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Re: [Qemu-ppc] [Qemu-devel] [PATCH v2 10/14] pci: allow 0 address for PC

From: Peter Maydell
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH v2 10/14] pci: allow 0 address for PCI IO regions
Date: Thu, 5 Dec 2013 23:33:48 +0000

On 5 December 2013 22:33, Michael Roth <address@hidden> wrote:
> Some kernels program a 0 address for io regions. PCI 3.0 spec
> sectio doesn't seem to disallow this.

Hmm. The last PCI spec I looked at said 0 wasn't a valid MMIO
address, so the variant of this patch I wrote a while back made it
a per PCI device flag whether a particular device let you get away
with it:

(the device in question for me was the versatile-pci host bridge).

And presumably whoever put that specific check for 0 into
QEMU had a reason for it.

On the other hand I can't now find whatever document it was
that I was reading that claimed 0 wasn't valid :-(

-- PMM

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