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From: Yu Zhang <yu.c.zhang@linux.intel.com>
To: Jan Beulich <JBeulich@suse.com>,
	George Dunlap <george.dunlap@eu.citrix.com>
Cc: Kevin Tian <kevin.tian@intel.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Tim Deegan <tim@xen.org>,
	George Dunlap <george.dunlap@citrix.com>,
	xen-devel@lists.xen.org, Paul Durrant <paul.durrant@citrix.com>,
	zhiyuan.lv@intel.com, JunNakajima <jun.nakajima@intel.com>
Subject: Re: [PATCH v4 3/3] x86/ioreq server: Add HVMOP to map guest ram with p2m_ioreq_server to an ioreq server.
Date: Tue, 21 Jun 2016 18:00:40 +0800	[thread overview]
Message-ID: <57691048.2060203@linux.intel.com> (raw)
In-Reply-To: <5769296002000078000F7250@prv-mh.provo.novell.com>



On 6/21/2016 5:47 PM, Jan Beulich wrote:
>> On 6/21/2016 4:22 PM, Jan Beulich wrote:
>>>
>>> Above modification would convert _all_ p2m_ioreq_server into
>>> p2m_ram_rw, irrespective of log-dirty mode being active. Which
>>> I don't think is what you want.
>> Well, this is another situation I found very interesting: without log-dirty,
>> this approach actually works. :)
> And what if the recalc flag gets set for some other reason?

Then the previous assumption will not hold. :)
But for now, the log dirty code is the only place I have found in 
hypervisor which
will turn on the recalc flag.

>>> I agree - this would seem to be the simpler model here, despite (as
>>> George validly says) the more consistent model would be for the
>>> hypervisor to do the cleanup. Such cleanup would imo be reasonable
>>> only if there was an easy way for the hypervisor to enumerate all
>>> p2m_ioreq_server pages.
>> Well, for me, the "easy way" means we should avoid traversing the whole ept
>> paging structure all at once, right?
> Yes.
>
>> I have not figured out any clean
>> solution
>> in hypervisor side, that's one reason I'd like to left this job to
>> device model
>> side(another reason is that I do think device model should take this
>> responsibility).
> Let's see if we can get George to agree.

OK. Thanks!

Yu

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  reply	other threads:[~2016-06-21 10:00 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-19  9:05 [PATCH v4 0/3] x86/ioreq server: Introduce HVMMEM_ioreq_server mem type Yu Zhang
2016-05-19  9:05 ` [PATCH v4 1/3] x86/ioreq server: Rename p2m_mmio_write_dm to p2m_ioreq_server Yu Zhang
2016-06-14 10:04   ` Jan Beulich
2016-06-14 13:14     ` George Dunlap
2016-06-15 10:51     ` Yu Zhang
2016-05-19  9:05 ` [PATCH v4 2/3] x86/ioreq server: Add new functions to get/set memory types Yu Zhang
2016-05-19  9:05 ` [PATCH v4 3/3] x86/ioreq server: Add HVMOP to map guest ram with p2m_ioreq_server to an ioreq server Yu Zhang
2016-06-14 10:45   ` Jan Beulich
2016-06-14 13:13     ` George Dunlap
2016-06-14 13:31       ` Jan Beulich
2016-06-15  9:50         ` George Dunlap
2016-06-15 10:21           ` Jan Beulich
2016-06-15 11:28             ` George Dunlap
2016-06-16  9:30             ` Yu Zhang
2016-06-16  9:55               ` Jan Beulich
2016-06-17 10:17                 ` George Dunlap
2016-06-20  9:03                   ` Yu Zhang
2016-06-20 10:10                     ` George Dunlap
2016-06-20 10:25                       ` Jan Beulich
2016-06-20 10:32                         ` George Dunlap
2016-06-20 10:55                           ` Jan Beulich
2016-06-20 11:28                             ` Yu Zhang
2016-06-20 13:13                               ` George Dunlap
2016-06-21  7:42                                 ` Yu Zhang
2016-06-20 10:30                       ` Yu Zhang
2016-06-20 10:43                         ` George Dunlap
2016-06-20 10:45                         ` Jan Beulich
2016-06-20 11:06                           ` Yu Zhang
2016-06-20 11:20                             ` Jan Beulich
2016-06-20 12:06                               ` Yu Zhang
2016-06-20 13:38                                 ` Jan Beulich
2016-06-21  7:45                                   ` Yu Zhang
2016-06-21  8:22                                     ` Jan Beulich
2016-06-21  9:16                                       ` Yu Zhang
2016-06-21  9:47                                         ` Jan Beulich
2016-06-21 10:00                                           ` Yu Zhang [this message]
2016-06-21 14:38                                           ` George Dunlap
2016-06-22  6:39                                             ` Jan Beulich
2016-06-22  8:38                                               ` Yu Zhang
2016-06-22  9:11                                                 ` Jan Beulich
2016-06-22  9:16                                               ` George Dunlap
2016-06-22  9:29                                                 ` Jan Beulich
2016-06-22  9:47                                                   ` George Dunlap
2016-06-22 10:07                                                     ` Yu Zhang
2016-06-22 11:33                                                       ` George Dunlap
2016-06-23  7:37                                                         ` Yu Zhang
2016-06-23 10:33                                                           ` George Dunlap
2016-06-24  4:16                                                             ` Yu Zhang
2016-06-24  6:12                                                               ` Jan Beulich
2016-06-24  7:12                                                                 ` Yu Zhang
2016-06-24  8:01                                                                   ` Jan Beulich
2016-06-24  9:57                                                                     ` Yu Zhang
2016-06-24 10:27                                                                       ` Jan Beulich
2016-06-22 10:10                                                     ` Jan Beulich
2016-06-22 10:15                                                       ` George Dunlap
2016-06-22 11:50                                                         ` Jan Beulich
2016-06-15 10:52     ` Yu Zhang
2016-06-15 12:26       ` Jan Beulich
2016-06-16  9:32         ` Yu Zhang
2016-06-16 10:02           ` Jan Beulich
2016-06-16 11:18             ` Yu Zhang
2016-06-16 12:43               ` Jan Beulich
2016-06-20  9:05             ` Yu Zhang
2016-06-14 13:14   ` George Dunlap
2016-05-27  7:52 ` [PATCH v4 0/3] x86/ioreq server: Introduce HVMMEM_ioreq_server mem type Zhang, Yu C
2016-05-27 10:00   ` Jan Beulich
2016-05-27  9:51     ` Zhang, Yu C
2016-05-27 10:02     ` George Dunlap

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