The QEMU project is currently moving its bug tracking to another system. For this we need to know which bugs are still valid and which could be closed already. Thus we are setting the bug state to "Incomplete" now.
If the bug has already been fixed in the latest upstream version of QEMU, then please close this ticket as "Fix released". If it is not fixed yet and you think that this bug report here is still valid, then you have two options: 1) If you already have an account on gitlab.com, please open a new ticket for this problem in our new tracker here: https://gitlab.com/qemu-project/qemu/-/issues and then close this ticket here on Launchpad (or let it expire auto- matically after 60 days). Please mention the URL of this bug ticket on Launchpad in the new ticket on GitLab. 2) If you don't have an account on gitlab.com and don't intend to get one, but still would like to keep this ticket opened, then please switch the state back to "New" or "Confirmed" within the next 60 days (other- wise it will get closed as "Expired"). We will then eventually migrate the ticket automatically to the new system (but you won't be the reporter of the bug in the new system and thus you won't get notified on changes anymore). Thank you and sorry for the inconvenience. ** Changed in: qemu Status: New => Incomplete -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1900122 Title: Unsupported ioctl: cmd=0xffffffff80685600 when accessing /dev/video* in aarch64 guest Status in QEMU: Incomplete Bug description: **Description:** Any attempt to work with video in aarch64 architecture emulated on x86_64 leads currently to the error "Function not implemented". For example: ``` # v4l2-ctl -l --verbose Failed to open /dev/video0: Function not implemented root@12dd9b6fcfcb:/# ll /dev/video* crw-rw---- 1 root video 81, 0 Oct 16 09:23 /dev/video0 crw-rw---- 1 root video 81, 1 Oct 16 09:23 /dev/video1 ``` **Steps to reproduce the issue:** I have a following setup: Host Hardware: x86_64 equipped with a webcam (tried different webcams) Host OS: Ubuntu 20.04.1 Guest Architecture: aarch64 Guest OS: Ubuntu 20.04 (also tried 16.x and 18.x) Emulation: quemu-user-static (also tried binfmt) Guest OS is running via Docker + QEMU ``` ➜ cat /proc/sys/fs/binfmt_misc/qemu-aarch64 enabled interpreter /usr/bin/qemu-aarch64-static flags: F offset 0 magic 7f454c460201010000000000000000000200b700 mask ffffffffffffff00fffffffffffffffffeffffff ``` **Results received:** see desrciption. **Environment:** * QEMU version: (if you can know it): ipxe-qemu-256k-compat-efi-roms/focal,now 1.0.0+git-20150424.a25a16d-0ubuntu4 all [installed,automatic] ipxe-qemu/focal-updates,now 1.0.0+git-20190109.133f4c4-0ubuntu3.2 all [installed,automatic] qemu-block-extra/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed,automatic] qemu-kvm/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed] qemu-system-common/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed,automatic] qemu-system-data/focal-updates,now 1:4.2-3ubuntu6.7 all [installed,automatic] qemu-system-gui/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed,automatic] qemu-system-x86/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed,automatic] qemu-user-binfmt/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed,automatic] qemu-user/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed] qemu-utils/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed,automatic] qemu/focal-updates,now 1:4.2-3ubuntu6.7 amd64 [installed] * Container application: Docker **Output of `docker version`, `podman version` or `singularity version`** ``` ➜ docker version Client: Docker Engine - Community Version: 20.10.0-beta1 API version: 1.40 Go version: go1.13.15 Git commit: ac365d7 Built: Tue Oct 13 18:15:22 2020 OS/Arch: linux/amd64 Context: default Experimental: true Server: Docker Engine - Community Engine: Version: 19.03.13 API version: 1.40 (minimum version 1.12) Go version: go1.13.15 Git commit: 4484c46d9d Built: Wed Sep 16 17:01:20 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.4.1 GitCommit: c623d1b36f09f8ef6536a057bd658b3aa8632828 runc: Version: 1.0.0-rc92 GitCommit: ff819c7e9184c13b7c2607fe6c30ae19403a7aff docker-init: Version: 0.18.0 GitCommit: fec3683 ``` Guest aarch64 runs in privileged mode: `docker run --privileged --device=/dev/video0:/dev/video0 --env DISPLAY=unix$DISPLAY -v $XAUTH:/root/.Xauthority -v /tmp/.X11-unix:/tmp/.X11-unix -it --rm arm64v8/ubuntu:20.04 bash` **Additional information:** I tried also binfmt way to register emulators. The output of `v4l-ctl` was a little bit different: ``` # v4l2-ctl -l Unsupported ioctl: cmd=0xffffffff80685600 Failed to open /dev/video0: Function not implemented ``` To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1900122/+subscriptions