On 06/04/18 16:10, Boris Ostrovsky wrote:
> On 04/06/2018 09:33 AM, George Dunlap wrote:
>> On Fri, Apr 6, 2018 at 2:12 PM, Juergen Gross <jgr...@suse.com> wrote:
>>>
>>> So its time for a new XENFEAT_ value then? This would be the least
>>> intrusive way to add such a flag. Something like
>>> XENFEAT_linux_high_rsdp_address_okay ?
>> That sounds reasonable to me.  I'd personally make it something like
>> "reads_rsdp_from_start_info" or something, but the name doesn't matter
>> to me as much. :-)
>>
>> The other option would be to introduce a "max_pvh_interface_supported"
>> or something.  If it's not present (and it's a Linux kernel), default
>> it to '0', and have that mean "RSDP must be under 1MiB".
>>
>> That will allow us elbow-room in the future if we want to make other
>> breaking changes like this, without needing to keep a separate flag
>> around for each one indefinitely.
> 
> I slightly more prefer a per-feature bit. It is indeed somewhat more
> maintenance-heavy but is also more flexible.

+1


Juergen

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