RE: [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs

To:	Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Subject:	RE: [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC
From:	"Nakajima, Jun" <jun.nakajima@xxxxxxxxx>
Date:	Fri, 19 Jun 2009 16:44:24 -0700
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Thread-topic:	[Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC

Jeremy Fitzhardinge wrote on Fri, 19 Jun 2009 at 12:58:14:

>> 
>> Which if dom0 is to be redundant/restartable seems to make the
>> argument for AML living in Xen.
>> 
>> Xen has everything except the AML interpreter.
>> 
> 
> I assume that putting AML into Xen has been considered, but I don't
> anything about those deliberations.  Keir? Jun?
> 

Yes, it was one of the options years ago. We did not do that because Linux and 
Solaris (as dom0) already had the AML interpreter and it's overkill and 
redundant to have such a large component in the Xen hypervisor. Since the 
hypervisor does most of the power management (i.e. P, C, S-state, etc.) getting 
the info from dom0 today, we might want to reconsider the option. 

Jun
___
Intel Open Source Technology Center



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RE: [Xen-devel] Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just be