Re: [Xen-devel] [PATCHv9 0/9] Xen: extend kexec hypercall for use with pv-ops kernels

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Mon, Oct 21, 2013 at 10:20:32PM +0200, Daniel Kiper wrote:
> On Mon, Oct 21, 2013 at 01:56:09PM +0100, David Vrabel wrote:
> > On 21/10/13 13:19, Daniel Kiper wrote:
> > > On Sat, Oct 19, 2013 at 12:14:24AM +0100, David Vrabel wrote:
> > >> On 18/10/2013 19:40, Daniel Kiper wrote:
> > >>> On Tue, Oct 08, 2013 at 05:55:01PM +0100, David Vrabel wrote:
> > >>>> The series (for Xen 4.4) improves the kexec hypercall by making Xen
> > >>>> responsible for loading and relocating the image.  This allows kexec
> > >>>> to be usable by pv-ops kernels and should allow kexec to be usable
> > >>>> from a HVM or PVH privileged domain.
> > >>>
> > >>> I could not load panic image because Xen crashes in following way:
> > >>>
> > >>> (XEN) ----[ Xen-4.4-unstable  x86_64  debug=y  Tainted:    C ]----
> > >> [...]
> > >>> (XEN) Xen call trace:
> > >>> (XEN)    [<ffff82d080114ef2>] kimage_free+0x67/0xd2
> > >>> (XEN)    [<ffff82d0801151f9>] do_kimage_alloc+0x29c/0x2f0
> > >>> (XEN)    [<ffff82d0801152fe>] kimage_alloc+0xb1/0xe6
> > >>> (XEN)    [<ffff82d0801144c0>] do_kexec_op_internal+0x68e/0x789
> > >>> (XEN)    [<ffff82d0801145c9>] do_kexec_op+0xe/0x12
> > >>> (XEN)    [<ffff82d0802268cb>] syscall_enter+0xeb/0x145
> > >>
> > >> The appended patch should fix this crash which only occurs if there's an
> > >> error in do_kimage_alloc().
> > >
> > > Patch had wrapped lines. I hope that I fixed it properly.
> > > I cannot load panic kernel. kexec fails with following message:
> > >
> > > kexec_load failed: Cannot assign requested address
> >
> > This is -EADDRINVALID which means one of
> >
> > a) the entry point isn't within a segment.
> > b) one of the segments is not page aligned.
> > c) one of the segments is not within the crash region.
> >
> > But the segments kexec has constructed all looked fine to me (and
> > similar to the segments I see).
> >
> > I'm afraid I cannot reproduce either of your failures.  Are you sure
> > you've built everything correctly?  In particular has kexec-tools been
> > built against the correct version of Xen headers?
>
> It looks that I build it correctly but I will double check it.
> Could you send me your Xen/Linux boot command lines and kexec
> command lines for normal and panic kernel? Could you tell me
> what is your RAM size?

Ping? This info will help me to dig deeper in this issue.

Daniel

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