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Date: Mon, 25 Jan 2010 22:05:00 +0100
From: Jes Sorensen <Jes.Sorensen@redhat.com>
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Subject: [Qemu-devel] Re: [PATCH] QEMU - provide e820 reserve through
	qemu_cfg
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Anthony Liguori <aliguori@us.ibm.com>, KVM General <kvm@vger.kernel.org>, Alexander Graf <agraf@suse.de>, QEMU Developers <qemu-devel@nongnu.org>, Kevin O'Connor <kevin@koconnor.net>, Avi Kivity <avi@redhat.com>

On 01/25/10 21:14, Anthony Liguori wrote:
> On 01/25/2010 02:04 PM, Alexander Graf wrote:
>> Yes, sounds good. Should be fairly extensible then. What about memory
>> holes? Do we need to take care of them?
>
> It would be nice for QEMU to be able to add additional e820 regions that
> don't necessarily fit the standard layout model.
>
> For instance, I've thought a number of times about using a large
> reserved region as a shared memory mechanism.
>
> But we certainly need to allow the BIOS to define the regions it needs
> to know about.

I think it should be easy to accommodate using the scheme I am
suggesting. It would require some basic testing for conflicts in the
BIOS, but otherwise it should pretty much allow you to specify any
region you want as a reserved block.

Only problem is that we don't really have a way to pass back info
saying 'you messed up trying to pinch an area that the BIOS wants
for itself'.

I'll take a look at it.

Cheers,
Jes