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From: Anthony PERARD <anthony.perard@citrix.com>
To: Paul Durrant <paul.durrant@citrix.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	qemu-block@nongnu.org, qemu-devel@nongnu.org,
	Max Reitz <mreitz@redhat.com>,
	xen-devel@lists.xenproject.org
Subject: Re: [PATCH v3 05/18] xen: add xenstore watcher infrastructure
Date: Tue, 11 Dec 2018 15:21:29 +0000	[thread overview]
Message-ID: <20181211152129.GS18875@perard.uk.xensource.com> (raw)
In-Reply-To: <1544525238-3527-6-git-send-email-paul.durrant@citrix.com>

On Tue, Dec 11, 2018 at 10:47:05AM +0000, Paul Durrant wrote:
> A Xen PV frontend communicates its state to the PV backend by writing to
> the 'state' key in the frontend area in xenstore. It is therefore
> necessary for a XenDevice implementation to be notified whenever the
> value of this key changes.
> 
> This patch adds code to do this as follows:
> 
> - an 'fd handler' is registered on the libxenstore handle which will be
>   triggered whenever a 'watch' event occurs
> - primitives are added to xen-bus-helper to add or remove watch events
> - a list of Notifier objects is added to XenBus to provide a mechanism
>   to call the appropriate 'watch handler' when its associated event
>   occurs
> 
> The xen-block implementation is extended with a 'frontend_changed' method,
> which calls as-yet stub 'connect' and 'disconnect' functions when the
> relevant frontend state transitions occur. A subsequent patch will supply
> a full implementation for these functions.
> 
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>

Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

-- 
Anthony PERARD

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel

WARNING: multiple messages have this Message-ID (diff)
From: Anthony PERARD <anthony.perard@citrix.com>
To: Paul Durrant <paul.durrant@citrix.com>
Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org,
	xen-devel@lists.xenproject.org, Kevin Wolf <kwolf@redhat.com>,
	Max Reitz <mreitz@redhat.com>,
	Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [Qemu-devel] [PATCH v3 05/18] xen: add xenstore watcher infrastructure
Date: Tue, 11 Dec 2018 15:21:29 +0000	[thread overview]
Message-ID: <20181211152129.GS18875@perard.uk.xensource.com> (raw)
In-Reply-To: <1544525238-3527-6-git-send-email-paul.durrant@citrix.com>

On Tue, Dec 11, 2018 at 10:47:05AM +0000, Paul Durrant wrote:
> A Xen PV frontend communicates its state to the PV backend by writing to
> the 'state' key in the frontend area in xenstore. It is therefore
> necessary for a XenDevice implementation to be notified whenever the
> value of this key changes.
> 
> This patch adds code to do this as follows:
> 
> - an 'fd handler' is registered on the libxenstore handle which will be
>   triggered whenever a 'watch' event occurs
> - primitives are added to xen-bus-helper to add or remove watch events
> - a list of Notifier objects is added to XenBus to provide a mechanism
>   to call the appropriate 'watch handler' when its associated event
>   occurs
> 
> The xen-block implementation is extended with a 'frontend_changed' method,
> which calls as-yet stub 'connect' and 'disconnect' functions when the
> relevant frontend state transitions occur. A subsequent patch will supply
> a full implementation for these functions.
> 
> Signed-off-by: Paul Durrant <paul.durrant@citrix.com>

Reviewed-by: Anthony PERARD <anthony.perard@citrix.com>

-- 
Anthony PERARD

  reply	other threads:[~2018-12-11 15:22 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-11 10:47 [PATCH v3 00/18] Xen PV backend 'qdevification' Paul Durrant
2018-12-11 10:47 ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 01/18] xen: re-name XenDevice to XenLegacyDevice Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 02/18] xen: introduce new 'XenBus' and 'XenDevice' object hierarchy Paul Durrant
2018-12-11 10:47 ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 03/18] xen: introduce 'xen-block', 'xen-disk' and 'xen-cdrom' Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 15:16   ` Anthony PERARD
2018-12-11 15:16     ` [Qemu-devel] " Anthony PERARD
2018-12-11 15:40     ` Paul Durrant
2018-12-11 15:40       ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 04/18] xen: create xenstore areas for XenDevice-s Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 15:19   ` Anthony PERARD
2018-12-11 15:19     ` [Qemu-devel] " Anthony PERARD
2018-12-11 10:47 ` [PATCH v3 05/18] xen: add xenstore watcher infrastructure Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 15:21   ` Anthony PERARD [this message]
2018-12-11 15:21     ` Anthony PERARD
2018-12-11 10:47 ` [PATCH v3 06/18] xen: add grant table interface for XenDevice-s Paul Durrant
2018-12-11 10:47 ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [Qemu-devel] [PATCH v3 07/18] xen: add event channel " Paul Durrant
2018-12-11 15:24   ` Anthony PERARD
2018-12-11 15:24     ` [Qemu-devel] " Anthony PERARD
2018-12-11 15:43     ` Paul Durrant
2018-12-11 15:43       ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` Paul Durrant
2018-12-11 10:47 ` [PATCH v3 08/18] xen: duplicate xen_disk.c as basis of dataplane/xen-block.c Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 09/18] xen: remove unnecessary code from dataplane/xen-block.c Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 15:30   ` Anthony PERARD
2018-12-11 15:30     ` [Qemu-devel] [Xen-devel] " Anthony PERARD
2018-12-11 15:38     ` Paul Durrant
2018-12-11 15:38       ` [Qemu-devel] [Xen-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 10/18] xen: add header and build dataplane/xen-block.c Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 11/18] xen: remove 'XenBlkDev' and 'blkdev' names from dataplane/xen-block Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 12/18] xen: remove 'ioreq' struct/varable/field names from dataplane/xen-block.c Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 13/18] xen: purge 'blk' and 'ioreq' from function names in dataplane/xen-block.c Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 14/18] xen: add implementations of xen-block connect and disconnect functions Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 16:17   ` Anthony PERARD
2018-12-11 16:17     ` [Qemu-devel] " Anthony PERARD
2018-12-11 10:47 ` [PATCH v3 15/18] xen: add a mechanism to automatically create XenDevice-s Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 16/18] xen: automatically create XenBlockDevice-s Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 17/18] MAINTAINERS: add myself as a Xen maintainer Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant
2018-12-11 10:47 ` [PATCH v3 18/18] xen: remove the legacy 'xen_disk' backend Paul Durrant
2018-12-11 10:47   ` [Qemu-devel] " Paul Durrant

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