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hw/vfio/display: add ramfb support

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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>
This commit is contained in:
Gerd Hoffmann 2018-10-15 10:52:09 -06:00 • committed by Alex Williamson
parent 7f623d0834
commit b290659fc3
4 changed files with 40 additions and 0 deletions
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12
hw/vfio/display.c
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@ -124,6 +124,9 @@ static void vfio_display_dmabuf_update(void *opaque)
primary = vfio_display_get_dmabuf(vdev, DRM_PLANE_TYPE_PRIMARY);
if (primary == NULL) {
if (dpy->ramfb) {
ramfb_display_update(dpy->con, dpy->ramfb);
}
return;
}
@ -181,6 +184,9 @@ static int vfio_display_dmabuf_init(VFIOPCIDevice *vdev, Error **errp)
vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
&vfio_display_dmabuf_ops,
vdev);
if (vdev->enable_ramfb) {
vdev->dpy->ramfb = ramfb_setup(errp);
}
return 0;
}
@ -228,6 +234,9 @@ static void vfio_display_region_update(void *opaque)
return;
}
if (!plane.drm_format || !plane.size) {
if (dpy->ramfb) {
ramfb_display_update(dpy->con, dpy->ramfb);
}
return;
}
format = qemu_drm_format_to_pixman(plane.drm_format);
@ -300,6 +309,9 @@ static int vfio_display_region_init(VFIOPCIDevice *vdev, Error **errp)
vdev->dpy->con = graphic_console_init(DEVICE(vdev), 0,
&vfio_display_region_ops,
vdev);
if (vdev->enable_ramfb) {
vdev->dpy->ramfb = ramfb_setup(errp);
}
return 0;
}