Re: BHYVE_SNAPSHOT

o_O

--
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info

On Sun, Apr 30, 2023, 23:42 Matthew Grooms <mgrooms@shrew.net> wrote:

> On 4/29/23 06:17, void wrote:
> > Hi,
> >
> > Where can I read up about the recently introduced BHYVE_SNAPSHOT ?
> >
> > I can only find terse information about what it does (in man 5 src.conf)
> > but not about how to use it and/or why.
>
> This began as sponsored student work with the Politehnica University of
> Bucharest back in 2016 with an eye toward developing Live MIgration as a
> feature. The initial bhyve save/restore patch was committed back in 2020
> ...
>
> https://reviews.freebsd.org/rS360648
>
> Student projects related to bhyve continued until last year, but we gave
> up due to there being such a massive accumulation of patches with no
> path to getting them committed. We tried reaching out to project
> maintainers and the FreeBSD foundation alike for support and feedback,
> but there seems to be little to no interest. There have also been
> attempts by companies that rely on these features to and get them
> improved and committed. Unfortunately they don't appear to be having
> much luck either ...
>
> https://reviews.freebsd.org/D38858#885651
>
> Would you like to see support for VM snapshots in the generic kernel?
> How about support for saving/restore checkpoints using QCOW2, VMDK via
> libvdsk? How about support for warm or live migration? How about USB
> device pass-through? There are experimental patches for all these
> features that were developed by students at UPB. In a lot of cases,
> there are open reviews that have been waiting on feedback for ages. Here
> is a a presentation given by Elena from UPB just last month at the
> FreeBSD devsumit in Tokyo ...
>
>
> https://wiki.freebsd.org/DevSummit/202303?action=AttachFile&do=view&target=Presentation+-+bhyvecon.pdf
>
> The case is quite plain. I'm not sure what the solution is to this
> problem. I'd love to hear feedback from the community about how I've got
> this completely wrong and how the course could be corrected. That would
> be something.
>
> -Matthew
>
>
>
>