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Re: [Xen-devel] Problems booting latest xen pv-ops linux kernel

To: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Problems booting latest xen pv-ops linux kernel
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 25 Nov 2009 11:34:24 -0800
Cc: Goswin von Brederlow <goswin-v-b@xxxxxx>, Xen Developers List <xen-devel@xxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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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

> - xen 3.5 tip &&                            boots fine
> - jeremy's tree (without hypervisor)            boots fine
> - xen 3.5 tip && jeremy's tree                  doesn't boot 
> completely at gives the problems reported.
> With the option on enabled, it also boots xen 3.5 tip && 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.


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