From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: [PATCH] KVM: nSVM: check for EFER.SVME=1 before entering guest
Date: Wed, 18 Mar 2020 13:41:40 +0100 [thread overview]
Message-ID: <1584535300-6571-1-git-send-email-pbonzini@redhat.com> (raw)
EFER is set for L2 using svm_set_efer, which hardcodes EFER_SVME to 1 and hides
an incorrect value for EFER.SVME in the L1 VMCB. Perform the check manually
to detect invalid guest state.
Reported-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/svm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 08568ae9f7a1..2125c6ae5951 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3558,6 +3558,9 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
static bool nested_vmcb_checks(struct vmcb *vmcb)
{
+ if ((vmcb->save.efer & EFER_SVME) == 0)
+ return false;
+
if ((vmcb->control.intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
return false;
--
1.8.3.1
next reply other threads:[~2020-03-18 12:41 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 12:41 Paolo Bonzini [this message]
2020-03-18 14:53 ` [PATCH] KVM: nSVM: check for EFER.SVME=1 before entering guest Vitaly Kuznetsov
2020-03-18 18:40 ` Krish Sadhukhan
2020-03-19 10:05 ` Paolo Bonzini
2020-03-19 18:56 ` Krish Sadhukhan
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