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

[Avi Kivity]

Paul Brook wrote:
> 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.
>   

kvm implements the APIC in the host kernel (qemu upstream doesn't 
support this yet).  The fast path is wired to the in-kernel APIC, not 
the cpu core directly.

The idea is to wire it to UIO for device assignment, to a virtio-device 
implemented in the kernel, and to qemu.

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