Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Michael S. Tsirkin
On Wed, Oct 06, 2021 at 03:27:59PM +0100, Dr. David Alan Gilbert wrote: > * Michael S. Tsirkin (m...@redhat.com) wrote: > > On Wed, Oct 06, 2021 at 02:29:37PM +0100, Dr. David Alan Gilbert wrote: > > > * Michael S. Tsirkin (m...@redhat.com) wrote: > > > > On Wed, Oct 06, 2021 at 09:43:52AM +0100,

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Dr. David Alan Gilbert
* Michael S. Tsirkin (m...@redhat.com) wrote: > On Wed, Oct 06, 2021 at 02:29:37PM +0100, Dr. David Alan Gilbert wrote: > > * Michael S. Tsirkin (m...@redhat.com) wrote: > > > On Wed, Oct 06, 2021 at 09:43:52AM +0100, Dr. David Alan Gilbert wrote: > > > > * Michael S. Tsirkin (m...@redhat.com)

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Michael S. Tsirkin
On Wed, Oct 06, 2021 at 02:29:37PM +0100, Dr. David Alan Gilbert wrote: > * Michael S. Tsirkin (m...@redhat.com) wrote: > > On Wed, Oct 06, 2021 at 09:43:52AM +0100, Dr. David Alan Gilbert wrote: > > > * Michael S. Tsirkin (m...@redhat.com) wrote: > > > > On Wed, Oct 06, 2021 at 09:28:50AM +0100,

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Dr. David Alan Gilbert
* Michael S. Tsirkin (m...@redhat.com) wrote: > On Wed, Oct 06, 2021 at 09:43:52AM +0100, Dr. David Alan Gilbert wrote: > > * Michael S. Tsirkin (m...@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

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Michael S. Tsirkin
On Wed, Oct 06, 2021 at 09:43:52AM +0100, Dr. David Alan Gilbert wrote: > * Michael S. Tsirkin (m...@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

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Dr. David Alan Gilbert
* Michael S. Tsirkin (m...@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

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Michael S. Tsirkin
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

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Dr. David Alan Gilbert
* Michael S. Tsirkin (m...@redhat.com) wrote: > On Wed, Oct 06, 2021 at 09:09:30AM +0100, Dr. David Alan Gilbert wrote: > > * Michael S. Tsirkin (m...@redhat.com) wrote: > > > On Tue, Oct 05, 2021 at 12:10:08PM -0400, Eduardo Habkost wrote: > > > > On Tue, Oct 05, 2021 at 03:01:05PM +0100, Dr.

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Michael S. Tsirkin
On Wed, Oct 06, 2021 at 09:09:30AM +0100, Dr. David Alan Gilbert wrote: > * Michael S. Tsirkin (m...@redhat.com) wrote: > > On Tue, Oct 05, 2021 at 12:10:08PM -0400, Eduardo Habkost wrote: > > > On Tue, Oct 05, 2021 at 03:01:05PM +0100, Dr. David Alan Gilbert wrote: > > > > * Michael S. Tsirkin

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-06 Thread Dr. David Alan Gilbert
* Michael S. Tsirkin (m...@redhat.com) wrote: > On Tue, Oct 05, 2021 at 12:10:08PM -0400, Eduardo Habkost wrote: > > On Tue, Oct 05, 2021 at 03:01:05PM +0100, Dr. David Alan Gilbert wrote: > > > * Michael S. Tsirkin (m...@redhat.com) wrote: > > > > On Tue, Oct 05, 2021 at 02:18:40AM +0300, Roman

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-05 Thread Michael S. Tsirkin
On Tue, Oct 05, 2021 at 12:10:08PM -0400, Eduardo Habkost wrote: > On Tue, Oct 05, 2021 at 03:01:05PM +0100, Dr. David Alan Gilbert wrote: > > * Michael S. Tsirkin (m...@redhat.com) wrote: > > > On Tue, Oct 05, 2021 at 02:18:40AM +0300, Roman Kagan wrote: > > > > On Mon, Oct 04, 2021 at 11:11:00AM

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-05 Thread Eduardo Habkost
On Tue, Oct 05, 2021 at 03:01:05PM +0100, Dr. David Alan Gilbert wrote: > * Michael S. Tsirkin (m...@redhat.com) wrote: > > On Tue, Oct 05, 2021 at 02:18:40AM +0300, Roman Kagan wrote: > > > On Mon, Oct 04, 2021 at 11:11:00AM -0400, Michael S. Tsirkin wrote: > > > > On Mon, Oct 04, 2021 at

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-05 Thread Dr. David Alan Gilbert
* Michael S. Tsirkin (m...@redhat.com) wrote: > On Tue, Oct 05, 2021 at 02:18:40AM +0300, Roman Kagan wrote: > > On Mon, Oct 04, 2021 at 11:11:00AM -0400, Michael S. Tsirkin wrote: > > > On Mon, Oct 04, 2021 at 06:07:29PM +0300, Denis Plotnikov wrote: > > > > It might be useful for the cases when

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-05 Thread Michael S. Tsirkin
On Tue, Oct 05, 2021 at 02:18:40AM +0300, Roman Kagan wrote: > On Mon, Oct 04, 2021 at 11:11:00AM -0400, Michael S. Tsirkin wrote: > > On Mon, Oct 04, 2021 at 06:07:29PM +0300, Denis Plotnikov wrote: > > > It might be useful for the cases when a slow block layer should be > > > replaced > > >

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-04 Thread Roman Kagan
On Mon, Oct 04, 2021 at 11:11:00AM -0400, Michael S. Tsirkin wrote: > On Mon, Oct 04, 2021 at 06:07:29PM +0300, Denis Plotnikov wrote: > > It might be useful for the cases when a slow block layer should be replaced > > with a more performant one on running VM without stopping, i.e. with very > >

Re: [PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-04 Thread Michael S. Tsirkin
On Mon, Oct 04, 2021 at 06:07:29PM +0300, Denis Plotnikov wrote: > It might be useful for the cases when a slow block layer should be replaced > with a more performant one on running VM without stopping, i.e. with very low > downtime comparable with the one on migration. > > It's possible to

[PATCH v0 0/2] virtio-blk and vhost-user-blk cross-device migration

2021-10-04 Thread Denis Plotnikov
It might be useful for the cases when a slow block layer should be replaced with a more performant one on running VM without stopping, i.e. with very low downtime comparable with the one on migration. It's possible to achive that for two reasons: 1.The VMStates of "virtio-blk" and