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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2013-05-21 at 15:34 +0100, George Dunlap wrote:
> On 05/21/2013 03:20 PM, Ian Campbell wrote:
> > On Tue, 2013-05-21 at 15:16 +0100, George Dunlap wrote:
> >> And will the Citrix PV drivers check for the existence of
> >> shutdown commands before they start a watch?
> >
> > Watches fire immediately when you register them, to allow this race to
> > be easily avoided without really having to think about it.
> 
> Well then that watch mechanism is broken, 

The firing happens in xenstored, and that certainly works everywhere
else, or all sorts of things would be broken.

That's not to say there isn't a problem with e.g. the kernels watch
event handling causing the watch which is fired to not get as far as the
appropriate handler.

> at least for values written 
> before some point in time:
> 
> # xenstore-ls -f /local/domain/10
> [...]
> /local/domain/10/control/shutdown = "poweroff"
> [...]
> 
> But the domain doesn't shut down.
> 
> Konrad, sorry to keep sending stuff your way, but I'm not sure who else 
> to bring in for this one.  The original thread is here:
> 
> http://www.gossamer-threads.com/lists/xen/devel/282467
> 
> But the problem actually has nothing to do with ACPI -- it's the PV 
> shutdown command that is getting lost after the driver registers 
> HVM_PARAM_CALLBACK_IRQ but before something else comes up that starts 
> watching ../control/shutdown.
> 
>   -George



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