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authorChris Lalancette <clalance@redhat.com>2008-06-20 09:51:30 +0200
committerAvi Kivity <avi@qumranet.com>2008-07-20 12:42:36 +0300
commitefa67e0d1f51842393606034051d805ab9948abd (patch)
tree9808aec9287308eef34ecce2a5a179cae776755d
parent65267ea1b3e768dc54b63cd7fad520d89c27d350 (diff)
downloadop-kernel-dev-efa67e0d1f51842393606034051d805ab9948abd.zip
op-kernel-dev-efa67e0d1f51842393606034051d805ab9948abd.tar.gz
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 <clalance@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--arch/x86/kvm/vmx.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6a3a403..d493a97 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);
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