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From: David Vrabel <david.vrabel@citrix.com>
To: Jennifer Herbert <Jennifer.Herbert@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	Jan Beulich <JBeulich@suse.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	dgdegra@tycho.nsa.gov, Wei Liu <wei.liu2@citrix.com>,
	George Dunlap <George.Dunlap@eu.citrix.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Tim Deegan <tim@xen.org>, David Vrabel <david.vrabel@citrix.com>,
	Anthony Perard <anthony.perard@citrix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel <xen-devel@lists.xenproject.org>
Subject: Re: Device model operation hypercall (DMOP, re qemu depriv)
Date: Fri, 9 Sep 2016 16:34:46 +0100	[thread overview]
Message-ID: <57D2D696.1010607@citrix.com> (raw)
In-Reply-To: <57D2D23E.9010601@citrix.com>

On 09/09/16 16:16, Jennifer Herbert wrote:
> On 01/08/16 12:32, Ian Jackson wrote:
>> I think we need to introduce a new hypercall (which I will call DMOP
>> for now) which may augment or replace some of HVMCTL.  Let me explain:
>>
> 
> I believe the new 'DMOP' hypercall is a good idea,  but following on
> from discussions, I propose a revised design, which I present below.
> Please let me know what you think.
> 
> Thanks,
> Jenny.
> 
> 
> DMOP  (multi-buffer variant)
> ============================
[...]
> Advantages of this system, over previouse DMOP proposals:
> 
> 
> *  The validation of address ranges is easily done by the privcmd driver,
>    using standard kernel mechanisms.  No need to get Xen thinking about
>    guest memory layout, which it should be independent of, and potentially
>    adding confusion.

+1.

The user address limit in Linux is a per-thread property, so trying to
pass this information to the hypervisor would require passing this
information in every dm_op, or switching the information on every task
switch.  The user address limit is also architecture specific, and would
require every arch to expose this via some new API.

David

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  reply	other threads:[~2016-09-09 15:34 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-28 17:01 XenProject/XenServer QEMU working group, Friday 8th July, 2016, 15:00 Jennifer Herbert
2016-08-01 11:32 ` Device model operation hypercall (DMOP, re qemu depriv) Ian Jackson
2016-08-01 12:41   ` Jan Beulich
2016-08-02 11:38     ` Wei Liu
2016-08-02 11:58       ` Jan Beulich
2016-08-02 13:02         ` David Vrabel
2016-08-02 13:29           ` Jan Beulich
2016-08-03 10:29       ` Ian Jackson
2016-08-03 12:03         ` Jan Beulich
2016-08-03 13:37           ` Ian Jackson
2016-08-03 14:16             ` Jan Beulich
2016-08-03 14:21               ` George Dunlap
2016-08-03 16:10                 ` Ian Jackson
2016-08-03 16:18                   ` Jan Beulich
2016-08-04 11:21                     ` Ian Jackson
2016-08-04 13:24                       ` Jan Beulich
2016-08-05 16:28                         ` Ian Jackson
2016-08-08 11:18                           ` Jan Beulich
2016-08-08 13:46                             ` Ian Jackson
2016-08-08 14:07                               ` Jan Beulich
2016-08-26 11:38                                 ` Ian Jackson
2016-08-26 12:58                                   ` Jan Beulich
2016-08-26 14:35                                     ` Ian Jackson
2016-08-26 15:13                                       ` Jan Beulich
2016-08-30 11:02                                         ` Ian Jackson
2016-08-30 21:47                                           ` Stefano Stabellini
2016-09-02 14:08                                           ` Wei Liu
2016-08-09 10:29                               ` Jan Beulich
2016-08-09 10:48                                 ` Ian Jackson
2016-08-09 11:30                                   ` Jan Beulich
2016-08-12  9:44                                     ` George Dunlap
2016-08-12 11:50                                       ` Jan Beulich
2016-08-15  9:39                                         ` George Dunlap
2016-08-15 10:19                                           ` Jan Beulich
2016-08-15 10:47                                             ` George Dunlap
2016-08-15 11:20                                               ` Jan Beulich
2016-08-15 12:07                                                 ` Ian Jackson
2016-08-15 14:20                                                   ` Jan Beulich
2016-08-15 14:57                                                 ` George Dunlap
2016-08-15 15:22                                                   ` Jan Beulich
2016-08-15 14:50                                 ` David Vrabel
2016-08-15 15:24                                   ` Jan Beulich
2016-08-26 11:29                                     ` Ian Jackson
2016-08-26 12:58                                       ` Jan Beulich
2016-08-02 11:37   ` Wei Liu
2016-08-02 11:42     ` George Dunlap
2016-08-02 12:34       ` Wei Liu
2016-09-09 15:16   ` Jennifer Herbert
2016-09-09 15:34     ` David Vrabel [this message]
2016-09-12 13:47     ` George Dunlap
2016-09-12 14:32     ` Jan Beulich
2016-09-13 10:37       ` George Dunlap
2016-09-13 11:53         ` Jan Beulich
2016-09-13 16:07       ` David Vrabel
2016-09-14  9:51         ` Jan Beulich
2016-09-21 11:21           ` Ian Jackson
2016-09-21 11:28             ` George Dunlap
2016-09-21 11:58               ` Jan Beulich
2016-09-21 11:55             ` Jan Beulich
2016-09-21 12:23               ` Device model operation hypercall (DMOP, re qemu depriv) [and 1 more messages] Ian Jackson
2016-09-21 12:48                 ` Jan Beulich
2016-09-21 13:24                   ` Ian Jackson
2016-09-21 13:56                     ` Jan Beulich
2016-09-21 15:06                       ` Ian Jackson
2016-09-21 17:09                       ` George Dunlap
2016-09-22  8:47                         ` Jan Beulich
2016-09-09 16:18 ` XenProject/XenServer QEMU working group minutes, 30th August 2016 Jennifer Herbert
2016-09-12  7:16   ` Juergen Gross
2016-10-14 18:01   ` QEMU XenServer/XenProject Working group meeting 29th September 2016 Jennifer Herbert
2016-10-18 19:54     ` Stefano Stabellini
2016-10-20 17:37       ` Lars Kurth
2016-10-20 18:53         ` Stefano Stabellini
2017-02-28 18:18     ` QEMU XenServer/XenProject Working group meeting 10th February 2017 Jennifer Herbert
2017-06-05 13:48       ` QEMU XenServer/XenProject Working group meeting 10th May 2017 Jennifer Herbert

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