[Qemu-devel] Re: [PATCH v3 1/1] Shared memory uio_pci driver

[Avi Kivity]

On 03/25/2010 06:40 PM, Michael S. Tsirkin wrote:
> On Thu, Mar 25, 2010 at 06:32:15PM +0200, Avi Kivity wrote:
>    
> > On 03/25/2010 06:23 PM, Anthony Liguori wrote:
> >      
> > > > There has been previous discussion of virtio, however while virtio is
> > > > good for exporting guest memory, it's not ideal for importing memory
> > > > into a guest.
> > > >          
> > > virtio is a DMA-based API which means that it doesn't assume cache
> > > coherent shared memory.  The PCI transport takes advantage of cache
> > > coherent shared memory but it's not strictly required.
> > >        
> > Aren't we violating this by not using dma_alloc_coherent() for the queues?
> >      
> I don't see what changing this would buys us though, unless
> a non-cache coherent architecture implements kvm.
>    

We're preventing people from implementing virtio devices in hardware, 
not that anyone's doing that.

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