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RE: [xen-devel][PATCH] Battery Management

>From: Ian Jackson
>Sent: Tuesday, October 14, 2008 11:05 PM
>Kamala Narasimhan writes ("RE: [xen-devel][PATCH] Battery Management"):
>> There isn't a whole range of VT-x enabled laptops I could
>get my hands
>> on to better answer your question.  However, given the
>current battery
>> firmware implementation trend, the pass-through mode is
>likely to work
>> on laptops that uses CMBattery interface.  The goal was to attempt to
>> put the base vACPI implementation that can be fine tuned as
>we go along
>> to better support a whole range of VT-x enabled laptops shipped in
>> future.  That said, I have tested pass-through mode on the hardware I
>> could get hold of (that uses CMBattery interface) and seen it work.
>I'm obviously missing something obvious here.  I wasn't able to easily
>find out what `CMBattery' is (perhaps I need to read a suitable volume
>of ACPI spec) but laptops have been having ACPI-based battery
>management for quite a while.

ACPI spec defines two types of batteriers: smart battery and control
method battery. Smart battery is controlled by embedded controller,
while the latter provides full ACPI control methods to OSPM.

>You mention a shortage of VT-x enabled laptops but a quick websearch
>suggests there are plenty of AMD-V-capable laptops.
>Dare I ask, what about PV guests ?  Obviously access to the host
>battery is not supported for right now but what is the plan ?

For PV guests it's more tough question, as no ACPI is supported in
PV guest by far.


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