On 07/19/2013 05:10 AM, Paolo Bonzini wrote:
>> +
>> +static inline bool kvm_para_available(void)
>> +{
>> if (boot_cpu_data.cpuid_level < 0)
>> return false; /* So we don't blow up on old processors */
>>
>> 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)
>> + if (kvm_para_available_function(KVM_CPUID_SIGNATURE) ||
>> + kvm_para_available_function(KVM_CPUID_SIGNATURE_NEXT))
>> return true;
>> }
>
> Nice catch. Just one small thing, you should loop until 0x40010000, as
> done in arch/x86/include/asm/xen/hypervisor.h, in case one day a third
> hypervisor implements three extensions (Hyper-V, KVM and its own set).
>
Any way we can centralize this stuff?
-hpa
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