Re: [PATCH v4 2/4] KVM: stats: Add fd-based API to read binary stats data

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On Thu, Apr 29, 2021 at 3:37 PM Jing Zhang <jingzhangos@xxxxxxxxxx> wrote:
>
> Provides a file descriptor per VM to read VM stats info/data.
> Provides a file descriptor per vCPU to read vCPU stats info/data.
>
> Signed-off-by: Jing Zhang <jingzhangos@xxxxxxxxxx>
> ---
>  arch/arm64/kvm/guest.c    |  30 +++++
>  arch/mips/kvm/mips.c      |  55 ++++++++++
>  arch/powerpc/kvm/book3s.c |  56 ++++++++++
>  arch/powerpc/kvm/booke.c  |  49 +++++++++
>  arch/s390/kvm/kvm-s390.c  | 121 +++++++++++++++++++++
>  arch/x86/kvm/x86.c        |  57 ++++++++++
>  include/linux/kvm_host.h  | 127 +++++++++++++++++++++-
>  include/uapi/linux/kvm.h  |  50 +++++++++
>  virt/kvm/kvm_main.c       | 223 ++++++++++++++++++++++++++++++++++++++
>  9 files changed, 766 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 0e41331b0911..cf04c2a3a1ce 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -28,6 +28,36 @@
>
>  #include "trace.h"
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = {
> +       STATS_VM_COMMON,
> +};
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
> +       STATS_VCPU_COMMON,
> +       STATS_DESC_COUNTER("hvc_exit_stat"),
> +       STATS_DESC_COUNTER("wfe_exit_stat"),
> +       STATS_DESC_COUNTER("wfi_exit_stat"),
> +       STATS_DESC_COUNTER("mmio_exit_user"),
> +       STATS_DESC_COUNTER("mmio_exit_kernel"),
> +       STATS_DESC_COUNTER("exits"),
> +};
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
>         VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 011c59acd606..ced50e8c1bb2 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -39,6 +39,61 @@
>  #define VECTORSPACING 0x100    /* for EI/VI mode */
>  #endif
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = {
> +       STATS_VM_COMMON,
> +};
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
> +       STATS_VCPU_COMMON,
> +       STATS_DESC_COUNTER("wait_exits"),
> +       STATS_DESC_COUNTER("cache_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("int_exits"),
> +       STATS_DESC_COUNTER("cop_unusable_exits"),
> +       STATS_DESC_COUNTER("tlbmod_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_ld_exits"),
> +       STATS_DESC_COUNTER("tlbmiss_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_st_exits"),
> +       STATS_DESC_COUNTER("addrerr_ld_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("resvd_inst_exits"),
> +       STATS_DESC_COUNTER("break_inst_exits"),
> +       STATS_DESC_COUNTER("trap_inst_exits"),
> +       STATS_DESC_COUNTER("msa_fpe_exits"),
> +       STATS_DESC_COUNTER("fpe_exits"),
> +       STATS_DESC_COUNTER("msa_disabled_exits"),
> +       STATS_DESC_COUNTER("flush_dcache_exits"),
> +#ifdef CONFIG_KVM_MIPS_VZ
> +       STATS_DESC_COUNTER("vz_gpsi_exits"),
> +       STATS_DESC_COUNTER("vz_gsfc_exits"),
> +       STATS_DESC_COUNTER("vz_hc_exits"),
> +       STATS_DESC_COUNTER("vz_grr_exits"),
> +       STATS_DESC_COUNTER("vz_gva_exits"),
> +       STATS_DESC_COUNTER("vz_ghfc_exits"),
> +       STATS_DESC_COUNTER("vz_gpa_exits"),
> +       STATS_DESC_COUNTER("vz_resvd_exits"),
> +#ifdef CONFIG_CPU_LOONGSON64
> +       STATS_DESC_COUNTER("vz_cpucfg_exits"),
> +#endif
> +#endif
> +};
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("wait", wait_exits),
>         VCPU_STAT("cache", cache_exits),
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index bd3a10e1fdaf..9dc2510537ce 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -38,6 +38,62 @@
>
>  /* #define EXIT_DEBUG */
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = {
> +       STATS_VM_COMMON,
> +       STATS_DESC_ICOUNTER("num_2M_pages"),
> +       STATS_DESC_ICOUNTER("num_1G_pages"),
> +};
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
> +       STATS_VCPU_COMMON,
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pf_storage"),
> +       STATS_DESC_COUNTER("pf_instruc"),
> +       STATS_DESC_COUNTER("sp_storage"),
> +       STATS_DESC_COUNTER("sp_instruc"),
> +       STATS_DESC_COUNTER("queue_intr"),
> +       STATS_DESC_COUNTER("ld_slow"),
> +       STATS_DESC_COUNTER("st_slow"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"),
> +};
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exits", sum_exits),
>         VCPU_STAT("mmio", mmio_exits),
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 07fdd7a1254a..e9ffcf0f022d 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -36,6 +36,55 @@
>
>  unsigned long kvmppc_booke_handlers;
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = {
> +       STATS_VM_COMMON,
> +       STATS_DESC_ICOUNTER("num_2M_pages",),
> +       STATS_DESC_ICOUNTER("num_1G_pages",),
> +};
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
> +       STATS_VCPU_COMMON,
> +       STATS_DESC_COUNTER("sum_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("light_exits"),
> +       STATS_DESC_COUNTER("itlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("itlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_real_miss_exits"),
> +       STATS_DESC_COUNTER("dtlb_virt_miss_exits"),
> +       STATS_DESC_COUNTER("syscall_exits"),
> +       STATS_DESC_COUNTER("isi_exits"),
> +       STATS_DESC_COUNTER("dsi_exits"),
> +       STATS_DESC_COUNTER("emulated_inst_exits"),
> +       STATS_DESC_COUNTER("dec_exits"),
> +       STATS_DESC_COUNTER("ext_intr_exits"),
> +       STATS_DESC_TIME_NSEC("halt_wait_ns"),
> +       STATS_DESC_COUNTER("halt_successful_wait"),
> +       STATS_DESC_COUNTER("dbell_exits"),
> +       STATS_DESC_COUNTER("gdbell_exits"),
> +       STATS_DESC_COUNTER("ld"),
> +       STATS_DESC_COUNTER("st"),
> +       STATS_DESC_COUNTER("pthru_all"),
> +       STATS_DESC_COUNTER("pthru_host"),
> +       STATS_DESC_COUNTER("pthru_bad_aff"),
> +};
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("mmio", mmio_exits),
>         VCPU_STAT("sig", signal_exits),
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index d6bf3372bb10..2c91d70754a9 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -58,6 +58,127 @@
>  #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
>                            (KVM_MAX_VCPUS + LOCAL_IRQS))
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = {
> +       STATS_VM_COMMON,
> +       STATS_DESC_COUNTER("inject_io"),
> +       STATS_DESC_COUNTER("inject_float_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_done"),
> +       STATS_DESC_COUNTER("inject_service_signal"),
> +       STATS_DESC_COUNTER("inject_virtio"),
> +};
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
> +       STATS_VCPU_COMMON,
> +       STATS_DESC_COUNTER("exit_userspace"),
> +       STATS_DESC_COUNTER("exit_null"),
> +       STATS_DESC_COUNTER("exit_external_request"),
> +       STATS_DESC_COUNTER("exit_io_request"),
> +       STATS_DESC_COUNTER("exit_external_interrupt"),
> +       STATS_DESC_COUNTER("exit_stop_request"),
> +       STATS_DESC_COUNTER("exit_validity"),
> +       STATS_DESC_COUNTER("exit_instruction"),
> +       STATS_DESC_COUNTER("exit_pei"),
> +       STATS_DESC_COUNTER("halt_no_poll_steal"),
> +       STATS_DESC_COUNTER("instruction_lctl"),
> +       STATS_DESC_COUNTER("instruction_lctlg"),
> +       STATS_DESC_COUNTER("instruction_stctl"),
> +       STATS_DESC_COUNTER("instruction_stctg"),
> +       STATS_DESC_COUNTER("exit_program_interruption"),
> +       STATS_DESC_COUNTER("exit_instr_and_program"),
> +       STATS_DESC_COUNTER("exit_operation_exception"),
> +       STATS_DESC_COUNTER("deliver_ckc"),
> +       STATS_DESC_COUNTER("deliver_cputm"),
> +       STATS_DESC_COUNTER("deliver_external_call"),
> +       STATS_DESC_COUNTER("deliver_emergency_signal"),
> +       STATS_DESC_COUNTER("deliver_service_signal"),
> +       STATS_DESC_COUNTER("deliver_virtio"),
> +       STATS_DESC_COUNTER("deliver_stop_signal"),
> +       STATS_DESC_COUNTER("deliver_prefix_signal"),
> +       STATS_DESC_COUNTER("deliver_restart_signal"),
> +       STATS_DESC_COUNTER("deliver_program"),
> +       STATS_DESC_COUNTER("deliver_io"),
> +       STATS_DESC_COUNTER("deliver_machine_check"),
> +       STATS_DESC_COUNTER("exit_wait_state"),
> +       STATS_DESC_COUNTER("inject_ckc"),
> +       STATS_DESC_COUNTER("inject_cputm"),
> +       STATS_DESC_COUNTER("inject_external_call"),
> +       STATS_DESC_COUNTER("inject_emergency_signal"),
> +       STATS_DESC_COUNTER("inject_mchk"),
> +       STATS_DESC_COUNTER("inject_pfault_init"),
> +       STATS_DESC_COUNTER("inject_program"),
> +       STATS_DESC_COUNTER("inject_restart"),
> +       STATS_DESC_COUNTER("inject_set_prefix"),
> +       STATS_DESC_COUNTER("inject_stop_signal"),
> +       STATS_DESC_COUNTER("instruction_epsw"),
> +       STATS_DESC_COUNTER("instruction_gs"),
> +       STATS_DESC_COUNTER("instruction_io_other"),
> +       STATS_DESC_COUNTER("instruction_lpsw"),
> +       STATS_DESC_COUNTER("instruction_lpswe"),
> +       STATS_DESC_COUNTER("instruction_pfmf"),
> +       STATS_DESC_COUNTER("instruction_ptff"),
> +       STATS_DESC_COUNTER("instruction_sck"),
> +       STATS_DESC_COUNTER("instruction_sckpf"),
> +       STATS_DESC_COUNTER("instruction_stidp"),
> +       STATS_DESC_COUNTER("instruction_spx"),
> +       STATS_DESC_COUNTER("instruction_stpx"),
> +       STATS_DESC_COUNTER("instruction_stap"),
> +       STATS_DESC_COUNTER("instruction_iske"),
> +       STATS_DESC_COUNTER("instruction_ri"),
> +       STATS_DESC_COUNTER("instruction_rrbe"),
> +       STATS_DESC_COUNTER("instruction_sske"),
> +       STATS_DESC_COUNTER("instruction_ipte_interlock"),
> +       STATS_DESC_COUNTER("instruction_stsi"),
> +       STATS_DESC_COUNTER("instruction_stfl"),
> +       STATS_DESC_COUNTER("instruction_tb"),
> +       STATS_DESC_COUNTER("instruction_tpi"),
> +       STATS_DESC_COUNTER("instruction_tprot"),
> +       STATS_DESC_COUNTER("instruction_tsch"),
> +       STATS_DESC_COUNTER("instruction_sie"),
> +       STATS_DESC_COUNTER("instruction_essa"),
> +       STATS_DESC_COUNTER("instruction_sthyi"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense"),
> +       STATS_DESC_COUNTER("instruction_sigp_sense_running"),
> +       STATS_DESC_COUNTER("instruction_sigp_external_call"),
> +       STATS_DESC_COUNTER("instruction_sigp_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_cond_emergency"),
> +       STATS_DESC_COUNTER("instruction_sigp_start"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop"),
> +       STATS_DESC_COUNTER("instruction_sigp_stop_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_store_adtl_status"),
> +       STATS_DESC_COUNTER("instruction_sigp_arch"),
> +       STATS_DESC_COUNTER("instruction_sigp_prefix"),
> +       STATS_DESC_COUNTER("instruction_sigp_restart"),
> +       STATS_DESC_COUNTER("instruction_sigp_init_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_cpu_reset"),
> +       STATS_DESC_COUNTER("instruction_sigp_unknown"),
> +       STATS_DESC_COUNTER("diagnose_10"),
> +       STATS_DESC_COUNTER("diagnose_44"),
> +       STATS_DESC_COUNTER("diagnose_9c"),
> +       STATS_DESC_COUNTER("diagnose_9c_ignored"),
> +       STATS_DESC_COUNTER("diagnose_258"),
> +       STATS_DESC_COUNTER("diagnose_308"),
> +       STATS_DESC_COUNTER("diagnose_500"),
> +       STATS_DESC_COUNTER("diagnose_other"),
> +       STATS_DESC_COUNTER("pfault_sync"),
> +};
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("userspace_handled", exit_userspace),
>         VCPU_STAT("exit_null", exit_null),
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index e1207fd8b40d..dc55de1f958f 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -217,6 +217,63 @@ EXPORT_SYMBOL_GPL(host_xss);
>  u64 __read_mostly supported_xss;
>  EXPORT_SYMBOL_GPL(supported_xss);
>
> +struct _kvm_stats_desc kvm_vm_stats_desc[] = {
> +       STATS_VM_COMMON,
> +       STATS_DESC_COUNTER("mmu_shadow_zapped"),
> +       STATS_DESC_COUNTER("mmu_pte_write"),
> +       STATS_DESC_COUNTER("mmu_pde_zapped"),
> +       STATS_DESC_COUNTER("mmu_flooded"),
> +       STATS_DESC_COUNTER("mmu_recycled"),
> +       STATS_DESC_COUNTER("mmu_cache_miss"),
> +       STATS_DESC_ICOUNTER("mmu_unsync"),
> +       STATS_DESC_ICOUNTER("largepages"),
> +       STATS_DESC_ICOUNTER("nx_largepages_splits"),
> +       STATS_DESC_ICOUNTER("max_mmu_page_hash_collisions"),
> +};
> +
> +struct _kvm_stats_header kvm_vm_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vm_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vm_stats_desc),
> +};
> +
> +struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
> +       STATS_VCPU_COMMON,
> +       STATS_DESC_COUNTER("pf_fixed"),
> +       STATS_DESC_COUNTER("pf_guest"),
> +       STATS_DESC_COUNTER("tlb_flush"),
> +       STATS_DESC_COUNTER("invlpg"),
> +       STATS_DESC_COUNTER("exits"),
> +       STATS_DESC_COUNTER("io_exits"),
> +       STATS_DESC_COUNTER("mmio_exits"),
> +       STATS_DESC_COUNTER("signal_exits"),
> +       STATS_DESC_COUNTER("irq_window_exits"),
> +       STATS_DESC_COUNTER("nmi_window_exits"),
> +       STATS_DESC_COUNTER("l1d_flush"),
> +       STATS_DESC_COUNTER("halt_exits"),
> +       STATS_DESC_COUNTER("request_irq_exits"),
> +       STATS_DESC_COUNTER("irq_exits"),
> +       STATS_DESC_COUNTER("host_state_reload"),
> +       STATS_DESC_COUNTER("fpu_reload"),
> +       STATS_DESC_COUNTER("insn_emulation"),
> +       STATS_DESC_COUNTER("insn_emulation_fail"),
> +       STATS_DESC_COUNTER("hypercalls"),
> +       STATS_DESC_COUNTER("irq_injections"),
> +       STATS_DESC_COUNTER("nmi_injections"),
> +       STATS_DESC_COUNTER("req_event"),
> +       STATS_DESC_COUNTER("nested_run"),
> +};
> +
> +struct _kvm_stats_header kvm_vcpu_stats_header = {
> +       .name_size = KVM_STATS_NAME_LEN,
> +       .count = ARRAY_SIZE(kvm_vcpu_stats_desc),
> +       .desc_offset = sizeof(struct kvm_stats_header),
> +       .data_offset = sizeof(struct kvm_stats_header) +
> +               sizeof(kvm_vcpu_stats_desc),
> +};
> +
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("pf_fixed", pf_fixed),
>         VCPU_STAT("pf_guest", pf_guest),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 9286516094e3..796d97c8bbf0 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1201,12 +1201,25 @@ struct kvm_stats_debugfs_item {
>         int mode;
>  };
>
> +struct _kvm_stats_header {
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_NAME_LEN     32
According to the warning reported by kernel test robot <lkp@xxxxxxxxx>,
will change the maximum length to 48 to accommodate some long stats
name for s390.
> +struct _kvm_stats_desc {
> +       struct kvm_stats_desc desc;
> +       char name[KVM_STATS_NAME_LEN];
> +};
> +
>  #define KVM_DBGFS_GET_MODE(dbgfs_item)                                         \
>         ((dbgfs_item)->mode ? (dbgfs_item)->mode : 0644)
>
> -#define VM_STAT(n, x, ...)                                                     \
> +#define VM_STAT(n, x, ...)                                                    \
>         { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)                                                   \
> +#define VCPU_STAT(n, x, ...)                                                  \
>         { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
>  #define VM_STAT_COM(n, x, ...)                                                        \
>         { n, offsetof(struct kvm, stat.common.x), KVM_STAT_VM, ## __VA_ARGS__ }
> @@ -1214,8 +1227,118 @@ struct kvm_stats_debugfs_item {
>         { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
>           KVM_STAT_VCPU, ## __VA_ARGS__ }
>
> +#define STATS_DESC(name, type, unit, scale, exponent)                         \
> +       {                                                                      \
> +               {type | unit | scale, exponent, 1}, name,                      \
> +       }
> +#define STATS_DESC_CUMULATIVE(name, unit, scale, exponent)                    \
> +       STATS_DESC(name, KVM_STATS_TYPE_CUMULATIVE, unit, scale, exponent)
> +#define STATS_DESC_INSTANT(name, unit, scale, exponent)                               \
> +       STATS_DESC(name, KVM_STATS_TYPE_INSTANT, unit, scale, exponent)
> +
> +/* Cumulative counter */
> +#define STATS_DESC_COUNTER(name)                                              \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_NONE,                       \
> +               KVM_STATS_SCALE_POW10, 0)
> +/* Instantaneous counter */
> +#define STATS_DESC_ICOUNTER(name)                                             \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_NONE,                          \
> +               KVM_STATS_SCALE_POW10, 0)
> +
> +/* Cumulative clock cycles */
> +#define STATS_DESC_CYCLE(name)                                                \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_CYCLES,                     \
> +               KVM_STATS_SCALE_POW10, 0)
> +/* Instantaneous clock cycles */
> +#define STATS_DESC_ICYCLE(name)                                                       \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_CYCLES,                        \
> +               KVM_STATS_SCALE_POW10, 0)
> +
> +/* Cumulative memory size in Byte */
> +#define STATS_DESC_SIZE_BYTE(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_SCALE_POW2, 0)
> +/* Cumulative memory size in KiByte */
> +#define STATS_DESC_SIZE_KBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_SCALE_POW2, 10)
> +/* Cumulative memory size in MiByte */
> +#define STATS_DESC_SIZE_MBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_SCALE_POW2, 20)
> +/* Cumulative memory size in GiByte */
> +#define STATS_DESC_SIZE_GBYTE(name)                                           \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_BYTES,                      \
> +               KVM_STATS_SCALE_POW2, 30)
> +
> +/* Instantaneous memory size in Byte */
> +#define STATS_DESC_ISIZE_BYTE(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_SCALE_POW2, 0)
> +/* Instantaneous memory size in KiByte */
> +#define STATS_DESC_ISIZE_KBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_SCALE_POW2, 10)
> +/* Instantaneous memory size in MiByte */
> +#define STATS_DESC_ISIZE_MBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_SCALE_POW2, 20)
> +/* Instantaneous memory size in GiByte */
> +#define STATS_DESC_ISIZE_GBYTE(name)                                          \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_BYTES,                         \
> +               KVM_STATS_SCALE_POW2, 30)
> +
> +/* Cumulative time in second */
> +#define STATS_DESC_TIME_SEC(name)                                             \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_SCALE_POW10, 0)
> +/* Cumulative time in millisecond */
> +#define STATS_DESC_TIME_MSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_SCALE_POW10, -3)
> +/* Cumulative time in microsecond */
> +#define STATS_DESC_TIME_USEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_SCALE_POW10, -6)
> +/* Cumulative time in nanosecond */
> +#define STATS_DESC_TIME_NSEC(name)                                            \
> +       STATS_DESC_CUMULATIVE(name, KVM_STATS_UNIT_SECONDS,                    \
> +               KVM_STATS_SCALE_POW10, -9)
> +
> +/* Instantaneous time in second */
> +#define STATS_DESC_ITIME_SEC(name)                                            \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_SCALE_POW10, 0)
> +/* Instantaneous time in millisecond */
> +#define STATS_DESC_ITIME_MSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_SCALE_POW10, -3)
> +/* Instantaneous time in microsecond */
> +#define STATS_DESC_ITIME_USEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_SCALE_POW10, -6)
> +/* Instantaneous time in nanosecond */
> +#define STATS_DESC_ITIME_NSEC(name)                                           \
> +       STATS_DESC_INSTANT(name, KVM_STATS_UNIT_SECONDS,                       \
> +               KVM_STATS_SCALE_POW10, -9)
> +
> +#define STATS_VM_COMMON                                                               \
> +       STATS_DESC_COUNTER("remote_tlb_flush")
> +
> +#define STATS_VCPU_COMMON                                                     \
> +       STATS_DESC_COUNTER("halt_successful_poll"),                            \
> +       STATS_DESC_COUNTER("halt_attempted_poll"),                             \
> +       STATS_DESC_COUNTER("halt_poll_invalid"),                               \
> +       STATS_DESC_COUNTER("halt_wakeup"),                                     \
> +       STATS_DESC_TIME_NSEC("halt_poll_success_ns"),                          \
> +       STATS_DESC_TIME_NSEC("halt_poll_fail_ns")
> +
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> +extern struct _kvm_stats_header kvm_vm_stats_header;
> +extern struct _kvm_stats_header kvm_vcpu_stats_header;
> +extern struct _kvm_stats_desc kvm_vm_stats_desc[];
> +extern 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)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 1fb4fd863324..e7b8dc8fe7a4 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1083,6 +1083,7 @@ struct kvm_ppc_resize_hpt {
>  #define KVM_CAP_VM_COPY_ENC_CONTEXT_FROM 197
>  #define KVM_CAP_PTP_KVM 198
>  #define KVM_CAP_EXIT_HYPERCALL 199
> +#define KVM_CAP_STATS_BINARY_FD 200
>
>  #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -1899,4 +1900,53 @@ struct kvm_dirty_gfn {
>  #define KVM_BUS_LOCK_DETECTION_OFF             (1 << 0)
>  #define KVM_BUS_LOCK_DETECTION_EXIT            (1 << 1)
>
> +#define KVM_STATS_ID_MAXLEN            64
> +
> +struct kvm_stats_header {
> +       char id[KVM_STATS_ID_MAXLEN];
> +       __u32 name_size;
> +       __u32 count;
> +       __u32 desc_offset;
> +       __u32 data_offset;
> +};
> +
> +#define KVM_STATS_TYPE_SHIFT           0
> +#define KVM_STATS_TYPE_MASK            (0xF << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_CUMULATIVE      (0x0 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_INSTANT         (0x1 << KVM_STATS_TYPE_SHIFT)
> +#define KVM_STATS_TYPE_MAX             KVM_STATS_TYPE_INSTANT
> +
> +#define KVM_STATS_UNIT_SHIFT           4
> +#define KVM_STATS_UNIT_MASK            (0xF << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_NONE            (0x0 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_BYTES           (0x1 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_SECONDS         (0x2 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_CYCLES          (0x3 << KVM_STATS_UNIT_SHIFT)
> +#define KVM_STATS_UNIT_MAX             KVM_STATS_UNIT_CYCLES
> +
> +#define KVM_STATS_SCALE_SHIFT          8
> +#define KVM_STATS_SCALE_MASK           (0xF << KVM_STATS_SCALE_SHIFT)
> +#define KVM_STATS_SCALE_POW10          (0x0 << KVM_STATS_SCALE_SHIFT)
> +#define KVM_STATS_SCALE_POW2           (0x1 << KVM_STATS_SCALE_SHIFT)
> +#define KVM_STATS_SCALE_MAX            KVM_STATS_SCALE_POW2
> +
> +struct kvm_stats_desc {
> +       __u32 flags;
> +       __s16 exponent;
> +       __u16 size;
> +       __u32 unused1;
> +       __u32 unused2;
> +       char name[0];
> +};
> +
> +struct kvm_vm_stats_data {
> +       unsigned long value[0];
> +};
> +
> +struct kvm_vcpu_stats_data {
> +       __u64 value[0];
> +};
> +
> +#define KVM_STATS_GETFD  _IOR(KVMIO,  0xcc, struct kvm_stats_header)
> +
>  #endif /* __LINUX_KVM_H */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index cdf53fb75ca1..c48089ab366c 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -3458,6 +3458,115 @@ 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)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm_vcpu *vcpu = file->private_data;
> +       ssize_t copylen, len, remain = size;
> +       size_t size_header, size_desc, size_stats;
> +       loff_t pos = *offset;
> +       char __user *dest = user_buffer;
> +       void *src;
> +
> +       snprintf(id, sizeof(id), "kvm-%d/vcpu-%d",
> +                       task_pid_nr(current), vcpu->vcpu_id);
> +       size_header = sizeof(kvm_vcpu_stats_header);
> +       size_desc =
> +               kvm_vcpu_stats_header.count * sizeof(struct _kvm_stats_desc);
> +       size_stats = sizeof(vcpu->stat);
> +
> +       len = sizeof(id) + size_header + size_desc + size_stats - pos;
> +       len = min(len, remain);
> +       if (len <= 0)
> +               return 0;
> +       remain = len;
> +
> +       /* Copy kvm vcpu stats header id string */
> +       copylen = sizeof(id) - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)id + pos;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm vcpu stats header */
> +       copylen = sizeof(id) + size_header - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)&kvm_vcpu_stats_header;
> +               src += pos - sizeof(id);
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm vcpu stats descriptors */
> +       copylen = kvm_vcpu_stats_header.desc_offset + size_desc - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)&kvm_vcpu_stats_desc;
> +               src += pos - kvm_vcpu_stats_header.desc_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm vcpu stats values */
> +       copylen = kvm_vcpu_stats_header.data_offset + size_stats - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)&vcpu->stat;
> +               src += pos - kvm_vcpu_stats_header.data_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +
> +       *offset = pos;
> +       return len;
> +}
> +
> +static struct file_operations kvm_vcpu_stats_fops = {
> +       .read = kvm_vcpu_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vcpu_ioctl_get_statsfd(struct kvm_vcpu *vcpu)
> +{
> +       int error, fd;
> +       struct file *file;
> +       char name[15 + ITOA_MAX_LEN + 1];
> +
> +       snprintf(name, sizeof(name), "kvm-vcpu-stats:%d", vcpu->vcpu_id);
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile(name, &kvm_vcpu_stats_fops, vcpu, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vcpu_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -3655,6 +3764,10 @@ static long kvm_vcpu_ioctl(struct file *filp,
>                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
>                 break;
>         }
> +       case KVM_STATS_GETFD: {
> +               r = kvm_vcpu_ioctl_get_statsfd(vcpu);
> +               break;
> +       }
>         default:
>                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
>         }
> @@ -3913,6 +4026,8 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
>  #else
>                 return 0;
>  #endif
> +       case KVM_CAP_STATS_BINARY_FD:
> +               return 1;
>         default:
>                 break;
>         }
> @@ -4016,6 +4131,111 @@ static int kvm_vm_ioctl_enable_cap_generic(struct kvm *kvm,
>         }
>  }
>
> +static ssize_t kvm_vm_stats_read(struct file *file, char __user *user_buffer,
> +                             size_t size, loff_t *offset)
> +{
> +       char id[KVM_STATS_ID_MAXLEN];
> +       struct kvm *kvm = file->private_data;
> +       ssize_t copylen, len, remain = size;
> +       size_t size_header, size_desc, size_stats;
> +       loff_t pos = *offset;
> +       char __user *dest = user_buffer;
> +       void *src;
> +
> +       snprintf(id, sizeof(id), "kvm-%d", task_pid_nr(current));
> +       size_header = sizeof(kvm_vm_stats_header);
> +       size_desc = kvm_vm_stats_header.count * sizeof(struct _kvm_stats_desc);
> +       size_stats = sizeof(kvm->stat);
> +
> +       len = sizeof(id) + size_header + size_desc + size_stats - pos;
> +       len = min(len, remain);
> +       if (len <= 0)
> +               return 0;
> +       remain = len;
> +
> +       /* Copy kvm vm stats header id string */
> +       copylen = sizeof(id) - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)id + pos;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm vm stats header */
> +       copylen = sizeof(id) + size_header - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)&kvm_vm_stats_header;
> +               src += pos - sizeof(id);
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm vm stats descriptors */
> +       copylen = kvm_vm_stats_header.desc_offset + size_desc - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)&kvm_vm_stats_desc;
> +               src += pos - kvm_vm_stats_header.desc_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +       /* Copy kvm vm stats values */
> +       copylen = kvm_vm_stats_header.data_offset + size_stats - pos;
> +       copylen = min(copylen, remain);
> +       if (copylen > 0) {
> +               src = (void *)&kvm->stat;
> +               src += pos - kvm_vm_stats_header.data_offset;
> +               if (copy_to_user(dest, src, copylen))
> +                       return -EFAULT;
> +               remain -= copylen;
> +               pos += copylen;
> +               dest += copylen;
> +       }
> +
> +       *offset = pos;
> +       return len;
> +}
> +
> +static struct file_operations kvm_vm_stats_fops = {
> +       .read = kvm_vm_stats_read,
> +       .llseek = noop_llseek,
> +};
> +
> +static int kvm_vm_ioctl_get_statsfd(struct kvm *kvm)
> +{
> +       int error, fd;
> +       struct file *file;
> +
> +       error = get_unused_fd_flags(O_CLOEXEC);
> +       if (error < 0)
> +               return error;
> +       fd = error;
> +
> +       file = anon_inode_getfile("kvm-vm-stats",
> +                       &kvm_vm_stats_fops, kvm, O_RDONLY);
> +       if (IS_ERR(file)) {
> +               error = PTR_ERR(file);
> +               goto err_put_unused_fd;
> +       }
> +       file->f_mode |= FMODE_PREAD;
> +       fd_install(fd, file);
> +
> +       return fd;
> +
> +err_put_unused_fd:
> +       put_unused_fd(fd);
> +       return error;
> +}
> +
>  static long kvm_vm_ioctl(struct file *filp,
>                            unsigned int ioctl, unsigned long arg)
>  {
> @@ -4198,6 +4418,9 @@ static long kvm_vm_ioctl(struct file *filp,
>         case KVM_RESET_DIRTY_RINGS:
>                 r = kvm_vm_ioctl_reset_dirty_pages(kvm);
>                 break;
> +       case KVM_STATS_GETFD:
> +               r = kvm_vm_ioctl_get_statsfd(kvm);
> +               break;
>         default:
>                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
>         }
> --
> 2.31.1.527.g47e6f16901-goog
>



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