From: Julien Grall <julien@xen.org>
To: Jan Beulich <jbeulich@suse.com>, "Durrant, Paul" <pdurrant@amazon.co.uk>
Cc: Stefano Stabellini <sstabellini@kernel.org>, Wei Liu <wl@xen.org>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
Ian Jackson <ian.jackson@eu.citrix.com>,
George Dunlap <george.dunlap@citrix.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
"Woodhouse, David" <dwmw@amazon.co.uk>
Subject: Re: [Xen-devel] [PATCH 2/2] domain: use PGC_extra domheap page for shared_info
Date: Wed, 26 Feb 2020 16:12:21 +0000 [thread overview]
Message-ID: <f361c33b-1fdd-d296-edb3-3dbe8d0bc18b@xen.org> (raw)
In-Reply-To: <b9bb89e1-1490-c3e6-11b6-f6944750a791@suse.com>
(+David)
On 26/02/2020 15:23, Jan Beulich wrote:
> On 26.02.2020 15:05, Durrant, Paul wrote:
>>> From: Jan Beulich <jbeulich@suse.com>
>>> Sent: 26 February 2020 13:58
>>>
>>> On 25.02.2020 10:53, Paul Durrant wrote:
>>>> There's no particular reason shared_info need use a xenheap page. It's
>>>> only purpose is to be mapped by the guest so use a PGC_extra domheap
>>> page
>>>> instead.
>>>
>>> Since the cover letter also doesn't give any background - is there a
>>> problem with the current arrangements? Are there any further plans
>>> depending on this being changed? Or is this simply "let's do it
>>> because now we can"?
>>>
>>
>> The general direction is to get rid of shared xenheap pages. Knowing
>> that a xenheap page is not shared with a guest makes dealing with
>> live update much easier,
>
> I may not be seeing enough of the overall picture, but it would seem
> to me that the special treatment of shared Xen heap pages would then
> be replaced by special treatment of PGC_extra ones.
I have been working on Liveupdate for the past couple months and I don't
really see how this is going to make liveupdate easier. We will still
need to save the extra flags and extra records for each subsystem using
them (e.g grant-tables).
I have CCed David to see if he has a different opinion.
Cheers,
--
Julien Grall
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next prev parent reply other threads:[~2020-02-26 16:12 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-25 9:53 [Xen-devel] [PATCH 0/2] remove one more shared xenheap page: shared_info Paul Durrant
2020-02-25 9:53 ` [Xen-devel] [PATCH 1/2] domain: introduce alloc/free_shared_info() helpers Paul Durrant
2020-02-26 8:03 ` Julien Grall
2020-02-25 9:53 ` [Xen-devel] [PATCH 2/2] domain: use PGC_extra domheap page for shared_info Paul Durrant
2020-02-26 11:33 ` Julien Grall
2020-02-26 11:43 ` Jan Beulich
2020-02-26 12:03 ` Durrant, Paul
2020-02-26 14:22 ` Julien Grall
2020-02-26 14:44 ` Jan Beulich
2020-02-26 11:46 ` Andrew Cooper
2020-02-26 11:53 ` Durrant, Paul
2020-02-26 13:57 ` Jan Beulich
2020-02-26 14:05 ` Durrant, Paul
2020-02-26 15:23 ` Jan Beulich
2020-02-26 16:12 ` Julien Grall [this message]
2020-02-26 16:53 ` Woodhouse, David
2020-03-06 11:37 ` Jan Beulich
2020-03-06 11:52 ` David Woodhouse
2020-03-06 11:59 ` Durrant, Paul
2020-03-06 12:29 ` Jan Beulich
2020-03-06 12:49 ` David Woodhouse
2020-03-06 12:25 ` Jan Beulich
2020-03-06 12:37 ` David Woodhouse
2020-03-06 12:55 ` Jan Beulich
2020-03-06 13:08 ` David Woodhouse
2020-03-06 12:20 ` David Woodhouse
2020-03-06 12:36 ` Jan Beulich
2020-03-06 12:57 ` David Woodhouse
2020-03-06 13:10 ` Jan Beulich
2020-03-06 13:13 ` Paul Durrant
2020-03-06 13:23 ` Jan Beulich
2020-03-06 13:26 ` Paul Durrant
2020-03-06 13:36 ` Jan Beulich
2020-03-06 13:41 ` Paul Durrant
2020-03-06 13:46 ` Jan Beulich
2020-03-06 16:27 ` Paul Durrant
2020-03-06 17:16 ` Jan Beulich
2020-03-09 8:48 ` Paul Durrant
2020-03-09 8:54 ` Jan Beulich
2020-03-06 13:15 ` David Woodhouse
2020-03-06 13:22 ` [Xen-devel] [EXTERNAL][PATCH " Paul Durrant
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