xen: add backend driver support

Impact: backend device support

Add the basic machinery to support backend drivers.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
[corresponds to 79727b851bac in git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 10b6bef2e217..84bf17bbb1cd 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -29,6 +29,14 @@ config XEN_DEV_EVTCHN
           firing.
           If in doubt, say yes.
 
+config XEN_BACKEND
+        tristate "Backend driver support"
+        depends on XEN_DOM0
+        default y
+        help
+          Support for backend device drivers that provide I/O services
+          to other virtual machines.
+
 config XENFS
         tristate "Xen filesystem"
         default y