kvm guests are not able to restart

kvm guests are not able to restart

[Farkas Levente]

hi,
i've got a centos-5 x86_64 kvm-35 host system with one centos-5 i386 and
one x86_64 guests. but none of the guest are able to restart. ie. i
login to the guests and restart it. it start's as normal reboot, but
after the last command (shuting down md device) it's do nothing, but in
virt-manager i see 50% load on the guest. the biggest problem currently
i can't find any way to restart any guest's other then shutdown and use
virt-manager and restart them:-(
what can be a problem? is it a known bug or it's just not working for me?
thanks in advance.

my system:
kernel-2.6.18-8.1.8.el5
kernel-headers-2.6.18-8.1.8.el5
kmod-kvm-35-1.2.6.18_8.1.8.el5
kvm-35-1
libvirt-0.3.2-2
libvirt-python-0.3.2-2
python-virtinst-0.300.0-1
virt-manager-0.5.0-1
virt-top-0.3.2.5-1
virt-viewer-0.0.2-1

-- 
  Levente                               "Si vis pacem para bellum!"

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Re: kvm guests are not able to restart

[Luca]

On 9/3/07, Farkas Levente <lfarkas-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org> wrote:
> hi,
> i've got a centos-5 x86_64 kvm-35 host system with one centos-5 i386 and
> one x86_64 guests. but none of the guest are able to restart. ie. i
> login to the guests and restart it. it start's as normal reboot, but
> after the last command (shuting down md device) it's do nothing, but in
> virt-manager i see 50% load on the guest. the biggest problem currently
> i can't find any way to restart any guest's other then shutdown and use
> virt-manager and restart them:-(
> what can be a problem? is it a known bug or it's just not working for me?

It's known, but ATM there's no fix available. For more details see:
http://thread.gmane.org/gmane.comp.emulators.kvm.devel/5651/focus=6003
and following mails.

Luca

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Re: kvm guests are not able to restart

[Farkas Levente]

Luca wrote:
> On 9/3/07, Farkas Levente <lfarkas-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org> wrote:
>> hi,
>> i've got a centos-5 x86_64 kvm-35 host system with one centos-5 i386 and
>> one x86_64 guests. but none of the guest are able to restart. ie. i
>> login to the guests and restart it. it start's as normal reboot, but
>> after the last command (shuting down md device) it's do nothing, but in
>> virt-manager i see 50% load on the guest. the biggest problem currently
>> i can't find any way to restart any guest's other then shutdown and use
>> virt-manager and restart them:-(
>> what can be a problem? is it a known bug or it's just not working for me?
> 
> It's known, but ATM there's no fix available. For more details see:
> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/5651/focus=6003
> and following mails.

is this really true? this means kvm are not usable any real environment
since imho the feature to be able to reboot a server is essential!

-- 
  Levente                               "Si vis pacem para bellum!"

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Re: kvm guests are not able to restart

[Avi Kivity]

Farkas Levente wrote:
> Luca wrote:
>   
>> On 9/3/07, Farkas Levente <lfarkas-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org> wrote:
>>     
>>> hi,
>>> i've got a centos-5 x86_64 kvm-35 host system with one centos-5 i386 and
>>> one x86_64 guests. but none of the guest are able to restart. ie. i
>>> login to the guests and restart it. it start's as normal reboot, but
>>> after the last command (shuting down md device) it's do nothing, but in
>>> virt-manager i see 50% load on the guest. the biggest problem currently
>>> i can't find any way to restart any guest's other then shutdown and use
>>> virt-manager and restart them:-(
>>> what can be a problem? is it a known bug or it's just not working for me?
>>>       
>> It's known, but ATM there's no fix available. For more details see:
>> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/5651/focus=6003
>> and following mails.
>>     
>
> is this really true? this means kvm are not usable any real environment
> since imho the feature to be able to reboot a server is essential!
>   

It's true unfortunately.  A fix will be available shortly.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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Re: kvm guests are not able to restart

[Luca]

On 9/3/07, Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org> wrote:
> Farkas Levente wrote:
> > Luca wrote:
> >
> >> On 9/3/07, Farkas Levente <lfarkas-lWVWdrzSO4GHXe+LvDLADg@public.gmane.org> wrote:
> >>
> >>> hi,
> >>> i've got a centos-5 x86_64 kvm-35 host system with one centos-5 i386 and
> >>> one x86_64 guests. but none of the guest are able to restart. ie. i
> >>> login to the guests and restart it. it start's as normal reboot, but
> >>> after the last command (shuting down md device) it's do nothing, but in
> >>> virt-manager i see 50% load on the guest. the biggest problem currently
> >>> i can't find any way to restart any guest's other then shutdown and use
> >>> virt-manager and restart them:-(
> >>> what can be a problem? is it a known bug or it's just not working for me?
> >>>
> >> It's known, but ATM there's no fix available. For more details see:
> >> http://thread.gmane.org/gmane.comp.emulators.kvm.devel/5651/focus=6003
> >> and following mails.
> >>
> >
> > is this really true? this means kvm are not usable any real environment
> > since imho the feature to be able to reboot a server is essential!
> >
>
> It's true unfortunately.  A fix will be available shortly.

I haven't tested but reboot=b ("go back in real mode and pass control
to BIOS") may work.

Luca

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