id = 776
title = "Windows guest fails to start on 6.1.0 - opengl is not available"
state = "opened"
created_at = "2021-12-14T20:43:33.295Z"
closed_at = "n/a"
labels = ["GUI"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/776"
host-os = "Arch Linux"
host-arch = "x86"
qemu-version = "6.1.0,"
guest-os = "Windows 10"
guest-arch = "x86"
description = """I've created a Windows 10 guest with virt-manager. The VM started successfully with qemu 6.0.0-3. After upgrading to 6.1.0
it fails with the following error:

```
2021-12-14T19:11:52.884272Z qemu-system-x86_64: warning: This feature depends on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk [bit 28]
2021-12-14T19:11:52.885199Z qemu-system-x86_64: warning: This feature depends on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk [bit 28]
2021-12-14T19:11:52.885852Z qemu-system-x86_64: warning: This feature depends on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk [bit 28]
2021-12-14T19:11:52.886485Z qemu-system-x86_64: warning: This feature depends on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk [bit 28]
2021-12-14T19:11:52.887098Z qemu-system-x86_64: warning: This feature depends on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk [bit 28]
2021-12-14T19:11:52.887773Z qemu-system-x86_64: warning: This feature depends on other features that were not requested: CPUID.8000000AH:EDX.svme-addr-chk [bit 28]
2021-12-14T19:11:52.912523Z qemu-system-x86_64: -device virtio-vga-gl,id=video0,max_outputs=1,bus=pcie.0,addr=0x1: opengl is not available
2021-12-14 19:11:53.109+0000: shutting down, reason=failed
```

Upgrading to 6.2.0.rc4 did not fix it. Downgrading to 6.0.0-3 made it work again. This makes it clear to me that the bug was introduce in qemu > 6.0.0 and seems to be not fix by now.

I was able to start the guest on 6.1.0 by disabling 3D acceleration."""
reproduce = """1. Create Windows 10 guest VM
2. Start with qemu 6.0.0 -> Works
3. Start with qemu 6.1.0 -> Broken"""
additional = """People on Reddit mention the same characteristic of this bug -> https://www.reddit.com/r/Fedora/comments/qqw3sq/qemu_video_virtio_opengl_not_available_after/"""