linux-kernel - [PATCH] KVM: VMX: align vmx->nested.nested_vmx_secondary_ctls_high to vmx->rdtscp

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Message-Id: <1442331304-29939-1-git-send-email-pbonzini@redhat.com>
Date:	Tue, 15 Sep 2015 17:35:04 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	guangrong.xiao@...ux.intel.com
Subject: [PATCH] KVM: VMX: align vmx->nested.nested_vmx_secondary_ctls_high to vmx->rdtscp_enabled

The SECONDARY_EXEC_RDTSCP must be available iff RDTSCP is enabled in the
guest.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/vmx.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4df94e2b7c23..fb7a35ad9b02 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8678,9 +8678,14 @@ static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
 					exec_control);
 		}
 
-		if (nested && !vmx->rdtscp_enabled)
-			vmx->nested.nested_vmx_secondary_ctls_high &=
-				~SECONDARY_EXEC_RDTSCP;
+		if (nested) {
+			if (vmx->rdtscp_enabled)
+				vmx->nested.nested_vmx_secondary_ctls_high |=
+					SECONDARY_EXEC_RDTSCP;
+			else
+				vmx->nested.nested_vmx_secondary_ctls_high &=
+					~SECONDARY_EXEC_RDTSCP;
+		}
 	}
 
 	/* Exposing INVPCID only when PCID is exposed */
-- 
1.8.3.1

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