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

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Message-ID: <1341931594.8586.44.camel@hastur.hellion.org.uk>
Date:	Tue, 10 Jul 2012 08:46:34 -0600
From:	Ian Campbell <ian.campbell@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Olaf Hering <olaf@...fle.de>, Daniel Kiper <dkiper@...-space.pl>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jan Beulich <JBeulich@...e.com>
Subject: Re: [Xen-devel] incorrect layout of globals from head_64.S during
 kexec boot

On Tue, 2012-07-10 at 10:14 -0400, Konrad Rzeszutek Wilk wrote:
> Which brings me to another question - say we do use this patch, what
> if the decompressor overwrites the old kernels .data section. Won't
> we run into this problem again?

I've not really been following this thread that closely but wouldn't the
right answer be for the original kernel to unmap the shared info on
kexec? Or maybe remap it up to some high/reserved address? Can it read
the original address used by hvmloader at start of day and reuse that?

Ian.


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