initiating linux guest shutdown from host

initiating linux guest shutdown from host

[extmaillist]

Hi,
I'm trying libvirt-0.4.2, it should support initiating guest shutdown for 
KVM domains. But for some reason it doesn't work for me, I'm using linux 
guests with external kernel, if I run poweroff from within the domain, it 
shutdowns correctly, but trying to shutdown the domain from host using 
libvirt doesn't have any effect.
Does somebody know where the problem could be? How does sending shutdown 
work in KVM/qemu at all? How can I debug it?
thanks in advance!
BR
nik


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Re: initiating linux guest shutdown from host

[Luca Tettamanti]

On Wed, Apr 23, 2008 at 10:40 AM,  <extmaillist@linuxbox.cz> wrote:
> Hi,
>  I'm trying libvirt-0.4.2, it should support initiating guest shutdown for
>  KVM domains. But for some reason it doesn't work for me, I'm using linux
>  guests with external kernel, if I run poweroff from within the domain, it
>  shutdowns correctly, but trying to shutdown the domain from host using
>  libvirt doesn't have any effect.
>  Does somebody know where the problem could be? How does sending shutdown
>  work in KVM/qemu at all? How can I debug it?

libvirt sends "system_powerdown" to the monitor; is ACPI is enabled
then the guest sees the event but it's free to ignore it (it's the
same as pressing the power button on a real machine: the OS sees the
event and may start the shutdown, ask the user what to do, ignore it,
etc.); e.g. the default ACPI script of the debian stops the desktop
manager if it's running but doesn't shut down the machine. If the ACPI
daemon is not running in the guest then the event is lost...

Luca

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Re: initiating linux guest shutdown from host

[extmaillist]

On Wed, 23 Apr 2008, Luca Tettamanti wrote:

> libvirt sends "system_powerdown" to the monitor; is ACPI is enabled
> then the guest sees the event but it's free to ignore it (it's the
> same as pressing the power button on a real machine: the OS sees the
> event and may start the shutdown, ask the user what to do, ignore it,
> etc.); e.g. the default ACPI script of the debian stops the desktop
> manager if it's running but doesn't shut down the machine. If the ACPI
> daemon is not running in the guest then the event is lost...
>
> Luca
>
>

Hi Luca,
thanks for the answer. Well, then it works as I expected. I already tried 
starting acpid in debug mode, but system doesn't seem to receive any 
event, although according to dmesg, ACPI itself seems to work (and I can 
poweroff from the guest)

n.


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Re: initiating linux guest shutdown from host

[Avi Kivity]

extmaillist@linuxbox.cz wrote:
>
>
> On Wed, 23 Apr 2008, Luca Tettamanti wrote:
>
>   
>> libvirt sends "system_powerdown" to the monitor; is ACPI is enabled
>> then the guest sees the event but it's free to ignore it (it's the
>> same as pressing the power button on a real machine: the OS sees the
>> event and may start the shutdown, ask the user what to do, ignore it,
>> etc.); e.g. the default ACPI script of the debian stops the desktop
>> manager if it's running but doesn't shut down the machine. If the ACPI
>> daemon is not running in the guest then the event is lost...
>>
>> Luca
>>
>>
>>     
>
> Hi Luca,
> thanks for the answer. Well, then it works as I expected. I already tried 
> starting acpid in debug mode, but system doesn't seem to receive any 
> event, although according to dmesg, ACPI itself seems to work (and I can 
> poweroff from the guest)
>   

A recent regression caused powerdown SCI to stop working.  I've reverted 
this and it should work again in kvm-68.

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


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Re: initiating linux guest shutdown from host

[extmaillist]

Hi Avi,
thanks for info. Can You tell me which commit has caused the problem so I 
can revert it in my testing sources? I don't see any reverts in git (yet).
thanks!
n.





On Wed, 23 Apr 2008, Avi Kivity wrote:

> extmaillist@linuxbox.cz wrote:
>> 
>> 
>> On Wed, 23 Apr 2008, Luca Tettamanti wrote:
>>
>> 
>>> libvirt sends "system_powerdown" to the monitor; is ACPI is enabled
>>> then the guest sees the event but it's free to ignore it (it's the
>>> same as pressing the power button on a real machine: the OS sees the
>>> event and may start the shutdown, ask the user what to do, ignore it,
>>> etc.); e.g. the default ACPI script of the debian stops the desktop
>>> manager if it's running but doesn't shut down the machine. If the ACPI
>>> daemon is not running in the guest then the event is lost...
>>> 
>>> Luca
>>> 
>>>
>>> 
>> 
>> Hi Luca,
>> thanks for the answer. Well, then it works as I expected. I already tried 
>> starting acpid in debug mode, but system doesn't seem to receive any event, 
>> although according to dmesg, ACPI itself seems to work (and I can poweroff 
>> from the guest)
>> 
>
> A recent regression caused powerdown SCI to stop working.  I've reverted this 
> and it should work again in kvm-68.
>
> -- 
> Do not meddle in the internals of kernels, for they are subtle and quick to 
> panic.
>
>

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Re: initiating linux guest shutdown from host

[Avi Kivity]

extmaillist@linuxbox.cz wrote:
> Hi Avi,
> thanks for info. Can You tell me which commit has caused the problem 
> so I can revert it in my testing sources? I don't see any reverts in 
> git (yet).

6bb0805aeabd5c6ef5408f57c7da5ca6385dd0f5.


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


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Re: initiating linux guest shutdown from host

[extmaillist]

My fault, of course I couldn't find, I was looking into kvm.git and not 
kvm-userspace.git :-/
but anyways, it works properly now, thanks a lot!
n.

On Wed, 23 Apr 2008, Avi Kivity wrote:

> extmaillist@linuxbox.cz wrote:
>> Hi Avi,
>> thanks for info. Can You tell me which commit has caused the problem so I 
>> can revert it in my testing sources? I don't see any reverts in git (yet).
>
> 6bb0805aeabd5c6ef5408f57c7da5ca6385dd0f5.
>
>
> -- 
> Do not meddle in the internals of kernels, for they are subtle and quick to 
> panic.
>
>

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