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-rw-r--r--virt/kvm/kvm_main.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6e8e9d36f382..504158f0e131 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -5603,6 +5603,50 @@ 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;