vl: Replace DT_NOGRAPHIC with machine option

All DisplayType values are just UI options that don't affect any
hardware emulation code, except for DT_NOGRAPHIC. Replace
DT_NOGRAPHIC with DT_NONE plus a new "-machine graphics=on|off"
option, so hardware emulation code don't need to use the
display_type variable.

Cc: Michael Walle <michael@walle.cc>
Cc: Blue Swirl <blauwirbel@gmail.com>
Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/hw/boards.h b/include/hw/boards.h
index 8d4fe56b5f..f968a256dc 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -154,6 +154,7 @@ struct MachineState {
     bool iommu;
     bool suppress_vmdesc;
     bool enforce_config_section;
+    bool enable_graphics;
 
     ram_addr_t ram_size;
     ram_addr_t maxram_size;