Is it possible to use crosvm in incus?

1

The AOSP Cuttlefish emulator uses KVM for virtualization via crosvm, but when running it in Incus, it displays the error message:

[… ERROR crosvm] exiting with error 1: no enabled hypervisor

Does anyone understand the principle behind crosvm’s detection of KVM support, or whether such nested virtualization is feasible in an Incus container?

2

Try incus config device add NAME kvm unix-char path=/dev/kvm

3

Thanks, and the error now

[ERROR crosvm] exiting with error 1: failed to open KVM device /dev/kvm
Caused by:Permission denied (os error 13)
4

After executing the above command

In container

itviewer@ubuntu24:~/Downloads/cf$ ll /dev/kvm 
crw-rw---- 1 root root 10, 232 Dec  4 15:05 /dev/kvm

In host

itviewer@JackMa:~/Downloads/cf$ ll /dev/kvm 
crw-rw----+ 1 root kvm 10, 232 Dec  4 13:48 /dev/kvm

So all I need to do is modify the user group attributes?

5

After executing sudo chown root:kvm /dev/kvm

[ERROR base::sys::linux::netlink] Received not a generic netlink controller msg
[ERROR devices::acpi] Did not find group_id corresponding to acpi_mc_group
6

Maybe try this. Inside container check what GID the kvm group has:

getent group kvm

Then check if your user inside container belongs to that group. If not:

sudo usermod -a -G kvm $LOGNAME

On the host, pass kvm to the container with the GID from the first command:

incus config device add <instance_name> kvm unix-char source=/dev/kvm path=/dev/kvm gid=993

Finally, restart your container.