failed with KVM acceleration not available

[markintouch]

Operating system

Ubuntu 22.04

Description

start docker compose and get the error.
ERROR: KVM acceleration not available (no write access), this will cause a major loss of performance.

Here is the output of kvm-ok
$ sudo kvm-ok
INFO: /dev/kvm exists
KVM acceleration can be used

And I tried Priviledged:true, the same. And also I run use sudo.
Are you use a special user to run docker?
This is weird.

Docker compose

services:
windows:
container_name: windows
image: dockurr/windows-arm
environment:
VERSION: "11"
DISK_SIZE: "64G"
RAM_SIZE: "12G"
CPU_CORES: "4"
VGA: "virtio-gpu"
devices:
- /dev/kvm
cap_add:
- NET_ADMIN
ports:
- 8006:8006
- 3389:3389/tcp
- 3389:3389/udp
stop_grace_period: 2m
volumes:
- /var/win:/storage

Docker log

ERROR: KVM acceleration not available (no write access), this will cause a major loss of performance.

Screenshots (optional)

No response

[kroese]

The error says no write access so it seems like a permission issue for the /dev/kvm file.

Probably you need to do something like chmod 777 /dev/kvm to give write permission, but I am not sure exactly.

[markintouch]

I tried chmod 666 /dev/kvm，the same. The current user has write permission. Actually I deployed dockur/mac at the same server before, with no error report about KVM permission.

[kroese]

Very strange! The code is almost identical between both projects.

But I think the current user has nothing to do with it, the Docker engine runs as root, so it is the root user who needs write permissions to the kvm file, not the current user.

[kroese]

@sangriaaa34 Because both depend on https://github.com/qemus/qemu-docker