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KVM: stats: Support binary stats retrieval for a VCPU 

Add a VCPU ioctl to get a statistics file descriptor by which a read
functionality is provided for userspace to read out VCPU stats header,
descriptors and data.
Define VCPU statistics descriptors and header for all architectures.

Reviewed-by: David Matlack <dmatlack@google.com>
Reviewed-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com> #arm64
Signed-off-by: Jing Zhang <jingzhangos@google.com>
Message-Id: <20210618222709.1858088-5-jingzhangos@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jing Zhang 2021-06-18 22:27:06 +00:00 committed by Paolo Bonzini
parent fcfe1baedd
commit ce55c04945
8 changed files with 359 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/arm64/kvm/guest.c
View File

@ -43,6 +43,27 @@ const struct kvm_stats_header kvm_vm_stats_header = {
sizeof(kvm_vm_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),
STATS_DESC_COUNTER(VCPU, wfi_exit_stat),
STATS_DESC_COUNTER(VCPU, mmio_exit_user),
STATS_DESC_COUNTER(VCPU, mmio_exit_kernel),
STATS_DESC_COUNTER(VCPU, exits)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("halt_successful_poll", generic.halt_successful_poll),
VCPU_STAT("halt_attempted_poll", generic.halt_attempted_poll),

44
arch/mips/kvm/mips.c
View File

@ -53,6 +53,50 @@ const struct kvm_stats_header kvm_vm_stats_header = {
sizeof(kvm_vm_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),
STATS_DESC_COUNTER(VCPU, signal_exits),
STATS_DESC_COUNTER(VCPU, int_exits),
STATS_DESC_COUNTER(VCPU, cop_unusable_exits),
STATS_DESC_COUNTER(VCPU, tlbmod_exits),
STATS_DESC_COUNTER(VCPU, tlbmiss_ld_exits),
STATS_DESC_COUNTER(VCPU, tlbmiss_st_exits),
STATS_DESC_COUNTER(VCPU, addrerr_st_exits),
STATS_DESC_COUNTER(VCPU, addrerr_ld_exits),
STATS_DESC_COUNTER(VCPU, syscall_exits),
STATS_DESC_COUNTER(VCPU, resvd_inst_exits),
STATS_DESC_COUNTER(VCPU, break_inst_exits),
STATS_DESC_COUNTER(VCPU, trap_inst_exits),
STATS_DESC_COUNTER(VCPU, msa_fpe_exits),
STATS_DESC_COUNTER(VCPU, fpe_exits),
STATS_DESC_COUNTER(VCPU, msa_disabled_exits),
STATS_DESC_COUNTER(VCPU, flush_dcache_exits),
STATS_DESC_COUNTER(VCPU, vz_gpsi_exits),
STATS_DESC_COUNTER(VCPU, vz_gsfc_exits),
STATS_DESC_COUNTER(VCPU, vz_hc_exits),
STATS_DESC_COUNTER(VCPU, vz_grr_exits),
STATS_DESC_COUNTER(VCPU, vz_gva_exits),
STATS_DESC_COUNTER(VCPU, vz_ghfc_exits),
STATS_DESC_COUNTER(VCPU, vz_gpa_exits),
STATS_DESC_COUNTER(VCPU, vz_resvd_exits),
#ifdef CONFIG_CPU_LOONGSON64
STATS_DESC_COUNTER(VCPU, vz_cpucfg_exits),
#endif
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("wait", wait_exits),
VCPU_STAT("cache", cache_exits),

45
arch/powerpc/kvm/book3s.c
View File

@ -55,6 +55,51 @@ const struct kvm_stats_header kvm_vm_stats_header = {
sizeof(kvm_vm_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),
STATS_DESC_COUNTER(VCPU, signal_exits),
STATS_DESC_COUNTER(VCPU, light_exits),
STATS_DESC_COUNTER(VCPU, itlb_real_miss_exits),
STATS_DESC_COUNTER(VCPU, itlb_virt_miss_exits),
STATS_DESC_COUNTER(VCPU, dtlb_real_miss_exits),
STATS_DESC_COUNTER(VCPU, dtlb_virt_miss_exits),
STATS_DESC_COUNTER(VCPU, syscall_exits),
STATS_DESC_COUNTER(VCPU, isi_exits),
STATS_DESC_COUNTER(VCPU, dsi_exits),
STATS_DESC_COUNTER(VCPU, emulated_inst_exits),
STATS_DESC_COUNTER(VCPU, dec_exits),
STATS_DESC_COUNTER(VCPU, ext_intr_exits),
STATS_DESC_TIME_NSEC(VCPU, halt_wait_ns),
STATS_DESC_COUNTER(VCPU, halt_successful_wait),
STATS_DESC_COUNTER(VCPU, dbell_exits),
STATS_DESC_COUNTER(VCPU, gdbell_exits),
STATS_DESC_COUNTER(VCPU, ld),
STATS_DESC_COUNTER(VCPU, st),
STATS_DESC_COUNTER(VCPU, pf_storage),
STATS_DESC_COUNTER(VCPU, pf_instruc),
STATS_DESC_COUNTER(VCPU, sp_storage),
STATS_DESC_COUNTER(VCPU, sp_instruc),
STATS_DESC_COUNTER(VCPU, queue_intr),
STATS_DESC_COUNTER(VCPU, ld_slow),
STATS_DESC_COUNTER(VCPU, st_slow),
STATS_DESC_COUNTER(VCPU, pthru_all),
STATS_DESC_COUNTER(VCPU, pthru_host),
STATS_DESC_COUNTER(VCPU, pthru_bad_aff)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("exits", sum_exits),
VCPU_STAT("mmio", mmio_exits),

38
arch/powerpc/kvm/booke.c
View File

@ -53,6 +53,44 @@ const struct kvm_stats_header kvm_vm_stats_header = {
sizeof(kvm_vm_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),
STATS_DESC_COUNTER(VCPU, signal_exits),
STATS_DESC_COUNTER(VCPU, light_exits),
STATS_DESC_COUNTER(VCPU, itlb_real_miss_exits),
STATS_DESC_COUNTER(VCPU, itlb_virt_miss_exits),
STATS_DESC_COUNTER(VCPU, dtlb_real_miss_exits),
STATS_DESC_COUNTER(VCPU, dtlb_virt_miss_exits),
STATS_DESC_COUNTER(VCPU, syscall_exits),
STATS_DESC_COUNTER(VCPU, isi_exits),
STATS_DESC_COUNTER(VCPU, dsi_exits),
STATS_DESC_COUNTER(VCPU, emulated_inst_exits),
STATS_DESC_COUNTER(VCPU, dec_exits),
STATS_DESC_COUNTER(VCPU, ext_intr_exits),
STATS_DESC_TIME_NSEC(VCPU, halt_wait_ns),
STATS_DESC_COUNTER(VCPU, halt_successful_wait),
STATS_DESC_COUNTER(VCPU, dbell_exits),
STATS_DESC_COUNTER(VCPU, gdbell_exits),
STATS_DESC_COUNTER(VCPU, ld),
STATS_DESC_COUNTER(VCPU, st),
STATS_DESC_COUNTER(VCPU, pthru_all),
STATS_DESC_COUNTER(VCPU, pthru_host),
STATS_DESC_COUNTER(VCPU, pthru_bad_aff)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("mmio", mmio_exits),
VCPU_STAT("sig", signal_exits),

108
arch/s390/kvm/kvm-s390.c
View File

@ -78,6 +78,114 @@ const struct kvm_stats_header kvm_vm_stats_header = {
sizeof(kvm_vm_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),
STATS_DESC_COUNTER(VCPU, exit_external_request),
STATS_DESC_COUNTER(VCPU, exit_io_request),
STATS_DESC_COUNTER(VCPU, exit_external_interrupt),
STATS_DESC_COUNTER(VCPU, exit_stop_request),
STATS_DESC_COUNTER(VCPU, exit_validity),
STATS_DESC_COUNTER(VCPU, exit_instruction),
STATS_DESC_COUNTER(VCPU, exit_pei),
STATS_DESC_COUNTER(VCPU, halt_no_poll_steal),
STATS_DESC_COUNTER(VCPU, instruction_lctl),
STATS_DESC_COUNTER(VCPU, instruction_lctlg),
STATS_DESC_COUNTER(VCPU, instruction_stctl),
STATS_DESC_COUNTER(VCPU, instruction_stctg),
STATS_DESC_COUNTER(VCPU, exit_program_interruption),
STATS_DESC_COUNTER(VCPU, exit_instr_and_program),
STATS_DESC_COUNTER(VCPU, exit_operation_exception),
STATS_DESC_COUNTER(VCPU, deliver_ckc),
STATS_DESC_COUNTER(VCPU, deliver_cputm),
STATS_DESC_COUNTER(VCPU, deliver_external_call),
STATS_DESC_COUNTER(VCPU, deliver_emergency_signal),
STATS_DESC_COUNTER(VCPU, deliver_service_signal),
STATS_DESC_COUNTER(VCPU, deliver_virtio),
STATS_DESC_COUNTER(VCPU, deliver_stop_signal),
STATS_DESC_COUNTER(VCPU, deliver_prefix_signal),
STATS_DESC_COUNTER(VCPU, deliver_restart_signal),
STATS_DESC_COUNTER(VCPU, deliver_program),
STATS_DESC_COUNTER(VCPU, deliver_io),
STATS_DESC_COUNTER(VCPU, deliver_machine_check),
STATS_DESC_COUNTER(VCPU, exit_wait_state),
STATS_DESC_COUNTER(VCPU, inject_ckc),
STATS_DESC_COUNTER(VCPU, inject_cputm),
STATS_DESC_COUNTER(VCPU, inject_external_call),
STATS_DESC_COUNTER(VCPU, inject_emergency_signal),
STATS_DESC_COUNTER(VCPU, inject_mchk),
STATS_DESC_COUNTER(VCPU, inject_pfault_init),
STATS_DESC_COUNTER(VCPU, inject_program),
STATS_DESC_COUNTER(VCPU, inject_restart),
STATS_DESC_COUNTER(VCPU, inject_set_prefix),
STATS_DESC_COUNTER(VCPU, inject_stop_signal),
STATS_DESC_COUNTER(VCPU, instruction_epsw),
STATS_DESC_COUNTER(VCPU, instruction_gs),
STATS_DESC_COUNTER(VCPU, instruction_io_other),
STATS_DESC_COUNTER(VCPU, instruction_lpsw),
STATS_DESC_COUNTER(VCPU, instruction_lpswe),
STATS_DESC_COUNTER(VCPU, instruction_pfmf),
STATS_DESC_COUNTER(VCPU, instruction_ptff),
STATS_DESC_COUNTER(VCPU, instruction_sck),
STATS_DESC_COUNTER(VCPU, instruction_sckpf),
STATS_DESC_COUNTER(VCPU, instruction_stidp),
STATS_DESC_COUNTER(VCPU, instruction_spx),
STATS_DESC_COUNTER(VCPU, instruction_stpx),
STATS_DESC_COUNTER(VCPU, instruction_stap),
STATS_DESC_COUNTER(VCPU, instruction_iske),
STATS_DESC_COUNTER(VCPU, instruction_ri),
STATS_DESC_COUNTER(VCPU, instruction_rrbe),
STATS_DESC_COUNTER(VCPU, instruction_sske),
STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock),
STATS_DESC_COUNTER(VCPU, instruction_stsi),
STATS_DESC_COUNTER(VCPU, instruction_stfl),
STATS_DESC_COUNTER(VCPU, instruction_tb),
STATS_DESC_COUNTER(VCPU, instruction_tpi),
STATS_DESC_COUNTER(VCPU, instruction_tprot),
STATS_DESC_COUNTER(VCPU, instruction_tsch),
STATS_DESC_COUNTER(VCPU, instruction_sie),
STATS_DESC_COUNTER(VCPU, instruction_essa),
STATS_DESC_COUNTER(VCPU, instruction_sthyi),
STATS_DESC_COUNTER(VCPU, instruction_sigp_sense),
STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running),
STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call),
STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency),
STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency),
STATS_DESC_COUNTER(VCPU, instruction_sigp_start),
STATS_DESC_COUNTER(VCPU, instruction_sigp_stop),
STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status),
STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status),
STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status),
STATS_DESC_COUNTER(VCPU, instruction_sigp_arch),
STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix),
STATS_DESC_COUNTER(VCPU, instruction_sigp_restart),
STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset),
STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset),
STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown),
STATS_DESC_COUNTER(VCPU, diagnose_10),
STATS_DESC_COUNTER(VCPU, diagnose_44),
STATS_DESC_COUNTER(VCPU, diagnose_9c),
STATS_DESC_COUNTER(VCPU, diagnose_9c_ignored),
STATS_DESC_COUNTER(VCPU, diagnose_9c_forward),
STATS_DESC_COUNTER(VCPU, diagnose_258),
STATS_DESC_COUNTER(VCPU, diagnose_308),
STATS_DESC_COUNTER(VCPU, diagnose_500),
STATS_DESC_COUNTER(VCPU, diagnose_other),
STATS_DESC_COUNTER(VCPU, pfault_sync)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("userspace_handled", exit_userspace),
VCPU_STAT("exit_null", exit_null),

41
arch/x86/kvm/x86.c
View File

@ -248,6 +248,47 @@ const struct kvm_stats_header kvm_vm_stats_header = {
sizeof(kvm_vm_stats_desc),
};
const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
STATS_DESC_COUNTER(VCPU, pf_fixed),
STATS_DESC_COUNTER(VCPU, pf_guest),
STATS_DESC_COUNTER(VCPU, tlb_flush),
STATS_DESC_COUNTER(VCPU, invlpg),
STATS_DESC_COUNTER(VCPU, exits),
STATS_DESC_COUNTER(VCPU, io_exits),
STATS_DESC_COUNTER(VCPU, mmio_exits),
STATS_DESC_COUNTER(VCPU, signal_exits),
STATS_DESC_COUNTER(VCPU, irq_window_exits),
STATS_DESC_COUNTER(VCPU, nmi_window_exits),
STATS_DESC_COUNTER(VCPU, l1d_flush),
STATS_DESC_COUNTER(VCPU, halt_exits),
STATS_DESC_COUNTER(VCPU, request_irq_exits),
STATS_DESC_COUNTER(VCPU, irq_exits),
STATS_DESC_COUNTER(VCPU, host_state_reload),
STATS_DESC_COUNTER(VCPU, fpu_reload),
STATS_DESC_COUNTER(VCPU, insn_emulation),
STATS_DESC_COUNTER(VCPU, insn_emulation_fail),
STATS_DESC_COUNTER(VCPU, hypercalls),
STATS_DESC_COUNTER(VCPU, irq_injections),
STATS_DESC_COUNTER(VCPU, nmi_injections),
STATS_DESC_COUNTER(VCPU, req_event),
STATS_DESC_COUNTER(VCPU, nested_run),
STATS_DESC_COUNTER(VCPU, directed_yield_attempted),
STATS_DESC_COUNTER(VCPU, directed_yield_successful),
STATS_DESC_ICOUNTER(VCPU, guest_mode)
};
static_assert(ARRAY_SIZE(kvm_vcpu_stats_desc) ==
sizeof(struct kvm_vcpu_stat) / sizeof(u64));
const struct kvm_stats_header kvm_vcpu_stats_header = {
.name_size = KVM_STATS_NAME_SIZE,
.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
.id_offset = sizeof(struct kvm_stats_header),
.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
sizeof(kvm_vcpu_stats_desc),
};
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("pf_fixed", pf_fixed),
VCPU_STAT("pf_guest", pf_guest),

13
include/linux/kvm_host.h
View File

@ -305,7 +305,6 @@ struct kvm_vcpu {
struct pid __rcu *pid;
int sigset_active;
sigset_t sigset;
struct kvm_vcpu_stat stat;
unsigned int halt_poll_ns;
bool valid_wakeup;
@ -342,6 +341,8 @@ struct kvm_vcpu {
bool preempted;
bool ready;
struct kvm_vcpu_arch arch;
struct kvm_vcpu_stat stat;
char stats_id[KVM_STATS_NAME_SIZE];
struct kvm_dirty_ring dirty_ring;
};
@ -1358,6 +1359,14 @@ struct _kvm_stats_desc {
#define KVM_GENERIC_VM_STATS() \
STATS_DESC_COUNTER(VM_GENERIC, remote_tlb_flush)
#define KVM_GENERIC_VCPU_STATS() \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_successful_poll), \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_attempted_poll), \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_poll_invalid), \
STATS_DESC_COUNTER(VCPU_GENERIC, halt_wakeup), \
STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_success_ns), \
STATS_DESC_TIME_NSEC(VCPU_GENERIC, halt_poll_fail_ns)
extern struct kvm_stats_debugfs_item debugfs_entries[];
extern struct dentry *kvm_debugfs_dir;
ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
@ -1366,6 +1375,8 @@ ssize_t kvm_stats_read(char *id, const struct kvm_stats_header *header,
char __user *user_buffer, size_t size, loff_t *offset);
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_header kvm_vcpu_stats_header;
extern const struct _kvm_stats_desc kvm_vcpu_stats_desc[];
#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
static inline int mmu_notifier_retry(struct kvm *kvm, unsigned long mmu_seq)

51
virt/kvm/kvm_main.c
View File

@ -3448,6 +3448,10 @@ static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
vcpu->vcpu_idx = atomic_read(&kvm->online_vcpus);
BUG_ON(kvm->vcpus[vcpu->vcpu_idx]);
/* Fill the stats id string for the vcpu */
snprintf(vcpu->stats_id, sizeof(vcpu->stats_id), "kvm-%d/vcpu-%d",
task_pid_nr(current), id);
/* Now it's all set up, let userspace reach it */
kvm_get_kvm(kvm);
r = create_vcpu_fd(vcpu);
@ -3497,6 +3501,44 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
return 0;
}
static ssize_t kvm_vcpu_stats_read(struct file *file, char __user *user_buffer,
size_t size, loff_t *offset)
{
struct kvm_vcpu *vcpu = file->private_data;
return kvm_stats_read(vcpu->stats_id, &kvm_vcpu_stats_header,
&kvm_vcpu_stats_desc[0], &vcpu->stat,
sizeof(vcpu->stat), user_buffer, size, offset);
}
static const struct file_operations kvm_vcpu_stats_fops = {
.read = kvm_vcpu_stats_read,
.llseek = noop_llseek,
};
static int kvm_vcpu_ioctl_get_stats_fd(struct kvm_vcpu *vcpu)
{
int fd;
struct file *file;
char name[15 + ITOA_MAX_LEN + 1];
snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
fd = get_unused_fd_flags(O_CLOEXEC);
if (fd < 0)
return fd;
file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
if (IS_ERR(file)) {
put_unused_fd(fd);
return PTR_ERR(file);
}
file->f_mode |= FMODE_PREAD;
fd_install(fd, file);
return fd;
}
static long kvm_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
@ -3694,6 +3736,10 @@ out_free1:
r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
break;
}
case KVM_GET_STATS_FD: {
r = kvm_vcpu_ioctl_get_stats_fd(vcpu);
break;
}
default:
r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
}
@ -3952,6 +3998,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
#else
return 0;
#endif
case KVM_CAP_BINARY_STATS_FD:
return 1;
default:
break;
}
@ -5254,7 +5302,8 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
kmem_cache_create_usercopy("kvm_vcpu", vcpu_size, vcpu_align,
SLAB_ACCOUNT,
offsetof(struct kvm_vcpu, arch),
sizeof_field(struct kvm_vcpu, arch),
offsetofend(struct kvm_vcpu, stats_id)
- offsetof(struct kvm_vcpu, arch),
NULL);
if (!kvm_vcpu_cache) {
r = -ENOMEM;