Re: [Bug Report] Linux v6.15-rc7 boot failure on Xen-4.17

[Jürgen Groß]

On 27.05.25 21:29, Andrew Cooper wrote:
> On 27/05/2025 8:21 pm, Xin Li wrote:
> > > On May 27, 2025, at 11:36 AM, Jürgen Groß <jgross@xxxxxxxx> wrote:
> > >
> > > On 27.05.25 19:54, Xin Li wrote:
> > > > On 5/27/2025 10:46 AM, Pawan Gupta wrote:
> > > > > > Attached is the serial console log and my kernel config.
> > > > > Serial logs aren't telling much. I do not have a Xen setup to test, without
> > > > > Xen the config that you provided is booting a KVM guest just fine.
> > > > Yeah, as I replied to Juergen, the same kernel binary boots fine as
> > > > "native".
> > > > Unfortunately when booting as dom0 on Xen, it keeps rebooting w/o
> > > > helpful log.
> > > What about booting Xen on bare metal, i.e. no KVM being involved?
> > The same exact problem happens on Intel Simics.  And I got to see it’s a NX page fault in dom0 kernel during apply alternatives.
>
> In which case it's likely that there's an opencoded PTE update, rather
> than using the hooks (which are suitably paravirt'd).

I'd suspect a bug when NOT using 2M pages for execmem.

I'll have a look.


Juergen

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