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 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?

Daniel

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