linux-kernel - [PATCH] xen: Make XEN_BACKEND selectable by DomU

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Message-Id: <20180920143237.10000-1-jandryuk@gmail.com>
Date:   Thu, 20 Sep 2018 10:32:36 -0400
From:   Jason Andryuk <jandryuk@...il.com>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>
Cc:     Jason Andryuk <jandryuk@...il.com>, xen-devel@...ts.xenproject.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] xen: Make XEN_BACKEND selectable by DomU

XEN_BACKEND doesn't actually depend on XEN_DOM0.  DomUs can serve
backends to other DomUs.  One example is a service VM providing network
backends.

The original Kconfig defaulted Dom0 to y and it could be disabled.  DomU
could not select the option.  With the new Kconfig, we default y for
Dom0 and n for DomU.  Either can then toggle the selection.

Signed-off-by: Jason Andryuk <jandryuk@...il.com>
---
OpenXT runs network backends in a network service DomU that shares out
PCI NICs.

 drivers/xen/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index b459edfacff3..af1bf99318c6 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -101,8 +101,7 @@ config XEN_DEV_EVTCHN
 
 config XEN_BACKEND
 	bool "Backend driver support"
-	depends on XEN_DOM0
-	default y
+	default y if XEN_DOM0
 	help
 	  Support for backend device drivers that provide I/O services
 	  to other virtual machines.
-- 
2.17.1