From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: Problems booting latest xen pv-ops linux kernel
Date: Wed, 25 Nov 2009 11:34:24 -0800
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To: Sander Eikelenboom <linux@eikelenboom.it>
Cc: Goswin von Brederlow <goswin-v-b@web.de>, Xen Developers List <xen-devel@lists.xensource.com>, Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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On 11/25/09 03:46, Sander Eikelenboom wrote:
> It seems with the bios option "ACPI APIC" on disabled:
> (BTW the description of this bios option is: "Allows you to enable or disable the ACPI support in the APIC, When enabled the ACPI APIC table pointer is included in the RSDT pointer list.")
>   

I wonder what the rationale for this is?  I guess for some legacy OS
support?

> - xen 3.5 tip && 2.6.18.8-xen                            boots fine
> - 2.6.31.6 jeremy's tree (without hypervisor)            boots fine
> - xen 3.5 tip && 2.6.31.6 jeremy's tree                  doesn't boot completely at gives the problems reported.
>
> With the option on enabled, it also boots xen 3.5 tip && 2.6.31.6 fine, but for what i recall i have seen the same problem occur rarely too.
>   

I think we're approaching the point of officially not supporting legacy
modes of operation (non-ACPI, non-APIC).  At the moment we're trying to
support them, but it just adds extra complexity for what I suspect is
little value.

    J