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Re: xen interrupt system

On Tue, Aug 25, 2009 at 02:34:11PM +0200, Christoph Egger wrote:
> The issue of no ACPI is hardly a practical one these days, as there aren't
> really any system made in the last 10+ years with no ACPI.

To be blunt: that sounds like an excuse for Xen having mis-engineered an
interface which used to work on systems without ACPI so that now it
doesn't.  There are a *lot* of systems with seriously broken ACPI out
there such that they run best if ACPI is not used -- and "upgrade your
BIOS" is a similar non-answer since it often does not help.

If Xen is going to cause it to be necessary to know the order in which
Xen enumerated the ioapics, then Xen should supply that order via the
hypercall interface.  Anything else is just gratuitous breaking of code
and systems which used to work fine.


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