[Xen-devel] [PATCH RFC 01/12] libxl/hotplug: add support for getting domid

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

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 Monnà <roger.pau@xxxxxxxxxx>
Cc: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 tools/hotplug/Linux/init.d/xencommons |    1 +
 tools/libxl/libxl.c                   |   17 +++++++++++++++++
 tools/libxl/libxl_internal.h          |    3 +++
 3 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/tools/hotplug/Linux/init.d/xencommons 
b/tools/hotplug/Linux/init.d/xencommons
index a2e633b..43e09bc 100644
--- a/tools/hotplug/Linux/init.d/xencommons
+++ b/tools/hotplug/Linux/init.d/xencommons
@@ -110,6 +110,7 @@ do_start () {
 
                echo Setting domain 0 name...
                ${BINDIR}/xenstore-write "/local/domain/0/name" "Domain-0"
+               ${BINDIR}/xenstore-write "/local/domain/0/domid" "0"
        fi
 
        echo Starting xenconsoled...
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 1bce4bb..5417b48 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -1688,6 +1688,23 @@ 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 f051d91..3b74726 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.
-- 
1.7.7.5 (Apple Git-26)


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