Re: [PATCH 2/4] xen: limit grant v2 interface to the v1 functionality

[Boris Ostrovsky]

On 09/12/2017 11:50 AM, Juergen Gross wrote:
> On 12/09/17 17:44, Boris Ostrovsky wrote:
>> On 09/08/2017 10:48 AM, Juergen Gross wrote:
>>> As there is currently no user for sub-page grants or transient grants
>>> remove that functionality. This at once makes it possible to switch
>>> from grant v2 to grant v1 without restrictions, as there is no loss of
>>> functionality other than the limited frame number width related to
>>> the switch.
>> But isn't that ABI violation? v2 is expected to support this (XSAs
>> notwithstanding)
> No, I don't think so.
>
> The hypervisor still supports it, but the domU (or dom0) isn't required
> to make use of all the features IMHO. Or are you aware of any backend
> querying the grant version of a frontend and acting in another way if v2
> is detected?

I am not aware of any but that doesn't mean that they don't (or won't)
exist.

-boris