Re: Linux PV domU with >1 vCPU never resumes after xl save/restore

["Jürgen Groß" <jgross@suse.com>]

[-- Attachment #1.1.1: Type: text/plain, Size: 932 bytes --]

On 04.08.26 10:02, Jan Beulich wrote:
> On 04.08.2026 08:12, George Dunlap wrote:
>> Saving and restoring a multi-vcpu PV guest appears to have been broken in
>> Linux for some time (observed 6.6.56 and 6.12.86).  Report below from
>> Claude Fable; I've independently verified the behavior on vanilla Linux
>> 6.6.56.  Claude seems to think it's a bug in Linux.
> 
> Just to double check, as there was a crucial fix there recently: This is with
> a Xen including bedbc17d8407 ("x86/domctl: restore all registers in
> arch_{get,set}_info_guest()")?

Thanks for bringing this up.

I just wanted to start investigation, as xl save/restore didn't work for me
either using an upstream 7.1 kernel.

Using an up-to-date Xen made the difference (I had a one month old Xen on my
test system for the initial test).


Juergen

P.S.: George, would it be possible to turn off HTML mails when sending to
       xen-devel?

[-- Attachment #1.1.2: OpenPGP public key --]
[-- Type: application/pgp-keys, Size: 3743 bytes --]

[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 495 bytes --]