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

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

CCing the guys who know about qemu.

On Tue, 2013-05-14 at 14:13 +0100, Diana Crisan wrote:
> This is problem 3 of 3 problems we are having with live migration
> and/or ACPI on Xen-4.3 and Xen-4.2.
> 
> Any help would be appreciated.
> 
> Detailed description of problem:
> 
> 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.

> 
> This is replicable every time.
> 
> How to replicate:
> 1. Take a machines running xen-4.3-rc1 version of Xen on Ubuntu Precise with 
> 3.5.0-23-generic kernel.
> 2. Use the xl.conf below as a configuration file.
> 3. Create a VM using Ubuntu Precise and 3.5.0-23 generic.
> 4. Start the VM
> 5. Immediately (before boot is completed) run 'xl shutdown' or 'xl reboot'. 
> As ACPI is not initialised, this will have no effect.
> 6. Wait until domU has completed booting.
> 7. Run 'xl shutdown' or 'xl reboot' again.
> 
> Expected results:
> 
> At step 7, domU will shutdown or reboot as appropriate
> 
> Actual results:
> 
> domU does not shutdown or reboot and it is necessary to 'xl des' the domU to 
> stop it.
> 
> Notes:
> 
> On xen-4.2, a similar thing happens.
> 
> --xl.conf--
> 
> builder='hvm'
> memory = 512
> name = "416-vm"
> vcpus=1
> disk = [ 'tap:qcow2:/root/diana.qcow2,xvda,w' ]
> vif = ['mac=00:16:3f:1d:6a:c0, bridge=defaultbr']
> sdl=0
> opengl=1
> vnc=1
> vnclisten="0.0.0.0"
> vncdisplay=0
> vncunused=0
> vncpasswd='p'
> stdvga=0
> serial='pty'
> 
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