RE: [Xen-devel] ACPI fixed event or General Purpose Event to HVM guest.

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From:Bill Rieske
>Sent: 2008年7月17日 5:55
>
>Has there been any work done on getting an ACPI fixed event or 
>perhaps a general
>purpose event delivered to an HVM guest.  Whereby, the HVM 
>guests OSPM could consume the event and act accordingly.

Now Xen support live migration with VT-d assigned device, which 
is based on a virtual ACPI hotplug mechanism, where one specific
GPE bit is created within Qemu. You can check piix4acpi.c in
Qemu for reference.

>
>Or Perhaps better stated how would one go about passing an 
>ACPI fixed event or general purpose event that was raised and 
>consumed by dom0 and subsequently pass the event on to each of 
>the HVM domu's.  
>

But if you're talking about passing through a physical ACPI event
to HVM, it seems a bit tricky since not all ACPI events are 
waterfalled to user space, and even when some does, it doesn't 
make sense to simply forward already-consumed event to HVM,
as Qemu ACPI table is different from physical one. 

So, what's your main purpose here?

Thanks,
Kevin

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