From: Roger Pau Monne <roger.pau@citrix.com>
Date: Wed, 2 Oct 2013 09:24:23 +0000 (+0200)
Subject: libxl/hotplug: add support for getting domid
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~6068
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=d6bc83a531e4cfdd29da95afa992b95be8316080;p=xen.git

libxl/hotplug: add support for getting domid

This patch writes Dom0 domid on xenstore (like it's done for other
guests), and adds a libxl helper function to fetch that domid from
xenstore.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
[ ijc -- dropped xencommons hunk, same change was made independently
  in 02ebea7768fe ]
---

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index bede011157..0f0f56c248 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1692,6 +1692,23 @@ int libxl_vncviewer_exec(libxl_ctx *ctx, uint32_t domid, int autopass)
     return ERROR_FAIL;
 }
 
+int libxl__get_domid(libxl__gc *gc, uint32_t *domid)
+{
+    int rc;
+    const char *xs_domid;
+
+    rc = libxl__xs_read_checked(gc, XBT_NULL, DOMID_XS_PATH, &xs_domid);
+    if (rc || !xs_domid) {
+        rc = rc ? rc : ERROR_FAIL;
+        goto out;
+    }
+
+    *domid = atoi(xs_domid);
+
+out:
+    return rc;
+}
+
 /******************************************************************************/
 
 /* generic callback for devices that only need to set ao_complete */
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 4f925220bb..4729566387 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -101,6 +101,7 @@
 #define STUBDOM_SPECIAL_CONSOLES 3
 #define TAP_DEVICE_SUFFIX "-emu"
 #define DISABLE_UDEV_PATH "libxl/disable_udev"
+#define DOMID_XS_PATH "domid"
 
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
 
@@ -978,6 +979,8 @@ _hidden const char *libxl__device_nic_devname(libxl__gc *gc,
                                               uint32_t devid,
                                               libxl_nic_type type);
 
+_hidden int libxl__get_domid(libxl__gc *gc, uint32_t *domid);
+
 /*
  * libxl__ev_devstate - waits a given time for a device to
  * reach a given state.  Follows the libxl_ev_* conventions.