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Subject: Re: [Qemu-devel] Re: [PATCH 1/6] Make config space accessor host
	bus trapable
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
In-Reply-To: <20100104213021.GC21488@redhat.com>
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Date: Tue, 05 Jan 2010 08:53:52 +1100
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Blue Swirl <blauwirbel@gmail.com>, Isaku Yamahata <yamahata@valinux.co.jp>, Alexander Graf <agraf@suse.de>, Aurelien Jarno <aurelien@aurel32.net>, QEMU Developers <qemu-devel@nongnu.org>


> Yes, but I think how you program your host to pci bridge is platform specific,
> the standard (mostly) applies to what happens below the bridge.  There's
> no real standard for how PCI host bridge is connected to processor
> AFAIK, it's by luck we can share code there at all.

Well, yes and no ... there's a standard on how a PCI host bridge is
connected in the sense that how normal MMIO accesses go through in term
of endianness is well defined.

How you actually issue config space cycles is a property of a given
bridge. How you issue IO cycles as well in fact.

Cheers,
Ben.