Broken loadvm ?

Broken loadvm ?

[Alpár Török]

KVM module:

modinfo kvm :
filename:       /lib/modules/2.6.33-30-default/kernel/arch/x86/kvm/kvm.ko
license:        GPL
author:         Qumranet
srcversion:     611CD56E712705875D0E7BB
depends:
vermagic:       2.6.33-30-default SMP mod_unload modversions
parm:           oos_shadow:bool
parm:           ignore_msrs:bool

qemu-kvm :

(qemu) info version
0.11.0 (qemu-kvm-0.11.0-4.5.2)

command line :

qemu-kvm -drive
file=/srv/pvmd/vm/templates/XP_32_SP3/disk.qcow2,cache=writeback,index=0,format=qcow2,boot=on
-vnc :10 -monitor stdio -net nic,model=e1000,macaddr=52:54:00:12:34:00
  -net tap,ifname=tap0,script=no -cpu core2duo -m 512

I have a freshly installed win xp. I was trying to create a snapshot
with savevm from the monitor. With cace=writeback performance was
good, but it *seemed* that after a loadvm (from monitor or command
line) the VM was frozen. I played with it a couple of hours before
realizing that in fact, it's only the mouse that doesn't work after a
loadvm (trough vnc, the system is remote). At least i hope that every
other device works as expected. If the loadvm happens in the same
session as savevm everything works as expected. I also tested on a
2.6.27.39 with kvm-88 it all works ok.

Is this a bug?

Re: Broken loadvm ?

[Alpár Török]

PS:  It just occurred to me , that  it does  indeed freeze and cause a
100% CPU usage. At least i can say for sure that network, serial line,
keyboard, nor mouse work. If  loadvm is loaded from the command line.
If loaded from the monitor, everything seams to work, except the
mouse.  After a -loadvm from the command line, repeating the command
from the monitor doesn't unfreeze it.

i am really stuck with this. Any help is greatly appreciated, as
downgrading is not an option.

Re: Broken loadvm ?

[Marcelo Tosatti]

On Tue, Mar 16, 2010 at 05:25:13PM +0200, Alpár Török  wrote:
> PS:  It just occurred to me , that  it does  indeed freeze and cause a
> 100% CPU usage. At least i can say for sure that network, serial line,
> keyboard, nor mouse work. If  loadvm is loaded from the command line.
> If loaded from the monitor, everything seams to work, except the
> mouse.  After a -loadvm from the command line, repeating the command
> from the monitor doesn't unfreeze it.
> 
> i am really stuck with this. Any help is greatly appreciated, as
> downgrading is not an option.

Upgrade to qemu-kvm-0.12.3?

Re: Broken loadvm ?

[Alpár Török]

Indeed,  0.12.3 fixes the problem
Alpar Torok



2010/3/17 Marcelo Tosatti <mtosatti@redhat.com>:
> On Tue, Mar 16, 2010 at 05:25:13PM +0200, Alpár Török  wrote:
>> PS:  It just occurred to me , that  it does  indeed freeze and cause a
>> 100% CPU usage. At least i can say for sure that network, serial line,
>> keyboard, nor mouse work. If  loadvm is loaded from the command line.
>> If loaded from the monitor, everything seams to work, except the
>> mouse.  After a -loadvm from the command line, repeating the command
>> from the monitor doesn't unfreeze it.
>>
>> i am really stuck with this. Any help is greatly appreciated, as
>> downgrading is not an option.
>
> Upgrade to qemu-kvm-0.12.3?
>