Messages in this thread Patch in this message |  | | | From | Avi Kivity <> | | Subject | [PATCH 02/19] KVM: VMX: Fake emulate Intel perfctr MSRs | | Date | Tue, 15 Jul 2008 15:12:21 +0300 |
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From: Chris Lalancette <clalance@redhat.com>
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 <clalance@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com> --- arch/x86/kvm/vmx.c | 12 ++++++++++++ 1 files changed, 12 insertions(+), 0 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index d7522aa..ea6bcf5 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -921,6 +921,18 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) 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); msr = find_msr_entry(vmx, msr_index); -- 1.5.6.1
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