[vfio-users] OVMF and Windows hibernation

[Patrick O'Callaghan]

On Thu, 2017-09-14 at 20:24 +0200, Laszlo Ersek wrote:
> On 09/14/17 17:01, Patrick O'Callaghan wrote:
> > I'm interested in getting hibernation or Fast Boot working on my
> > Windows 10 VM, however on trying to enable it using "powercfg" I get
> > the message "The system firmware does not support hibernation". I'm
> > using OVMF (edk2-ovmf-20170209git296153c5-3.fc26.noarch).
> > 
> > Can I do anything about this?
> 
> You shouldn't try.
> 
> 
> * OVMF supports S3 ("suspend to RAM", "sleep").
> 
> In order for Windows to go to sleep (i.e., offer to go into ACPI S3
> power state), QEMU has to be configured correctly (with upstream QEMU,
> nothing should be done for that, S3 is enabled by default). Furthermore,
> all OS drivers, in particular the video driver, has to support S3. If
> you use the QXL WDDM driver (and only QXL cards), then S3 should work
> reliably.
> 
> If you use an assigned GPU (with its matching OS-level vendor driver),
> then it might or might not work. I don't have the slightest clue.
> 
> 
> * OVMF does not support S4 ("suspend to disk", "hibernation", "fast
> boot") at this time.
> 
> Even if you could convince Windows to hibernate, your next boot-up
> wouldn't be clean.
> 
> We did some work on a prerequisite feature
> <https://bugzilla.tianocore.org/show_bug.cgi?id=386>, but no approach
> was found that satisfied all OVMF maintainers. So this has been stuck
> for a while.
> 
> (But, even if S4 worked with a VM using only emulated devices, I
> couldn't guess if it worked when using an assigned device.)

Thanks for the reply. I'm only casually interested in getting this to
work so from what you say it looks like a non-starter for the time
being.

Regards

poc