linux-kernel - [PATCH 6/6] drivers: enable xenwatch multithreading for xen-netback and xen-blkback driver

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Date:   Fri, 14 Sep 2018 15:34:16 +0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     boris.ostrovsky@...cle.com, jgross@...e.com,
        paul.durrant@...rix.com, wei.liu2@...rix.com,
        konrad.wilk@...cle.com, roger.pau@...rix.com,
        srinivas.eeda@...cle.com
Subject: [PATCH 6/6] drivers: enable xenwatch multithreading for xen-netback and xen-blkback driver

This is the 6th patch of a (6-patch) patch set.

As the 'use_mtwatch' for xen-netback and xen-blkback are set to true,
probing any xenbus devices of those two drivers would create the per-domU
xenwatch thread for the domid the new devices belong to, or increment the
reference count  of existing thread.

Xenwatch multithreading might be enabled for more xen backend pv drivers in
the future.

Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 drivers/block/xen-blkback/xenbus.c | 3 ++-
 drivers/net/xen-netback/xenbus.c   | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index a4bc74e..debbbd0 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -1108,7 +1108,8 @@ static struct xenbus_driver xen_blkbk_driver = {
 	.ids  = xen_blkbk_ids,
 	.probe = xen_blkbk_probe,
 	.remove = xen_blkbk_remove,
-	.otherend_changed = frontend_changed
+	.otherend_changed = frontend_changed,
+	.use_mtwatch = true,
 };
 
 int xen_blkif_xenbus_init(void)
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c
index cd51492..63d46a7 100644
--- a/drivers/net/xen-netback/xenbus.c
+++ b/drivers/net/xen-netback/xenbus.c
@@ -1203,6 +1203,7 @@ static struct xenbus_driver netback_driver = {
 	.remove = netback_remove,
 	.uevent = netback_uevent,
 	.otherend_changed = frontend_changed,
+	.use_mtwatch = true,
 };
 
 int xenvif_xenbus_init(void)
-- 
2.7.4