Re: [Xen-devel] [PATCH] x86/mm: remove the linear mapping of the p2m tables

[Keir Fraser <keir@xxxxxxx>]

On 14/09/2012 21:31, "Konrad Rzeszutek Wilk" <konrad@xxxxxxxxxx> wrote:

>> Don't think so, since we'll continue to run old guests as pure PV.
>> 
>> There was a backup for running on older CPUs, and that was to allow PVH
>> guests to run on shadow page tables. That's a totally separate compatibility
>> concern however.
> 
> I am talking about the inverse. Running the "new" PV guests which do
> not have PV MMU
> enabled in them (since the PV MMU calls would not be necessary
> anymore) and running
> on non-NPT hardware.
> 
> For that PV auto-xlat would be necessary.

These 'new' PV guests are PVH guests. We're talking about removing PV
auto-xlat, not disallowing PVH auto-xlat. Subtle difference, but PVH will
always run in an HVM container.

 -- Keir



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