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KVM guest: make kvm_para_available() check hypervisor bit reading cpuid leaf 

This cpuid range does not exist on real HW and Intel spec says that
"Information returned for highest basic information leaf" will be
returned. Not very well defined.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Gleb Natapov 2012-04-30 14:45:49 +03:00 committed by Avi Kivity
parent 57c22e5f35
commit 9b72d3b07d
1 changed files with 9 additions and 7 deletions
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16
arch/x86/include/asm/kvm_para.h
View File

@ -178,14 +178,16 @@ static inline int kvm_para_available(void)
unsigned int eax, ebx, ecx, edx;
char signature[13];
cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
memcpy(signature + 0, &ebx, 4);
memcpy(signature + 4, &ecx, 4);
memcpy(signature + 8, &edx, 4);
signature[12] = 0;
if (cpu_has_hypervisor) {
cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
memcpy(signature + 0, &ebx, 4);
memcpy(signature + 4, &ecx, 4);
memcpy(signature + 8, &edx, 4);
signature[12] = 0;
if (strcmp(signature, "KVMKVMKVM") == 0)
return 1;
if (strcmp(signature, "KVMKVMKVM") == 0)
return 1;
}
return 0;
}