[PULL 05/24] vhost-user-gpu: check backend for EDID support

[Gerd Hoffmann]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

EDID has been enabled by default, but the backend may not implement
it (such as the contrib backend). This results in extra warnings and
potentially other issues in the guest.

The option shouldn't probably have been added to VIRTIO_GPU_BASE, but
it's a bit too late now, report an error and disable EDID when it's
not available.

Fixes: 0a7196625 ("edid: flip the default to enabled")

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20210204105232.834642-2-marcandre.lureau@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/display/vhost-user-gpu.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hw/display/vhost-user-gpu.c b/hw/display/vhost-user-gpu.c
index 51f1747c4a41..55b0ed15f250 100644
--- a/hw/display/vhost-user-gpu.c
+++ b/hw/display/vhost-user-gpu.c
@@ -555,6 +555,12 @@ vhost_user_gpu_device_realize(DeviceState *qdev, Error 
**errp)
     if (virtio_has_feature(g->vhost->dev.features, VIRTIO_GPU_F_VIRGL)) {
         g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_VIRGL_ENABLED;
     }
+    if (virtio_has_feature(g->vhost->dev.features, VIRTIO_GPU_F_EDID)) {
+        g->parent_obj.conf.flags |= 1 << VIRTIO_GPU_FLAG_EDID_ENABLED;
+    } else {
+        error_report("EDID requested but the backend doesn't support it.");
+        g->parent_obj.conf.flags &= ~(1 << VIRTIO_GPU_FLAG_EDID_ENABLED);
+    }
 
     if (!virtio_gpu_base_device_realize(qdev, NULL, NULL, errp)) {
         return;
-- 
2.29.2