Re: guest suspend/resume & virtio: vring errors

[Michael Tokarev <mjt@tls.msk.ru>]

09.07.2011 13:17, Gleb Natapov wrote:
> On Fri, Jul 08, 2011 at 11:02:54PM +0400, Michael Tokarev wrote:
>> I tried suspend/resume cycle for a linux guest
>> today, with 100% failure result.  There are 2
> Good. It works as expect :) Linux virtio drivers do not support PM.

This means that neither in-guest suspend/resume nor
qemu-kvm migrate-to-file (which fails for a different
reason I'm trying to debug now) works.  Which is very
unfortunate.

>> With e1000 instead of virtio-net-pci, the suspend
>> does not complete - guest kernel freezes after the
>> message "Suspending console(s)" and does not respond
>> (but does not eat 100% CPU either) - the same as for
>> older guest kernel.
>>
>> Has anyone succeeded suspend/resume cycle?
>>
> Yes, but Linux and suspend/resume are not best friends. Sometimes it
> works by mistake, but next merged patch fixes it and suspend/resume
> returns to its normal broken state.

Lovelylovely.

It does not work with any version of windows I tried, too
(which is winXP, win7 32 and win7 64bits).  Windows enters
an endless loop with a black screen during suspend (eating
100% CPU time).

What's wrong/broken in linux?  Can it be fixed?

Thanks,

/mjt