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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> |
| Delivery-date: | Fri, 04 Aug 2006 03:42:12 -0700 |
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| Reply-to: | Christian.Limpach@xxxxxxxxxxxx |
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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.
christian
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