[PATCH] kvm: x86: ignore reads to perfctr msrs

From: Amit Shah <amit.shah@redhat.com>
To: avi@redhat.com
Cc: kvm@vger.kernel.org, Amit Shah <amit.shah@redhat.com>
Subject: [PATCH] kvm: x86: ignore reads to perfctr msrs
Date: Tue, 30 Jun 2009 16:24:28 +0530	[thread overview]
Message-ID: <1246359268-11327-1-git-send-email-amit.shah@redhat.com> (raw)

We ignore writes to the perfctr msrs. Ignore reads as well.

Kaspersky antivirus crashes Windows guests if it can't read
these MSRs.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 arch/x86/kvm/x86.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index af53f64..f358bb6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1045,9 +1045,12 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
 	case MSR_K8_SYSCFG:
 	case MSR_K7_HWCR:
 	case MSR_VM_HSAVE_PA:
+	case MSR_P6_PERFCTR0:
+	case MSR_P6_PERFCTR1:
 	case MSR_P6_EVNTSEL0:
 	case MSR_P6_EVNTSEL1:
 	case MSR_K7_EVNTSEL0:
+	case MSR_K7_PERFCTR0:
 	case MSR_K8_INT_PENDING_MSG:
 		data = 0;
 		break;
-- 
1.6.2.5

