vl: Add missing descriptions to the VGA adapters list

Some VGA adapters do not contain an helpful description,
this can be confusing:

  $ qemu-system-arm -M virt -vga help
  none
  std                  standard VGA
  cirrus               Cirrus VGA (default)
  vmware               VMWare SVGA
  xenfb

Add a description to the missing adapters:

  $ qemu-system-arm -M virt -vga help
  none                 no graphic card
  std                  standard VGA
  cirrus               Cirrus VGA (default)
  vmware               VMWare SVGA
  xenfb                Xen paravirtualized framebuffer

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Based-on: <20190412152713.16018-1-marcandre.lureau@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Message-Id: <20190412163706.3878-1-philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index 2e44f7d..f49b119 100644
--- a/vl.c
+++ b/vl.c
@@ -2018,6 +2018,7 @@ typedef struct VGAInterfaceInfo {
 static const VGAInterfaceInfo vga_interfaces[VGA_TYPE_MAX] = {
     [VGA_NONE] = {
         .opt_name = "none",
+        .name = "no graphic card",
     },
     [VGA_STD] = {
         .opt_name = "std",
@@ -2056,6 +2057,7 @@ static const VGAInterfaceInfo vga_interfaces[VGA_TYPE_MAX] = {
     },
     [VGA_XENFB] = {
         .opt_name = "xenfb",
+        .name = "Xen paravirtualized framebuffer",
     },
 };