1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 095d673b9efb..af07cd539bba 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -73,6 +73,7 @@ static struct kvm_stats_debugfs_item {
         { "request_irq", STAT_OFFSET(request_irq_exits) },
         { "irq_exits", STAT_OFFSET(irq_exits) },
         { "light_exits", STAT_OFFSET(light_exits) },
+        { "efer_reload", STAT_OFFSET(efer_reload) },
         { NULL }
 };
 
@@ -2378,6 +2379,27 @@ out:
         return r;
 }
 
+static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
+{
+        u64 efer;
+        int i;
+        struct kvm_cpuid_entry *e, *entry;
+
+        rdmsrl(MSR_EFER, efer);
+        entry = NULL;
+        for (i = 0; i < vcpu->cpuid_nent; ++i) {
+                e = &vcpu->cpuid_entries[i];
+                if (e->function == 0x80000001) {
+                        entry = e;
+                        break;
+                }
+        }
+        if (entry && (entry->edx & EFER_NX) && !(efer & EFER_NX)) {
+                entry->edx &= ~(1 << 20);
+                printk(KERN_INFO ": guest NX capability removed\n");
+        }
+}
+
 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
                                     struct kvm_cpuid *cpuid,
                                     struct kvm_cpuid_entry __user *entries)
@@ -2392,6 +2414,7 @@ static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
                 goto out;
         vcpu->cpuid_nent = cpuid->nent;
+        cpuid_fix_nx_cap(vcpu);
         return 0;
 
 out: