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

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Christoph Egger
> Sent: Wednesday, June 01, 2011 6:35 PM
> 
> 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).
> 
> Christoph
> 

as long as correctly emulating HOST_CR3 and GUEST_CR3 fields as L1 cr3 
switch action, you don't need any other special logic.

Thanks
Kevin

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