Re: KVM call agenda for Jan 26

Anthony Liguori
2010-01-26T14:33:15Z

On 01/26/2010 08:26 AM, Avi Kivity wrote:
> On 01/26/2010 04:22 PM, Anthony Liguori wrote:
>> On 01/26/2010 08:15 AM, Avi Kivity wrote:
>>> On 01/26/2010 04:13 PM, Anthony Liguori wrote:
>>>>> Me too, especially as the whole stack is involved, and qemu is the
>>>>> topmost part from our perspective (no doubt libvirt will want to
>>>>> integrate that functionality as well).
>>>>
>>>>
>>>> I'm not sure I agree. It would use no code from qemu and really
>>>> benefit in no way from being part of qemu. I don't feel that
>>>> strongly about it though.
>>>>
>>>
>>> It would need to know which cpuid bits qemu supports. Only qemu
>>> knows that.
>>
>> I'm not sure I understand why. Can you elaborate?
>>
>
> If qemu doesn't recognize -cpu qemu64,+nx, then no amount of hardware
> and kvm.ko support will allow the user to enable nx in a guest.

Does -cpu host filter out flags that we don't know about? I'm pretty
sure it doesn't. Since we're planning on moving to -cpu host by default
for KVM, does it really matter?

Oh, I was under the impression that the tool was meant to be software
agnostic. IOW, here are all the virt features your hardware supports.

Regards,

Anthony Liguori