hw/vfio/display: add ramfb support

So we have a boot display when using a vgpu as primary display.

ramfb depends on a fw_cfg file.  fw_cfg files can not be added and
removed at runtime, therefore a ramfb-enabled vfio device can't be
hotplugged.

Add a nohotplug variant of the vfio-pci device (as child class).  Add
the ramfb property to the nohotplug variant only.  So to enable the vgpu
display with boot support use this:

  -device vfio-pci-nohotplug,display=on,ramfb=on,sysfsdev=...

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 6be9a93..e46a289 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -26,6 +26,7 @@
 #include "qemu/queue.h"
 #include "qemu/notify.h"
 #include "ui/console.h"
+#include "hw/display/ramfb.h"
 #ifdef CONFIG_LINUX
 #include <linux/vfio.h>
 #endif
@@ -147,6 +148,7 @@ typedef struct VFIODMABuf {
 
 typedef struct VFIODisplay {
     QemuConsole *con;
+    RAMFBState *ramfb;
     struct {
         VFIORegion buffer;
         DisplaySurface *surface;