Re: [Qemu-devel] [PATCH] qemu: msi irq allocation api

[Paul Brook]

On Thursday 21 May 2009, Avi Kivity wrote:
> Paul Brook wrote:
> >>> which is a trivial wrapper around stl_phys.
> >>
> >> OK, but I'm adding another level of indirection in the middle,
> >> to allow us to tie in a kvm backend.
> >
> > kvm has no business messing with the PCI device code.
>
> kvm has a fast path for irq injection.  If qemu wants to support it we
> need some abstraction here.

Fast path from where to where? Having the PCI layer bypass/re-implement the 
APIC and inject the interrupt directly into the cpu core sounds a particularly 
bad idea.

Paul