[PATCH v2] libxl: Avoid advertising about device_model_user config option

[Anthony PERARD <anthony.perard@citrix.com>]

Running QEMU as non-root user is not ready yet, so replace the warning
with a debug message and remove the option from the man page.

Also improve the doc to include more potential issue with running QEMU
as non-root.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
---
Changes in V2:
  - remove option from the man page
  - add a comment in the IDL.
---
 docs/man/xl.cfg.pod.5          | 7 -------
 docs/misc/qemu-deprivilege.txt | 5 +++--
 tools/libxl/libxl_dm.c         | 2 +-
 tools/libxl/libxl_types.idl    | 1 +
 4 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/docs/man/xl.cfg.pod.5 b/docs/man/xl.cfg.pod.5
index a4cc1b3..4a8bf51 100644
--- a/docs/man/xl.cfg.pod.5
+++ b/docs/man/xl.cfg.pod.5
@@ -1949,13 +1949,6 @@ Pass additional arbitrary options on the device-model command line for
 an HVM device model only. Each element in the list is passed as an
 option to the device-model.
 
-=item B<device_model_user="username">
-
-Run the device model as user "username", instead of
-xen-qemudepriv-domid$domid or xen-qemudepriv-shared or root.
-Please note that running QEMU as non-root causes migration and PCI
-passthrough not to work properly.
-
 =back
 
 =head2 Keymaps
diff --git a/docs/misc/qemu-deprivilege.txt b/docs/misc/qemu-deprivilege.txt
index 879a98e..58b86a3 100644
--- a/docs/misc/qemu-deprivilege.txt
+++ b/docs/misc/qemu-deprivilege.txt
@@ -31,5 +31,6 @@ adduser --no-create-home --system xen-qemuuser-shared
 As a last resort, libxl will start QEMU as root.
 
 
-Please note that running QEMU as non-root causes migration and PCI
-passthrough not to work properly.
+Please note that running QEMU as non-root causes several features like
+migration and PCI passthrough to not work properly and may prevent the guest
+from booting.
diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 65dceee..6bbc7c3 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1482,7 +1482,7 @@ static int libxl__build_device_model_args_new(libxl__gc *gc,
         }
 
         user = NULL;
-        LOG(WARN, "Could not find user %s, starting QEMU as root",
+        LOG(DEBUG, "Could not find user %s, starting QEMU as root",
             LIBXL_QEMU_USER_SHARED);
 
 end_search:
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index 9840f3b..ef614be 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -468,6 +468,7 @@ libxl_domain_build_info = Struct("domain_build_info",[
     ("device_model",     string),
     ("device_model_ssidref", uint32),
     ("device_model_ssid_label", string),
+    # device_model_user is not ready for use yet
     ("device_model_user", string),
 
     # extra parameters pass directly to qemu, NULL terminated
-- 
Anthony PERARD


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