[Xen-changelog] [xen master] libxl: don't remove device frontend path from driver domains

[patchbot@xxxxxxx]

commit 51e20c55808cfe3e51b45f6ff2a45775170fa5e4
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Sep 18 13:15:14 2013 +0200
Commit:     Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Mon Nov 18 17:08:49 2013 +0000

    libxl: don't remove device frontend path from driver domains
    
    A domain different than LIBXL_TOOLSTACK_DOMID should not try to remove
    the frontend paths of a device.
    
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_device.c |   20 ++++++++++++++++++--
 1 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_device.c b/tools/libxl/libxl_device.c
index cce9e32..d5f23cf 100644
--- a/tools/libxl/libxl_device.c
+++ b/tools/libxl/libxl_device.c
@@ -551,6 +551,10 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device 
*dev)
     const char *tapdisk_params;
     xs_transaction_t t = 0;
     int rc;
+    uint32_t domid;
+
+    rc = libxl__get_domid(gc, &domid);
+    if (rc) goto out;
 
     for (;;) {
         rc = libxl__xs_transaction_start(gc, &t);
@@ -560,8 +564,20 @@ int libxl__device_destroy(libxl__gc *gc, libxl__device 
*dev)
         rc = libxl__xs_read_checked(gc, t, tapdisk_path, &tapdisk_params);
         if (rc) goto out;
 
-        libxl__xs_path_cleanup(gc, t, fe_path);
-        libxl__xs_path_cleanup(gc, t, be_path);
+        if (domid == LIBXL_TOOLSTACK_DOMID) {
+            /*
+             * The toolstack domain is in charge for removing both the
+             * frontend and the backend path
+             */
+            libxl__xs_path_cleanup(gc, t, fe_path);
+            libxl__xs_path_cleanup(gc, t, be_path);
+        } else if (dev->backend_domid == domid) {
+            /*
+             * The driver domain is in charge for removing what it can
+             * from the backend path
+             */
+            libxl__xs_path_cleanup(gc, t, be_path);
+        }
 
         rc = libxl__xs_transaction_commit(gc, &t);
         if (!rc) break;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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