** Tags removed: aarch64 ** Tags added: arm -- 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: New 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
