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

Arnd Bergmann
2019-01-17T16:34:30Z

On Thu, Jan 17, 2019 at 5:26 PM Vincent Whitchurch
<vincent.whitchurch@axis.com> wrote:
> On Thu, Jan 17, 2019 at 04:53:25PM +0100, Arnd Bergmann wrote:
> > On Thu, Jan 17, 2019 at 4:19 PM Vincent Whitchurch

> > Ok, this seems fine so far. So the vop-host-backend is a regular PCI
> > driver that implements the VOP protocol from the host side, and it
> > can talk to either a MIC, or another guest-backend written for the PCI-EP
> > framework to implement the same protocol, right?
>
> Yes, but just to clarify: the placement of the device page and the way
> to communicate the location of the device page address and any other
> information needed by the guest-backend are hardware-specific so there
> is no generic vop-host-backend implementation which can talk to both a
> MIC and to something else.

I'm not sure I understand what is hardware specific about it. Shouldn't
it be possible to define at least a vop-host-backend that could work with
any guest-backend running on the PCI-EP framework?

This may have to be different from the interface used on MIC, but
generally speaking that is what I expect from a PCI device.

Arnd