[PATCH] Report reboot required via xenstore

[Owen Smith <owen.smith@xxxxxxxxxx>]

Report if the driver requires a reboot to xenstore, so that the
toolstack can detect if a driver requires a reboot. This is useful if
drivers are delivered by Windows Update, or another hands-free method,
that does not correctly manage reboots and the popup provided by
xenbus_monitor is not sufficient to guarantee the reboot is visible
(i.e. the VM is being run as a headless server without a visible user
session)

Signed-off-by: Owen Smith <owen.smith@xxxxxxxxxx>
---
 src/xenvbd/adapter.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/xenvbd/adapter.c b/src/xenvbd/adapter.c
index 5e20944..de78ac0 100644
--- a/src/xenvbd/adapter.c
+++ b/src/xenvbd/adapter.c
@@ -501,8 +501,15 @@ __AdapterEnumerate(
 
     if (NeedInvalidate)
         AdapterTargetListChanged(Adapter);
-    if (NeedReboot)
+    if (NeedReboot) {
+        (VOID) XENBUS_STORE(Printf,
+                            &Adapter->StoreInterface,
+                            NULL,
+                            "feature/reboot-required",
+                            "xenvbd",
+                            "1");
         DriverRequestReboot();
+    }
 }
 
 static DECLSPEC_NOINLINE NTSTATUS
-- 
2.16.2.windows.1