linux-kernel - Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC

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Date:	Thu, 18 Jun 2009 18:38:41 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Keir Fraser <keir.fraser@...citrix.com>
Subject: Re: [PATCH RFC] x86/acpi: don't ignore I/O APICs just because there's no local APIC

Jeremy Fitzhardinge <jeremy@...p.org> writes:

> Ah, OK.  The pirq is set up for a specific domain rather than being
> global (otherwise it would need some kind of "which domain can access
> which pirq" table).  dom0 can either create a pirq for itself or someone
> else, and the final user of the pirq binds it to a domain-local evtchn.
>
> I think.  I really haven't looked into the pci-passthrough parts very
> closely yet.

I certainly could not find the code that would let you setup a pirq for another
domain.  In fact the pirq code aka alloc_vectors appears to hard code dom0
in Xen 3.4.

pci-passthrough since it is domU, and since you describe it as well isolated and
comparatively simple should be a shoe in.

Further as you describe it pci-passthrough is a subset of what we have to do for dom0.
So if we can I would like to see the pci passthrough code get merged first.

Eric
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