Re: [RFC PATCH 4/5] APIC/IOAPIC EOI callback

Alex Williamson
2010-07-11T18:26:27Z

On Sun, 2010-07-11 at 21:14 +0300, Avi Kivity wrote:
> On 07/11/2010 09:09 PM, Alex Williamson wrote:
> > For device assignment, we need to know when the VM writes an end
> > of interrupt to the APIC, which allows us to de-assert the interrupt
> > line and clear the DisINTx bit. Add a new wrapper for ioapic
> > generated interrupts with a callback on eoi and create an interface
> > for drivers to be notified on eoi.
> >
>
> You aren't going to get this with kvm's in-kernel irqchip, so we need a
> new interface there.

Registering an eventfd for the eoi seems like a reasonable alternative.
I also need to figure out how to avoid bouncing the vfio interrupt
events through qemu, but it's a functional start. Thanks,

Alex