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Re: [Xen-devel] [PATCH]HVM acpi timer update

To: "Wang, Winston L" <winston.l.wang@xxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH]HVM acpi timer update
From: "Christian Limpach" <christian.limpach@xxxxxxxxx>
Date: Fri, 4 Aug 2006 11:41:42 +0100
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Tang Liang <tangliang@xxxxxxxxxx>
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On 7/28/06, Wang, Winston L <winston.l.wang@xxxxxxxxx> wrote:
Using vm_clock counter delta to calculate acpi timer is an ideal
solution provided os only accessing acpi timer port using polling mode.

Currently acpi implementation using acpi only event model without power
manager support. Guest OS only do acpi timer polling. At the time when
we need to add hvm guest device acpi power manager support, acpi timer
will be not only being used as platform profiling in polling mode but
also need to severe to generate SCI when timer expired.

Ah I see, but even in that case, we should be able to setup a qemu
timer to fire only once the pm1_timer will reach zero or whatever the
condition for generating an SCI is.


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