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

[Avi Kivity]

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.

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