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

[Daniel Kiper <daniel.kiper@xxxxxxxxxx>]

On Thu, Oct 31, 2013 at 11:21:48PM +0100, Daniel Kiper wrote:
> On Thu, Oct 31, 2013 at 06:30:32PM +0000, David Vrabel wrote:
> > On 31/10/2013 16:59, Don Slutz wrote:

[...]

> > > A possible fix is attached as (0002...) this does allow me to get into
> > > the crash kernel.
> >
> > Thanks for tracking this down. This should be fixed in the tools by
> > correctly aligning that segment.

With Don's patch (workaround) crash kernel works from time to time.
I hope that proper fix will solve this issue.

> I have rebuild all binaries and results are the same. Configuration
> changes does not help too. Don's patches solve some issues but dump
> system still does not load (I use Linux Kernel 3.10.17). I can see
> only following messages in all cases:
>
> I'm in purgatory
> early console in decompress_kernel

It looks that early VGA code touches VGA memory buffer (0xb8000).
When I mapped 0 - 1 MiB memory region (using machine_kexec_add_page()
in xen/arch/x86/machine_kexec.c:machine_kexec_load() everything
started working. So, sadly, I think we should map unconditionally
this memory region too.

Daniel

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