Re: [PATCH 0/8] Virtio-over-PCIe on non-MIC

Vincent Whitchurch
2019-01-17T15:32:14Z

On Thu, Jan 17, 2019 at 07:21:42AM -0800, Christoph Hellwig wrote:
> On Thu, Jan 17, 2019 at 04:19:06PM +0100, Vincent Whitchurch wrote:
> > On the RC, a vop-host-backend driver (PCI driver) sets up some shared
> > memory area which the RC and the endpoint can use to communicate the
> > location of the MIC device descriptors and other information such as the
> > MSI address. It implements vop callbacks to allow the vop framework to
> > obtain the address of the MIC descriptors and send/receive interrupts
> > to/from the guest.
>
> Why would we require any work on the RC / host side? A properly
> setup software controlled virtio device should just show up as a
> normal PCIe device, and the virtio-pci device should bind to it.

If I understand you correctly, I think you're talking about the RC
running the virtio drivers and the endpoint implementing the virtio
device? This vop stuff is used for the other way around: the virtio
device is implement on the RC and the endpoint runs the virtio drivers.