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KVM: Move x86's perf guest info callbacks to generic KVM

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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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211111020738.2512932-13-seanjc@google.com
This commit is contained in:
Sean Christopherson 2021-11-11 02:07:33 +00:00 committed by Peter Zijlstra
parent db215756ae
commit e1bfc24577
6 changed files with 83 additions and 42 deletions
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10
arch/arm64/include/asm/kvm_host.h
View File

@ -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);

5
arch/arm64/kvm/arm.c
View File

@ -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)
{

3
arch/x86/include/asm/kvm_host.h
View File

@ -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);

53
arch/x86/kvm/x86.c
View File

@ -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;

10
include/linux/kvm_host.h
View File

@ -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);

44
virt/kvm/kvm_main.c
View File

@ -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;