linux-kernel - Re: [Xen-devel] incorrect layout of globals from head

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Message-Id: <4FF6BDFB020000780008DFEF@nat28.tlf.novell.com>
Date:	Fri, 06 Jul 2012 09:29:15 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Olaf Hering" <olaf@...fle.de>
Cc:	<kexec@...ts.infradead.org>, <xen-devel@...ts.xensource.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S
 during kexec boot

>>> On 05.07.12 at 23:06, Olaf Hering <olaf@...fle.de> wrote:
> My question is: were to put additional debug to trace the copying of the
> data section to its final destination? Is this a task of kexec -l or
> does that happen during decompressing? I suspect the latter. This is the
> console output before the crash (the crash happens in 'movq %rax, %cr3'):
> 
> ...
> [   44.072548] Starting new kernel
> I'm in purgatory
> early console in decompress_kernel
> 
> Decompressing Linux... Parsing ELF... done.

According to this, I'd first of all extend the printing done on
arch/x86/boot/compressed/misc.c:parse_elf(). One possible
problem (without much looking at how the individual address
ranges get determined) could be overlapping memory ranges
in the call to memcpy() inside the loop.

Jan

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