Re: [PATCH v3] enable x2APIC without interrupt remapping under KVM

Avi Kivity
2009-06-30T17:11:58Z

On 06/30/2009 07:44 PM, Eric W. Biederman wrote:
>>> To support that seriously you need interrupt remapping.
>>>
>>>
>> Can you explain why?
>>
>
> Because ioapics don't fully function according to spec,
> and the interrupt code on the hotplug path is a horrible
> terrible broken hack for ioapics.
>
> It is better than nothing but it certainly is not something
> I would expect to work all of the time.
>

Can you elaborate? For kvm guests, the hardware is reasonably will
implemented and if not we will fix it. We need not cripple a feature
just because some hardware is broken.

--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.