KVM: Implement perf callbacks for guest sampling

Below patch implements the perf_guest_info_callbacks on kvm.

Signed-off-by: Zhang Yanmin <yanmin_zhang@linux.intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 24cd0ee896e9..c3a33b2bb169 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -40,6 +40,7 @@
 #include <linux/user-return-notifier.h>
 #include <linux/srcu.h>
 #include <linux/slab.h>
+#include <linux/perf_event.h>
 #include <trace/events/kvm.h>
 #undef TRACE_INCLUDE_FILE
 #define CREATE_TRACE_POINTS
@@ -3765,6 +3766,47 @@ static void kvm_timer_init(void)
         }
 }
 
+static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
+
+static int kvm_is_in_guest(void)
+{
+        return percpu_read(current_vcpu) != NULL;
+}
+
+static int kvm_is_user_mode(void)
+{
+        int user_mode = 3;
+        if (percpu_read(current_vcpu))
+                user_mode = kvm_x86_ops->get_cpl(percpu_read(current_vcpu));
+        return user_mode != 0;
+}
+
+static unsigned long kvm_get_guest_ip(void)
+{
+        unsigned long ip = 0;
+        if (percpu_read(current_vcpu))
+                ip = kvm_rip_read(percpu_read(current_vcpu));
+        return ip;
+}
+
+static struct perf_guest_info_callbacks kvm_guest_cbs = {
+        .is_in_guest            = kvm_is_in_guest,
+        .is_user_mode           = kvm_is_user_mode,
+        .get_guest_ip           = kvm_get_guest_ip,
+};
+
+void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
+{
+        percpu_write(current_vcpu, vcpu);
+}
+EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
+
+void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
+{
+        percpu_write(current_vcpu, NULL);
+}
+EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
+
 int kvm_arch_init(void *opaque)
 {
         int r;
@@ -3801,6 +3843,8 @@ int kvm_arch_init(void *opaque)
 
         kvm_timer_init();
 
+        perf_register_guest_info_callbacks(&kvm_guest_cbs);
+
         return 0;
 
 out:
@@ -3809,6 +3853,8 @@ out:
 
 void kvm_arch_exit(void)
 {
+        perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
+
         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
                                             CPUFREQ_TRANSITION_NOTIFIER);