Re: [Xen-users] Old computer stopped booting into xen starting with kernel 3.19

[Julien Grall <julien.grall@xxxxxxx>]

(CC Stefano)

Hello,

On 05/06/16 20:07, jim burns wrote:
> On Sat June 4 2016, 09:41:51 PM, jim burns wrote:
>
>  > On Fri June 3 2016, 09:39:54 PM, jim burns wrote:
>
>  > > Pls cc: me in any replies.
>
>  > >
>
>  > > On Sat May 21 2016, 11:41:27 PM, jim burns wrote:
>
>  > > > For kernels 3.19 - 4.2, the system won't boot into xen at all. In all
>
>  > > > cases,bare metal boots work fine.
>
>  > > >
>
>  > > > For kernels 4.3 - 4.6, and 4.7-rc, it gets more interesting, and I am
>
>  > > > able
>
>  > > > to provide a log (for 4.6). The system refuses to initialize my hard
>
>  > > > disk,
>
>  > > > and I am dumped into a rescue shell. I was able to initialze the
> http://lists.xenproject.org/archives/html/xen-devel/2016-06/msg00486.html
>  > > > network,
>
>  > > > and mount my Windows machine over cifs, so I could xfer the logs.
>
>  > > >
>
>  > > > I've played quite a bit with dracut's {add,force}_drivers+=
> parms, and
>
>  > > > the
>
>  > > > files in /usr/lib/modules-load.d, and currently load the following
>
>  > > > kernel
>
>  > > > modules, in the following order, to no effect. (I also don't remember
>
>  > > > the
>
>  > > > xen version for the last 4 years changing any of my results - 4.2 -
>
>  > > > 4.6.)
>
>  > >
>
>  > > Huh! I just installed kernel 4.5.6 today, and for the first time since
>
>  > > 3.18, I can boot into xen! Still can't boot into 4.5.5, or 4.6.0,
> and the
>
>  > > config files for 4.5.5 & 4.5.6 are identical, so I don't know what's
>
>  > > changed. I won't be losing the 4.5.6 rpms any time soon!
>
>  >
>
>  > Just installed 4.7rc1 today, and it boots into xen also (on my old
> machine).
>
>  > Haven't seen a version of 4.6 that will yet. I would love to know what
>
>  > changed in 4.7 (and possibly later 4.6 development) that probably was
> back
>
>  > ported between 4.5.5 and 4.5.6 that lets the latter boot into xen also.
>
> Hmm, according to the kernel changelog for 4.5.6 -
>
> https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.5.6
>
> The only xen related patch was:
>
> commit f21a3ff053d11bd9442b6ae7f51503bc5b373feb
>
> Author: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>
> Date: Wed Apr 20 14:15:01 2016 +0100
>
>
> xen/x86: actually allocate legacy interrupts on PV guests
>
> commit 702f926067d2a4b28c10a3c41a1172dd62d9e735 upstream.
>
> b4ff8389ed14 is incomplete: relies on nr_legacy_irqs() to get the number
>
> of legacy interrupts when actually nr_legacy_irqs() returns 0 after
>
> probe_8259A(). Use NR_IRQS_LEGACY instead.
>
> Signed-off-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>
> Since 4.5.5 and less, and 4.6.0 don't work for me, and this same patch shows
>
> up in the changelog for 4.6.1, if kernel 4.6.1 works for me, it may have
> to do with this patch.
Have you tried to revert this patch and see if it works?

Regards,

--
Julien Grall

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