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

["Jürgen Groß" <jgross@suse.com>]

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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@suse.com/
> 
> 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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