Re: Xen + linux 6.1.0-rc8, network to guest VM not working after commit ad7f402ae4f466647c3a669b8a6f3e5d4271c84a fixing XSA-423

[Andrew Cooper]

On 07/12/2022 21:42, Sander Eikelenboom wrote:
> Hi Ross / Juergen,
>
> I just updated my linux kernel to the latest of Linus his tree which
> included commit ad7f402ae4f466647c3a669b8a6f3e5d4271c84a fixing XSA-423.
>
> Unfortunately when using this kernel I can't SSH anymore into the Xen
> guest I start, but I don't see any apparent failures either.
> A straight revert of the commit
> ad7f402ae4f466647c3a669b8a6f3e5d4271c84a makes networking function
> normally again.
>
> I have added some of the logging below, perhaps it at gives some idea
> off the state around the Xen network front and backend.
>
> Any ideas or a test patch that I could run to shed some more light on
> what is going on ?

XSA-423 was buggy.  Fix and discussion at:

https://lore.kernel.org/xen-devel/681773dd-6264-63ac-a3b5-a9182b9e0cc1@xxxxxxxx/T/#t

~Andrew