KVM: stats: Remove debugfs interface for KVM stats

To avoid duplication, remove the debugfs interface for KVM stats,
since the fd-based binary stats interface is available.

Signed-off-by: Jing Zhang <jingzhangos@google.com>
---
 arch/arm64/kvm/guest.c    |  16 ---
 arch/mips/kvm/mips.c      |  39 ------
 arch/powerpc/kvm/book3s.c |  33 -----
 arch/powerpc/kvm/booke.c  |  25 ----
 arch/s390/kvm/kvm-s390.c  | 108 ----------------
 arch/x86/kvm/x86.c        |  47 -------
 include/linux/kvm_host.h  |  34 +----
 virt/kvm/kvm_main.c       | 258 --------------------------------------
 8 files changed, 1 insertion(+), 559 deletions(-)

Hi Paolo,

On Fri, Jun 11, 2021 at 10:00 AM Jing Zhang <jingzhangos@google.com> wrote:
>
> To avoid duplication, remove the debugfs interface for KVM stats,
> since the fd-based binary stats interface is available.
>
> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>  arch/arm64/kvm/guest.c    |  16 ---
>  arch/mips/kvm/mips.c      |  39 ------
>  arch/powerpc/kvm/book3s.c |  33 -----
>  arch/powerpc/kvm/booke.c  |  25 ----
>  arch/s390/kvm/kvm-s390.c  | 108 ----------------
>  arch/x86/kvm/x86.c        |  47 -------
>  include/linux/kvm_host.h  |  34 +----
>  virt/kvm/kvm_main.c       | 258 --------------------------------------
>  8 files changed, 1 insertion(+), 559 deletions(-)
>
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 7048603f4b26..ab5b878b8b14 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -62,22 +62,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>         }
>  };
>
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT_GENERIC("halt_wakeup", 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_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -       { NULL }
> -};
> -
>  static bool core_reg_offset_is_vreg(u64 off)
>  {
>         return off >= KVM_REG_ARM_CORE_REG(fp_regs.vregs) &&
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 8fc70539a83b..285f009f02d1 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -97,45 +97,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>         }
>  };
>
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("wait", wait_exits),
> -       VCPU_STAT("cache", cache_exits),
> -       VCPU_STAT("signal", signal_exits),
> -       VCPU_STAT("interrupt", int_exits),
> -       VCPU_STAT("cop_unusable", cop_unusable_exits),
> -       VCPU_STAT("tlbmod", tlbmod_exits),
> -       VCPU_STAT("tlbmiss_ld", tlbmiss_ld_exits),
> -       VCPU_STAT("tlbmiss_st", tlbmiss_st_exits),
> -       VCPU_STAT("addrerr_st", addrerr_st_exits),
> -       VCPU_STAT("addrerr_ld", addrerr_ld_exits),
> -       VCPU_STAT("syscall", syscall_exits),
> -       VCPU_STAT("resvd_inst", resvd_inst_exits),
> -       VCPU_STAT("break_inst", break_inst_exits),
> -       VCPU_STAT("trap_inst", trap_inst_exits),
> -       VCPU_STAT("msa_fpe", msa_fpe_exits),
> -       VCPU_STAT("fpe", fpe_exits),
> -       VCPU_STAT("msa_disabled", msa_disabled_exits),
> -       VCPU_STAT("flush_dcache", flush_dcache_exits),
> -       VCPU_STAT("vz_gpsi", vz_gpsi_exits),
> -       VCPU_STAT("vz_gsfc", vz_gsfc_exits),
> -       VCPU_STAT("vz_hc", vz_hc_exits),
> -       VCPU_STAT("vz_grr", vz_grr_exits),
> -       VCPU_STAT("vz_gva", vz_gva_exits),
> -       VCPU_STAT("vz_ghfc", vz_ghfc_exits),
> -       VCPU_STAT("vz_gpa", vz_gpa_exits),
> -       VCPU_STAT("vz_resvd", vz_resvd_exits),
> -#ifdef CONFIG_CPU_LOONGSON64
> -       VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> -#endif
> -       VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -       VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -       {NULL}
> -};
> -
>  bool kvm_trace_guest_mode_change;
>
>  int kvm_guest_mode_change_trace_reg(void)
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index eff5a96aa638..f0fd9d1d5ee0 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -98,39 +98,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>         }
>  };
>
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("exits", sum_exits),
> -       VCPU_STAT("mmio", mmio_exits),
> -       VCPU_STAT("sig", signal_exits),
> -       VCPU_STAT("sysc", syscall_exits),
> -       VCPU_STAT("inst_emu", emulated_inst_exits),
> -       VCPU_STAT("dec", dec_exits),
> -       VCPU_STAT("ext_intr", ext_intr_exits),
> -       VCPU_STAT("queue_intr", queue_intr),
> -       VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -       VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -       VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -       VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("pf_storage", pf_storage),
> -       VCPU_STAT("sp_storage", sp_storage),
> -       VCPU_STAT("pf_instruc", pf_instruc),
> -       VCPU_STAT("sp_instruc", sp_instruc),
> -       VCPU_STAT("ld", ld),
> -       VCPU_STAT("ld_slow", ld_slow),
> -       VCPU_STAT("st", st),
> -       VCPU_STAT("st_slow", st_slow),
> -       VCPU_STAT("pthru_all", pthru_all),
> -       VCPU_STAT("pthru_host", pthru_host),
> -       VCPU_STAT("pthru_bad_aff", pthru_bad_aff),
> -       VM_STAT("largepages_2M", num_2M_pages, .mode = 0444),
> -       VM_STAT("largepages_1G", num_1G_pages, .mode = 0444),
> -       { NULL }
> -};
> -
>  static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu,
>                         unsigned long pending_now, unsigned long old_pending)
>  {
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 5b0c4dff4f10..890ec72cd327 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -89,31 +89,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>         }
>  };
>
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("mmio", mmio_exits),
> -       VCPU_STAT("sig", signal_exits),
> -       VCPU_STAT("itlb_r", itlb_real_miss_exits),
> -       VCPU_STAT("itlb_v", itlb_virt_miss_exits),
> -       VCPU_STAT("dtlb_r", dtlb_real_miss_exits),
> -       VCPU_STAT("dtlb_v", dtlb_virt_miss_exits),
> -       VCPU_STAT("sysc", syscall_exits),
> -       VCPU_STAT("isi", isi_exits),
> -       VCPU_STAT("dsi", dsi_exits),
> -       VCPU_STAT("inst_emu", emulated_inst_exits),
> -       VCPU_STAT("dec", dec_exits),
> -       VCPU_STAT("ext_intr", ext_intr_exits),
> -       VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("doorbell", dbell_exits),
> -       VCPU_STAT("guest doorbell", gdbell_exits),
> -       VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -       VM_STAT_GENERIC("remote_tlb_flush", remote_tlb_flush),
> -       { NULL }
> -};
> -
>  /* TODO: use vcpu_printf() */
>  void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
>  {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 522a6ac2e347..75d6d499c455 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -183,114 +183,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>         }
>  };
>
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("userspace_handled", exit_userspace),
> -       VCPU_STAT("exit_null", exit_null),
> -       VCPU_STAT("pfault_sync", pfault_sync),
> -       VCPU_STAT("exit_validity", exit_validity),
> -       VCPU_STAT("exit_stop_request", exit_stop_request),
> -       VCPU_STAT("exit_external_request", exit_external_request),
> -       VCPU_STAT("exit_io_request", exit_io_request),
> -       VCPU_STAT("exit_external_interrupt", exit_external_interrupt),
> -       VCPU_STAT("exit_instruction", exit_instruction),
> -       VCPU_STAT("exit_pei", exit_pei),
> -       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_GENERIC("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -       VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -       VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT_GENERIC("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),
> -       VCPU_STAT("instruction_stctg", instruction_stctg),
> -       VCPU_STAT("deliver_ckc", deliver_ckc),
> -       VCPU_STAT("deliver_cputm", deliver_cputm),
> -       VCPU_STAT("deliver_emergency_signal", deliver_emergency_signal),
> -       VCPU_STAT("deliver_external_call", deliver_external_call),
> -       VCPU_STAT("deliver_service_signal", deliver_service_signal),
> -       VCPU_STAT("deliver_virtio", deliver_virtio),
> -       VCPU_STAT("deliver_stop_signal", deliver_stop_signal),
> -       VCPU_STAT("deliver_prefix_signal", deliver_prefix_signal),
> -       VCPU_STAT("deliver_restart_signal", deliver_restart_signal),
> -       VCPU_STAT("deliver_program", deliver_program),
> -       VCPU_STAT("deliver_io", deliver_io),
> -       VCPU_STAT("deliver_machine_check", deliver_machine_check),
> -       VCPU_STAT("exit_wait_state", exit_wait_state),
> -       VCPU_STAT("inject_ckc", inject_ckc),
> -       VCPU_STAT("inject_cputm", inject_cputm),
> -       VCPU_STAT("inject_external_call", inject_external_call),
> -       VM_STAT("inject_float_mchk", inject_float_mchk),
> -       VCPU_STAT("inject_emergency_signal", inject_emergency_signal),
> -       VM_STAT("inject_io", inject_io),
> -       VCPU_STAT("inject_mchk", inject_mchk),
> -       VM_STAT("inject_pfault_done", inject_pfault_done),
> -       VCPU_STAT("inject_program", inject_program),
> -       VCPU_STAT("inject_restart", inject_restart),
> -       VM_STAT("inject_service_signal", inject_service_signal),
> -       VCPU_STAT("inject_set_prefix", inject_set_prefix),
> -       VCPU_STAT("inject_stop_signal", inject_stop_signal),
> -       VCPU_STAT("inject_pfault_init", inject_pfault_init),
> -       VM_STAT("inject_virtio", inject_virtio),
> -       VCPU_STAT("instruction_epsw", instruction_epsw),
> -       VCPU_STAT("instruction_gs", instruction_gs),
> -       VCPU_STAT("instruction_io_other", instruction_io_other),
> -       VCPU_STAT("instruction_lpsw", instruction_lpsw),
> -       VCPU_STAT("instruction_lpswe", instruction_lpswe),
> -       VCPU_STAT("instruction_pfmf", instruction_pfmf),
> -       VCPU_STAT("instruction_ptff", instruction_ptff),
> -       VCPU_STAT("instruction_stidp", instruction_stidp),
> -       VCPU_STAT("instruction_sck", instruction_sck),
> -       VCPU_STAT("instruction_sckpf", instruction_sckpf),
> -       VCPU_STAT("instruction_spx", instruction_spx),
> -       VCPU_STAT("instruction_stpx", instruction_stpx),
> -       VCPU_STAT("instruction_stap", instruction_stap),
> -       VCPU_STAT("instruction_iske", instruction_iske),
> -       VCPU_STAT("instruction_ri", instruction_ri),
> -       VCPU_STAT("instruction_rrbe", instruction_rrbe),
> -       VCPU_STAT("instruction_sske", instruction_sske),
> -       VCPU_STAT("instruction_ipte_interlock", instruction_ipte_interlock),
> -       VCPU_STAT("instruction_essa", instruction_essa),
> -       VCPU_STAT("instruction_stsi", instruction_stsi),
> -       VCPU_STAT("instruction_stfl", instruction_stfl),
> -       VCPU_STAT("instruction_tb", instruction_tb),
> -       VCPU_STAT("instruction_tpi", instruction_tpi),
> -       VCPU_STAT("instruction_tprot", instruction_tprot),
> -       VCPU_STAT("instruction_tsch", instruction_tsch),
> -       VCPU_STAT("instruction_sthyi", instruction_sthyi),
> -       VCPU_STAT("instruction_sie", instruction_sie),
> -       VCPU_STAT("instruction_sigp_sense", instruction_sigp_sense),
> -       VCPU_STAT("instruction_sigp_sense_running", instruction_sigp_sense_running),
> -       VCPU_STAT("instruction_sigp_external_call", instruction_sigp_external_call),
> -       VCPU_STAT("instruction_sigp_emergency", instruction_sigp_emergency),
> -       VCPU_STAT("instruction_sigp_cond_emergency", instruction_sigp_cond_emergency),
> -       VCPU_STAT("instruction_sigp_start", instruction_sigp_start),
> -       VCPU_STAT("instruction_sigp_stop", instruction_sigp_stop),
> -       VCPU_STAT("instruction_sigp_stop_store_status", instruction_sigp_stop_store_status),
> -       VCPU_STAT("instruction_sigp_store_status", instruction_sigp_store_status),
> -       VCPU_STAT("instruction_sigp_store_adtl_status", instruction_sigp_store_adtl_status),
> -       VCPU_STAT("instruction_sigp_set_arch", instruction_sigp_arch),
> -       VCPU_STAT("instruction_sigp_set_prefix", instruction_sigp_prefix),
> -       VCPU_STAT("instruction_sigp_restart", instruction_sigp_restart),
> -       VCPU_STAT("instruction_sigp_cpu_reset", instruction_sigp_cpu_reset),
> -       VCPU_STAT("instruction_sigp_init_cpu_reset", instruction_sigp_init_cpu_reset),
> -       VCPU_STAT("instruction_sigp_unknown", instruction_sigp_unknown),
> -       VCPU_STAT("instruction_diag_10", diagnose_10),
> -       VCPU_STAT("instruction_diag_44", diagnose_44),
> -       VCPU_STAT("instruction_diag_9c", diagnose_9c),
> -       VCPU_STAT("diag_9c_ignored", diagnose_9c_ignored),
> -       VCPU_STAT("diag_9c_forward", diagnose_9c_forward),
> -       VCPU_STAT("instruction_diag_258", diagnose_258),
> -       VCPU_STAT("instruction_diag_308", diagnose_308),
> -       VCPU_STAT("instruction_diag_500", diagnose_500),
> -       VCPU_STAT("instruction_diag_other", diagnose_other),
> -       { NULL }
> -};
> -
>  /* allow nested virtualization in KVM (if enabled by user space) */
>  static int nested;
>  module_param(nested, int, S_IRUGO);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index abc5cc8293b3..d24055fcdc0b 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -282,53 +282,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>         }
>  };
>
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -       VCPU_STAT("pf_fixed", pf_fixed),
> -       VCPU_STAT("pf_guest", pf_guest),
> -       VCPU_STAT("tlb_flush", tlb_flush),
> -       VCPU_STAT("invlpg", invlpg),
> -       VCPU_STAT("exits", exits),
> -       VCPU_STAT("io_exits", io_exits),
> -       VCPU_STAT("mmio_exits", mmio_exits),
> -       VCPU_STAT("signal_exits", signal_exits),
> -       VCPU_STAT("irq_window", irq_window_exits),
> -       VCPU_STAT("nmi_window", nmi_window_exits),
> -       VCPU_STAT("halt_exits", halt_exits),
> -       VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -       VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -       VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -       VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -       VCPU_STAT("hypercalls", hypercalls),
> -       VCPU_STAT("request_irq", request_irq_exits),
> -       VCPU_STAT("irq_exits", irq_exits),
> -       VCPU_STAT("host_state_reload", host_state_reload),
> -       VCPU_STAT("fpu_reload", fpu_reload),
> -       VCPU_STAT("insn_emulation", insn_emulation),
> -       VCPU_STAT("insn_emulation_fail", insn_emulation_fail),
> -       VCPU_STAT("irq_injections", irq_injections),
> -       VCPU_STAT("nmi_injections", nmi_injections),
> -       VCPU_STAT("req_event", req_event),
> -       VCPU_STAT("l1d_flush", l1d_flush),
> -       VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -       VCPU_STAT_GENERIC("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),
> -       VCPU_STAT("guest_mode", guest_mode),
> -       VM_STAT("mmu_shadow_zapped", mmu_shadow_zapped),
> -       VM_STAT("mmu_pte_write", mmu_pte_write),
> -       VM_STAT("mmu_pde_zapped", mmu_pde_zapped),
> -       VM_STAT("mmu_flooded", mmu_flooded),
> -       VM_STAT("mmu_recycled", mmu_recycled),
> -       VM_STAT("mmu_cache_miss", mmu_cache_miss),
> -       VM_STAT("mmu_unsync", mmu_unsync),
> -       VM_STAT_GENERIC("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),
> -       { NULL }
> -};
> -
>  u64 __read_mostly host_xcr0;
>  u64 __read_mostly supported_xcr0;
>  EXPORT_SYMBOL_GPL(supported_xcr0);
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 5e77f32abef5..60ddb64a134e 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -589,7 +589,6 @@ struct kvm {
>         struct list_head devices;
>         u64 manual_dirty_log_protect;
>         struct dentry *debugfs_dentry;
> -       struct kvm_stat_data **debugfs_stat_data;
>         struct srcu_struct srcu;
>         struct srcu_struct irq_srcu;
>         pid_t userspace_pid;
> @@ -1255,23 +1254,6 @@ static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
>         return kvm_is_error_hva(hva);
>  }
>
> -enum kvm_stat_kind {
> -       KVM_STAT_VM,
> -       KVM_STAT_VCPU,
> -};
> -
> -struct kvm_stat_data {
> -       struct kvm *kvm;
> -       struct kvm_stats_debugfs_item *dbgfs_item;
> -};
> -
> -struct kvm_stats_debugfs_item {
> -       const char *name;
> -       int offset;
> -       enum kvm_stat_kind kind;
> -       int mode;
> -};
> -
>  struct _kvm_stats_header {
>         struct kvm_stats_header header;
>         char id[KVM_STATS_ID_MAXLEN];
> @@ -1283,20 +1265,7 @@ struct _kvm_stats_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, ...)                                                    \
> -       { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)                                                  \
> -       { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> -#define VM_STAT_GENERIC(n, x, ...)                                            \
> -       { n, offsetof(struct kvm, stat.generic.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT_GENERIC(n, x, ...)                                          \
> -       { n, offsetof(struct kvm_vcpu, stat.generic.x),                        \
> -         KVM_STAT_VCPU, ## __VA_ARGS__ }
> -
> -#define STATS_DESC(stat, type, unit, base, exp)                               \
> +#define STATS_DESC(stat, type, unit, base, exp)                                       \
>         {                                                                      \
>                 {                                                              \
>                         .flags = type | unit | base |                          \
> @@ -1410,7 +1379,6 @@ struct _kvm_stats_desc {
>         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;
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index f5bea71ea61c..f2da1d94057d 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -115,9 +115,6 @@ static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu);
>  struct dentry *kvm_debugfs_dir;
>  EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
>
> -static int kvm_debugfs_num_entries;
> -static const struct file_operations stat_fops_per_vm;
> -
>  static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
>                            unsigned long arg);
>  #ifdef CONFIG_KVM_COMPAT
> @@ -862,25 +859,15 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
>
>  static void kvm_destroy_vm_debugfs(struct kvm *kvm)
>  {
> -       int i;
> -
>         if (!kvm->debugfs_dentry)
>                 return;
>
>         debugfs_remove_recursive(kvm->debugfs_dentry);
> -
> -       if (kvm->debugfs_stat_data) {
> -               for (i = 0; i < kvm_debugfs_num_entries; i++)
> -                       kfree(kvm->debugfs_stat_data[i]);
> -               kfree(kvm->debugfs_stat_data);
> -       }
>  }
>
>  static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
>  {
>         char dir_name[ITOA_MAX_LEN * 2];
> -       struct kvm_stat_data *stat_data;
> -       struct kvm_stats_debugfs_item *p;
>
>         if (!debugfs_initialized())
>                 return 0;
> @@ -888,24 +875,6 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
>         snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
>         kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
>
> -       kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
> -                                        sizeof(*kvm->debugfs_stat_data),
> -                                        GFP_KERNEL_ACCOUNT);
> -       if (!kvm->debugfs_stat_data)
> -               return -ENOMEM;
> -
> -       for (p = debugfs_entries; p->name; p++) {
> -               stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT);
> -               if (!stat_data)
> -                       return -ENOMEM;
> -
> -               stat_data->kvm = kvm;
> -               stat_data->dbgfs_item = p;
> -               kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
> -               debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p),
> -                                   kvm->debugfs_dentry, stat_data,
> -                                   &stat_fops_per_vm);
> -       }
>         return 0;
>  }
>
> @@ -4937,214 +4906,6 @@ struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
>  }
>  EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
>
> -static int kvm_debugfs_open(struct inode *inode, struct file *file,
> -                          int (*get)(void *, u64 *), int (*set)(void *, u64),
> -                          const char *fmt)
> -{
> -       struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
> -                                         inode->i_private;
> -
> -       /* The debugfs files are a reference to the kvm struct which
> -        * is still valid when kvm_destroy_vm is called.
> -        * To avoid the race between open and the removal of the debugfs
> -        * directory we test against the users count.
> -        */
> -       if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
> -               return -ENOENT;
> -
> -       if (simple_attr_open(inode, file, get,
> -                   KVM_DBGFS_GET_MODE(stat_data->dbgfs_item) & 0222
> -                   ? set : NULL,
> -                   fmt)) {
> -               kvm_put_kvm(stat_data->kvm);
> -               return -ENOMEM;
> -       }
> -
> -       return 0;
> -}
> -
> -static int kvm_debugfs_release(struct inode *inode, struct file *file)
> -{
> -       struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
> -                                         inode->i_private;
> -
> -       simple_attr_release(inode, file);
> -       kvm_put_kvm(stat_data->kvm);
> -
> -       return 0;
> -}
> -
> -static int kvm_get_stat_per_vm(struct kvm *kvm, size_t offset, u64 *val)
> -{
> -       *val = *(u64 *)((void *)kvm + offset);
> -
> -       return 0;
> -}
> -
> -static int kvm_clear_stat_per_vm(struct kvm *kvm, size_t offset)
> -{
> -       *(u64 *)((void *)kvm + offset) = 0;
> -
> -       return 0;
> -}
> -
> -static int kvm_get_stat_per_vcpu(struct kvm *kvm, size_t offset, u64 *val)
> -{
> -       int i;
> -       struct kvm_vcpu *vcpu;
> -
> -       *val = 0;
> -
> -       kvm_for_each_vcpu(i, vcpu, kvm)
> -               *val += *(u64 *)((void *)vcpu + offset);
> -
> -       return 0;
> -}
> -
> -static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset)
> -{
> -       int i;
> -       struct kvm_vcpu *vcpu;
> -
> -       kvm_for_each_vcpu(i, vcpu, kvm)
> -               *(u64 *)((void *)vcpu + offset) = 0;
> -
> -       return 0;
> -}
> -
> -static int kvm_stat_data_get(void *data, u64 *val)
> -{
> -       int r = -EFAULT;
> -       struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
> -
> -       switch (stat_data->dbgfs_item->kind) {
> -       case KVM_STAT_VM:
> -               r = kvm_get_stat_per_vm(stat_data->kvm,
> -                                       stat_data->dbgfs_item->offset, val);
> -               break;
> -       case KVM_STAT_VCPU:
> -               r = kvm_get_stat_per_vcpu(stat_data->kvm,
> -                                         stat_data->dbgfs_item->offset, val);
> -               break;
> -       }
> -
> -       return r;
> -}
> -
> -static int kvm_stat_data_clear(void *data, u64 val)
> -{
> -       int r = -EFAULT;
> -       struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
> -
> -       if (val)
> -               return -EINVAL;
> -
> -       switch (stat_data->dbgfs_item->kind) {
> -       case KVM_STAT_VM:
> -               r = kvm_clear_stat_per_vm(stat_data->kvm,
> -                                         stat_data->dbgfs_item->offset);
> -               break;
> -       case KVM_STAT_VCPU:
> -               r = kvm_clear_stat_per_vcpu(stat_data->kvm,
> -                                           stat_data->dbgfs_item->offset);
> -               break;
> -       }
> -
> -       return r;
> -}
> -
> -static int kvm_stat_data_open(struct inode *inode, struct file *file)
> -{
> -       __simple_attr_check_format("%llu\n", 0ull);
> -       return kvm_debugfs_open(inode, file, kvm_stat_data_get,
> -                               kvm_stat_data_clear, "%llu\n");
> -}
> -
> -static const struct file_operations stat_fops_per_vm = {
> -       .owner = THIS_MODULE,
> -       .open = kvm_stat_data_open,
> -       .release = kvm_debugfs_release,
> -       .read = simple_attr_read,
> -       .write = simple_attr_write,
> -       .llseek = no_llseek,
> -};
> -
> -static int vm_stat_get(void *_offset, u64 *val)
> -{
> -       unsigned offset = (long)_offset;
> -       struct kvm *kvm;
> -       u64 tmp_val;
> -
> -       *val = 0;
> -       mutex_lock(&kvm_lock);
> -       list_for_each_entry(kvm, &vm_list, vm_list) {
> -               kvm_get_stat_per_vm(kvm, offset, &tmp_val);
> -               *val += tmp_val;
> -       }
> -       mutex_unlock(&kvm_lock);
> -       return 0;
> -}
> -
> -static int vm_stat_clear(void *_offset, u64 val)
> -{
> -       unsigned offset = (long)_offset;
> -       struct kvm *kvm;
> -
> -       if (val)
> -               return -EINVAL;
> -
> -       mutex_lock(&kvm_lock);
> -       list_for_each_entry(kvm, &vm_list, vm_list) {
> -               kvm_clear_stat_per_vm(kvm, offset);
> -       }
> -       mutex_unlock(&kvm_lock);
> -
> -       return 0;
> -}
> -
> -DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
> -
> -static int vcpu_stat_get(void *_offset, u64 *val)
> -{
> -       unsigned offset = (long)_offset;
> -       struct kvm *kvm;
> -       u64 tmp_val;
> -
> -       *val = 0;
> -       mutex_lock(&kvm_lock);
> -       list_for_each_entry(kvm, &vm_list, vm_list) {
> -               kvm_get_stat_per_vcpu(kvm, offset, &tmp_val);
> -               *val += tmp_val;
> -       }
> -       mutex_unlock(&kvm_lock);
> -       return 0;
> -}
> -
> -static int vcpu_stat_clear(void *_offset, u64 val)
> -{
> -       unsigned offset = (long)_offset;
> -       struct kvm *kvm;
> -
> -       if (val)
> -               return -EINVAL;
> -
> -       mutex_lock(&kvm_lock);
> -       list_for_each_entry(kvm, &vm_list, vm_list) {
> -               kvm_clear_stat_per_vcpu(kvm, offset);
> -       }
> -       mutex_unlock(&kvm_lock);
> -
> -       return 0;
> -}
> -
> -DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
> -                       "%llu\n");
> -
> -static const struct file_operations *stat_fops[] = {
> -       [KVM_STAT_VCPU] = &vcpu_stat_fops,
> -       [KVM_STAT_VM]   = &vm_stat_fops,
> -};
> -
>  static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
>  {
>         struct kobj_uevent_env *env;
> @@ -5179,16 +4940,6 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
>         }
>         add_uevent_var(env, "PID=%d", kvm->userspace_pid);
>
> -       if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) {
> -               char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT);
> -
> -               if (p) {
> -                       tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
> -                       if (!IS_ERR(tmp))
> -                               add_uevent_var(env, "STATS_PATH=%s", tmp);
> -                       kfree(p);
> -               }
> -       }
>         /* no need for checks, since we are adding at most only 5 keys */
>         env->envp[env->envp_idx++] = NULL;
>         kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
> @@ -5197,16 +4948,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
>
>  static void kvm_init_debug(void)
>  {
> -       struct kvm_stats_debugfs_item *p;
> -
>         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
> -
> -       kvm_debugfs_num_entries = 0;
> -       for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
> -               debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p),
> -                                   kvm_debugfs_dir, (void *)(long)p->offset,
> -                                   stat_fops[p->kind]);
> -       }
>  }
>
>  static int kvm_suspend(void)
> --
> 2.32.0.272.g935e593368-goog
>
This is the follow-up patch to remove stats debugfs interface based on
https://lore.kernel.org/kvm/20210611124624.1404010-1-jingzhangos@google.com

Thanks,
Jing

On 11/06/21 17:00, Jing Zhang wrote:
> To avoid duplication, remove the debugfs interface for KVM stats,
> since the fd-based binary stats interface is available.

That would be too easy. :)  We need to keep the debugfs code because it 
is not yet a 100% replacement for binary stats (it allows to inspect all 
running guests without collaboration from the VMM); however we can make 
it work on the binary stats descriptors instead of using struct 
kvm_stats_debugfs_item.  This way you can remove the duplication between 
the stats descriptors and the VCPU_STAT/VM_STAT entries.

Thanks,

Paolo

> Signed-off-by: Jing Zhang <jingzhangos@google.com>
> ---
>   arch/arm64/kvm/guest.c    |  16 ---
>   arch/mips/kvm/mips.c      |  39 ------
>   arch/powerpc/kvm/book3s.c |  33 -----
>   arch/powerpc/kvm/booke.c  |  25 ----
>   arch/s390/kvm/kvm-s390.c  | 108 ----------------
>   arch/x86/kvm/x86.c        |  47 -------
>   include/linux/kvm_host.h  |  34 +----
>   virt/kvm/kvm_main.c       | 258 --------------------------------------
>   8 files changed, 1 insertion(+), 559 deletions(-)
> 
> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> index 7048603f4b26..ab5b878b8b14 100644
> --- a/arch/arm64/kvm/guest.c
> +++ b/arch/arm64/kvm/guest.c
> @@ -62,22 +62,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>   	}
>   };
>   
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT_GENERIC("halt_wakeup", 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_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -	{ NULL }
> -};
> -
>   static bool core_reg_offset_is_vreg(u64 off)
>   {
>   	return off >= KVM_REG_ARM_CORE_REG(fp_regs.vregs) &&
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 8fc70539a83b..285f009f02d1 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -97,45 +97,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>   	}
>   };
>   
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("wait", wait_exits),
> -	VCPU_STAT("cache", cache_exits),
> -	VCPU_STAT("signal", signal_exits),
> -	VCPU_STAT("interrupt", int_exits),
> -	VCPU_STAT("cop_unusable", cop_unusable_exits),
> -	VCPU_STAT("tlbmod", tlbmod_exits),
> -	VCPU_STAT("tlbmiss_ld", tlbmiss_ld_exits),
> -	VCPU_STAT("tlbmiss_st", tlbmiss_st_exits),
> -	VCPU_STAT("addrerr_st", addrerr_st_exits),
> -	VCPU_STAT("addrerr_ld", addrerr_ld_exits),
> -	VCPU_STAT("syscall", syscall_exits),
> -	VCPU_STAT("resvd_inst", resvd_inst_exits),
> -	VCPU_STAT("break_inst", break_inst_exits),
> -	VCPU_STAT("trap_inst", trap_inst_exits),
> -	VCPU_STAT("msa_fpe", msa_fpe_exits),
> -	VCPU_STAT("fpe", fpe_exits),
> -	VCPU_STAT("msa_disabled", msa_disabled_exits),
> -	VCPU_STAT("flush_dcache", flush_dcache_exits),
> -	VCPU_STAT("vz_gpsi", vz_gpsi_exits),
> -	VCPU_STAT("vz_gsfc", vz_gsfc_exits),
> -	VCPU_STAT("vz_hc", vz_hc_exits),
> -	VCPU_STAT("vz_grr", vz_grr_exits),
> -	VCPU_STAT("vz_gva", vz_gva_exits),
> -	VCPU_STAT("vz_ghfc", vz_ghfc_exits),
> -	VCPU_STAT("vz_gpa", vz_gpa_exits),
> -	VCPU_STAT("vz_resvd", vz_resvd_exits),
> -#ifdef CONFIG_CPU_LOONGSON64
> -	VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> -#endif
> -	VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -	VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -	{NULL}
> -};
> -
>   bool kvm_trace_guest_mode_change;
>   
>   int kvm_guest_mode_change_trace_reg(void)
> diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> index eff5a96aa638..f0fd9d1d5ee0 100644
> --- a/arch/powerpc/kvm/book3s.c
> +++ b/arch/powerpc/kvm/book3s.c
> @@ -98,39 +98,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>   	}
>   };
>   
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("exits", sum_exits),
> -	VCPU_STAT("mmio", mmio_exits),
> -	VCPU_STAT("sig", signal_exits),
> -	VCPU_STAT("sysc", syscall_exits),
> -	VCPU_STAT("inst_emu", emulated_inst_exits),
> -	VCPU_STAT("dec", dec_exits),
> -	VCPU_STAT("ext_intr", ext_intr_exits),
> -	VCPU_STAT("queue_intr", queue_intr),
> -	VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -	VCPU_STAT("halt_wait_ns", halt_wait_ns),
> -	VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT("halt_successful_wait", halt_successful_wait),
> -	VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("pf_storage", pf_storage),
> -	VCPU_STAT("sp_storage", sp_storage),
> -	VCPU_STAT("pf_instruc", pf_instruc),
> -	VCPU_STAT("sp_instruc", sp_instruc),
> -	VCPU_STAT("ld", ld),
> -	VCPU_STAT("ld_slow", ld_slow),
> -	VCPU_STAT("st", st),
> -	VCPU_STAT("st_slow", st_slow),
> -	VCPU_STAT("pthru_all", pthru_all),
> -	VCPU_STAT("pthru_host", pthru_host),
> -	VCPU_STAT("pthru_bad_aff", pthru_bad_aff),
> -	VM_STAT("largepages_2M", num_2M_pages, .mode = 0444),
> -	VM_STAT("largepages_1G", num_1G_pages, .mode = 0444),
> -	{ NULL }
> -};
> -
>   static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu,
>   			unsigned long pending_now, unsigned long old_pending)
>   {
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index 5b0c4dff4f10..890ec72cd327 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -89,31 +89,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>   	}
>   };
>   
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("mmio", mmio_exits),
> -	VCPU_STAT("sig", signal_exits),
> -	VCPU_STAT("itlb_r", itlb_real_miss_exits),
> -	VCPU_STAT("itlb_v", itlb_virt_miss_exits),
> -	VCPU_STAT("dtlb_r", dtlb_real_miss_exits),
> -	VCPU_STAT("dtlb_v", dtlb_virt_miss_exits),
> -	VCPU_STAT("sysc", syscall_exits),
> -	VCPU_STAT("isi", isi_exits),
> -	VCPU_STAT("dsi", dsi_exits),
> -	VCPU_STAT("inst_emu", emulated_inst_exits),
> -	VCPU_STAT("dec", dec_exits),
> -	VCPU_STAT("ext_intr", ext_intr_exits),
> -	VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("doorbell", dbell_exits),
> -	VCPU_STAT("guest doorbell", gdbell_exits),
> -	VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> -	VM_STAT_GENERIC("remote_tlb_flush", remote_tlb_flush),
> -	{ NULL }
> -};
> -
>   /* TODO: use vcpu_printf() */
>   void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
>   {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 522a6ac2e347..75d6d499c455 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -183,114 +183,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>   	}
>   };
>   
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("userspace_handled", exit_userspace),
> -	VCPU_STAT("exit_null", exit_null),
> -	VCPU_STAT("pfault_sync", pfault_sync),
> -	VCPU_STAT("exit_validity", exit_validity),
> -	VCPU_STAT("exit_stop_request", exit_stop_request),
> -	VCPU_STAT("exit_external_request", exit_external_request),
> -	VCPU_STAT("exit_io_request", exit_io_request),
> -	VCPU_STAT("exit_external_interrupt", exit_external_interrupt),
> -	VCPU_STAT("exit_instruction", exit_instruction),
> -	VCPU_STAT("exit_pei", exit_pei),
> -	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_GENERIC("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> -	VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -	VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT_GENERIC("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),
> -	VCPU_STAT("instruction_stctg", instruction_stctg),
> -	VCPU_STAT("deliver_ckc", deliver_ckc),
> -	VCPU_STAT("deliver_cputm", deliver_cputm),
> -	VCPU_STAT("deliver_emergency_signal", deliver_emergency_signal),
> -	VCPU_STAT("deliver_external_call", deliver_external_call),
> -	VCPU_STAT("deliver_service_signal", deliver_service_signal),
> -	VCPU_STAT("deliver_virtio", deliver_virtio),
> -	VCPU_STAT("deliver_stop_signal", deliver_stop_signal),
> -	VCPU_STAT("deliver_prefix_signal", deliver_prefix_signal),
> -	VCPU_STAT("deliver_restart_signal", deliver_restart_signal),
> -	VCPU_STAT("deliver_program", deliver_program),
> -	VCPU_STAT("deliver_io", deliver_io),
> -	VCPU_STAT("deliver_machine_check", deliver_machine_check),
> -	VCPU_STAT("exit_wait_state", exit_wait_state),
> -	VCPU_STAT("inject_ckc", inject_ckc),
> -	VCPU_STAT("inject_cputm", inject_cputm),
> -	VCPU_STAT("inject_external_call", inject_external_call),
> -	VM_STAT("inject_float_mchk", inject_float_mchk),
> -	VCPU_STAT("inject_emergency_signal", inject_emergency_signal),
> -	VM_STAT("inject_io", inject_io),
> -	VCPU_STAT("inject_mchk", inject_mchk),
> -	VM_STAT("inject_pfault_done", inject_pfault_done),
> -	VCPU_STAT("inject_program", inject_program),
> -	VCPU_STAT("inject_restart", inject_restart),
> -	VM_STAT("inject_service_signal", inject_service_signal),
> -	VCPU_STAT("inject_set_prefix", inject_set_prefix),
> -	VCPU_STAT("inject_stop_signal", inject_stop_signal),
> -	VCPU_STAT("inject_pfault_init", inject_pfault_init),
> -	VM_STAT("inject_virtio", inject_virtio),
> -	VCPU_STAT("instruction_epsw", instruction_epsw),
> -	VCPU_STAT("instruction_gs", instruction_gs),
> -	VCPU_STAT("instruction_io_other", instruction_io_other),
> -	VCPU_STAT("instruction_lpsw", instruction_lpsw),
> -	VCPU_STAT("instruction_lpswe", instruction_lpswe),
> -	VCPU_STAT("instruction_pfmf", instruction_pfmf),
> -	VCPU_STAT("instruction_ptff", instruction_ptff),
> -	VCPU_STAT("instruction_stidp", instruction_stidp),
> -	VCPU_STAT("instruction_sck", instruction_sck),
> -	VCPU_STAT("instruction_sckpf", instruction_sckpf),
> -	VCPU_STAT("instruction_spx", instruction_spx),
> -	VCPU_STAT("instruction_stpx", instruction_stpx),
> -	VCPU_STAT("instruction_stap", instruction_stap),
> -	VCPU_STAT("instruction_iske", instruction_iske),
> -	VCPU_STAT("instruction_ri", instruction_ri),
> -	VCPU_STAT("instruction_rrbe", instruction_rrbe),
> -	VCPU_STAT("instruction_sske", instruction_sske),
> -	VCPU_STAT("instruction_ipte_interlock", instruction_ipte_interlock),
> -	VCPU_STAT("instruction_essa", instruction_essa),
> -	VCPU_STAT("instruction_stsi", instruction_stsi),
> -	VCPU_STAT("instruction_stfl", instruction_stfl),
> -	VCPU_STAT("instruction_tb", instruction_tb),
> -	VCPU_STAT("instruction_tpi", instruction_tpi),
> -	VCPU_STAT("instruction_tprot", instruction_tprot),
> -	VCPU_STAT("instruction_tsch", instruction_tsch),
> -	VCPU_STAT("instruction_sthyi", instruction_sthyi),
> -	VCPU_STAT("instruction_sie", instruction_sie),
> -	VCPU_STAT("instruction_sigp_sense", instruction_sigp_sense),
> -	VCPU_STAT("instruction_sigp_sense_running", instruction_sigp_sense_running),
> -	VCPU_STAT("instruction_sigp_external_call", instruction_sigp_external_call),
> -	VCPU_STAT("instruction_sigp_emergency", instruction_sigp_emergency),
> -	VCPU_STAT("instruction_sigp_cond_emergency", instruction_sigp_cond_emergency),
> -	VCPU_STAT("instruction_sigp_start", instruction_sigp_start),
> -	VCPU_STAT("instruction_sigp_stop", instruction_sigp_stop),
> -	VCPU_STAT("instruction_sigp_stop_store_status", instruction_sigp_stop_store_status),
> -	VCPU_STAT("instruction_sigp_store_status", instruction_sigp_store_status),
> -	VCPU_STAT("instruction_sigp_store_adtl_status", instruction_sigp_store_adtl_status),
> -	VCPU_STAT("instruction_sigp_set_arch", instruction_sigp_arch),
> -	VCPU_STAT("instruction_sigp_set_prefix", instruction_sigp_prefix),
> -	VCPU_STAT("instruction_sigp_restart", instruction_sigp_restart),
> -	VCPU_STAT("instruction_sigp_cpu_reset", instruction_sigp_cpu_reset),
> -	VCPU_STAT("instruction_sigp_init_cpu_reset", instruction_sigp_init_cpu_reset),
> -	VCPU_STAT("instruction_sigp_unknown", instruction_sigp_unknown),
> -	VCPU_STAT("instruction_diag_10", diagnose_10),
> -	VCPU_STAT("instruction_diag_44", diagnose_44),
> -	VCPU_STAT("instruction_diag_9c", diagnose_9c),
> -	VCPU_STAT("diag_9c_ignored", diagnose_9c_ignored),
> -	VCPU_STAT("diag_9c_forward", diagnose_9c_forward),
> -	VCPU_STAT("instruction_diag_258", diagnose_258),
> -	VCPU_STAT("instruction_diag_308", diagnose_308),
> -	VCPU_STAT("instruction_diag_500", diagnose_500),
> -	VCPU_STAT("instruction_diag_other", diagnose_other),
> -	{ NULL }
> -};
> -
>   /* allow nested virtualization in KVM (if enabled by user space) */
>   static int nested;
>   module_param(nested, int, S_IRUGO);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index abc5cc8293b3..d24055fcdc0b 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -282,53 +282,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
>   	}
>   };
>   
> -struct kvm_stats_debugfs_item debugfs_entries[] = {
> -	VCPU_STAT("pf_fixed", pf_fixed),
> -	VCPU_STAT("pf_guest", pf_guest),
> -	VCPU_STAT("tlb_flush", tlb_flush),
> -	VCPU_STAT("invlpg", invlpg),
> -	VCPU_STAT("exits", exits),
> -	VCPU_STAT("io_exits", io_exits),
> -	VCPU_STAT("mmio_exits", mmio_exits),
> -	VCPU_STAT("signal_exits", signal_exits),
> -	VCPU_STAT("irq_window", irq_window_exits),
> -	VCPU_STAT("nmi_window", nmi_window_exits),
> -	VCPU_STAT("halt_exits", halt_exits),
> -	VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> -	VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> -	VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> -	VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> -	VCPU_STAT("hypercalls", hypercalls),
> -	VCPU_STAT("request_irq", request_irq_exits),
> -	VCPU_STAT("irq_exits", irq_exits),
> -	VCPU_STAT("host_state_reload", host_state_reload),
> -	VCPU_STAT("fpu_reload", fpu_reload),
> -	VCPU_STAT("insn_emulation", insn_emulation),
> -	VCPU_STAT("insn_emulation_fail", insn_emulation_fail),
> -	VCPU_STAT("irq_injections", irq_injections),
> -	VCPU_STAT("nmi_injections", nmi_injections),
> -	VCPU_STAT("req_event", req_event),
> -	VCPU_STAT("l1d_flush", l1d_flush),
> -	VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> -	VCPU_STAT_GENERIC("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),
> -	VCPU_STAT("guest_mode", guest_mode),
> -	VM_STAT("mmu_shadow_zapped", mmu_shadow_zapped),
> -	VM_STAT("mmu_pte_write", mmu_pte_write),
> -	VM_STAT("mmu_pde_zapped", mmu_pde_zapped),
> -	VM_STAT("mmu_flooded", mmu_flooded),
> -	VM_STAT("mmu_recycled", mmu_recycled),
> -	VM_STAT("mmu_cache_miss", mmu_cache_miss),
> -	VM_STAT("mmu_unsync", mmu_unsync),
> -	VM_STAT_GENERIC("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),
> -	{ NULL }
> -};
> -
>   u64 __read_mostly host_xcr0;
>   u64 __read_mostly supported_xcr0;
>   EXPORT_SYMBOL_GPL(supported_xcr0);
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 5e77f32abef5..60ddb64a134e 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -589,7 +589,6 @@ struct kvm {
>   	struct list_head devices;
>   	u64 manual_dirty_log_protect;
>   	struct dentry *debugfs_dentry;
> -	struct kvm_stat_data **debugfs_stat_data;
>   	struct srcu_struct srcu;
>   	struct srcu_struct irq_srcu;
>   	pid_t userspace_pid;
> @@ -1255,23 +1254,6 @@ static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
>   	return kvm_is_error_hva(hva);
>   }
>   
> -enum kvm_stat_kind {
> -	KVM_STAT_VM,
> -	KVM_STAT_VCPU,
> -};
> -
> -struct kvm_stat_data {
> -	struct kvm *kvm;
> -	struct kvm_stats_debugfs_item *dbgfs_item;
> -};
> -
> -struct kvm_stats_debugfs_item {
> -	const char *name;
> -	int offset;
> -	enum kvm_stat_kind kind;
> -	int mode;
> -};
> -
>   struct _kvm_stats_header {
>   	struct kvm_stats_header header;
>   	char id[KVM_STATS_ID_MAXLEN];
> @@ -1283,20 +1265,7 @@ struct _kvm_stats_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, ...)						       \
> -	{ n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT(n, x, ...)						       \
> -	{ n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> -#define VM_STAT_GENERIC(n, x, ...)					       \
> -	{ n, offsetof(struct kvm, stat.generic.x), KVM_STAT_VM, ## __VA_ARGS__ }
> -#define VCPU_STAT_GENERIC(n, x, ...)					       \
> -	{ n, offsetof(struct kvm_vcpu, stat.generic.x),			       \
> -	  KVM_STAT_VCPU, ## __VA_ARGS__ }
> -
> -#define STATS_DESC(stat, type, unit, base, exp)			       \
> +#define STATS_DESC(stat, type, unit, base, exp)				       \
>   	{								       \
>   		{							       \
>   			.flags = type | unit | base |			       \
> @@ -1410,7 +1379,6 @@ struct _kvm_stats_desc {
>   	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;
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index f5bea71ea61c..f2da1d94057d 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -115,9 +115,6 @@ static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu);
>   struct dentry *kvm_debugfs_dir;
>   EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
>   
> -static int kvm_debugfs_num_entries;
> -static const struct file_operations stat_fops_per_vm;
> -
>   static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
>   			   unsigned long arg);
>   #ifdef CONFIG_KVM_COMPAT
> @@ -862,25 +859,15 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
>   
>   static void kvm_destroy_vm_debugfs(struct kvm *kvm)
>   {
> -	int i;
> -
>   	if (!kvm->debugfs_dentry)
>   		return;
>   
>   	debugfs_remove_recursive(kvm->debugfs_dentry);
> -
> -	if (kvm->debugfs_stat_data) {
> -		for (i = 0; i < kvm_debugfs_num_entries; i++)
> -			kfree(kvm->debugfs_stat_data[i]);
> -		kfree(kvm->debugfs_stat_data);
> -	}
>   }
>   
>   static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
>   {
>   	char dir_name[ITOA_MAX_LEN * 2];
> -	struct kvm_stat_data *stat_data;
> -	struct kvm_stats_debugfs_item *p;
>   
>   	if (!debugfs_initialized())
>   		return 0;
> @@ -888,24 +875,6 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
>   	snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
>   	kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
>   
> -	kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
> -					 sizeof(*kvm->debugfs_stat_data),
> -					 GFP_KERNEL_ACCOUNT);
> -	if (!kvm->debugfs_stat_data)
> -		return -ENOMEM;
> -
> -	for (p = debugfs_entries; p->name; p++) {
> -		stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT);
> -		if (!stat_data)
> -			return -ENOMEM;
> -
> -		stat_data->kvm = kvm;
> -		stat_data->dbgfs_item = p;
> -		kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
> -		debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p),
> -				    kvm->debugfs_dentry, stat_data,
> -				    &stat_fops_per_vm);
> -	}
>   	return 0;
>   }
>   
> @@ -4937,214 +4906,6 @@ struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
>   }
>   EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
>   
> -static int kvm_debugfs_open(struct inode *inode, struct file *file,
> -			   int (*get)(void *, u64 *), int (*set)(void *, u64),
> -			   const char *fmt)
> -{
> -	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
> -					  inode->i_private;
> -
> -	/* The debugfs files are a reference to the kvm struct which
> -	 * is still valid when kvm_destroy_vm is called.
> -	 * To avoid the race between open and the removal of the debugfs
> -	 * directory we test against the users count.
> -	 */
> -	if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
> -		return -ENOENT;
> -
> -	if (simple_attr_open(inode, file, get,
> -		    KVM_DBGFS_GET_MODE(stat_data->dbgfs_item) & 0222
> -		    ? set : NULL,
> -		    fmt)) {
> -		kvm_put_kvm(stat_data->kvm);
> -		return -ENOMEM;
> -	}
> -
> -	return 0;
> -}
> -
> -static int kvm_debugfs_release(struct inode *inode, struct file *file)
> -{
> -	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
> -					  inode->i_private;
> -
> -	simple_attr_release(inode, file);
> -	kvm_put_kvm(stat_data->kvm);
> -
> -	return 0;
> -}
> -
> -static int kvm_get_stat_per_vm(struct kvm *kvm, size_t offset, u64 *val)
> -{
> -	*val = *(u64 *)((void *)kvm + offset);
> -
> -	return 0;
> -}
> -
> -static int kvm_clear_stat_per_vm(struct kvm *kvm, size_t offset)
> -{
> -	*(u64 *)((void *)kvm + offset) = 0;
> -
> -	return 0;
> -}
> -
> -static int kvm_get_stat_per_vcpu(struct kvm *kvm, size_t offset, u64 *val)
> -{
> -	int i;
> -	struct kvm_vcpu *vcpu;
> -
> -	*val = 0;
> -
> -	kvm_for_each_vcpu(i, vcpu, kvm)
> -		*val += *(u64 *)((void *)vcpu + offset);
> -
> -	return 0;
> -}
> -
> -static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset)
> -{
> -	int i;
> -	struct kvm_vcpu *vcpu;
> -
> -	kvm_for_each_vcpu(i, vcpu, kvm)
> -		*(u64 *)((void *)vcpu + offset) = 0;
> -
> -	return 0;
> -}
> -
> -static int kvm_stat_data_get(void *data, u64 *val)
> -{
> -	int r = -EFAULT;
> -	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
> -
> -	switch (stat_data->dbgfs_item->kind) {
> -	case KVM_STAT_VM:
> -		r = kvm_get_stat_per_vm(stat_data->kvm,
> -					stat_data->dbgfs_item->offset, val);
> -		break;
> -	case KVM_STAT_VCPU:
> -		r = kvm_get_stat_per_vcpu(stat_data->kvm,
> -					  stat_data->dbgfs_item->offset, val);
> -		break;
> -	}
> -
> -	return r;
> -}
> -
> -static int kvm_stat_data_clear(void *data, u64 val)
> -{
> -	int r = -EFAULT;
> -	struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
> -
> -	if (val)
> -		return -EINVAL;
> -
> -	switch (stat_data->dbgfs_item->kind) {
> -	case KVM_STAT_VM:
> -		r = kvm_clear_stat_per_vm(stat_data->kvm,
> -					  stat_data->dbgfs_item->offset);
> -		break;
> -	case KVM_STAT_VCPU:
> -		r = kvm_clear_stat_per_vcpu(stat_data->kvm,
> -					    stat_data->dbgfs_item->offset);
> -		break;
> -	}
> -
> -	return r;
> -}
> -
> -static int kvm_stat_data_open(struct inode *inode, struct file *file)
> -{
> -	__simple_attr_check_format("%llu\n", 0ull);
> -	return kvm_debugfs_open(inode, file, kvm_stat_data_get,
> -				kvm_stat_data_clear, "%llu\n");
> -}
> -
> -static const struct file_operations stat_fops_per_vm = {
> -	.owner = THIS_MODULE,
> -	.open = kvm_stat_data_open,
> -	.release = kvm_debugfs_release,
> -	.read = simple_attr_read,
> -	.write = simple_attr_write,
> -	.llseek = no_llseek,
> -};
> -
> -static int vm_stat_get(void *_offset, u64 *val)
> -{
> -	unsigned offset = (long)_offset;
> -	struct kvm *kvm;
> -	u64 tmp_val;
> -
> -	*val = 0;
> -	mutex_lock(&kvm_lock);
> -	list_for_each_entry(kvm, &vm_list, vm_list) {
> -		kvm_get_stat_per_vm(kvm, offset, &tmp_val);
> -		*val += tmp_val;
> -	}
> -	mutex_unlock(&kvm_lock);
> -	return 0;
> -}
> -
> -static int vm_stat_clear(void *_offset, u64 val)
> -{
> -	unsigned offset = (long)_offset;
> -	struct kvm *kvm;
> -
> -	if (val)
> -		return -EINVAL;
> -
> -	mutex_lock(&kvm_lock);
> -	list_for_each_entry(kvm, &vm_list, vm_list) {
> -		kvm_clear_stat_per_vm(kvm, offset);
> -	}
> -	mutex_unlock(&kvm_lock);
> -
> -	return 0;
> -}
> -
> -DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
> -
> -static int vcpu_stat_get(void *_offset, u64 *val)
> -{
> -	unsigned offset = (long)_offset;
> -	struct kvm *kvm;
> -	u64 tmp_val;
> -
> -	*val = 0;
> -	mutex_lock(&kvm_lock);
> -	list_for_each_entry(kvm, &vm_list, vm_list) {
> -		kvm_get_stat_per_vcpu(kvm, offset, &tmp_val);
> -		*val += tmp_val;
> -	}
> -	mutex_unlock(&kvm_lock);
> -	return 0;
> -}
> -
> -static int vcpu_stat_clear(void *_offset, u64 val)
> -{
> -	unsigned offset = (long)_offset;
> -	struct kvm *kvm;
> -
> -	if (val)
> -		return -EINVAL;
> -
> -	mutex_lock(&kvm_lock);
> -	list_for_each_entry(kvm, &vm_list, vm_list) {
> -		kvm_clear_stat_per_vcpu(kvm, offset);
> -	}
> -	mutex_unlock(&kvm_lock);
> -
> -	return 0;
> -}
> -
> -DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
> -			"%llu\n");
> -
> -static const struct file_operations *stat_fops[] = {
> -	[KVM_STAT_VCPU] = &vcpu_stat_fops,
> -	[KVM_STAT_VM]   = &vm_stat_fops,
> -};
> -
>   static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
>   {
>   	struct kobj_uevent_env *env;
> @@ -5179,16 +4940,6 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
>   	}
>   	add_uevent_var(env, "PID=%d", kvm->userspace_pid);
>   
> -	if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) {
> -		char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT);
> -
> -		if (p) {
> -			tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
> -			if (!IS_ERR(tmp))
> -				add_uevent_var(env, "STATS_PATH=%s", tmp);
> -			kfree(p);
> -		}
> -	}
>   	/* no need for checks, since we are adding at most only 5 keys */
>   	env->envp[env->envp_idx++] = NULL;
>   	kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
> @@ -5197,16 +4948,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
>   
>   static void kvm_init_debug(void)
>   {
> -	struct kvm_stats_debugfs_item *p;
> -
>   	kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
> -
> -	kvm_debugfs_num_entries = 0;
> -	for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
> -		debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p),
> -				    kvm_debugfs_dir, (void *)(long)p->offset,
> -				    stat_fops[p->kind]);
> -	}
>   }
>   
>   static int kvm_suspend(void)
>

On Fri, Jun 11, 2021 at 10:18 AM Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 11/06/21 17:00, Jing Zhang wrote:
> > To avoid duplication, remove the debugfs interface for KVM stats,
> > since the fd-based binary stats interface is available.
>
> That would be too easy. :)  We need to keep the debugfs code because it
> is not yet a 100% replacement for binary stats (it allows to inspect all
> running guests without collaboration from the VMM); however we can make
> it work on the binary stats descriptors instead of using struct
> kvm_stats_debugfs_item.  This way you can remove the duplication between
> the stats descriptors and the VCPU_STAT/VM_STAT entries.
>
> Thanks,
>
> Paolo
>
Ha, now I got the point. Will do.

Thanks,
Jing
> > Signed-off-by: Jing Zhang <jingzhangos@google.com>
> > ---
> >   arch/arm64/kvm/guest.c    |  16 ---
> >   arch/mips/kvm/mips.c      |  39 ------
> >   arch/powerpc/kvm/book3s.c |  33 -----
> >   arch/powerpc/kvm/booke.c  |  25 ----
> >   arch/s390/kvm/kvm-s390.c  | 108 ----------------
> >   arch/x86/kvm/x86.c        |  47 -------
> >   include/linux/kvm_host.h  |  34 +----
> >   virt/kvm/kvm_main.c       | 258 --------------------------------------
> >   8 files changed, 1 insertion(+), 559 deletions(-)
> >
> > diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
> > index 7048603f4b26..ab5b878b8b14 100644
> > --- a/arch/arm64/kvm/guest.c
> > +++ b/arch/arm64/kvm/guest.c
> > @@ -62,22 +62,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
> >       }
> >   };
> >
> > -struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT_GENERIC("halt_wakeup", 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_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     { NULL }
> > -};
> > -
> >   static bool core_reg_offset_is_vreg(u64 off)
> >   {
> >       return off >= KVM_REG_ARM_CORE_REG(fp_regs.vregs) &&
> > diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> > index 8fc70539a83b..285f009f02d1 100644
> > --- a/arch/mips/kvm/mips.c
> > +++ b/arch/mips/kvm/mips.c
> > @@ -97,45 +97,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
> >       }
> >   };
> >
> > -struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("wait", wait_exits),
> > -     VCPU_STAT("cache", cache_exits),
> > -     VCPU_STAT("signal", signal_exits),
> > -     VCPU_STAT("interrupt", int_exits),
> > -     VCPU_STAT("cop_unusable", cop_unusable_exits),
> > -     VCPU_STAT("tlbmod", tlbmod_exits),
> > -     VCPU_STAT("tlbmiss_ld", tlbmiss_ld_exits),
> > -     VCPU_STAT("tlbmiss_st", tlbmiss_st_exits),
> > -     VCPU_STAT("addrerr_st", addrerr_st_exits),
> > -     VCPU_STAT("addrerr_ld", addrerr_ld_exits),
> > -     VCPU_STAT("syscall", syscall_exits),
> > -     VCPU_STAT("resvd_inst", resvd_inst_exits),
> > -     VCPU_STAT("break_inst", break_inst_exits),
> > -     VCPU_STAT("trap_inst", trap_inst_exits),
> > -     VCPU_STAT("msa_fpe", msa_fpe_exits),
> > -     VCPU_STAT("fpe", fpe_exits),
> > -     VCPU_STAT("msa_disabled", msa_disabled_exits),
> > -     VCPU_STAT("flush_dcache", flush_dcache_exits),
> > -     VCPU_STAT("vz_gpsi", vz_gpsi_exits),
> > -     VCPU_STAT("vz_gsfc", vz_gsfc_exits),
> > -     VCPU_STAT("vz_hc", vz_hc_exits),
> > -     VCPU_STAT("vz_grr", vz_grr_exits),
> > -     VCPU_STAT("vz_gva", vz_gva_exits),
> > -     VCPU_STAT("vz_ghfc", vz_ghfc_exits),
> > -     VCPU_STAT("vz_gpa", vz_gpa_exits),
> > -     VCPU_STAT("vz_resvd", vz_resvd_exits),
> > -#ifdef CONFIG_CPU_LOONGSON64
> > -     VCPU_STAT("vz_cpucfg", vz_cpucfg_exits),
> > -#endif
> > -     VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     {NULL}
> > -};
> > -
> >   bool kvm_trace_guest_mode_change;
> >
> >   int kvm_guest_mode_change_trace_reg(void)
> > diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
> > index eff5a96aa638..f0fd9d1d5ee0 100644
> > --- a/arch/powerpc/kvm/book3s.c
> > +++ b/arch/powerpc/kvm/book3s.c
> > @@ -98,39 +98,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
> >       }
> >   };
> >
> > -struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("exits", sum_exits),
> > -     VCPU_STAT("mmio", mmio_exits),
> > -     VCPU_STAT("sig", signal_exits),
> > -     VCPU_STAT("sysc", syscall_exits),
> > -     VCPU_STAT("inst_emu", emulated_inst_exits),
> > -     VCPU_STAT("dec", dec_exits),
> > -     VCPU_STAT("ext_intr", ext_intr_exits),
> > -     VCPU_STAT("queue_intr", queue_intr),
> > -     VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     VCPU_STAT("halt_wait_ns", halt_wait_ns),
> > -     VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT("halt_successful_wait", halt_successful_wait),
> > -     VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("pf_storage", pf_storage),
> > -     VCPU_STAT("sp_storage", sp_storage),
> > -     VCPU_STAT("pf_instruc", pf_instruc),
> > -     VCPU_STAT("sp_instruc", sp_instruc),
> > -     VCPU_STAT("ld", ld),
> > -     VCPU_STAT("ld_slow", ld_slow),
> > -     VCPU_STAT("st", st),
> > -     VCPU_STAT("st_slow", st_slow),
> > -     VCPU_STAT("pthru_all", pthru_all),
> > -     VCPU_STAT("pthru_host", pthru_host),
> > -     VCPU_STAT("pthru_bad_aff", pthru_bad_aff),
> > -     VM_STAT("largepages_2M", num_2M_pages, .mode = 0444),
> > -     VM_STAT("largepages_1G", num_1G_pages, .mode = 0444),
> > -     { NULL }
> > -};
> > -
> >   static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu,
> >                       unsigned long pending_now, unsigned long old_pending)
> >   {
> > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> > index 5b0c4dff4f10..890ec72cd327 100644
> > --- a/arch/powerpc/kvm/booke.c
> > +++ b/arch/powerpc/kvm/booke.c
> > @@ -89,31 +89,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
> >       }
> >   };
> >
> > -struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("mmio", mmio_exits),
> > -     VCPU_STAT("sig", signal_exits),
> > -     VCPU_STAT("itlb_r", itlb_real_miss_exits),
> > -     VCPU_STAT("itlb_v", itlb_virt_miss_exits),
> > -     VCPU_STAT("dtlb_r", dtlb_real_miss_exits),
> > -     VCPU_STAT("dtlb_v", dtlb_virt_miss_exits),
> > -     VCPU_STAT("sysc", syscall_exits),
> > -     VCPU_STAT("isi", isi_exits),
> > -     VCPU_STAT("dsi", dsi_exits),
> > -     VCPU_STAT("inst_emu", emulated_inst_exits),
> > -     VCPU_STAT("dec", dec_exits),
> > -     VCPU_STAT("ext_intr", ext_intr_exits),
> > -     VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("doorbell", dbell_exits),
> > -     VCPU_STAT("guest doorbell", gdbell_exits),
> > -     VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT_GENERIC("halt_poll_fail_ns", halt_poll_fail_ns),
> > -     VM_STAT_GENERIC("remote_tlb_flush", remote_tlb_flush),
> > -     { NULL }
> > -};
> > -
> >   /* TODO: use vcpu_printf() */
> >   void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
> >   {
> > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> > index 522a6ac2e347..75d6d499c455 100644
> > --- a/arch/s390/kvm/kvm-s390.c
> > +++ b/arch/s390/kvm/kvm-s390.c
> > @@ -183,114 +183,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
> >       }
> >   };
> >
> > -struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("userspace_handled", exit_userspace),
> > -     VCPU_STAT("exit_null", exit_null),
> > -     VCPU_STAT("pfault_sync", pfault_sync),
> > -     VCPU_STAT("exit_validity", exit_validity),
> > -     VCPU_STAT("exit_stop_request", exit_stop_request),
> > -     VCPU_STAT("exit_external_request", exit_external_request),
> > -     VCPU_STAT("exit_io_request", exit_io_request),
> > -     VCPU_STAT("exit_external_interrupt", exit_external_interrupt),
> > -     VCPU_STAT("exit_instruction", exit_instruction),
> > -     VCPU_STAT("exit_pei", exit_pei),
> > -     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_GENERIC("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT("halt_no_poll_steal", halt_no_poll_steal),
> > -     VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT_GENERIC("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),
> > -     VCPU_STAT("instruction_stctg", instruction_stctg),
> > -     VCPU_STAT("deliver_ckc", deliver_ckc),
> > -     VCPU_STAT("deliver_cputm", deliver_cputm),
> > -     VCPU_STAT("deliver_emergency_signal", deliver_emergency_signal),
> > -     VCPU_STAT("deliver_external_call", deliver_external_call),
> > -     VCPU_STAT("deliver_service_signal", deliver_service_signal),
> > -     VCPU_STAT("deliver_virtio", deliver_virtio),
> > -     VCPU_STAT("deliver_stop_signal", deliver_stop_signal),
> > -     VCPU_STAT("deliver_prefix_signal", deliver_prefix_signal),
> > -     VCPU_STAT("deliver_restart_signal", deliver_restart_signal),
> > -     VCPU_STAT("deliver_program", deliver_program),
> > -     VCPU_STAT("deliver_io", deliver_io),
> > -     VCPU_STAT("deliver_machine_check", deliver_machine_check),
> > -     VCPU_STAT("exit_wait_state", exit_wait_state),
> > -     VCPU_STAT("inject_ckc", inject_ckc),
> > -     VCPU_STAT("inject_cputm", inject_cputm),
> > -     VCPU_STAT("inject_external_call", inject_external_call),
> > -     VM_STAT("inject_float_mchk", inject_float_mchk),
> > -     VCPU_STAT("inject_emergency_signal", inject_emergency_signal),
> > -     VM_STAT("inject_io", inject_io),
> > -     VCPU_STAT("inject_mchk", inject_mchk),
> > -     VM_STAT("inject_pfault_done", inject_pfault_done),
> > -     VCPU_STAT("inject_program", inject_program),
> > -     VCPU_STAT("inject_restart", inject_restart),
> > -     VM_STAT("inject_service_signal", inject_service_signal),
> > -     VCPU_STAT("inject_set_prefix", inject_set_prefix),
> > -     VCPU_STAT("inject_stop_signal", inject_stop_signal),
> > -     VCPU_STAT("inject_pfault_init", inject_pfault_init),
> > -     VM_STAT("inject_virtio", inject_virtio),
> > -     VCPU_STAT("instruction_epsw", instruction_epsw),
> > -     VCPU_STAT("instruction_gs", instruction_gs),
> > -     VCPU_STAT("instruction_io_other", instruction_io_other),
> > -     VCPU_STAT("instruction_lpsw", instruction_lpsw),
> > -     VCPU_STAT("instruction_lpswe", instruction_lpswe),
> > -     VCPU_STAT("instruction_pfmf", instruction_pfmf),
> > -     VCPU_STAT("instruction_ptff", instruction_ptff),
> > -     VCPU_STAT("instruction_stidp", instruction_stidp),
> > -     VCPU_STAT("instruction_sck", instruction_sck),
> > -     VCPU_STAT("instruction_sckpf", instruction_sckpf),
> > -     VCPU_STAT("instruction_spx", instruction_spx),
> > -     VCPU_STAT("instruction_stpx", instruction_stpx),
> > -     VCPU_STAT("instruction_stap", instruction_stap),
> > -     VCPU_STAT("instruction_iske", instruction_iske),
> > -     VCPU_STAT("instruction_ri", instruction_ri),
> > -     VCPU_STAT("instruction_rrbe", instruction_rrbe),
> > -     VCPU_STAT("instruction_sske", instruction_sske),
> > -     VCPU_STAT("instruction_ipte_interlock", instruction_ipte_interlock),
> > -     VCPU_STAT("instruction_essa", instruction_essa),
> > -     VCPU_STAT("instruction_stsi", instruction_stsi),
> > -     VCPU_STAT("instruction_stfl", instruction_stfl),
> > -     VCPU_STAT("instruction_tb", instruction_tb),
> > -     VCPU_STAT("instruction_tpi", instruction_tpi),
> > -     VCPU_STAT("instruction_tprot", instruction_tprot),
> > -     VCPU_STAT("instruction_tsch", instruction_tsch),
> > -     VCPU_STAT("instruction_sthyi", instruction_sthyi),
> > -     VCPU_STAT("instruction_sie", instruction_sie),
> > -     VCPU_STAT("instruction_sigp_sense", instruction_sigp_sense),
> > -     VCPU_STAT("instruction_sigp_sense_running", instruction_sigp_sense_running),
> > -     VCPU_STAT("instruction_sigp_external_call", instruction_sigp_external_call),
> > -     VCPU_STAT("instruction_sigp_emergency", instruction_sigp_emergency),
> > -     VCPU_STAT("instruction_sigp_cond_emergency", instruction_sigp_cond_emergency),
> > -     VCPU_STAT("instruction_sigp_start", instruction_sigp_start),
> > -     VCPU_STAT("instruction_sigp_stop", instruction_sigp_stop),
> > -     VCPU_STAT("instruction_sigp_stop_store_status", instruction_sigp_stop_store_status),
> > -     VCPU_STAT("instruction_sigp_store_status", instruction_sigp_store_status),
> > -     VCPU_STAT("instruction_sigp_store_adtl_status", instruction_sigp_store_adtl_status),
> > -     VCPU_STAT("instruction_sigp_set_arch", instruction_sigp_arch),
> > -     VCPU_STAT("instruction_sigp_set_prefix", instruction_sigp_prefix),
> > -     VCPU_STAT("instruction_sigp_restart", instruction_sigp_restart),
> > -     VCPU_STAT("instruction_sigp_cpu_reset", instruction_sigp_cpu_reset),
> > -     VCPU_STAT("instruction_sigp_init_cpu_reset", instruction_sigp_init_cpu_reset),
> > -     VCPU_STAT("instruction_sigp_unknown", instruction_sigp_unknown),
> > -     VCPU_STAT("instruction_diag_10", diagnose_10),
> > -     VCPU_STAT("instruction_diag_44", diagnose_44),
> > -     VCPU_STAT("instruction_diag_9c", diagnose_9c),
> > -     VCPU_STAT("diag_9c_ignored", diagnose_9c_ignored),
> > -     VCPU_STAT("diag_9c_forward", diagnose_9c_forward),
> > -     VCPU_STAT("instruction_diag_258", diagnose_258),
> > -     VCPU_STAT("instruction_diag_308", diagnose_308),
> > -     VCPU_STAT("instruction_diag_500", diagnose_500),
> > -     VCPU_STAT("instruction_diag_other", diagnose_other),
> > -     { NULL }
> > -};
> > -
> >   /* allow nested virtualization in KVM (if enabled by user space) */
> >   static int nested;
> >   module_param(nested, int, S_IRUGO);
> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index abc5cc8293b3..d24055fcdc0b 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -282,53 +282,6 @@ struct _kvm_stats_header kvm_vcpu_stats_header = {
> >       }
> >   };
> >
> > -struct kvm_stats_debugfs_item debugfs_entries[] = {
> > -     VCPU_STAT("pf_fixed", pf_fixed),
> > -     VCPU_STAT("pf_guest", pf_guest),
> > -     VCPU_STAT("tlb_flush", tlb_flush),
> > -     VCPU_STAT("invlpg", invlpg),
> > -     VCPU_STAT("exits", exits),
> > -     VCPU_STAT("io_exits", io_exits),
> > -     VCPU_STAT("mmio_exits", mmio_exits),
> > -     VCPU_STAT("signal_exits", signal_exits),
> > -     VCPU_STAT("irq_window", irq_window_exits),
> > -     VCPU_STAT("nmi_window", nmi_window_exits),
> > -     VCPU_STAT("halt_exits", halt_exits),
> > -     VCPU_STAT_GENERIC("halt_successful_poll", halt_successful_poll),
> > -     VCPU_STAT_GENERIC("halt_attempted_poll", halt_attempted_poll),
> > -     VCPU_STAT_GENERIC("halt_poll_invalid", halt_poll_invalid),
> > -     VCPU_STAT_GENERIC("halt_wakeup", halt_wakeup),
> > -     VCPU_STAT("hypercalls", hypercalls),
> > -     VCPU_STAT("request_irq", request_irq_exits),
> > -     VCPU_STAT("irq_exits", irq_exits),
> > -     VCPU_STAT("host_state_reload", host_state_reload),
> > -     VCPU_STAT("fpu_reload", fpu_reload),
> > -     VCPU_STAT("insn_emulation", insn_emulation),
> > -     VCPU_STAT("insn_emulation_fail", insn_emulation_fail),
> > -     VCPU_STAT("irq_injections", irq_injections),
> > -     VCPU_STAT("nmi_injections", nmi_injections),
> > -     VCPU_STAT("req_event", req_event),
> > -     VCPU_STAT("l1d_flush", l1d_flush),
> > -     VCPU_STAT_GENERIC("halt_poll_success_ns", halt_poll_success_ns),
> > -     VCPU_STAT_GENERIC("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),
> > -     VCPU_STAT("guest_mode", guest_mode),
> > -     VM_STAT("mmu_shadow_zapped", mmu_shadow_zapped),
> > -     VM_STAT("mmu_pte_write", mmu_pte_write),
> > -     VM_STAT("mmu_pde_zapped", mmu_pde_zapped),
> > -     VM_STAT("mmu_flooded", mmu_flooded),
> > -     VM_STAT("mmu_recycled", mmu_recycled),
> > -     VM_STAT("mmu_cache_miss", mmu_cache_miss),
> > -     VM_STAT("mmu_unsync", mmu_unsync),
> > -     VM_STAT_GENERIC("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),
> > -     { NULL }
> > -};
> > -
> >   u64 __read_mostly host_xcr0;
> >   u64 __read_mostly supported_xcr0;
> >   EXPORT_SYMBOL_GPL(supported_xcr0);
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 5e77f32abef5..60ddb64a134e 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -589,7 +589,6 @@ struct kvm {
> >       struct list_head devices;
> >       u64 manual_dirty_log_protect;
> >       struct dentry *debugfs_dentry;
> > -     struct kvm_stat_data **debugfs_stat_data;
> >       struct srcu_struct srcu;
> >       struct srcu_struct irq_srcu;
> >       pid_t userspace_pid;
> > @@ -1255,23 +1254,6 @@ static inline bool kvm_is_error_gpa(struct kvm *kvm, gpa_t gpa)
> >       return kvm_is_error_hva(hva);
> >   }
> >
> > -enum kvm_stat_kind {
> > -     KVM_STAT_VM,
> > -     KVM_STAT_VCPU,
> > -};
> > -
> > -struct kvm_stat_data {
> > -     struct kvm *kvm;
> > -     struct kvm_stats_debugfs_item *dbgfs_item;
> > -};
> > -
> > -struct kvm_stats_debugfs_item {
> > -     const char *name;
> > -     int offset;
> > -     enum kvm_stat_kind kind;
> > -     int mode;
> > -};
> > -
> >   struct _kvm_stats_header {
> >       struct kvm_stats_header header;
> >       char id[KVM_STATS_ID_MAXLEN];
> > @@ -1283,20 +1265,7 @@ struct _kvm_stats_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, ...)                                                  \
> > -     { n, offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT(n, x, ...)                                                \
> > -     { n, offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__ }
> > -#define VM_STAT_GENERIC(n, x, ...)                                          \
> > -     { n, offsetof(struct kvm, stat.generic.x), KVM_STAT_VM, ## __VA_ARGS__ }
> > -#define VCPU_STAT_GENERIC(n, x, ...)                                        \
> > -     { n, offsetof(struct kvm_vcpu, stat.generic.x),                        \
> > -       KVM_STAT_VCPU, ## __VA_ARGS__ }
> > -
> > -#define STATS_DESC(stat, type, unit, base, exp)                             \
> > +#define STATS_DESC(stat, type, unit, base, exp)                                     \
> >       {                                                                      \
> >               {                                                              \
> >                       .flags = type | unit | base |                          \
> > @@ -1410,7 +1379,6 @@ struct _kvm_stats_desc {
> >       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;
> > diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> > index f5bea71ea61c..f2da1d94057d 100644
> > --- a/virt/kvm/kvm_main.c
> > +++ b/virt/kvm/kvm_main.c
> > @@ -115,9 +115,6 @@ static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_running_vcpu);
> >   struct dentry *kvm_debugfs_dir;
> >   EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
> >
> > -static int kvm_debugfs_num_entries;
> > -static const struct file_operations stat_fops_per_vm;
> > -
> >   static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
> >                          unsigned long arg);
> >   #ifdef CONFIG_KVM_COMPAT
> > @@ -862,25 +859,15 @@ static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
> >
> >   static void kvm_destroy_vm_debugfs(struct kvm *kvm)
> >   {
> > -     int i;
> > -
> >       if (!kvm->debugfs_dentry)
> >               return;
> >
> >       debugfs_remove_recursive(kvm->debugfs_dentry);
> > -
> > -     if (kvm->debugfs_stat_data) {
> > -             for (i = 0; i < kvm_debugfs_num_entries; i++)
> > -                     kfree(kvm->debugfs_stat_data[i]);
> > -             kfree(kvm->debugfs_stat_data);
> > -     }
> >   }
> >
> >   static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
> >   {
> >       char dir_name[ITOA_MAX_LEN * 2];
> > -     struct kvm_stat_data *stat_data;
> > -     struct kvm_stats_debugfs_item *p;
> >
> >       if (!debugfs_initialized())
> >               return 0;
> > @@ -888,24 +875,6 @@ static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
> >       snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
> >       kvm->debugfs_dentry = debugfs_create_dir(dir_name, kvm_debugfs_dir);
> >
> > -     kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
> > -                                      sizeof(*kvm->debugfs_stat_data),
> > -                                      GFP_KERNEL_ACCOUNT);
> > -     if (!kvm->debugfs_stat_data)
> > -             return -ENOMEM;
> > -
> > -     for (p = debugfs_entries; p->name; p++) {
> > -             stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL_ACCOUNT);
> > -             if (!stat_data)
> > -                     return -ENOMEM;
> > -
> > -             stat_data->kvm = kvm;
> > -             stat_data->dbgfs_item = p;
> > -             kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
> > -             debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p),
> > -                                 kvm->debugfs_dentry, stat_data,
> > -                                 &stat_fops_per_vm);
> > -     }
> >       return 0;
> >   }
> >
> > @@ -4937,214 +4906,6 @@ struct kvm_io_device *kvm_io_bus_get_dev(struct kvm *kvm, enum kvm_bus bus_idx,
> >   }
> >   EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);
> >
> > -static int kvm_debugfs_open(struct inode *inode, struct file *file,
> > -                        int (*get)(void *, u64 *), int (*set)(void *, u64),
> > -                        const char *fmt)
> > -{
> > -     struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
> > -                                       inode->i_private;
> > -
> > -     /* The debugfs files are a reference to the kvm struct which
> > -      * is still valid when kvm_destroy_vm is called.
> > -      * To avoid the race between open and the removal of the debugfs
> > -      * directory we test against the users count.
> > -      */
> > -     if (!refcount_inc_not_zero(&stat_data->kvm->users_count))
> > -             return -ENOENT;
> > -
> > -     if (simple_attr_open(inode, file, get,
> > -                 KVM_DBGFS_GET_MODE(stat_data->dbgfs_item) & 0222
> > -                 ? set : NULL,
> > -                 fmt)) {
> > -             kvm_put_kvm(stat_data->kvm);
> > -             return -ENOMEM;
> > -     }
> > -
> > -     return 0;
> > -}
> > -
> > -static int kvm_debugfs_release(struct inode *inode, struct file *file)
> > -{
> > -     struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
> > -                                       inode->i_private;
> > -
> > -     simple_attr_release(inode, file);
> > -     kvm_put_kvm(stat_data->kvm);
> > -
> > -     return 0;
> > -}
> > -
> > -static int kvm_get_stat_per_vm(struct kvm *kvm, size_t offset, u64 *val)
> > -{
> > -     *val = *(u64 *)((void *)kvm + offset);
> > -
> > -     return 0;
> > -}
> > -
> > -static int kvm_clear_stat_per_vm(struct kvm *kvm, size_t offset)
> > -{
> > -     *(u64 *)((void *)kvm + offset) = 0;
> > -
> > -     return 0;
> > -}
> > -
> > -static int kvm_get_stat_per_vcpu(struct kvm *kvm, size_t offset, u64 *val)
> > -{
> > -     int i;
> > -     struct kvm_vcpu *vcpu;
> > -
> > -     *val = 0;
> > -
> > -     kvm_for_each_vcpu(i, vcpu, kvm)
> > -             *val += *(u64 *)((void *)vcpu + offset);
> > -
> > -     return 0;
> > -}
> > -
> > -static int kvm_clear_stat_per_vcpu(struct kvm *kvm, size_t offset)
> > -{
> > -     int i;
> > -     struct kvm_vcpu *vcpu;
> > -
> > -     kvm_for_each_vcpu(i, vcpu, kvm)
> > -             *(u64 *)((void *)vcpu + offset) = 0;
> > -
> > -     return 0;
> > -}
> > -
> > -static int kvm_stat_data_get(void *data, u64 *val)
> > -{
> > -     int r = -EFAULT;
> > -     struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
> > -
> > -     switch (stat_data->dbgfs_item->kind) {
> > -     case KVM_STAT_VM:
> > -             r = kvm_get_stat_per_vm(stat_data->kvm,
> > -                                     stat_data->dbgfs_item->offset, val);
> > -             break;
> > -     case KVM_STAT_VCPU:
> > -             r = kvm_get_stat_per_vcpu(stat_data->kvm,
> > -                                       stat_data->dbgfs_item->offset, val);
> > -             break;
> > -     }
> > -
> > -     return r;
> > -}
> > -
> > -static int kvm_stat_data_clear(void *data, u64 val)
> > -{
> > -     int r = -EFAULT;
> > -     struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
> > -
> > -     if (val)
> > -             return -EINVAL;
> > -
> > -     switch (stat_data->dbgfs_item->kind) {
> > -     case KVM_STAT_VM:
> > -             r = kvm_clear_stat_per_vm(stat_data->kvm,
> > -                                       stat_data->dbgfs_item->offset);
> > -             break;
> > -     case KVM_STAT_VCPU:
> > -             r = kvm_clear_stat_per_vcpu(stat_data->kvm,
> > -                                         stat_data->dbgfs_item->offset);
> > -             break;
> > -     }
> > -
> > -     return r;
> > -}
> > -
> > -static int kvm_stat_data_open(struct inode *inode, struct file *file)
> > -{
> > -     __simple_attr_check_format("%llu\n", 0ull);
> > -     return kvm_debugfs_open(inode, file, kvm_stat_data_get,
> > -                             kvm_stat_data_clear, "%llu\n");
> > -}
> > -
> > -static const struct file_operations stat_fops_per_vm = {
> > -     .owner = THIS_MODULE,
> > -     .open = kvm_stat_data_open,
> > -     .release = kvm_debugfs_release,
> > -     .read = simple_attr_read,
> > -     .write = simple_attr_write,
> > -     .llseek = no_llseek,
> > -};
> > -
> > -static int vm_stat_get(void *_offset, u64 *val)
> > -{
> > -     unsigned offset = (long)_offset;
> > -     struct kvm *kvm;
> > -     u64 tmp_val;
> > -
> > -     *val = 0;
> > -     mutex_lock(&kvm_lock);
> > -     list_for_each_entry(kvm, &vm_list, vm_list) {
> > -             kvm_get_stat_per_vm(kvm, offset, &tmp_val);
> > -             *val += tmp_val;
> > -     }
> > -     mutex_unlock(&kvm_lock);
> > -     return 0;
> > -}
> > -
> > -static int vm_stat_clear(void *_offset, u64 val)
> > -{
> > -     unsigned offset = (long)_offset;
> > -     struct kvm *kvm;
> > -
> > -     if (val)
> > -             return -EINVAL;
> > -
> > -     mutex_lock(&kvm_lock);
> > -     list_for_each_entry(kvm, &vm_list, vm_list) {
> > -             kvm_clear_stat_per_vm(kvm, offset);
> > -     }
> > -     mutex_unlock(&kvm_lock);
> > -
> > -     return 0;
> > -}
> > -
> > -DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, vm_stat_clear, "%llu\n");
> > -
> > -static int vcpu_stat_get(void *_offset, u64 *val)
> > -{
> > -     unsigned offset = (long)_offset;
> > -     struct kvm *kvm;
> > -     u64 tmp_val;
> > -
> > -     *val = 0;
> > -     mutex_lock(&kvm_lock);
> > -     list_for_each_entry(kvm, &vm_list, vm_list) {
> > -             kvm_get_stat_per_vcpu(kvm, offset, &tmp_val);
> > -             *val += tmp_val;
> > -     }
> > -     mutex_unlock(&kvm_lock);
> > -     return 0;
> > -}
> > -
> > -static int vcpu_stat_clear(void *_offset, u64 val)
> > -{
> > -     unsigned offset = (long)_offset;
> > -     struct kvm *kvm;
> > -
> > -     if (val)
> > -             return -EINVAL;
> > -
> > -     mutex_lock(&kvm_lock);
> > -     list_for_each_entry(kvm, &vm_list, vm_list) {
> > -             kvm_clear_stat_per_vcpu(kvm, offset);
> > -     }
> > -     mutex_unlock(&kvm_lock);
> > -
> > -     return 0;
> > -}
> > -
> > -DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, vcpu_stat_clear,
> > -                     "%llu\n");
> > -
> > -static const struct file_operations *stat_fops[] = {
> > -     [KVM_STAT_VCPU] = &vcpu_stat_fops,
> > -     [KVM_STAT_VM]   = &vm_stat_fops,
> > -};
> > -
> >   static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
> >   {
> >       struct kobj_uevent_env *env;
> > @@ -5179,16 +4940,6 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
> >       }
> >       add_uevent_var(env, "PID=%d", kvm->userspace_pid);
> >
> > -     if (!IS_ERR_OR_NULL(kvm->debugfs_dentry)) {
> > -             char *tmp, *p = kmalloc(PATH_MAX, GFP_KERNEL_ACCOUNT);
> > -
> > -             if (p) {
> > -                     tmp = dentry_path_raw(kvm->debugfs_dentry, p, PATH_MAX);
> > -                     if (!IS_ERR(tmp))
> > -                             add_uevent_var(env, "STATS_PATH=%s", tmp);
> > -                     kfree(p);
> > -             }
> > -     }
> >       /* no need for checks, since we are adding at most only 5 keys */
> >       env->envp[env->envp_idx++] = NULL;
> >       kobject_uevent_env(&kvm_dev.this_device->kobj, KOBJ_CHANGE, env->envp);
> > @@ -5197,16 +4948,7 @@ static void kvm_uevent_notify_change(unsigned int type, struct kvm *kvm)
> >
> >   static void kvm_init_debug(void)
> >   {
> > -     struct kvm_stats_debugfs_item *p;
> > -
> >       kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
> > -
> > -     kvm_debugfs_num_entries = 0;
> > -     for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
> > -             debugfs_create_file(p->name, KVM_DBGFS_GET_MODE(p),
> > -                                 kvm_debugfs_dir, (void *)(long)p->offset,
> > -                                 stat_fops[p->kind]);
> > -     }
> >   }
> >
> >   static int kvm_suspend(void)
> >
>