1 files changed, 54 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3c4ca98ad27f..dd9bc8fb81ab 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
@@ -1712,6 +1713,7 @@ static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
         if (copy_from_user(cpuid_entries, entries,
                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
                 goto out_free;
+        vcpu_load(vcpu);
         for (i = 0; i < cpuid->nent; i++) {
                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
@@ -1729,6 +1731,7 @@ static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
         r = 0;
         kvm_apic_set_version(vcpu);
         kvm_x86_ops->cpuid_update(vcpu);
+        vcpu_put(vcpu);
 
 out_free:
         vfree(cpuid_entries);
@@ -1749,9 +1752,11 @@ static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
                 goto out;
+        vcpu_load(vcpu);
         vcpu->arch.cpuid_nent = cpuid->nent;
         kvm_apic_set_version(vcpu);
         kvm_x86_ops->cpuid_update(vcpu);
+        vcpu_put(vcpu);
         return 0;
 
 out:
@@ -3743,6 +3748,51 @@ 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;
@@ -3779,6 +3829,8 @@ int kvm_arch_init(void *opaque)
 
         kvm_timer_init();
 
+        perf_register_guest_info_callbacks(&kvm_guest_cbs);
+
         return 0;
 
 out:
@@ -3787,6 +3839,8 @@ 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);