Re: [Xen-devel] Early ACPI events prevent subsequent ACPI functionality on xen 4.3 + HVM domU

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Sat, May 18, 2013 at 10:55 AM, Alex Bligh <alex@xxxxxxxxxxx> wrote:
> Ian,
>
>
> --On 17 May 2013 18:35:51 +0100 Ian Campbell <ian.campbell@xxxxxxxxxx>
> wrote:
>
>>> We are using Xen-4.3-rc1 with dom0 running Ubuntu Precise and
>>> 3.5.0-23-generic kernel, and domU running Ubuntu Precise (12.04) cloud
>>> images running 3.2.0-39-virtual. We are using the xl.conf below on
>>> qemu-upstream-dm and HVM and two identical sending and receiving
>>> machines (hardware and software)
>>>
>>> If a dom-U HVM server is started with ACPI enabled, and an ACPI event
>>> (such as shutdown or reboot) is sent to domU before the BIOS and/or
>>> operating system in the dom-U has initialised ACPI, then all
>>> subsequent ACPI events are ignored.
>>
>>
>> I suppose something must be getting latched and since no one was around
>> at the time to clear it no further events are possible. Not sure if this
>> is a qemu or a guest issue though.
>
>
> I can confirm it does not happen with KVM with the same guest, and it
> happens with multiple Linux guests on Xen. Our test suite triggers it
> every time.
>
> It's a pain because if someone starts a server by accident and immediately
> goes to shut it down, they have to do an ungraceful destroy rather than
> a clean shutdown.

So this appears to be an xl toolstack thing.  I managed to reproduce
your results using "xl shutdown -F [domain]"; but if you then do "xl
trigger [domian] power", the domain shuts down as normal.

That at least should give you a work-around so you don't have to do
"xl destroy".

I'll take a look and see if I can figure out what's going on...

 -George

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