linux-kernel - Re: [Xen-devel] [PATCH] xen PVonHVM: require at least Xen 3.4 as dom0

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Message-ID: <20121031102128.GA8912@reaktio.net>
Date:	Wed, 31 Oct 2012 12:21:28 +0200
From:	Pasi Kärkkäinen <pasik@....fi>
To:	Olaf Hering <olaf@...fle.de>
Cc:	Ian Campbell <ian.campbell@...rix.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [Xen-devel] [PATCH] xen PVonHVM: require at least Xen 3.4 as
 dom0

On Wed, Oct 31, 2012 at 10:29:25AM +0100, Olaf Hering wrote:
> On Wed, Oct 31, Ian Campbell wrote:
> 
> > If I understand correctly this requirements comes from the need to
> > support moving the shared info page in order to support kexec?
> > 
> > So could we do something more fine grained and limit only the kexec
> > support (and therefore the movement of the SI into that range) to 3.4+?
> 
> Its not strictly about kexec. The other patch I sent out will place the
> shared info page at 0xFE700000. If that range is not within a
> E820_Reserved area and if the old hvmloader makes allocations within
> that range, that other patch needs to be changed so that the shared info
> page is done either at 0xFE700000 or within RESERVE_BRK (as it is done
> currently).
> 
> Is the source code of that old RHEL available somewhere, did they patch
> hvmloader at all? Providing a E820 map from a guest which was started on
> such old dom0 would be a good start.
> 

http://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/xen-3.0.3-135.el5_8.5.src.rpm
That's the userland, actual Xen hypervisor is in the kernel src.rpm.

I can provide a dmesg from a guest later today.

-- Pasi

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