FreeBSD/Xen suspend/resume

[Uni Gaia]

Does anyone know if suspend/resume works for a FreeBSD/Xen dom0 ? domU?

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[Uni Gaia]

On 1/20/19 11:21 AM, Pratyush Yadav wrote:
> Hey Uni,
>
> On 1/19/2019 4:59 AM, Uni Gaia wrote:
>> Does anyone know if suspend/resume works for a FreeBSD/Xen dom0 ? domU?
>
> I'm guessing by suspend/resume you mean xl save and xl restore. They
> work for FreeBSD domU (with Linux dom0), tested on 13-CURRENT r342020.
> I have not tested for FreeBSD as dom0 because I do not have it set up.

I am sorry, perhaps it wasn't clear enough.

I mean the domU successfully restoring (and obviously, suspending
properly in the first place) upon a dom0 suspend/resume cycle.

For instance, with QubesOS, which is Linux/Xen based, all virtual
machines resume working normally after suspending and resuming the machine.

I am considering FreeBSD for a home project, and it requires
virtualization (jails not enough).

Because it makes no sense to keep the machine on 24/7 in this scenario,
and because it would be cumbersome to shutdown the machine every night,
I am looking for the possibility of suspending/resuming.

I know this works with a Linux dom0 and at least Linux domUs.

My preference is FreeBSD dom0 and domUs.

But if FreeBSD dom0 fails to suspend/resume and domUs work, I might
consider (reluctantly) Linux for the dom0 role.
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[Roger Pau Monné]

On Sat, Jan 19, 2019 at 10:59:55AM +0000, Uni Gaia wrote:
> Does anyone know if suspend/resume works for a FreeBSD/Xen dom0 ? domU?

FreeBSD DomU does suspend and resume just fine, or else it's a bug and
should be fixed.

I think FreeBSD Dom0 suspend hasn't been tested (at least I haven't
tested it myself, neither seen any report on the list). That's mostly
because I work with servers. I'm happy to help with this or review
patches if someone wants to make it work.

Thanks, Roger.
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[Pratyush Yadav]

On Mon, 21 Jan 2019 at 12:07, Uni Gaia <[hidden email]> wrote:

>
> On 1/20/19 11:21 AM, Pratyush Yadav wrote:
> > Hey Uni,
> >
> > On 1/19/2019 4:59 AM, Uni Gaia wrote:
> >> Does anyone know if suspend/resume works for a FreeBSD/Xen dom0 ? domU?
> >
> > I'm guessing by suspend/resume you mean xl save and xl restore. They
> > work for FreeBSD domU (with Linux dom0), tested on 13-CURRENT r342020.
> > I have not tested for FreeBSD as dom0 because I do not have it set up.
>
> I am sorry, perhaps it wasn't clear enough.
>
> I mean the domU successfully restoring (and obviously, suspending
> properly in the first place) upon a dom0 suspend/resume cycle.
>
> For instance, with QubesOS, which is Linux/Xen based, all virtual
> machines resume working normally after suspending and resuming the machine.
>
> I am considering FreeBSD for a home project, and it requires
> virtualization (jails not enough).
>
> Because it makes no sense to keep the machine on 24/7 in this scenario,
> and because it would be cumbersome to shutdown the machine every night,
> I am looking for the possibility of suspending/resuming.
>
> I know this works with a Linux dom0 and at least Linux domUs.
>
> My preference is FreeBSD dom0 and domUs.
>
> But if FreeBSD dom0 fails to suspend/resume and domUs work, I might
> consider (reluctantly) Linux for the dom0 role.

AFAIK, FreeBSD does not support suspend/resume to disk at all [0], let
alone FreeBSD with Xen (someone correct me if I'm wrong). There is
support for suspending to RAM, but that is shaky from what I can
gather [1].

But you can look into Xen's save and restore features (xl save and xl
restore). They save/restore a domU to/from disk. So if in your setup
you can shut down your dom0, and saving states of domUs is enough, you
can set up a script to save your domUs to a file before shutdown and
get them running back up on boot.

Otherwise, you can look into bhyve, FreeBSD's virtualization solution.
I don't know if bhyve supports suspend and resuming of VMs, but you
can ask the folks at the freebsd-virtualization@ mailing list.



[0] https://wiki.freebsd.org/IdeasPage#Suspend_to_disk
[1] https://wiki.freebsd.org/SuspendResume

Regards,
Pratyush Yadav
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[Matthew Grooms]

On 1/21/2019 3:08 AM, Pratyush Yadav wrote:
> ...
> Otherwise, you can look into bhyve, FreeBSD's virtualization solution.
> I don't know if bhyve supports suspend and resuming of VMs, but you
> can ask the folks at the freebsd-virtualization@ mailing list.

Not at present. But, support for suspend, resume & migration is getting
closer every day ...

https://github.com/FreeBSD-UPB/freebsd/branches

-Matthew

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