Question on stopping KVM start at boot

Question on stopping KVM start at boot

[satimis]

Hi folks.

Host - ubuntu 9.10 64bit
Virtualizer - KVM

I need to stop KVM starting at boot.

I added following 2 lines at the bottom of /etc/modprobe.d/blacklist.conf
blacklist kvm
blacklist kvm-amd


Reboot PC

It doesn't work.

$ lsmod | grep kvm
kvm_amd                41556  0
kvm                   190648  1 kvm_amd


Please what further command I have to run in order to activate the new  
blacklist.conf ?

TIA


B.R.
Stephen L

Re: Question on stopping KVM start at boot

[Bitman Zhou]

> Hi folks.
> 
> Host - ubuntu 9.10 64bit
> Virtualizer - KVM
> 
> I need to stop KVM starting at boot.
> 
> I added following 2 lines at the bottom of /etc/modprobe.d/blacklist.conf
> blacklist kvm
> blacklist kvm-amd
> 
> 
> Reboot PC
> 
> It doesn't work.
> 
> $ lsmod | grep kvm
> kvm_amd                41556  0
> kvm                   190648  1 kvm_amd
> 
> 
> Please what further command I have to run in order to activate the new  
> blacklist.conf ?

For Ubutnu, you can just use update-rc.d

sudo update-rc.d kvm disable

to disable kvm and 

sudo update-rc.d kvm enable

to enable it again.

Re: Question on stopping KVM start at boot

[Rodrigo Campos]

On Wed, Mar 10, 2010 at 04:07:09PM +0800, satimis@pacific.net.hk wrote:
> Hi folks.
> 
> Host - ubuntu 9.10 64bit
> Virtualizer - KVM
> 
> I need to stop KVM starting at boot.
> 
> I added following 2 lines at the bottom of /etc/modprobe.d/blacklist.conf
> blacklist kvm
> blacklist kvm-amd
> 
> 
> Reboot PC
> 
> It doesn't work.
> 
> $ lsmod | grep kvm
> kvm_amd                41556  0
> kvm                   190648  1 kvm_amd
> 
> 
> Please what further command I have to run in order to activate the
> new blacklist.conf ?

/etc/init.d/qemu-kvm loads the module. So you probably must not run it on start
up or teach it how to read the blacklist.

Perhaps this is more appropriate to ask on an ubuntu-specific mailing list,
since this is an ubuntu problem.





Thanks,
Rodrigo

Re: Question on stopping KVM start at boot

[Dustin Kirkland]

On Wed, Mar 10, 2010 at 3:08 AM, Bitman Zhou <bitman.zhou@sinobot.com.cn> wrote:
>> I need to stop KVM starting at boot.
>>
>> I added following 2 lines at the bottom of /etc/modprobe.d/blacklist.conf
>> blacklist kvm
>> blacklist kvm-amd
>>
>>
>> Reboot PC
>>
>> It doesn't work.
>>
>> $ lsmod | grep kvm
>> kvm_amd                41556  0
>> kvm                   190648  1 kvm_amd
>>
>>
>> Please what further command I have to run in order to activate the new
>> blacklist.conf ?
>
> For Ubutnu, you can just use update-rc.d
>
> sudo update-rc.d kvm disable
>
> to disable kvm and
>
> sudo update-rc.d kvm enable
>
> to enable it again.

Hi there,

Unfortunately, the /etc/init.d/kvm and /etc/init.d/qemu-kvm init
scripts in previous Ubuntu releases (9.10 and earlier) didn't respect
the module blacklists.  I have corrected this in Ubuntu 10.04 by using
modprobe -b.  Thus for Ubuntu 10.04 forward, you should be able to use
the blacklist appropriately.

For other release, you can disable the init script entirely as the
other responder wrote.  Or you can edit the /etc/init.d/kvm or
/etc/init.d/qemu-kvm init script and add the "-b" option to the
modprobe calls in there.


-- 
:-Dustin

Re: Question on stopping KVM start at boot

[satimis]

Hi Dustin,

Thanks for your advice.

- snip -

> Or you can edit the /etc/init.d/kvm or
> /etc/init.d/qemu-kvm init script and add the "-b" option to the
> modprobe calls in there.

$ cat /etc/init.d/kvm | grep modprobe
No printout


$ cat /etc/init.d/qemu-kvm | grep modprobe
	if modprobe "$module"

.....
         if modprobe "$module"
         then
                 log_end_msg 0
         else
                 log_end_msg 1
                 exit 1
         fi
         ;;
....


Where shall I add "-b" option?  Thanks


B.R.
Stephen

Re: Question on stopping KVM start at boot

[satimis]

Quoting Bitman Zhou <bitman.zhou@sinobot.com.cn>:

- snip -

>> Please what further command I have to run in order to activate the new
>> blacklist.conf ?
>
> For Ubutnu, you can just use update-rc.d
>
> sudo update-rc.d kvm disable
>
> to disable kvm and
>
> sudo update-rc.d kvm enable
>
> to enable it again.


Tks for your advice.


B.R.
Stephen L

Re: Question on stopping KVM start at boot

[Rodrigo Campos]

On Thu, Mar 11, 2010 at 11:59:45AM +0800, satimis@pacific.net.hk wrote:
> Hi Dustin,
> 
> >Or you can edit the /etc/init.d/kvm or
> >/etc/init.d/qemu-kvm init script and add the "-b" option to the
> >modprobe calls in there.
> 
> $ cat /etc/init.d/qemu-kvm | grep modprobe
> 	if modprobe "$module"
> 
> Where shall I add "-b" option?  Thanks

If I'm not wrong, there. That "if" is loading the module and sees the return
code to give an error if it fails to load.





Thanks,
Rodrigo

Re: Question on stopping KVM start at boot

[Dustin Kirkland]

On Wed, Mar 10, 2010 at 9:59 PM,  <satimis@pacific.net.hk> wrote:
> $ cat /etc/init.d/qemu-kvm | grep modprobe
>        if modprobe "$module"
>
> .....
>        if modprobe "$module"
>        then
>                log_end_msg 0
>        else
>                log_end_msg 1
>                exit 1
>        fi
>        ;;
> ....
>
>
> Where shall I add "-b" option?  Thanks

modprobe -b says "respect the blacklists".  See:
 * http://manpages.ubuntu.com/manpages/lucid/en/man8/modprobe.8.html

       -b --use-blacklist
              This  option  causes modprobe to apply the blacklist commands in
              the configuration files (if any) to module names as well. It  is
              usually used by udev(7).

So you would change the lines that say "if modprobe ..." to "if modprobe -b ..."

:-Dustin

Re: Question on stopping KVM start at boot

[satimis]

Hi Dustin,


- snip -

>> Where shall I add "-b" option?  Thanks
>
> modprobe -b says "respect the blacklists".  See:
>  * http://manpages.ubuntu.com/manpages/lucid/en/man8/modprobe.8.html
>
>        -b --use-blacklist
>               This  option  causes modprobe to apply the blacklist   
> commands in
>               the configuration files (if any) to module names as   
> well. It  is
>               usually used by udev(7).
>
> So you would change the lines that say "if modprobe ..." to "if   
> modprobe -b ..."


Your advice works for me.  Thanks


B.R.
Stephen