From: Juergen Gross <jgross@suse.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>,
linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org
Subject: Re: [PATCH 2/4] xen: limit grant v2 interface to the v1 functionality
Date: Tue, 12 Sep 2017 17:50:27 +0200 [thread overview]
Message-ID: <8c87dc06-bbc8-5279-d135-d3351032913d@suse.com> (raw)
In-Reply-To: <f9cc6652-c524-bf4f-73f0-494d16deedf0@oracle.com>
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?
Juergen
next prev parent reply other threads:[~2017-09-12 15:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-08 14:48 [PATCH 0/4] xen: grant table interface v2 support Juergen Gross
2017-09-08 14:48 ` [PATCH 1/4] xen: re-introduce support for grant v2 interface Juergen Gross
2017-09-12 15:41 ` [Xen-devel] " Boris Ostrovsky
2017-09-12 15:45 ` Juergen Gross
2017-09-08 14:48 ` [PATCH 2/4] xen: limit grant v2 interface to the v1 functionality Juergen Gross
2017-09-12 15:44 ` Boris Ostrovsky
2017-09-12 15:50 ` Juergen Gross [this message]
2017-09-12 16:05 ` Boris Ostrovsky
2017-09-12 16:09 ` Juergen Gross
2017-09-12 16:21 ` Boris Ostrovsky
2017-09-12 18:18 ` Juergen Gross
2017-09-13 13:22 ` Boris Ostrovsky
2017-09-13 13:38 ` Juergen Gross
2017-09-13 13:50 ` Boris Ostrovsky
2017-09-13 14:45 ` Juergen Gross
2017-09-13 16:20 ` Boris Ostrovsky
2017-09-14 8:13 ` Juergen Gross
2017-09-08 14:48 ` [PATCH 3/4] xen: add grant interface version dependent constants to gnttab_ops Juergen Gross
2017-09-12 16:02 ` Boris Ostrovsky
2017-09-08 14:48 ` [PATCH 4/4] xen: select grant interface version Juergen Gross
2017-09-12 16:21 ` [Xen-devel] " Boris Ostrovsky
2017-09-12 18:54 ` Andrew Cooper
2017-09-13 9:23 ` Juergen Gross
2017-09-15 13:00 ` Juergen Gross
2017-09-15 13:21 ` Jan Beulich
[not found] ` <59BBEFFC020000780017B8EF@suse.com>
2017-09-15 13:27 ` Juergen Gross
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