Re: [Xen-devel] PVH cleanups after 4.5

[Tim Deegan <tim@xxxxxxx>]

At 09:20 +0000 on 05 Dec (1417767654), Jan Beulich wrote:
> >>> On 04.12.14 at 18:25, <tim@xxxxxxx> wrote:
> > Potential feature flags, based on whiteboard notes at the session.
> > Things that are 'Yes' in both columns might not need actual flags :)
> > 
> >                      'HVM'       'PVH'
> > 64bit hypercalls      Yes         Yes
> > 32bit hypercalls      Yes         No
> 
> Iiuc the lack of support of 32-bit hypercalls is simply because PVH
> guests aren't expected to use them as being always 64-bit right
> now. I.e. I can't really see why we couldn't just enable them once
> the 64-bit hypercall tables got combined, in which case we wouldn't
> need a feature flag here either.

Agreed -- I think the same will apply to a few other things, like shadow
pagetables and some of the other MM tricks.  

Tim.

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