On 02/24/2010 09:13 AM, Anthony Liguori wrote:
to work on that if we can agree on what the underlying device looks
like whether it should be VirtIO or just PCI.
Agreed, you had suggested uio_pci for my PCI driver and I'd be happy
I feel pretty strongly that we shouldn't add shared memory to virtio.
I'm pretty sure Christian would too because it eliminates the
possibility of implementing a copy-based transport for virtio
(virtio-over-ethernet).
Actually, ignore my crazy justification based on virtio-over-ethernet :-)
Certain hypervisors (like Xen and PHYP) have very limited/non-existent
support for shared memory. In the case of Xen, there's a very small
pool that can be used for DMA buffers. In the case of PHYP, you have
hardware accelerated copying for all I/O.
Adding shared memory to virtio means that virtio could not be supported
(or at least, all virtio devices) on these hypervisors.
Regards,
Anthony Liguori
