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

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Thu, Sep 13, 2012 at 5:14 PM, Keir Fraser <keir@xxxxxxx> wrote:
> On 13/09/2012 21:43, "Konrad Rzeszutek Wilk" <konrad@xxxxxxxxxx> wrote:
>
>>> Auto-translated PV seems to be one of those unsupported things that never
>>> quite dies. With PVH just round the corner, let's definitively call it dead.
>>> :)
>>
>> I thought we discussed that we need this as backup for running older guests?
>
> 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.
>
>> BTW, the auto-xlat is what PVH is advertising to the PV guest.
>
> Yes, but it's auto-xlat in an HVM container. Pure PV auto-xlat is what we're
> looking to kill here.
>
>  -- Keir
>
>> CC-ing Mukesh here
>
>
>
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