From: Joerg Roedel <joerg.roedel@amd.com>
Date: Mon, 2 Aug 2010 14:46:45 +0000 (+0200)
Subject: KVM: SVM: Check for asid != 0 on nested vmrun
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=dbe7758482a870f30a86bdeefebf4fc260afef11;p=openwrt%2Fstaging%2Fblogic.git

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>
---

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;
 }