Re: [Xen-devel] [PATCH] nestedsvm: fix paging mode

[Christoph Egger <Christoph.Egger@xxxxxxx>]

On 09/27/12 16:53, Tim Deegan wrote:

> At 16:01 +0200 on 21 Sep (1348243291), Christoph Egger wrote:
>>
>> On VMRUN and VMEXIT emulation update the paging mode
>> for Shadow-on-Nested. This allows Xen to walk the
>> l1 hypervisors shadow page table correctly.
>> Problem found with 64bit Win7 and 32bit XPMode where
>> Win7 switches forth and back between long mode and
>> PAE legacy pagetables.
>>
>> Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
> 
> Don't you have to do this in other cases as well?  I think that
> shadow-on-shadow might need it, at least.


It is needed for all cases where the l1 guest does shadow paging.
This includes: Shadow-on-Nested and Shadow-on-Shadow.

Christoph


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