[v7,03/19] libxl: fix qemu-trad cmdline for no sdl/vnc case
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Message ID 20200519015503.115236-4-jandryuk@gmail.com
State New
Headers show
  • Add support for qemu-xen runnning in a Linux-based stubdomain
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Commit Message

Jason Andryuk May 19, 2020, 1:54 a.m. UTC
From: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

When qemu is running in stubdomain, any attempt to initialize vnc/sdl
there will crash it (on failed attempt to load a keymap from a file). If
vfb is present, all those cases are skipped. But since
b053f0c4c9e533f3d97837cf897eb920b8355ed3 "libxl: do not start dom0 qemu
for stubdomain when not needed" it is possible to create a stubdomain
without vfb and contrary to the comment -vnc none do trigger VNC
initialization code (just skips exposing it externally).
Change the implicit SDL avoiding method to -nographics option, used when
none of SDL or VNC is enabled.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Reviewed-by: Jason Andryuk <jandryuk@gmail.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Changes in v2:
 - typo in qemu option
Changes in v3:
 - add missing { }
 tools/libxl/libxl_dm.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

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diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index f4007bbe50..b91e63db6f 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -734,14 +734,15 @@  static int libxl__build_device_model_args_old(libxl__gc *gc,
         if (libxl_defbool_val(vnc->findunused)) {
             flexarray_append(dm_args, "-vncunused");
-    } else
+    } else if (!sdl) {
          * VNC is not enabled by default by qemu-xen-traditional,
-         * however passing -vnc none causes SDL to not be
-         * (unexpectedly) enabled by default. This is overridden by
-         * explicitly passing -sdl below as required.
+         * however skipping -vnc causes SDL to be
+         * (unexpectedly) enabled by default. If undesired, disable graphics at
+         * all.
-        flexarray_append_pair(dm_args, "-vnc", "none");
+        flexarray_append(dm_args, "-nographic");
+    }
     if (sdl) {
         flexarray_append(dm_args, "-sdl");