Re: Linux PV/PVH domU crash on (guest) resume from suspend

[Jürgen Groß <jgross@xxxxxxxx>]

On 17.02.21 14:48, Marek Marczykowski-Górecki wrote:
> On Wed, Feb 17, 2021 at 07:51:42AM +0100, Jürgen Groß wrote:
> > On 17.02.21 06:12, Marek Marczykowski-Górecki wrote:
> > > Hi,
> > >
> > > I'm observing Linux PV/PVH guest crash when I resume it from sleep. I do
> > > this with:
> > >
> > >       virsh -c xen dompmsuspend <vmname> mem
> > >       virsh -c xen dompmwakeup <vmname>
> > >
> > > But it's possible to trigger it with plain xl too:
> > >
> > >       xl save -c <vmname> <some-file>
> > >
> > > The same on HVM works fine.
> > >
> > > This is on Xen 4.14.1, and with guest kernel 5.4.90, the same happens
> > > with 5.4.98. Dom0 kernel is the same, but I'm not sure if that's
> > > relevant here. I can reliably reproduce it.
> > This is already on my list of issues to look at.
> >
> > The problem seems to be related to the XSA-332 patches. You could try
> > the patches I've sent out recently addressing other fallout from XSA-332
> > which _might_ fix this issue, too:
> >
> > https://patchew.org/Xen/20210211101616.13788-1-jgross@xxxxxxxx/
> Thanks for the patches. Sadly it doesn't change anything - I get exactly
> the same crash. I applied that on top of 5.11-rc7 (that's what I had
> handy). If you think there may be a difference with the final 5.11 or
> another branch, please let me know.
Some more tests reveal that this seems to be s hypervisor regression.
I can reproduce the very same problem with a 4.12 kernel from 2019.

It seems as if the EVTCHNOP_init_control hypercall is returning
-EINVAL when the domain is continuing to run after the suspend
hypercall (in contrast to the case where a new domain has been created
when doing a "xl restore").


Juergen

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