Re: [Xen-devel] RFC: Nested VMX patch series 00

[Tim Deegan <Tim.Deegan@xxxxxxxxxx>]

At 12:34 +0200 on 01 Jun (1306931673), Christoph Egger wrote:
> On 06/01/11 12:15, Tim Deegan wrote:
> >At 11:56 +0200 on 01 Jun (1306929406), Christoph Egger wrote:
> >>On 06/01/11 06:11, Dong, Eddie wrote:
> >>>Keir/Tim:
> >>>   Here is the nested VMX support series for comments.
> >>>The current solution works with host shadow page table. The virtual EPT
> >>>support will come soon.
> >>
> >>I am surprised that shadow-on-shadow works w/o touching anything in
> >>xen/arch/x86/mm/*
> >
> >What do you think should break?  One major thing was that we didn't
> >properly report invalid PTE bits, but that's been fixed.
> 
> I thought some code to switch forth and back between two shadow page
> tables needs to be added at least (one to run l1 guest and one to
> run
> l2 guest).

No need - as long as the n1 guest provides valid pagetables (which may
themselves be shadows of n2 pagetables), all n0 has to do is shadow them
(again).

Cheers,

Tim.

-- 
Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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