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Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration
From: |
Michael S. Tsirkin |
Subject: |
Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration |
Date: |
Wed, 6 Oct 2021 08:18:06 -0400 |
On Wed, Oct 06, 2021 at 09:43:52AM +0100, Dr. David Alan Gilbert wrote:
> * Michael S. Tsirkin (mst@redhat.com) wrote:
> > On Wed, Oct 06, 2021 at 09:28:50AM +0100, Dr. David Alan Gilbert wrote:
> > > To me it feels the same as the distinction between vhost-kernel and qemu
> > > backended virtio that we get in net and others - in principal it's just
> > > another implementation.
> >
> > In net it's actually like this. Same -device, a different netdev.
> >
> > > A tricky part is guaranteeing the set of visible virtio features between
> > > implementations; we have that problem when we use vhost-kernel and run
> > > on a newer/older kernel and gain virtio features; the same will be true
> > > with vhost-user implementations.
> >
> > That's not new but yes we need to work on this.
> >
> > > But this would make the structure of a vhost-user implementation quite
> > > different.
> > >
> > > Dave
> >
> > Right. That's why I'm reluctant to just add a new device type that
> > has special compatibility requirements.
>
> Hmm but there's already another layer of hack^Wabstraction in there isn't
> there -
> there's already:
> virtio-blk-pci
> virtio-blk-device
>
> created when the user specifies a virtio-blk device?
>
> Dave
virtio-*-pci is there because it was felt these devices look
differently from e.g. virtio-ccw so should have a different name.
virtio-blk-device is an internal thingy, users and guests have no idea.
>
> > > >
> > > > > > --
> > > > > > MST
> > > > > >
> > > > > --
> > > > > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
> > > >
> > > --
> > > Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
> >
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, (continued)
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Roman Kagan, 2021/10/04
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Michael S. Tsirkin, 2021/10/05
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Dr. David Alan Gilbert, 2021/10/05
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Eduardo Habkost, 2021/10/05
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Michael S. Tsirkin, 2021/10/05
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Dr. David Alan Gilbert, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Michael S. Tsirkin, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Dr. David Alan Gilbert, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Michael S. Tsirkin, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Dr. David Alan Gilbert, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration,
Michael S. Tsirkin <=
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Dr. David Alan Gilbert, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Michael S. Tsirkin, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Dr. David Alan Gilbert, 2021/10/06
- Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration, Michael S. Tsirkin, 2021/10/06