm->slots_lock and
   kvm->slots_arch_lock, which is intentional and desirable despite being
   rather unintuitive.
This commit is contained in:
Paolo Bonzini 2026-03-11 18:01:55 +01:00
parent 40c2ffcac0 f8211e95df
commit 94fe3e6515
15 changed files with 72 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/virt/kvm/locking.rst
View File

@ -17,6 +17,8 @@ The acquisition orders for mutexes are as follows:
- kvm->lock is taken outside kvm->slots_lock and kvm->irq_lock
- vcpu->mutex is taken outside kvm->slots_lock and kvm->slots_arch_lock
- kvm->slots_lock is taken outside kvm->irq_lock, though acquiring
them together is quite rare.

4
arch/arm64/kvm/guest.c
View File

@ -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),

2
arch/loongarch/kvm/vcpu.c
View File

@ -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),

2
arch/loongarch/kvm/vm.c
View File

@ -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),

4
arch/mips/kvm/mips.c
View File

@ -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),

4
arch/powerpc/kvm/book3s.c
View File

@ -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),

4
arch/powerpc/kvm/booke.c
View File

@ -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),

2
arch/riscv/kvm/vcpu.c
View File

@ -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),

2
arch/riscv/kvm/vm.c
View File

@ -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) ==

4
arch/s390/kvm/kvm-s390.c
View File

@ -65,7 +65,7 @@
#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),
@ -91,7 +91,7 @@ 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),

4
arch/x86/kvm/x86.c
View File

@ -243,7 +243,7 @@ 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),
@ -269,7 +269,7 @@ 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),

83
include/linux/kvm_host.h
View File

@ -1940,56 +1940,43 @@ 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)
@ -2066,7 +2053,7 @@ 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);
@ -2111,9 +2098,9 @@ 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[];
static inline int mmu_invalidate_retry(struct kvm *kvm, unsigned long mmu_seq)
{

8
include/uapi/linux/kvm.h
View File

@ -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
/*
@ -1601,7 +1605,11 @@ 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)

2
virt/kvm/binary_stats.c
View File

@ -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)
{

20
virt/kvm/kvm_main.c
View File

@ -973,9 +973,9 @@ 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:
@ -1010,7 +1010,7 @@ 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;
@ -6171,11 +6171,11 @@ 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;
}
@ -6193,11 +6193,11 @@ 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;
}
@ -6345,7 +6345,7 @@ 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);
@ -6358,7 +6358,7 @@ 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) {
@ -6369,7 +6369,7 @@ 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);
}
}