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

To: <Christian.Limpach@xxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH]HVM acpi timer update
From: "Wang, Winston L" <winston.l.wang@xxxxxxxxx>
Date: Fri, 4 Aug 2006 11:01:07 -0700
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Tang Liang <tangliang@xxxxxxxxxx>
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Thread-index: Aca3spPI6Q3YZtViTwK1Lhy5CRt8IgAPQUIg
Thread-topic: [Xen-devel] [PATCH]HVM acpi timer update
Yes, Don't worry about SCI now since we don't have support for hvm guest
device power management for device idle timer,

Christian Limpach wrote:
> 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.
>      christian

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