Re: [virtio-comment] RE: [PATCH V2 3/6] virtio: dont reset vqs when SUSPEND

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Nov 21, 2023 at 03:33:07PM +0800, Jason Wang wrote:
> > Lingshan claimed that suspending device is for live migration in commit log and in discussion he portray it as some basic facility unrelated to device migration such as debug etc.
> > Instead of claiming it as some non_device_migration facility does not make sense.
> 
> It is used for migration for sure.

Well having a generic facility to stop device sounds like a nice thing.
However the devil is in the detail. A lot of detail here seems very much
tailored to a very specific implementation in mind.
So thinking through how it will work e.g. for power management
would be a good excercise to figure out how it should work in detail.
Parav did you indicate at some point a virtio specific SUSPEND
bit can be useful for PM? Could you share how it's better than
transport level PM and what the requirements are?
Thanks!

-- 
MST