Re: [PATCH v5 1/4] KVM: stats: Separate common stats from architecture specific ones

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On Mon, May 17, 2021 at 9:24 AM Jing Zhang <jingzhangos@xxxxxxxxxx> wrote:
>
> Put all common statistics in a separate structure to ease
> statistics handling for the incoming new statistics API.
>
> No functional change intended.
>
> Signed-off-by: Jing Zhang <jingzhangos@xxxxxxxxxx>
> ---
>  arch/arm64/include/asm/kvm_host.h   |  9 ++-------
>  arch/arm64/kvm/guest.c              | 12 ++++++------
>  arch/mips/include/asm/kvm_host.h    |  9 ++-------
>  arch/mips/kvm/mips.c                | 12 ++++++------
>  arch/powerpc/include/asm/kvm_host.h |  9 ++-------
>  arch/powerpc/kvm/book3s.c           | 12 ++++++------
>  arch/powerpc/kvm/book3s_hv.c        | 12 ++++++------
>  arch/powerpc/kvm/book3s_pr.c        |  2 +-
>  arch/powerpc/kvm/book3s_pr_papr.c   |  2 +-
>  arch/powerpc/kvm/booke.c            | 14 +++++++-------
>  arch/s390/include/asm/kvm_host.h    |  9 ++-------
>  arch/s390/kvm/kvm-s390.c            | 12 ++++++------
>  arch/x86/include/asm/kvm_host.h     |  9 ++-------
>  arch/x86/kvm/x86.c                  | 14 +++++++-------
>  include/linux/kvm_host.h            |  9 +++++++--
>  include/linux/kvm_types.h           | 12 ++++++++++++
>  virt/kvm/kvm_main.c                 | 14 +++++++-------
>  17 files changed, 82 insertions(+), 90 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 7cd7d5c8c4bc..f3ad7a20b0af 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -556,16 +556,11 @@ static inline bool __vcpu_write_sys_reg_to_cpu(u64 val, int reg)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
> +       struct kvm_vcpu_stat_common common;
>         u64 hvc_exit_stat;
>         u64 wfe_exit_stat;
>         u64 wfi_exit_stat;
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 5cb4a1cd5603..0e41331b0911 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -29,18 +29,18 @@
>  #include "trace.h"
>
>  struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),

nit: I may be alone in this but I find using the  the following more readable:

        VCPU_STAT("halt_wakeup", common.halt_wakeup),

>         VCPU_STAT("hvc_exit_stat", hvc_exit_stat),
>         VCPU_STAT("wfe_exit_stat", wfe_exit_stat),
>         VCPU_STAT("wfi_exit_stat", wfi_exit_stat),
>         VCPU_STAT("mmio_exit_user", mmio_exit_user),
>         VCPU_STAT("mmio_exit_kernel", mmio_exit_kernel),
>         VCPU_STAT("exits", exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         { NULL }
>  };
>
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index fca4547d580f..6f610fbcd8d1 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -109,10 +109,11 @@ static inline bool kvm_is_error_hva(unsigned long addr)
>  }
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 wait_exits;
>         u64 cache_exits;
>         u64 signal_exits;
> @@ -142,12 +143,6 @@ struct kvm_vcpu_stat {
>  #ifdef CONFIG_CPU_LOONGSON64
>         u64 vz_cpucfg_exits;
>  #endif
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 4d4af97dcc88..f4fc60c05e9c 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -68,12 +68,12 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>  #ifdef CONFIG_CPU_LOONGSON64
>         VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
>  #endif
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         {NULL}
>  };
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 1e83359f286b..473d9d0804ff 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -80,12 +80,13 @@ struct kvmppc_book3s_shadow_vcpu;
>  struct kvm_nested_guest;
>
>  struct kvm_vm_stat {
> -       ulong remote_tlb_flush;
> +       struct kvm_vm_stat_common common;
>         ulong num_2M_pages;
>         ulong num_1G_pages;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 sum_exits;
>         u64 mmio_exits;
>         u64 signal_exits;
> @@ -101,14 +102,8 @@ struct kvm_vcpu_stat {
>         u64 emulated_inst_exits;
>         u64 dec_exits;
>         u64 ext_intr_exits;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 halt_wait_ns;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
>         u64 halt_successful_wait;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 dbell_exits;
>         u64 gdbell_exits;
>         u64 ld;
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index 2b691f4d1f26..bd3a10e1fdaf 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -47,14 +47,14 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
>         VCPU_STAT("queue_intr", queue_intr),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
>         VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("pf_storage", pf_storage),
>         VCPU_STAT("sp_storage", sp_storage),
>         VCPU_STAT("pf_instruc", pf_instruc),
> diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
> index 28a80d240b76..58e187e03c52 100644
> --- a/arch/powerpc/kvm/book3s_hv.c
> +++ b/arch/powerpc/kvm/book3s_hv.c
> @@ -236,7 +236,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
>
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp))
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>
>         cpu = READ_ONCE(vcpu->arch.thread_cpu);
>         if (cpu >= 0 && kvmppc_ipi_thread(cpu))
> @@ -3925,7 +3925,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>         cur = start_poll = ktime_get();
>         if (vc->halt_poll_ns) {
>                 ktime_t stop = ktime_add_ns(start_poll, vc->halt_poll_ns);
> -               ++vc->runner->stat.halt_attempted_poll;
> +               ++vc->runner->stat.common.halt_attempted_poll;
>
>                 vc->vcore_state = VCORE_POLLING;
>                 spin_unlock(&vc->lock);
> @@ -3942,7 +3942,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 vc->vcore_state = VCORE_INACTIVE;
>
>                 if (!do_sleep) {
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                         goto out;
>                 }
>         }
> @@ -3954,7 +3954,7 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                 do_sleep = 0;
>                 /* If we polled, count this as a successful poll */
>                 if (vc->halt_poll_ns)
> -                       ++vc->runner->stat.halt_successful_poll;
> +                       ++vc->runner->stat.common.halt_successful_poll;
>                 goto out;
>         }
>
> @@ -3981,13 +3981,13 @@ static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
>                         ktime_to_ns(cur) - ktime_to_ns(start_wait);
>                 /* Attribute failed poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_fail_ns +=
> +                       vc->runner->stat.common.halt_poll_fail_ns +=
>                                 ktime_to_ns(start_wait) -
>                                 ktime_to_ns(start_poll);
>         } else {
>                 /* Attribute successful poll time */
>                 if (vc->halt_poll_ns)
> -                       vc->runner->stat.halt_poll_success_ns +=
> +                       vc->runner->stat.common.halt_poll_success_ns +=
>                                 ktime_to_ns(cur) -
>                                 ktime_to_ns(start_poll);
>         }
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index d7733b07f489..214caa9d9675 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -493,7 +493,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
>                 if (!vcpu->arch.pending_exceptions) {
>                         kvm_vcpu_block(vcpu);
>                         kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -                       vcpu->stat.halt_wakeup++;
> +                       vcpu->stat.common.halt_wakeup++;
>
>                         /* Unset POW bit after we woke up */
>                         msr &= ~MSR_POW;
> diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
> index 031c8015864a..9384625c8051 100644
> --- a/arch/powerpc/kvm/book3s_pr_papr.c
> +++ b/arch/powerpc/kvm/book3s_pr_papr.c
> @@ -378,7 +378,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
>                 kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
>                 kvm_vcpu_block(vcpu);
>                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
> -               vcpu->stat.halt_wakeup++;
> +               vcpu->stat.common.halt_wakeup++;
>                 return EMULATE_DONE;
>         case H_LOGICAL_CI_LOAD:
>                 return kvmppc_h_pr_logical_ci_load(vcpu);
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 7d5fe43f85c4..07fdd7a1254a 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -49,15 +49,15 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("inst_emu", emulated_inst_exits),
>         VCPU_STAT("dec", dec_exits),
>         VCPU_STAT("ext_intr", ext_intr_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("doorbell", dbell_exits),
>         VCPU_STAT("guest doorbell", gdbell_exits),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         { NULL }
>  };
>
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 8925f3969478..57a20897f3db 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -361,6 +361,7 @@ struct sie_page {
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 exit_userspace;
>         u64 exit_null;
>         u64 exit_external_request;
> @@ -370,13 +371,7 @@ struct kvm_vcpu_stat {
>         u64 exit_validity;
>         u64 exit_instruction;
>         u64 exit_pei;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
>         u64 halt_no_poll_steal;
> -       u64 halt_wakeup;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 instruction_lctl;
>         u64 instruction_lctlg;
>         u64 instruction_stctl;
> @@ -755,12 +750,12 @@ struct kvm_vcpu_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         u64 inject_io;
>         u64 inject_float_mchk;
>         u64 inject_pfault_done;
>         u64 inject_service_signal;
>         u64 inject_virtio;
> -       u64 remote_tlb_flush;
>  };
>
>  struct kvm_arch_memory_slot {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 1296fc10f80c..d6bf3372bb10 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -72,13 +72,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("exit_program_interruption", exit_program_interruption),
>         VCPU_STAT("exit_instr_and_program_int", exit_instr_and_program),
>         VCPU_STAT("exit_operation_exception", exit_operation_exception),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
>         VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("instruction_lctlg", instruction_lctlg),
>         VCPU_STAT("instruction_lctl", instruction_lctl),
>         VCPU_STAT("instruction_stctl", instruction_stctl),
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 55efbacfc244..5bfd6893fbf6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1127,6 +1127,7 @@ struct kvm_arch {
>  };
>
>  struct kvm_vm_stat {
> +       struct kvm_vm_stat_common common;
>         ulong mmu_shadow_zapped;
>         ulong mmu_pte_write;
>         ulong mmu_pde_zapped;
> @@ -1134,13 +1135,13 @@ struct kvm_vm_stat {
>         ulong mmu_recycled;
>         ulong mmu_cache_miss;
>         ulong mmu_unsync;
> -       ulong remote_tlb_flush;
>         ulong lpages;
>         ulong nx_lpage_splits;
>         ulong max_mmu_page_hash_collisions;
>  };
>
>  struct kvm_vcpu_stat {
> +       struct kvm_vcpu_stat_common common;
>         u64 pf_fixed;
>         u64 pf_guest;
>         u64 tlb_flush;
> @@ -1154,10 +1155,6 @@ struct kvm_vcpu_stat {
>         u64 nmi_window_exits;
>         u64 l1d_flush;
>         u64 halt_exits;
> -       u64 halt_successful_poll;
> -       u64 halt_attempted_poll;
> -       u64 halt_poll_invalid;
> -       u64 halt_wakeup;
>         u64 request_irq_exits;
>         u64 irq_exits;
>         u64 host_state_reload;
> @@ -1168,8 +1165,6 @@ struct kvm_vcpu_stat {
>         u64 irq_injections;
>         u64 nmi_injections;
>         u64 req_event;
> -       u64 halt_poll_success_ns;
> -       u64 halt_poll_fail_ns;
>         u64 nested_run;
>         u64 directed_yield_attempted;
>         u64 directed_yield_successful;
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 9b6bca616929..9a93d80caff6 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -226,10 +226,10 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("irq_window", irq_window_exits),
>         VCPU_STAT("nmi_window", nmi_window_exits),
>         VCPU_STAT("halt_exits", halt_exits),
> -       VCPU_STAT("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_wakeup", halt_wakeup),
> +       VCPU_STAT_COM("halt_successful_poll", halt_successful_poll),
> +       VCPU_STAT_COM("halt_attempted_poll", halt_attempted_poll),
> +       VCPU_STAT_COM("halt_poll_invalid", halt_poll_invalid),
> +       VCPU_STAT_COM("halt_wakeup", halt_wakeup),
>         VCPU_STAT("hypercalls", hypercalls),
>         VCPU_STAT("request_irq", request_irq_exits),
>         VCPU_STAT("irq_exits", irq_exits),
> @@ -241,8 +241,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VCPU_STAT("nmi_injections", nmi_injections),
>         VCPU_STAT("req_event", req_event),
>         VCPU_STAT("l1d_flush", l1d_flush),
> -       VCPU_STAT("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT("halt_poll_fail_ns", halt_poll_fail_ns),
> +       VCPU_STAT_COM("halt_poll_success_ns", halt_poll_success_ns),
> +       VCPU_STAT_COM("halt_poll_fail_ns", halt_poll_fail_ns),
>         VCPU_STAT("nested_run", nested_run),
>         VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
>         VCPU_STAT("directed_yield_successful", directed_yield_successful),
> @@ -253,7 +253,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>         VM_STAT("mmu_recycled", mmu_recycled),
>         VM_STAT("mmu_cache_miss", mmu_cache_miss),
>         VM_STAT("mmu_unsync", mmu_unsync),
> -       VM_STAT("remote_tlb_flush", remote_tlb_flush),
> +       VM_STAT_COM("remote_tlb_flush", remote_tlb_flush),
>         VM_STAT("largepages", lpages, .mode = 0444),
>         VM_STAT("nx_largepages_splitted", nx_lpage_splits, .mode = 0444),
>         VM_STAT("max_mmu_page_hash_collisions", max_mmu_page_hash_collisions),
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 2f34487e21f2..97700e41db3b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -1243,10 +1243,15 @@ struct kvm_stats_debugfs_item {
>  #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__ }
> +#define VCPU_STAT_COM(n, x, ...)                                              \
> +       { n, offsetof(struct kvm_vcpu, stat.common.x),                         \
> +         KVM_STAT_VCPU, ## __VA_ARGS__ }
>
>  extern struct kvm_stats_debugfs_item debugfs_entries[];
>  extern struct dentry *kvm_debugfs_dir;
> diff --git a/include/linux/kvm_types.h b/include/linux/kvm_types.h
> index a7580f69dda0..87eb05ad678b 100644
> --- a/include/linux/kvm_types.h
> +++ b/include/linux/kvm_types.h
> @@ -76,5 +76,17 @@ struct kvm_mmu_memory_cache {
>  };
>  #endif
>
> +struct kvm_vm_stat_common {
> +       ulong remote_tlb_flush;
> +};
> +
> +struct kvm_vcpu_stat_common {
> +       u64 halt_successful_poll;
> +       u64 halt_attempted_poll;
> +       u64 halt_poll_invalid;
> +       u64 halt_wakeup;
> +       u64 halt_poll_success_ns;
> +       u64 halt_poll_fail_ns;
> +};

Putting a "_common" struct here is the opposite of the pattern than
what KVM uses for struct kvm and struct kvm_vcpu. What are your
thoughts on inverting it so the common stats go in struct
kvm_{vcpu,vm}_stat and the arch-specific stats go in a arch-specific
struct kvm_{vcpu,vm}_stat_arch?

I imagine this may result in more churn in this patch since there are
more arch-specific stats than there are common stats, but would result
in a more consistent struct layout.


>
>  #endif /* __KVM_TYPES_H__ */
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index 6b4feb92dc79..34a4cf265297 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -330,7 +330,7 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
>          */
>         if (!kvm_arch_flush_remote_tlb(kvm)
>             || kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
> -               ++kvm->stat.remote_tlb_flush;
> +               ++kvm->stat.common.remote_tlb_flush;
>         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
>  }
>  EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
> @@ -2940,9 +2940,9 @@ static inline void
>  update_halt_poll_stats(struct kvm_vcpu *vcpu, u64 poll_ns, bool waited)
>  {
>         if (waited)
> -               vcpu->stat.halt_poll_fail_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_fail_ns += poll_ns;
>         else
> -               vcpu->stat.halt_poll_success_ns += poll_ns;
> +               vcpu->stat.common.halt_poll_success_ns += poll_ns;
>  }
>
>  /*
> @@ -2960,16 +2960,16 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu)
>         if (vcpu->halt_poll_ns && !kvm_arch_no_poll(vcpu)) {
>                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
>
> -               ++vcpu->stat.halt_attempted_poll;
> +               ++vcpu->stat.common.halt_attempted_poll;
>                 do {
>                         /*
>                          * This sets KVM_REQ_UNHALT if an interrupt
>                          * arrives.
>                          */
>                         if (kvm_vcpu_check_block(vcpu) < 0) {
> -                               ++vcpu->stat.halt_successful_poll;
> +                               ++vcpu->stat.common.halt_successful_poll;
>                                 if (!vcpu_valid_wakeup(vcpu))
> -                                       ++vcpu->stat.halt_poll_invalid;
> +                                       ++vcpu->stat.common.halt_poll_invalid;
>                                 goto out;
>                         }
>                         poll_end = cur = ktime_get();
> @@ -3027,7 +3027,7 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
>         waitp = kvm_arch_vcpu_get_wait(vcpu);
>         if (rcuwait_wake_up(waitp)) {
>                 WRITE_ONCE(vcpu->ready, true);
> -               ++vcpu->stat.halt_wakeup;
> +               ++vcpu->stat.common.halt_wakeup;
>                 return true;
>         }
>
> --
> 2.31.1.751.gd2f1c929bd-goog
>
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