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Re: [Qemu-ppc] [Qemu-devel] [PATCH 08/12] pci: allow 0 address for PCI I


From: Peter Maydell
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 08/12] pci: allow 0 address for PCI IO regions
Date: Thu, 28 Aug 2014 22:33:02 +0100

On 28 August 2014 22:21, Michael Roth <address@hidden> wrote:
> But I guess there's still a separate issue, where there's a high liklihood 
> that
> a 0 address would conflict with some hard-wired IO address? Wouldn't this be a
> guest bug though?

Even if it's a guest bug, we should act like the hardware does
if the guest does this. If that differs between PCI controllers
then we need a flag so the host controller model can select
the required behaviour. (The versatile PB PCI controller we
model does have "address 0 is valid", and we'd need to have
this working if we implemented DMA accesses properly.)

-- PMM



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