[patch 2/2] tools: lkvm - Filter out cpu vendor string

[Cyrill Gorcunov <gorcunov@openvz.org>]

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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@kernel.org>
CC: Pekka Enberg <penberg@kernel.org>
CC: Sasha Levin <sasha.levin@oracle.com>
CC: Asias He <asias@redhat.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
---
 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)