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, 1 insertions, 0 deletions

diff --git a/hw/vfio/pci.h b/hw/vfio/pci.h
index 52b065421a..b1ae4c0754 100644
--- a/hw/vfio/pci.h
+++ b/hw/vfio/pci.h
@@ -165,6 +165,7 @@ typedef struct VFIOPCIDevice {
     bool no_geforce_quirks;
     bool no_kvm_ioeventfd;
     bool no_vfio_ioeventfd;
+    bool enable_ramfb;
     VFIODisplay *dpy;
 } VFIOPCIDevice;