Re: [Xen-devel] [PATCH] support 1gb pages in guest page table walker

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> On 25.07.11 at 11:19, Christoph Egger <Christoph.Egger@xxxxxxx> wrote:
> On 07/22/11 17:43, Jan Beulich wrote:
>>>>> On 22.07.11 at 16:51, Christoph Egger<Christoph.Egger@xxxxxxx>  wrote:
>>> Support 1gb pages in guest page table walker.
>>
>> Why do you do this for GUEST_PAGING_LEVELS>= 3 rather than
>> GUEST_PAGING_LEVELS>= 4?
> 
> Xen can run in 32bit PAE mode but the guest in 64bit mode.

But that is what distinguishes GUEST_PAGING_LEVELS from
CONFIG_PAGING_LEVELS - you're allowing a PAE *guest* to use
1Gb mappings, no matter what host it runs on.

Jan

> We can still change this when 32bit support is actually dropped.
> 
> Christoph
> 





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