linux-kernel - Re: [Xen-devel] [PATCH v4] xen PVonHVM: move shared

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Message-ID: <20121030170321.GA1251@aepfle.de>
Date:	Tue, 30 Oct 2012 18:03:21 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Jan Beulich <JBeulich@...e.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel <xen-devel@...ts.xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] [PATCH v4] xen PVonHVM: move shared_info to reserved
 memory area

On Tue, Oct 30, Jan Beulich wrote:

> And iirc you're doing this relocation because otherwise the newly
> booting kernel image may get overwritten at an (from its
> perspective) arbitrary location. What I'm trying to point out is
> that the shared info structure is not the only thing (potentially)
> inside the kernel image that might get overwritten - the relocated
> (by the old kernel) vCPU info may as well. Plus I think the new
> kernel has no way of relocating it a second time (including back
> into the shared info structure) with how the hypervisor works at
> present.

Thanks, I have not looked at this, nor was I aware of it until now.
I will see what needs to be done.

Is this also an issue with the xenlinux based PVonHVM code?


Olaf
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