Re: [Xen-devel] [PATCH] x86: add feature flags to shared_info page

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 02/03/15 13:15, Jan Beulich wrote:
>>>> On 02.03.15 at 13:59, <"jgross@xxxxxxxx".non-mime.internet> wrote:
>> In order to indicate the Xen tools capability to support the virtual
>> mapped linear p2m list instead the 3 level mfn tree add feature flags
>> to the shared_info page.
> But why in the shared info page? They'd belong to start info or should
> be obtainable via XENVER_get_features.

Furthermore in this case, the virtual linear p2m is purely a
guest->toolstack feature/ABI.

Xen deliberately has no knowledge of PV guest p2ms of either the 3level
or linear variety.

Is there genuinely no better interface than the hypervisor feature flags
to indicate a piece of toolstack support?

~Andrew


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