From: "Durrant, Paul" <pdurrant@amazon.co.uk>
To: Jan Beulich <jbeulich@suse.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Julien Grall <julien@xen.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>
Subject: Re: [Xen-devel] [PATCH 2/2] domain: use PGC_extra domheap page for shared_info
Date: Wed, 26 Feb 2020 14:05:20 +0000 [thread overview]
Message-ID: <132bb159fcf049ae87e402537ccc7d2a@EX13D32EUC003.ant.amazon.com> (raw)
In-Reply-To: <2653c2cf-9add-dd0c-03e5-36d951ee621e@suse.com>
> -----Original Message-----
> From: Jan Beulich <jbeulich@suse.com>
> Sent: 26 February 2020 13:58
> To: Durrant, Paul <pdurrant@amazon.co.uk>
> Cc: xen-devel@lists.xenproject.org; Stefano Stabellini
> <sstabellini@kernel.org>; Julien Grall <julien@xen.org>; Volodymyr Babchuk
> <Volodymyr_Babchuk@epam.com>; Andrew Cooper <andrew.cooper3@citrix.com>;
> George Dunlap <george.dunlap@citrix.com>; Ian Jackson
> <ian.jackson@eu.citrix.com>; Konrad Rzeszutek Wilk
> <konrad.wilk@oracle.com>; Wei Liu <wl@xen.org>
> Subject: Re: [PATCH 2/2] domain: use PGC_extra domheap page for
> shared_info
>
> 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, and also allows a chunk of code to be removed from domain_relinquish_resoureses() (the shared xenheap walk which de-assigns them from the dying guest).
The only xenheap pages shared with a normal domU (as opposed to a system domain, which would be re-created on live update anyway) are AFAICT shared-info and grant table/status frames. This series deals with shared-info but I do have proto-patches for the grant table code too.
Paul
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next prev parent reply other threads:[~2020-02-26 14:05 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 [this message]
2020-02-26 15:23 ` Jan Beulich
2020-02-26 16:12 ` Julien Grall
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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