linux-kernel - Re: [PATCH 3.4 82/88] xen/setup: Populate freed MFNs from non-RAM E820 entries and gaps to E820 RAM

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Date:	Tue, 10 Jun 2014 14:18:16 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Daniel Kiper <daniel.kiper@...cle.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [PATCH 3.4 82/88] xen/setup: Populate freed MFNs from non-RAM
 E820 entries and gaps to E820 RAM

On 10/06/14 10:30, Daniel Kiper wrote:
> On Tue, Jun 10, 2014 at 10:07:27AM +0100, David Vrabel wrote:
>> On 10/06/14 01:25, Greg Kroah-Hartman wrote:
>>> 3.4-stable review patch.  If anyone has any objections, please let me know.
>>
>> This is a new feature and not a bug fix.  I don't think it (and patches
>> 83-85) are suitable for stable.
> 
> IIRC, this is the main patch fixing dom0 memory looses.
> Earlier patches are preparatory stuff and later ones are
> fixing bugs introduced by this patch and others. Konrad and I
> picked only minimal set of patches to fix that issue in 3.4.

This is not a bug fix.  dom0 was previously required to use the balloon
driver to recover memory freed during setup.  This was annoying but not
a bug.

This patches makes significant changes to how much memory dom0 ends up.
 Depending on hardware, the dom0_mem option, and the (non)use of the
balloon driver  applying this could result is between 1 - 3 GB of
additional memory allocated to dom0.  This could result in there being
insufficient host memory available to start a VM.

Please do not add to 3.4.y.

David
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