Re: [Qemu-devel] [RFC][PATCH 11/45] msi: Factor out delivery hook

[Avi Kivity]

On 10/17/2011 03:41 PM, Michael S. Tsirkin wrote:
> On Mon, Oct 17, 2011 at 01:15:56PM +0200, Jan Kiszka wrote:
> > On 2011-10-17 12:56, Avi Kivity wrote:
> > > On 10/17/2011 11:27 AM, Jan Kiszka wrote:
> > >> So far we deliver MSI messages by writing them into the target MMIO
> > >> area. This reflects what happens on hardware, but imposes some
> > >> limitations on the emulation when introducing KVM in-kernel irqchip
> > >> models. For those we will need to track the message origin.
> > > 
> > > Why do we need to track the message origin?  Emulated interrupt remapping?
> > 
> > The origin holds the routing cache which we need to track if the message
> > already has a route (and that without searching long lists) and to
> > update that route instead of add another one.
>
> Hmm, yes, but if the device does stl_phys or something like this,
> it won't work with irqchip, will it? And it should, ideally.

Why not?  it will fall back to the apic path, and use the local routing
cache entry there.

-- 
error compiling committee.c: too many arguments to function