[xen staging] libxl: consider also qemu in stubdomain in libxl__dm_active check

[patchbot@xxxxxxx]

commit cfc47cd4e24f3bfbe9b69f3196d1dd31f7423c31
Author:     Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
AuthorDate: Mon May 18 21:55:01 2020 -0400
Commit:     Wei Liu <wl@xxxxxxx>
CommitDate: Tue May 19 16:19:15 2020 +0100

    libxl: consider also qemu in stubdomain in libxl__dm_active check
    
    Since qemu-xen can now run in stubdomain too, handle this case when
    checking it's state too.
    
    Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
    Reviewed-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
    Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
 tools/libxl/libxl_dm.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 86694f669d..454a2815ed 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -3734,12 +3734,18 @@ out:
 
 int libxl__dm_active(libxl__gc *gc, uint32_t domid)
 {
-    char *pid, *path;
+    char *pid, *dm_domid, *path;
 
     path = GCSPRINTF("/local/domain/%d/image/device-model-pid", domid);
     pid = libxl__xs_read(gc, XBT_NULL, path);
 
-    return pid != NULL;
+    if (pid)
+        return true;
+
+    path = GCSPRINTF("/local/domain/%d/image/device-model-domid", domid);
+    dm_domid = libxl__xs_read(gc, XBT_NULL, path);
+
+    return dm_domid != NULL;
 }
 
 int libxl__dm_check_start(libxl__gc *gc, libxl_domain_config *d_config,
--
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