Re: nmi is broken?

[Avi Kivity <avi@redhat.com>]

On 05/03/2011 08:45 PM, OGAWA Hirofumi wrote:
> Avi Kivity<avi@redhat.com>  writes:
>
> >  On 05/03/2011 07:57 PM, OGAWA Hirofumi wrote:
> >>  >
> >>  >   Usually yes, but we already have the PIT wired to INTIN0.  I saw that
> >>  >   the kernel consults the mptable to see which pin to use, so with the
> >>  >   right BIOS magic we can get things to work.
> >>
> >>  Um..., I'm confused more. If so, MADT doesn't say it. MADT says irq == 0
> >>  is pin == 2, this is one of reasons why linux is quite silent in
> >>  check_timer(). And I can't see why it is working by pin == 2 for IOAPIC.
> >>
> >>  If I can make time, I'll see what happens by pin == 2 and pin == 0 of
> >>  IOAPIC in kvm.
> >
> >  You're right.  The default routing is INTIN0, but qemu changes it to
> >  INTIN2 and tells kvm.
> >
> >  So INTIN0 is free for the 8259A output.
>
> I see. Did it mean qemu changes the wiring, so kvm can't work for live
> migration with it?

qemu changes the wiring, but it does so on both the migration source and 
the migration target (before either is launched), so they are migration 
compatible.

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