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+id = 1891
+title = "qemu 8.1.0 breaks gvt-g + qemu-ui-gtk w gl=on (black screen, qemu: eglCreateImageKHR failed)"
+state = "closed"
+created_at = "2023-09-15T10:25:40.593Z"
+closed_at = "2023-10-10T01:28:04.205Z"
+labels = ["GUI::GTK", "Stable::to backport", "VFIO", "host: x86", "workflow::Patch available"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1891"
+host-os = "Manjaro latest, Artix latest"
+host-arch = "x86_64"
+qemu-version = "QEMU emulator version 8.1.0"
+guest-os = "Windows 10 21H1"
+guest-arch = "x86_64"
+description = """As of 8.1.0, qemu-ui-gtk renders a black window with the error `qemu: eglCreateImageKHR failed` repeatedly appearing in the command line.
+
+
+#"""
+reproduce = """1. enable kernel modules, set parameters etc.
+2. create vgpu
+     `echo "$GVT_GUID" > "/sys/devices/pci0000:00/0000:00:02.0/mdev_supported_types/i915-GVTg_V4_2/create"`
+3. launch VM
+4. wait
+
+Instructions (a small part of which I wrote by trial and error) for the setup are on the [Arch Wiki](https://wiki.archlinux.org/title/Intel_GVT-g).
+
+#"""
+additional = """Windows is installed directly to a second SSD, I dual-boot it.  
+I've been using this exact VM, from libvirt, for almost two years.  
+relevant sections:
+```
+    <hostdev mode="subsystem" type="mdev" managed="no" model="vfio-pci" display="off">
+      <source>
+        <address uuid="$GVT_GUID"/>
+      </source>
+    </hostdev>
+  </devices>
+  <qemu:commandline>
+    <qemu:arg value="-display"/>
+    <qemu:arg value="gtk,gl=on,zoom-to-fit=off"/>
+    <qemu:env name="DISPLAY" value=":0.0"/>
+  </qemu:commandline>
+  <qemu:override>
+    <qemu:device alias="hostdev0">
+      <qemu:frontend>
+        <qemu:property name="x-igd-opregion" type="bool" value="true"/>
+        <qemu:property name="driver" type="string" value="vfio-pci-nohotplug"/>
+        <qemu:property name="ramfb" type="bool" value="true"/>
+        <qemu:property name="display" type="string" value="on"/>
+        <qemu:property name="romfile" type="string" value="/home/user/VM/vbios_gvt_uefi.rom"/>
+      </qemu:frontend>
+    </qemu:device>
+  </qemu:override>
+```
+
+The patched vBIOS necessary to use DMA-BUF with OVMF is linked there too, but its [successors](https://github.com/patmagauran/i915ovmfPkg) doesn't work either.
+
+#"""