Re: [Xen-devel] "Iomem mapping not permitted" during windows crash dump under GPLPV

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 02/02/2010 11:27, "Jan Beulich" <JBeulich@xxxxxxxxxx> wrote:

>>>> "James Harper" <james.harper@xxxxxxxxxxxxxxxx> 02.02.10 12:07 >>>
>> Someone on the ntdev list suggested that one approach could be to
>> allocate a single page at setup time and map that into each 'hole' I
>> leave behind by ballooning pages out. I haven't checked if Xen supports
>> a HVM DomU randomly mapping pages like that and if it will let it map
>> the same page multiple times, but it would remove the errors and keep
>> everything happy.
> 
> There is no question - it just has to support this. Linux would not work
> without this (nor can I imagine any other OS would).

I don't think a page can be simultaneously mapped at multiple locations in a
guest's p2m though.

 -- Keir



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