| Message ID | 20210922000533.713300-13-seanjc@google.com (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | perf: KVM: Fix, optimize, and clean up callbacks | expand |
On 22/09/21 02:05, Sean Christopherson wrote: > Move x86's perf guest callbacks into common KVM, as they are semantically > identical to arm64's callbacks (the only other such KVM callbacks). > arm64 will convert to the common versions in a future patch. > > Implement the necessary arm64 arch hooks now to avoid having to provide > stubs or a temporary #define (from x86) to avoid arm64 compilation errors > when CONFIG_GUEST_PERF_EVENTS=y. > > Signed-off-by: Sean Christopherson <seanjc@google.com> > --- > arch/arm64/include/asm/kvm_host.h | 8 +++++ > arch/arm64/kvm/arm.c | 5 +++ > arch/x86/include/asm/kvm_host.h | 3 ++ > arch/x86/kvm/x86.c | 53 +++++++------------------------ > include/linux/kvm_host.h | 10 ++++++ > virt/kvm/kvm_main.c | 44 +++++++++++++++++++++++++ > 6 files changed, 81 insertions(+), 42 deletions(-) > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > index ed940aec89e0..828b6eaa2c56 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -673,6 +673,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); > void kvm_perf_init(void); > void kvm_perf_teardown(void); > > +#ifdef CONFIG_GUEST_PERF_EVENTS > +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) > +{ > + /* Any callback while a vCPU is loaded is considered to be in guest. */ > + return !!vcpu; > +} > +#endif > + > 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 e9a2b8f27792..2b542fdc237e 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -500,6 +500,11 @@ 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 2d86a2dfc775..6efe4e03a6d2 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -1543,6 +1543,9 @@ 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 412646b973bb..1bea616402e6 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -8264,43 +8264,12 @@ 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); > @@ -8309,12 +8278,6 @@ 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) > { > @@ -11068,9 +11031,11 @@ 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; > @@ -11099,8 +11064,7 @@ 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)(); > } > @@ -11727,6 +11691,11 @@ 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 e4d712e9f760..b9255a6439f2 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -1163,6 +1163,16 @@ 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 3e67c93ca403..179fb110a00f 100644 > --- a/virt/kvm/kvm_main.c > +++ b/virt/kvm/kvm_main.c > @@ -5460,6 +5460,50 @@ 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; > Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
On Wed, 22 Sep 2021 01:05:29 +0100, Sean Christopherson <seanjc@google.com> wrote: > > Move x86's perf guest callbacks into common KVM, as they are semantically > identical to arm64's callbacks (the only other such KVM callbacks). > arm64 will convert to the common versions in a future patch. > > Implement the necessary arm64 arch hooks now to avoid having to provide > stubs or a temporary #define (from x86) to avoid arm64 compilation errors > when CONFIG_GUEST_PERF_EVENTS=y. > > Signed-off-by: Sean Christopherson <seanjc@google.com> > --- > arch/arm64/include/asm/kvm_host.h | 8 +++++ > arch/arm64/kvm/arm.c | 5 +++ > arch/x86/include/asm/kvm_host.h | 3 ++ > arch/x86/kvm/x86.c | 53 +++++++------------------------ > include/linux/kvm_host.h | 10 ++++++ > virt/kvm/kvm_main.c | 44 +++++++++++++++++++++++++ > 6 files changed, 81 insertions(+), 42 deletions(-) > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > index ed940aec89e0..828b6eaa2c56 100644 > --- a/arch/arm64/include/asm/kvm_host.h > +++ b/arch/arm64/include/asm/kvm_host.h > @@ -673,6 +673,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); > void kvm_perf_init(void); > void kvm_perf_teardown(void); > > +#ifdef CONFIG_GUEST_PERF_EVENTS > +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) Pardon my x86 ignorance, what is PMI? PMU Interrupt? > +{ > + /* Any callback while a vCPU is loaded is considered to be in guest. */ > + return !!vcpu; > +} > +#endif Do you really need this #ifdef? > + > 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 e9a2b8f27792..2b542fdc237e 100644 > --- a/arch/arm64/kvm/arm.c > +++ b/arch/arm64/kvm/arm.c > @@ -500,6 +500,11 @@ 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) > { The above nits notwithstanding, Acked-by: Marc Zyngier <maz@kernel.org> M.
On Mon, Oct 11, 2021, Marc Zyngier wrote: > On Wed, 22 Sep 2021 01:05:29 +0100, Sean Christopherson <seanjc@google.com> wrote: > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > > index ed940aec89e0..828b6eaa2c56 100644 > > --- a/arch/arm64/include/asm/kvm_host.h > > +++ b/arch/arm64/include/asm/kvm_host.h > > @@ -673,6 +673,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); > > void kvm_perf_init(void); > > void kvm_perf_teardown(void); > > > > +#ifdef CONFIG_GUEST_PERF_EVENTS > > +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) > > Pardon my x86 ignorance, what is PMI? PMU Interrupt? Ya, Performance Monitoring Interrupt. I didn't realize the term wasn't common perf terminology. Maybe kvm_arch_perf_events_in_guest() to be less x86-centric? > > +{ > > + /* Any callback while a vCPU is loaded is considered to be in guest. */ > > + return !!vcpu; > > +} > > +#endif > > Do you really need this #ifdef? Nope, should compile fine without it, though simply dropping the #ifdef would make make the semantics of the function wrong, even if nothing consumes it. Tweak it to use IS_ENABLED()? return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu;
On Mon, 11 Oct 2021 15:46:25 +0100, Sean Christopherson <seanjc@google.com> wrote: > > On Mon, Oct 11, 2021, Marc Zyngier wrote: > > On Wed, 22 Sep 2021 01:05:29 +0100, Sean Christopherson <seanjc@google.com> wrote: > > > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h > > > index ed940aec89e0..828b6eaa2c56 100644 > > > --- a/arch/arm64/include/asm/kvm_host.h > > > +++ b/arch/arm64/include/asm/kvm_host.h > > > @@ -673,6 +673,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); > > > void kvm_perf_init(void); > > > void kvm_perf_teardown(void); > > > > > > +#ifdef CONFIG_GUEST_PERF_EVENTS > > > +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) > > > > Pardon my x86 ignorance, what is PMI? PMU Interrupt? > > Ya, Performance Monitoring Interrupt. I didn't realize the term wasn't > common perf terminology. Maybe kvm_arch_perf_events_in_guest() to be > less x86-centric? Up to you. I would be happy with just a comment. > > > > +{ > > > + /* Any callback while a vCPU is loaded is considered to be in guest. */ > > > + return !!vcpu; > > > +} > > > +#endif > > > > Do you really need this #ifdef? > > Nope, should compile fine without it, though simply dropping the #ifdef > would make make the semantics of the function wrong, even if nothing > consumes it. Tweak it to use IS_ENABLED()? > > return IS_ENABLED(CONFIG_GUEST_PERF_EVENTS) && !!vcpu; LGTM. M.
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index ed940aec89e0..828b6eaa2c56 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -673,6 +673,14 @@ int io_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa); void kvm_perf_init(void); void kvm_perf_teardown(void); +#ifdef CONFIG_GUEST_PERF_EVENTS +static inline bool kvm_arch_pmi_in_guest(struct kvm_vcpu *vcpu) +{ + /* Any callback while a vCPU is loaded is considered to be in guest. */ + return !!vcpu; +} +#endif + 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 e9a2b8f27792..2b542fdc237e 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -500,6 +500,11 @@ 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 2d86a2dfc775..6efe4e03a6d2 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1543,6 +1543,9 @@ 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 412646b973bb..1bea616402e6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8264,43 +8264,12 @@ 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); @@ -8309,12 +8278,6 @@ 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) { @@ -11068,9 +11031,11 @@ 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; @@ -11099,8 +11064,7 @@ 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)(); } @@ -11727,6 +11691,11 @@ 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 e4d712e9f760..b9255a6439f2 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -1163,6 +1163,16 @@ 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 3e67c93ca403..179fb110a00f 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -5460,6 +5460,50 @@ 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;
Move x86's perf guest callbacks into common KVM, as they are semantically identical to arm64's callbacks (the only other such KVM callbacks). arm64 will convert to the common versions in a future patch. Implement the necessary arm64 arch hooks now to avoid having to provide stubs or a temporary #define (from x86) to avoid arm64 compilation errors when CONFIG_GUEST_PERF_EVENTS=y. Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/arm64/include/asm/kvm_host.h | 8 +++++ arch/arm64/kvm/arm.c | 5 +++ arch/x86/include/asm/kvm_host.h | 3 ++ arch/x86/kvm/x86.c | 53 +++++++------------------------ include/linux/kvm_host.h | 10 ++++++ virt/kvm/kvm_main.c | 44 +++++++++++++++++++++++++ 6 files changed, 81 insertions(+), 42 deletions(-)