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Re: [Xen-devel] [PATCH 1/2] x86/xen: do not identity map UNUSABLE regions in the machine E820

On 16/08/13 16:23, Konrad Rzeszutek Wilk wrote:
> On Fri, Aug 16, 2013 at 03:42:55PM +0100, David Vrabel wrote:
>> From: David Vrabel <david.vrabel@xxxxxxxxxx>
>> If there are UNUSABLE regions in the machine memory map, dom0 will
>> attempt to map them 1:1 which is not permitted by Xen and the kernel
>> will crash.
>> There isn't anything interesting in the UNUSABLE region that the dom0
>> kernel needs access to so we can avoid making the 1:1 mapping and
>> treat it as RAM.
>> We only do this for dom0, as we do not expect any domU to ever have a
>> UNUSABLE region in their pseudo-physical map.
> Hm, you are going to be disappointed that this is in libxl:

The code is fine though since it only messes with UNUSABLE regions for
the initial domain. Feel free to fix up the comments and commit description.


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