From efa67e0d1f51842393606034051d805ab9948abd Mon Sep 17 00:00:00 2001 From: Chris Lalancette Date: Fri, 20 Jun 2008 09:51:30 +0200 Subject: [PATCH] KVM: VMX: Fake emulate Intel perfctr MSRs Older linux guests (in this case, 2.6.9) can attempt to access the performance counter MSRs without a fixup section, and injecting a GPF kills the guest. Work around by allowing the guest to write those MSRs. Tested by me on RHEL-4 i386 and x86_64 guests, as well as F-9 guests. Signed-off-by: Chris Lalancette Signed-off-by: Avi Kivity --- arch/x86/kvm/vmx.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 6a3a4038f3..d493a97e78 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -920,6 +920,18 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) break; case MSR_IA32_TIME_STAMP_COUNTER: guest_write_tsc(data); + break; + case MSR_P6_PERFCTR0: + case MSR_P6_PERFCTR1: + case MSR_P6_EVNTSEL0: + case MSR_P6_EVNTSEL1: + /* + * Just discard all writes to the performance counters; this + * should keep both older linux and windows 64-bit guests + * happy + */ + pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", msr_index, data); + break; default: vmx_load_host_state(vmx); -- 2.39.5