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Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_S
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net |
Date: |
Sat, 23 Jun 2018 00:47:33 +0300 |
On Fri, Jun 22, 2018 at 12:43:26PM -0700, Siwei Liu wrote:
> > The semantics are that the primary is always used if present in
> > preference to standby.
> OK. If this is the only semantics of what "standby" refers to in
> general, that is fine.
>
> I just don't want to limit the failover/standby semantics to the
> device model specifics, the "accelerated datapath" thing or whatever.
> I really don't know where the requirements of the "accelerated
> datapath" came from,
It's a way to put it that matches what failover actually provides.
> as the originial problem is migrating vfio
> devices which is in match of QEMU's live migration model.
If you put it this way then it's natural to require that we have a
config with a working vfio device, and that we somehow add virtio for
duration of migration.
> Hyper-V has
> it's limitation to do 1-netdev should not impact how KVM/QEMU should
> be doing it.
That's a linux thing and pretty orthogonal to host/guest interface.
> > Jason said virtio net is sometimes preferable.
> > If that's the case don't make it a standby.
> >
> > More advanced use-cases do exist and e.g. Alexander Duyck
> > suggested using a switch-dev.
>
> The switchdev case would need a new feature bit, right?
>
> -Siwei
I think it would need to be a completely new device.
> > failover isn't it though.
> >
> > --
> > MST
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, (continued)
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Jason Wang, 2018/06/12
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Samudrala, Sridhar, 2018/06/13
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Jason Wang, 2018/06/13
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/21
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/21
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/21
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/22
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/22
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/22
Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/11
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Jason Wang, 2018/06/11
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/11
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Samudrala, Sridhar, 2018/06/12
- Re: [Qemu-devel] [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/12
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Samudrala, Sridhar, 2018/06/12
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/13
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Cornelia Huck, 2018/06/14