KVM: SVM: Check for asid != 0 on nested vmrun

This patch lets a nested vmrun fail if the L1 hypervisor
left the asid zero. This fixes the asid_zero unit test.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index a0e5c7e26104..af5b9ea51965 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2019,6 +2019,9 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
         if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
                 return false;
 
+        if (vmcb->control.asid == 0)
+                return false;
+
         return true;
 }