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From: Stefano Stabellini <sstabellini@kernel.org>
To: Penny Zheng <Penny.Zheng@arm.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	 "xen-devel@lists.xenproject.org"
	<xen-devel@lists.xenproject.org>,  nd <nd@arm.com>,
	Penny Zheng <penzhe01@a011292.shanghai.arm.com>,
	 Julien Grall <julien@xen.org>,
	Bertrand Marquis <Bertrand.Marquis@arm.com>,
	 Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
	 Andrew Cooper <andrew.cooper3@citrix.com>,
	 George Dunlap <george.dunlap@citrix.com>,
	Jan Beulich <jbeulich@suse.com>,  Wei Liu <wl@xen.org>
Subject: RE: [PATCH v1 02/13] xen/arm: introduce a special domain DOMID_SHARED
Date: Fri, 18 Mar 2022 15:02:32 -0700 (PDT)	[thread overview]
Message-ID: <alpine.DEB.2.22.394.2203181459480.2910984@ubuntu-linux-20-04-desktop> (raw)
In-Reply-To: <DU2PR08MB7325E5A3B5A9BC5DA76692C4F7139@DU2PR08MB7325.eurprd08.prod.outlook.com>

On Fri, 18 Mar 2022, Penny Zheng wrote:
> > On Fri, 11 Mar 2022, Penny Zheng wrote:
> > > From: Penny Zheng <penzhe01@a011292.shanghai.arm.com>
> > >
> > > In case to own statically shared pages when owner domain is not
> > > explicitly defined, this commits propose a special domain
> > > DOMID_SHARED, and we assign it 0x7FF5, as one of the system domains.
> > >
> > > Statically shared memory reuses the same way of initialization with
> > > static memory, hence this commits proposes a new Kconfig
> > > CONFIG_STATIC_SHM to wrap related codes, and this option depends on
> > static memory(CONFIG_STATIC_MEMORY).
> > 
> > Why does it depend on CONFIG_STATIC_MEMORY? This is a genuine question,
> > I am not trying to scope-creep the series. Is there an actual technical
> > dependency on CONFIG_STATIC_MEMORY? If not, it would be super useful to
> > be able to share memory statically even between normal dom0less guests (of
> > course it would be responsibility of the user to provide the right addresses and
> > avoid mapping clashes.) I know that some of our users have requested this
> > feature in the past.
> > 
> 
> I may find a proper way to rephrase here. My poor English writing skill...
> When I implemented domain on static allocation, statically configured guest RAM is
> treated as static memory in Xen and I introduced a few helpers to initialize/allocate/free
> static memory, like acquire_staticmem_pages, etc, and all these helpers are guarded with
> CONFIG_STATIC_MEMORY. 
> I want to reuse these helpers on static shared memory, so CONFIG_STATIC_SHM depends
> on CONFIG_STATIC_MEMORY.
> 
> So I'm not restricting sharing static memory between domain on static allocation, current
> Implementation is also useful to normal dom0less guests.

Ah, excellent! That makes sense.


  reply	other threads:[~2022-03-18 22:02 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-11  6:11 [PATCH v1 00/13] Static shared memory on dom0less system Penny Zheng
2022-03-11  6:11 ` [PATCH v1 01/13] xen/arm: introduce static shared memory Penny Zheng
2022-03-18  1:59   ` Stefano Stabellini
2022-03-11  6:11 ` [PATCH v1 02/13] xen/arm: introduce a special domain DOMID_SHARED Penny Zheng
2022-03-18  1:59   ` Stefano Stabellini
2022-03-18  6:43     ` Penny Zheng
2022-03-18 22:02       ` Stefano Stabellini [this message]
2022-03-18  8:53   ` Jan Beulich
2022-03-18 21:50     ` Stefano Stabellini
2022-03-21  8:48       ` Jan Beulich
2022-03-21 20:03         ` Stefano Stabellini
2022-04-09  9:11           ` Julien Grall
2022-04-15  8:08             ` Penny Zheng
2022-04-15 22:18               ` Stefano Stabellini
2022-04-15 23:45                 ` Julien Grall
2022-03-18 22:20     ` Stefano Stabellini
2022-04-15  9:52     ` Penny Zheng
2022-04-15 23:34       ` Julien Grall
2022-04-19  8:10       ` Jan Beulich
2022-03-11  6:11 ` [PATCH v1 03/13] xen/arm: allocate static shared memory to dom_shared Penny Zheng
2022-03-18  1:59   ` Stefano Stabellini
2022-03-18  8:35     ` Penny Zheng
2022-03-18 22:27       ` Stefano Stabellini
2022-03-11  6:11 ` [PATCH v1 04/13] xen/arm: add P2M type parameter in guest_physmap_add_pages Penny Zheng
2022-03-11  6:11 ` [PATCH v1 05/13] xen/arm: introduce get_pages_from_gfn Penny Zheng
2022-03-11  6:11 ` [PATCH v1 06/13] xen/arm: set up shared memory foreign mapping for borrower domain Penny Zheng
2022-03-18  2:00   ` Stefano Stabellini
2022-03-29  3:44     ` Penny Zheng
2022-04-08 22:18       ` Stefano Stabellini
2022-04-08 22:50         ` Julien Grall
2022-04-08 23:18           ` Stefano Stabellini
2022-04-08 22:59   ` Julien Grall
2022-04-09  9:30     ` Julien Grall
2022-04-20  8:53       ` Penny Zheng
2022-04-20  8:51     ` Penny Zheng
2022-03-11  6:11 ` [PATCH v1 07/13] xen/arm: create shared memory nodes in guest device tree Penny Zheng
2022-03-18  2:00   ` Stefano Stabellini
2022-03-11  6:11 ` [PATCH v1 08/13] xen/arm: destroy static shared memory when de-construct domain Penny Zheng
2022-04-09  9:25   ` Julien Grall
2022-04-21  7:00     ` Penny Zheng
2022-03-11  6:11 ` [PATCH v1 09/13] xen/arm: enable statically shared memory on Dom0 Penny Zheng
2022-03-11  6:11 ` [PATCH v1 10/13] xen/arm: allocate static shared memory to a specific owner domain Penny Zheng
2022-03-18  2:00   ` Stefano Stabellini
2022-03-11  6:11 ` [PATCH v1 11/13] xen/arm: store shm-info for deferred foreign memory map Penny Zheng
2022-03-18  2:01   ` Stefano Stabellini
2022-03-29  8:37     ` Penny Zheng
2022-04-08 22:46       ` Stefano Stabellini
2022-04-09  9:14         ` Julien Grall
2022-03-11  6:11 ` [PATCH v1 12/13] xen/arm: defer foreign memory map in shm_init_late Penny Zheng
2022-03-11  6:11 ` [PATCH v1 13/13] xen/arm: unmap foreign memory mapping when destroyed domain is owner domain Penny Zheng
2022-04-09  9:44   ` Julien Grall

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