If a domain is configured to have an egl-headless display and a virtio video device, virgl will be enabled automatically within the guest, even if the video device is configured with accel3d='no'. In this case we should explicitly pass 'virgl=off' to qemu. See https://bugzilla.redhat.com/show_bug.cgi?id=1791236 for more information. Signed-off-by: Jonathon Jongsma <jjongsma(a)redhat.com&gt; --- src/qemu/qemu_command.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 46680fd829..3378413ee1 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -4429,7 +4429,10 @@ qemuBuildDeviceVideoStr(const virDomainDef *def, if (video->backend != VIR_DOMAIN_VIDEO_BACKEND_TYPE_VHOSTUSER && video->type == VIR_DOMAIN_VIDEO_TYPE_VIRTIO) { - if (video->accel && video->accel->accel3d == VIR_TRISTATE_SWITCH_ON) { + if (video->accel && + virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_GPU_VIRGL) && + (video->accel->accel3d == VIR_TRISTATE_SWITCH_ON || + video->accel->accel3d == VIR_TRISTATE_SWITCH_OFF)) { virBufferAsprintf(&buf, ",virgl=%s", virTristateSwitchTypeToString(video->accel->accel3d)); } -- 2.21.0