Re: Early ACPI events prevent subsequent ACPI functionality on xen 4.3 + HVM domU

[Alex Bligh <alex@alex.org.uk>]

Ian,

--On 17 May 2013 18:35:51 +0100 Ian Campbell <ian.campbell@citrix.com> 
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.

-- 
Alex Bligh