Messages in this thread | | | Subject | Re: [PATCH 2/4] xen: limit grant v2 interface to the v1 functionality | From | Boris Ostrovsky <> | Date | Tue, 12 Sep 2017 12:05:57 -0400 |
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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
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