Issues starting VM's in KVM. - blkio device weight is valid only for bfq or cfq scheduler

KVM
1

EDIT by Patrick:

See KVM troubleshooting: Request operation not valid: blkio device weight is valid only for bfq or cfq scheduler

Original post:

I’m new to KVM and I was trying to set it up. After following the instructions, I get this error message. I did extract the qcow images on an external drive since my host machine doesn’t have much space. Not sure if that would effect anything since I moved them as in the instructions for KVM. Any idea?

Error starting domain: Requested operation is not valid: blkio device weight is valid only for bfq or cfq scheduler

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 66, in newfn
    ret = fn(self, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/object/domain.py", line 1279, in startup
    self._backend.create()
  File "/usr/lib/python3/dist-packages/libvirt.py", line 1234, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirt.libvirtError: Requested operation is not valid: blkio device weight is valid only for bfq or cfq scheduler
2

https://www.oilandfish.com/posts/practical-anonymity-political-religious-dissidents.html#10-7

EDIT by Patrick:
https://web.archive.org/web/20221219151033/https://www.oilandfish.com/posts/practical-anonymity-political-religious-dissidents.html#10-7

1 Like
3

Thank you! This may be a dumb question, but what is the command to edit the xml files? Everything I’ve tried just shows the file as empty and no lines to remove. I tried sudo edit /etc/apt/Whonix-Gateway-XFCE-15.0.1.3.9.xml for example.

4

sudo virsh edit Whonix-Workstation

or Whonix-Gateway

5

Srarting Whonix-Gateway or Whonix-Workstation VMs produces the following error.:

Error starting domain: Requested operation is not valid: blkio device weight is valid only for bfq or cfq scheduler

Traceback (most recent call last):
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 75, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 111, in tmpcb
callback(*args, **kwargs)
File “/usr/share/virt-manager/virtManager/object/libvirtobject.py”, line 66, in newfn
ret = fn(self, *args, **kwargs)
File “/usr/share/virt-manager/virtManager/object/domain.py”, line 1279, in startup
self._backend.create()
File “/usr/lib/python3/dist-packages/libvirt.py”, line 1234, in create
if ret == -1: raise libvirtError (‘virDomainCreate() failed’, dom=self)
libvirt.libvirtError: Requested operation is not valid: blkio device weight is valid only for bfq or cfq scheduler

Following these steps seems to fix the issue.
Notice that ParrotOS is a Debian-based distribution.Does the documentation need updating or is this in fact a bug?

6

Is parrot on stable or testing? I guess we’ll soon find out if this is a problem on 11 and I will just have to throw this setting out, but I’d rather not because it provides resource restrictions against DoS attacks.

7

ParrotOS is based on Testing. Can you share your sources about Dos attacks?

8

Don’t have it on hand, but by the rationale of putting 2 and 2 together, limiting a common resource on a machine (whether RAM, CPU or iops in this case) would limit potential for abuse by a compromised VM and also help security by not affecting other processes in visible ways - which can act as a sidechannel.

9

I see.Maybe setting and flags might he4lp the issue.As mentioned here and here.

10

Ok. If I run into this problem on Bullseye I will remove it.

1 Like
11

4 posts were split to a new topic: Tor Browser Globe Icon Missing

12

3 posts were split to a new topic: RIP: 0010:switch_mm_irqs_off+0x2a5/0x4f0

13

Hello I installed KVM Whonix on a new machine and for some reason I can’t edit the files using virsh. It won’t let me remove the lines so I can start the vms. Any idea why? My host is Kali.

14

Are you starting the virsh command with sudo/su? It needs privileges to work.

What error do you see when you save the modified file? Maybe you forget to save it and so it doesn’t take effect? I need more details.

1 Like
15

Tried to install in KVM VirtManager. imported .xml files and it’s all in the images folder. Got this error trying to start Gateway:

Error starting domain: Requested operation is not valid: blkio device weight is valid only for bfq or cfq scheduler

Traceback (most recent call last):
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 75, in cb_wrapper
callback(asyncjob, *args, **kwargs)
File “/usr/share/virt-manager/virtManager/asyncjob.py”, line 111, in tmpcb
callback(*args, **kwargs)
File “/usr/share/virt-manager/virtManager/object/libvirtobject.py”, line 66, in newfn
ret = fn(self, *args, **kwargs)
File “/usr/share/virt-manager/virtManager/object/domain.py”, line 1279, in startup
self._backend.create()
File “/usr/lib/python3/dist-packages/libvirt.py”, line 1234, in create
if ret == -1: raise libvirtError (‘virDomainCreate() failed’, dom=self)
libvirt.libvirtError: Requested operation is not valid: blkio device weight is valid only for bfq or cfq scheduler

16

See KVM troubleshooting: Request operation not valid: blkio device weight is valid only for bfq or cfq scheduler