KVM: SVM: do not allow VMRUN inside SMM

VMRUN is not supported inside the SMM handler and the behavior is undefined.
Just raise a #UD.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 6ea047e..a7c3b30 100644 (file)
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -345,8 +345,12 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
        struct kvm_host_map map;
        u64 vmcb_gpa;
 
-       vmcb_gpa = svm->vmcb->save.rax;
+       if (is_smm(&svm->vcpu)) {
+               kvm_queue_exception(&svm->vcpu, UD_VECTOR);
+               return 1;
+       }
 
+       vmcb_gpa = svm->vmcb->save.rax;
        ret = kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb_gpa), &map);
        if (ret == -EINVAL) {
                kvm_inject_gp(&svm->vcpu, 0);