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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: |
Wed, 20 Jun 2018 11:53:59 +0200 |
On Tue, 19 Jun 2018 23:32:06 +0300
"Michael S. Tsirkin" <address@hidden> wrote:
> On Tue, Jun 19, 2018 at 12:54:53PM +0200, Cornelia Huck wrote:
> > Sorry about dragging mainframes into this, but this will only work for
> > homogenous device coupling, not for heterogenous. Consider my vfio-pci
> > + virtio-net-ccw example again: The guest cannot find out that the two
> > belong together by checking some group ID, it has to either use the MAC
> > or some needs-to-be-architectured property.
> >
> > Alternatively, we could propose that mechanism as pci-only, which means
> > we can rely on mechanisms that won't necessarily work on non-pci
> > transports. (FWIW, I don't see a use case for using vfio-ccw to pass
> > through a network card anytime in the near future, due to the nature of
> > network cards currently in use on s390.)
>
> That's what it boils down to, yes. If there's need to have this for
> non-pci devices, then we should put it in config space.
> Cornelia, what do you think?
>
I think the only really useful config on s390 is the vfio-pci network
card coupled with a virtio-net-ccw device: Using an s390 network card
via vfio-ccw is out due to the nature of the s390 network cards, and
virtio-ccw is the default transport (virtio-pci is not supported on any
enterprise distro AFAIK).
For this, having a uuid in the config space could work (vfio-pci
devices have a config space by virtue of being pci devices, and
virtio-net-ccw devices have a config space by virtue of being virtio
devices -- ccw devices usually don't have that concept).
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, (continued)
- 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
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/14
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Cornelia Huck, 2018/06/15
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/15
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Cornelia Huck, 2018/06/19
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/19
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Cornelia Huck, 2018/06/20
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/20
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/19
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net,
Cornelia Huck <=
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/20
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Cornelia Huck, 2018/06/20
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Michael S. Tsirkin, 2018/06/20
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Cornelia Huck, 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, Cornelia Huck, 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] [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] [virtio-dev] Re: [PATCH] qemu: Introduce VIRTIO_NET_F_STANDBY feature bit to virtio_net, Siwei Liu, 2018/06/22