[PATCH 3/3] libxl: don't try to manipulate json config for stubdomain

["Marek Marczykowski-Górecki" <marmarek@invisiblethingslab.com>]

Stubdomain do not have it's own config file - its configuration is
derived from target domains. Do not try to manipulate it when attaching
PCI device.

This bug prevented starting HVM with stubdomain and PCI passthrough
device attached.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 tools/libxl/libxl_pci.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/tools/libxl/libxl_pci.c b/tools/libxl/libxl_pci.c
index 3805d30..5ad70c5 100644
--- a/tools/libxl/libxl_pci.c
+++ b/tools/libxl/libxl_pci.c
@@ -151,14 +151,18 @@ static int libxl__device_pci_add_xenstore(libxl__gc *gc, uint32_t domid, libxl_d
     GCNEW(device);
     libxl__device_from_pcidev(gc, domid, pcidev, device);
 
-    lock = libxl__lock_domain_userdata(gc, domid);
-    if (!lock) {
-        rc = ERROR_LOCK_FAIL;
-        goto out;
-    }
+    /* Stubdomain config is derived from its target domain, it doesn't have
+       its own file */
+    if (!libxl_is_stubdom(CTX, domid, NULL)) {
+        lock = libxl__lock_domain_userdata(gc, domid);
+        if (!lock) {
+            rc = ERROR_LOCK_FAIL;
+            goto out;
+        }
 
-    rc = libxl__get_domain_configuration(gc, domid, &d_config);
-    if (rc) goto out;
+        rc = libxl__get_domain_configuration(gc, domid, &d_config);
+        if (rc) goto out;
+    }
 
     DEVICE_ADD(pci, pcidevs, domid, &pcidev_saved, COMPARE_PCI, &d_config);
 
@@ -169,8 +173,10 @@ static int libxl__device_pci_add_xenstore(libxl__gc *gc, uint32_t domid, libxl_d
         rc = libxl__xs_transaction_start(gc, &t);
         if (rc) goto out;
 
-        rc = libxl__set_domain_configuration(gc, domid, &d_config);
-        if (rc) goto out;
+        if (lock) {
+            rc = libxl__set_domain_configuration(gc, domid, &d_config);
+            if (rc) goto out;
+        }
 
         libxl__xs_writev(gc, t, be_path, libxl__xs_kvs_of_flexarray(gc, back));
 
-- 
2.5.5


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