diff options
| -rw-r--r-- | arch/arm64/include/asm/kvm_host.h | 10 | ||||
| -rw-r--r-- | arch/arm64/kvm/arm.c | 5 | ||||
| -rw-r--r-- | arch/x86/include/asm/kvm_host.h | 3 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 53 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 10 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 44 |
6 files changed, 83 insertions, 42 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index f680f303ba7c..aa28b8e0e5d0 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -678,6 +678,16 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); void kvm_perf_init(void); void kvm_perf_teardown(void); +/* + * Returns true if a Performance Monitoring Interrupt (PMI), a.k.a. perf event, + * arrived in guest context. For arm64, any event that arrives while a vCPU is + * loaded is considered to be "in guest". + */ +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) +{ + return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu; +} + long kvm_hypercall_pv_features(struct kvm_vcpu *vcpu); gpa_t kvm_init_stolen_time(struct kvm_vcpu *vcpu); void kvm_update_stolen_time(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 2f03cbfefe67..b400be996040 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -496,6 +496,11 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) return vcpu_mode_priv(vcpu); } +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu) +{ + return *vcpu_pc(vcpu); +} + /* Just ensure a guest exit from a particular CPU */ static void exit_vm_noop(void *info) { diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 38f01b00d82a..89576549b1d5 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1567,6 +1567,9 @@ static inline int kvm_arch_flush_remote_tlb(struct kvm *kvm) return -ENOTSUPP; } +#define kvm_arch_pmi_in_guest(vcpu) \ + ((vcpu) && (vcpu)->arch.handling_intr_from_guest) + int kvm_mmu_module_init(void); void kvm_mmu_module_exit(void); diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ab032ef7879f..32cb6f9ca077 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8469,43 +8469,12 @@ static void kvm_timer_init(void) kvmclock_cpu_online, kvmclock_cpu_down_prep); } -static inline bool kvm_pmi_in_guest(struct kvm_vcpu *vcpu) -{ - return vcpu && vcpu->arch.handling_intr_from_guest; -} - -static unsigned int kvm_guest_state(void) -{ - struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); - unsigned int state; - - if (!kvm_pmi_in_guest(vcpu)) - return 0; - - state = PERF_GUEST_ACTIVE; - if (static_call(kvm_x86_get_cpl)(vcpu)) - state |= PERF_GUEST_USER; - - return state; -} - -static unsigned long kvm_guest_get_ip(void) -{ - struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); - - /* Retrieving the IP must be guarded by a call to kvm_guest_state(). */ - if (WARN_ON_ONCE(!kvm_pmi_in_guest(vcpu))) - return 0; - - return kvm_rip_read(vcpu); -} - static unsigned int kvm_handle_intel_pt_intr(void) { struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); /* '0' on failure so that the !PT case can use a RET0 static call. */ - if (!kvm_pmi_in_guest(vcpu)) + if (!kvm_arch_pmi_in_guest(vcpu)) return 0; kvm_make_request(KVM_REQ_PMI, vcpu); @@ -8514,12 +8483,6 @@ static unsigned int kvm_handle_intel_pt_intr(void) return 1; } -static struct perf_guest_info_callbacks kvm_guest_cbs = { - .state = kvm_guest_state, - .get_ip = kvm_guest_get_ip, - .handle_intel_pt_intr = NULL, -}; - #ifdef CONFIG_X86_64 static void pvclock_gtod_update_fn(struct work_struct *work) { @@ -11229,9 +11192,11 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); kvm_ops_static_call_update(); + /* Temporary ugliness. */ if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest()) - kvm_guest_cbs.handle_intel_pt_intr = kvm_handle_intel_pt_intr; - perf_register_guest_info_callbacks(&kvm_guest_cbs); + kvm_register_perf_callbacks(kvm_handle_intel_pt_intr); + else + kvm_register_perf_callbacks(NULL); if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) supported_xss = 0; @@ -11260,8 +11225,7 @@ int kvm_arch_hardware_setup(void *opaque) void kvm_arch_hardware_unsetup(void) { - perf_unregister_guest_info_callbacks(&kvm_guest_cbs); - kvm_guest_cbs.handle_intel_pt_intr = NULL; + kvm_unregister_perf_callbacks(); static_call(kvm_x86_hardware_unsetup)(); } @@ -11852,6 +11816,11 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) return vcpu->arch.preempted_in_kernel; } +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu) +{ + return kvm_rip_read(vcpu); +} + int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) { return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 9e0667e3723e..9df7ab2d7530 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1170,6 +1170,16 @@ static inline bool kvm_arch_intc_initialized(struct kvm *kvm) } #endif +#ifdef CONFIG_GUEST_PERF_EVENTS +unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu); + +void kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void)); +void kvm_unregister_perf_callbacks(void); +#else +static inline void kvm_register_perf_callbacks(void *ign) {} +static inline void kvm_unregister_perf_callbacks(void) {} +#endif /* CONFIG_GUEST_PERF_EVENTS */ + int kvm_arch_init_vm(struct kvm *kvm, unsigned long type); void kvm_arch_destroy_vm(struct kvm *kvm); void kvm_arch_sync_events(struct kvm *kvm); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index d31724500501..76778dd2351f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5479,6 +5479,50 @@ struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) return &kvm_running_vcpu; } +#ifdef CONFIG_GUEST_PERF_EVENTS +static unsigned int kvm_guest_state(void) +{ + struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); + unsigned int state; + + if (!kvm_arch_pmi_in_guest(vcpu)) + return 0; + + state = PERF_GUEST_ACTIVE; + if (!kvm_arch_vcpu_in_kernel(vcpu)) + state |= PERF_GUEST_USER; + + return state; +} + +static unsigned long kvm_guest_get_ip(void) +{ + struct kvm_vcpu *vcpu = kvm_get_running_vcpu(); + + /* Retrieving the IP must be guarded by a call to kvm_guest_state(). */ + if (WARN_ON_ONCE(!kvm_arch_pmi_in_guest(vcpu))) + return 0; + + return kvm_arch_vcpu_get_ip(vcpu); +} + +static struct perf_guest_info_callbacks kvm_guest_cbs = { + .state = kvm_guest_state, + .get_ip = kvm_guest_get_ip, + .handle_intel_pt_intr = NULL, +}; + +void kvm_register_perf_callbacks(unsigned int (*pt_intr_handler)(void)) +{ + kvm_guest_cbs.handle_intel_pt_intr = pt_intr_handler; + perf_register_guest_info_callbacks(&kvm_guest_cbs); +} +void kvm_unregister_perf_callbacks(void) +{ + perf_unregister_guest_info_callbacks(&kvm_guest_cbs); +} +#endif + struct kvm_cpu_compat_check { void *opaque; int *ret; |