[PATCH] add feature flag to xenstore for XS_RESET_WATCHES

[Olaf Hering <olaf@aepfle.de>]

# HG changeset patch
# User Olaf Hering <olaf@aepfle.de>
# Date 1325788840 -3600
# Node ID 2f5a98692acde9e74d4009f50f83a8aa08296310
# Parent  3a22ed3ec534799b3cab55b0dc0a7380e701ecbe
add feature flag to xenstore for XS_RESET_WATCHES

Tell guest about availibilty of xenstoreds XS_RESET_WATCHES function.
Guests can not issue this command unconditionally because some buggy
toolstacks (such as EC2) do not ignore unknown commands properly.

Signed-off-by: Olaf Hering <olaf@aepfle.de>

diff -r 3a22ed3ec534 -r 2f5a98692acd tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -434,6 +434,7 @@ retry_transaction:
     libxl__xs_writev(gc, t, libxl__sprintf(gc, "%s/platform", dom_path), info->platformdata);
 
     xs_write(ctx->xsh, t, libxl__sprintf(gc, "%s/control/platform-feature-multiprocessor-suspend", dom_path), "1", 1);
+    xs_write(ctx->xsh, t, libxl__sprintf(gc, "%s/control/platform-feature-xs_reset_watches", dom_path), "1", 1);
     if (!xs_transaction_end(ctx->xsh, t, 0)) {
         if (errno == EAGAIN) {
             t = 0;
diff -r 3a22ed3ec534 -r 2f5a98692acd tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py
+++ b/tools/python/xen/xend/XendDomainInfo.py
@@ -1770,6 +1770,7 @@ class XendDomainInfo:
         f('store/port',       self.store_port)
         f('store/ring-ref',   self.store_mfn)
 
+        f('control/platform-feature-xs_reset_watches', True)
         if arch.type == "x86":
             f('control/platform-feature-multiprocessor-suspend', True)