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Date: Thu, 21 Jun 2018 16:59:13 +0200 From: Cornelia Huck <cohuck@...hat.com> To: "Michael S. Tsirkin" <mst@...hat.com> Cc: Siwei Liu <loseweigh@...il.com>, "Samudrala, Sridhar" <sridhar.samudrala@...el.com>, Alexander Duyck <alexander.h.duyck@...el.com>, virtio-dev@...ts.oasis-open.org, aaron.f.brown@...el.com, Jiri Pirko <jiri@...nulli.us>, Jakub Kicinski <kubakici@...pl>, Netdev <netdev@...r.kernel.org>, qemu-devel@...gnu.org, virtualization@...ts.linux-foundation.org, konrad.wilk@...cle.com, boris.ostrovsky@...cle.com, Joao Martins <joao.m.martins@...cle.com>, Venu Busireddy <venu.busireddy@...cle.com>, vijay.balakrishna@...cle.com Subject: Re: [virtio-dev] Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net On Wed, 20 Jun 2018 22:48:58 +0300 "Michael S. Tsirkin" <mst@...hat.com> 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, offer VIRTIO_NET_F_STANDBY_UUID if set - when configuring, set the property to the group UUID of the vfio-pci device - 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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