If cpuvendor string is not filetered in case of host
amd machine we get unhandled msr reads
| [1709265.368464] kvm: 25706: cpu6 unhandled rdmsr: 0xc0010048
| [1709265.397161] kvm: 25706: cpu7 unhandled rdmsr: 0xc0010048
| [1709265.425774] kvm: 25706: cpu8 unhandled rdmsr: 0xc0010048
thus provide own string and kernel will use generic cpu init.
Reported-by: Ingo Molnar <mingo@xxxxxxxxxx>
CC: Pekka Enberg <penberg@xxxxxxxxxx>
CC: Sasha Levin <sasha.levin@xxxxxxxxxx>
CC: Asias He <asias@xxxxxxxxxx>
Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
---
tools/kvm/x86/cpuid.c | 8 ++++++++
1 file changed, 8 insertions(+)
Index: linux-2.6.git/tools/kvm/x86/cpuid.c
===================================================================
--- linux-2.6.git.orig/tools/kvm/x86/cpuid.c
+++ linux-2.6.git/tools/kvm/x86/cpuid.c
@@ -12,6 +12,7 @@
static void filter_cpuid(struct kvm_cpuid2 *kvm_cpuid)
{
+ unsigned int signature[3];
unsigned int i;
/*
@@ -21,6 +22,13 @@ static void filter_cpuid(struct kvm_cpui
struct kvm_cpuid_entry2 *entry = &kvm_cpuid->entries[i];
switch (entry->function) {
+ case 0:
+ /* Vendor name */
+ memcpy(signature, "LKVMLKVMLKVM", 12);
+ entry->ebx = signature[0];
+ entry->ecx = signature[1];
+ entry->edx = signature[2];
+ break;
case 1:
/* Set X86_FEATURE_HYPERVISOR */
if (entry->index == 0)
--
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