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Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_S

From: Cornelia Huck
Subject: Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net
Date: Thu, 21 Jun 2018 16:59:13 +0200

On Wed, 20 Jun 2018 22:48:58 +0300
"Michael S. Tsirkin" <address@hidden> wrote:

> On Wed, Jun 20, 2018 at 06:06:19PM +0200, Cornelia Huck wrote:
> > In any case, I'm not sure anymore why we'd want the extra uuid.  
> It's mostly so we can have e.g. multiple devices with same MAC
> (which some people seem to want in order to then use
> then with different containers).
> But it is also handy for when you assign a PF, since then you
> can't set the MAC.

OK, so what about the following:

- introduce a new feature bit, VIRTIO_NET_F_STANDBY_UUID that indicates
  that we have a new uuid field in the virtio-net config space
- in QEMU, add a property for virtio-net that allows to specify a uuid,
- when configuring, set the property to the group UUID of the vfio-pci
- in the guest, use the uuid from the virtio-net device's config space
  if applicable; else, fall back to matching by MAC as done today

That should work for all virtio transports.

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