Re: KVM handling external interrupts

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Jan Kiszka <jan.kiszka@xxxxxx> wrote on 07/06/2012 14:13:45:

> > Well, the shadow IDT only needs to be synced with interrupts coming
from
> > assigned devices. The rest of the entries doesn't matter, they just
> > generate an exception. Once they generate an exception, they are
delivered
> > through the host IDT. So, all you need to know are the vectors assigned
> > to the guest to build the shadow IDT.
>
> Not totally true. If the host decides to allocate some new vector that
> collides with some guest usage, you need to rearrange the shadow IDT and
> the physical IRQ routing. So you need to track what the host does.

Well, depends if you re-allocate the vector used by the guest or the vector
used by the host. Anyway, I think we understand each other :)

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