Attached is a patch for fake emulating Intel perfctr MSRs, similar to the recent
patch to fake emulate the AMD perfctr MSRs. This is needed for a reason similar
for the previous patch; older linux guests (in this case, 2.6.9) can attempt to
access the MSR's without a fixup section, and injecting a GPF kills the guest.
Tested by me on RHEL-4 i386 and x86_64 guests, as well as F-9 guests.
Signed-off-by: Chris Lalancette <[EMAIL PROTECTED]>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index aaa99ed..f28789e 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -29,6 +29,7 @@
#include <asm/io.h>
#include <asm/desc.h>
+#include <asm/intel_arch_perfmon.h>
#define __ex(x) __kvm_handle_fault_on_reboot(x)
@@ -916,6 +917,18 @@ 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_ARCH_PERFMON_EVENTSEL0:
+ case MSR_ARCH_PERFMON_EVENTSEL1:
+ case MSR_ARCH_PERFMON_PERFCTR0:
+ case MSR_ARCH_PERFMON_PERFCTR1:
+ /*
+ * 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:
msr = find_msr_entry(vmx, msr_index);
if (msr) {
