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 <phi...@redhat.com>
---
Based-on: <20190412152713.16018-1-marcandre.lur...@redhat.com>
---
 vl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/vl.c b/vl.c
index 840c45c00fa..dfeda8bd7fc 100644
--- a/vl.c
+++ b/vl.c
@@ -2029,6 +2029,7 @@ 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",
@@ -2067,6 +2068,7 @@ static const VGAInterfaceInfo 
vga_interfaces[VGA_TYPE_MAX] = {
     },
     [VGA_XENFB] = {
         .opt_name = "xenfb",
+        .name = "Xen paravirtualized framebuffer",
     },
 };
 
-- 
2.20.1


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