Re: [Xen-devel] PVH PCI passthrough for DomUs

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Jan 27, 2020 at 12:27:18PM +0000, Wei Liu wrote:
> Cc Roger

Thanks :).

> On Sun, Jan 19, 2020 at 11:30:42PM -0800, Roman Shaposhnik wrote:
> > Hi!
> > 
> > I've just tried this with Xen 4.13.0 and it seems like that is still
> > not supported.

No, there hasn't been much progress on this sadly.

> > This makes me curious if anybody is working on this and whether
> > there's anything we can do to help accelerate the effort.

The first step would be to get vPCI hooked into the ioreq machinery,
so that a domain can have devices on the emulated PCI bus handled by
vPCI while others are handled by external ioreq emulators. I've posted
a v3 of this work on September:

https://lists.xenproject.org/archives/html/xen-devel/2019-09/msg03278.html

But I haven't got time to go over the comments and post a new version.

Once that's done the remaining step would be to make vPCI safe for
unprivileged guests. We need to assure that guests can only write to
specific bits of the config space, and need to limit the capabilities
that are exposed to the ones Xen knows to be safe to handle. This can
be worked by multiple people concurrently IMO, but requires step 1
(integration with ioreq) to be finished first.

I'm more than happy for someone to pick any of those tasks, including
the integration of vPCI with the ioreq machinery. If not, I expect I
will be able to do some work on this in a couple of weeks, but that
depends on nothing else getting on fire, and me being able to flush my
queue of pending patches.

Would you be up to pick some of these tasks?

I can try to speedup the vPCI ioreq integration if there's people
willing to work on the remaining steps, I haven't done so because I
didn't see much interest in general, and I was expecting to be the
only one working on the remaining steps anyway.

Regards, Roger.

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