tools/libxl: Improve videoram setting

- If videoram setting is less than 8 mb shows error and exit.
- Added videoram setting for qemu upstream with cirrus (added in qemu 1.3).
- Updated xl.cfg man.
- Default and minimal videoram changed to 16 mb if stdvga is set and upstream
  qemu is being used. This is required by qemu 1.4 to avoid a xen memory error
  (qemu 1.3 doesn't complain about it, probably buggy).

Signed-off-by: Fabio Fantoni <fabio.fantoni@heliman.it>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 51f9914266..465b1fd950 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -430,6 +430,12 @@ static char ** libxl__build_device_model_args_new(libxl__gc *gc,
             break;
         case LIBXL_VGA_INTERFACE_TYPE_CIRRUS:
             flexarray_vappend(dm_args, "-vga", "cirrus", NULL);
+            if (b_info->video_memkb) {
+                flexarray_vappend(dm_args, "-global",
+                libxl__sprintf(gc, "vga.vram_size_mb=%d",
+                libxl__sizekb_to_mb(b_info->video_memkb)),
+                NULL);
+            }
             break;
         }