Re: [Xen-devel] Xen PV PTE ABI (or lack thereof)

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 21/01/16 14:29, David Vrabel wrote:
> On 21/01/16 13:17, Andrew Cooper wrote:
>> As we see with the Protection Key feature, newer hardware feature start
>> using bits which were previously software available, and we absolutely
>> don't want to be in a position where our ABI prevents us from ever
>> supporting a new feature.
> I don't see a problem in not supporting new features in /PV/ guests.

I know you want to kill PV guests.  I am not going to deliberately
cripple PV guests in an attempt to achieve that goal.

>
> I think we should document the PV ABI as-is. i.e., that these two PTE
> bits are not available for PV guest use.

This is already known to break some guests.  It shouldn't stay as it
currently is.

~Andrew

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