Re: Problem with KVM guest switching to x86 long mode

[Pekka Enberg <penberg@cs.helsinki.fi>]

Avi Kivity wrote:
> On 04/11/2010 01:02 PM, Pekka Enberg wrote:
>>> It should work without 80000008 set up - failure should happen only 
>>> if it is setup incorrectly:
>>>
>>> int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
>>> {
>>>     struct kvm_cpuid_entry2 *best;
>>>
>>>     best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
>>>     if (best)
>>>         return best->eax & 0xff;
>>>     return 36;
>>> }
>>
>>
>> Well, like I said, if I don't add an entry for it in struct kvm_cpuid2 
>> that's passed to KVM_SET_CPUID2 ioctl, I see a triple fault on Core 2 
>> Duo CPU that doesn't seem to have native 0x80000008.
> 
> Do you have a function 8, though?  Looks like a bug in kvm may confuse 
> the two.

Yeah, the host has function 8. I'm more than happy to test patches to 
fix the problem.

			Pekka