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Re: KVM kernel module permission denied on foreign distro


From: Giovanni Biscuolo
Subject: Re: KVM kernel module permission denied on foreign distro
Date: Sat, 19 Jan 2019 17:22:12 +0100

Hi!

Giovanni Biscuolo <address@hidden> writes:

[...]

> I'm on Debian 9 and used to run other QEMU images via libvirt
> (e.g. virsh --connect qemu:///system start guixsd-test) as user with no
> problems (my user is in kvm and libvirt-qemu groups)
>
> please any hint on how I can use "gnu system vm" as a normal user?

I run the same command as root but get the same error (this time I'll
paste the full log)

--8<---------------cut here---------------start------------->8---
$ time sudo -i guix system vm 
/localhome/g/guix/labs/configuration/container-minimal.scm
[sudo] password for g: 
/localhome/g/guix/labs/configuration/container-minimal.scm:41:19: warning: 
'dhcp-client-service' is deprecated, use 'dhcp-client-service-type' instead
substitute: updating substitutes from 'https://ci.guix.info'... 100.0%
The following derivations will be built:
   /gnu/store/9dfr4cn5qpxp9jxj5jwp9nrjw4y4wsnr-qemu-image.drv
   /gnu/store/yhzd6g6pw3j4jpxabjbpl0qwf9j232ks-run-vm.sh.drv
building /gnu/store/9dfr4cn5qpxp9jxj5jwp9nrjw4y4wsnr-qemu-image.drv...
environment variable `PATH' set to 
`/gnu/store/aya58zrfkl10vd62vzqz9y7b54xgzpfi-qemu-minimal-3.1.0/bin:/gnu/store/5s2nib1lrd2101bbrivcl17kjx1mspw6-coreutils-8.30/bin'
creating qcow2 image of 70.00 MiB...
Formatting '/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image', fmt=qcow2 
size=73400320 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Could not access KVM kernel module: Permission denied
qemu-system-x86_64: failed to initialize KVM: Permission denied
Backtrace:
           2 (primitive-load "/gnu/store/hyaagi7v0qda56rivy893px3rvz?")
In ./gnu/build/vm.scm:
    146:2  1 (load-in-linux-vm _ #:output _ #:qemu _ #:memory-size _ ?)
In ./guix/build/utils.scm:
    616:6  0 (invoke _ . _)

./guix/build/utils.scm:616:6: In procedure invoke:
Throw to key `srfi-34' with args `(#<condition &invoke-error [program: 
"qemu-system-x86_64" arguments: ("-nographic" "-no-reboot" "-m" "256" "-object" 
"rng-random,filename=/dev/urandom,id=guixsd-vm-rng" "-device" 
"virtio-rng-pci,rng=guixsd-vm-rng" "-virtfs" 
"local,id=store_dev,path=/gnu/store,security_model=none,mount_tag=store" 
"-virtfs" "local,id=xchg_dev,path=xchg,security_model=none,mount_tag=xchg" 
"-virtfs" "local,id=tmp_dev,path=tmp,security_model=none,mount_tag=tmp" 
"-kernel" 
"/gnu/store/y5aiijqiqna1y8ypn6c0jp367813xxnc-linux-libre-4.20.3/bzImage" 
"-initrd" 
"/gnu/store/xdpsk95srxg6dvvy8pj3njxwk02pphpl-raw-initrd/initrd.cpio.gz" 
"-device" "virtio-blk,drive=myhd" "-drive" 
"if=none,file=/gnu/store/4mz1qqv7h5g5885q1aq0izlmy01knf1g-qemu-image,format=qcow2,id=myhd"
 "-enable-kvm" "-append" "panic=1 
--load=/gnu/store/wxrmx10lmyrif8136gndxhr1msnhkrf1-linux-vm-loader 
console=ttyS0" "-net" "nic,model=virtio") exit-status: 1 term-signal: #f 
stop-signal: #f] 5d2b00>)'.
builder for `/gnu/store/9dfr4cn5qpxp9jxj5jwp9nrjw4y4wsnr-qemu-image.drv' failed 
with exit code 1
build of /gnu/store/9dfr4cn5qpxp9jxj5jwp9nrjw4y4wsnr-qemu-image.drv failed
View build log at 
'/var/log/guix/drvs/9d/fr4cn5qpxp9jxj5jwp9nrjw4y4wsnr-qemu-image.drv.bz2'.
cannot build derivation 
`/gnu/store/yhzd6g6pw3j4jpxabjbpl0qwf9j232ks-run-vm.sh.drv': 1 dependencies 
couldn't be built
guix system: error: build failed: build of 
`/gnu/store/yhzd6g6pw3j4jpxabjbpl0qwf9j232ks-run-vm.sh.drv' failed
41.463 secs
--8<---------------cut here---------------end--------------->8---

so even with root it fails: maybe something to do with my libvirtd
daemon service?

WDYT?

Thanks!
Giovanni

-- 
Giovanni Biscuolo

Xelera IT Infrastructures

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