[PATCH 2/2] ignore reads from AMDs C1E enabled MSR

From: Andre Przywara <andre.przywara@amd.com>
To: avi@redhat.com
Cc: kvm@vger.kernel.org, Andre Przywara <andre.przywara@amd.com>
Subject: [PATCH 2/2] ignore reads from AMDs C1E enabled MSR
Date: Tue, 23 Jun 2009 00:20:44 +0200	[thread overview]
Message-ID: <1245709244-1000-1-git-send-email-andre.przywara@amd.com> (raw)

If the Linux kernel detects an C1E capable AMD processor (K8 RevF and
higher), it will access a certain MSR on every attempt to go to halt.
Explicitly handle this read and return 0 to let KVM run a Linux guest
with the native AMD host CPU propagated to the guest.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
---
 arch/x86/kvm/x86.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4c19c24..670a96d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1000,6 +1000,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_P6_EVNTSEL0:
 	case MSR_P6_EVNTSEL1:
 	case MSR_K7_EVNTSEL0:
+	case MSR_K8_INT_PENDING_MSG:
 		data = 0;
 		break;
 	case MSR_MTRRcap:
-- 
1.6.1.3


