Re: [Qemu-ppc] [PATCH|RFC 1/1] pci: allow 0 address for PCI IO/MEM regions

[Alexander Graf]

On 07/22/15 18:17, Michael S. Tsirkin wrote:
> On Wed, Jul 22, 2015 at 01:54:59PM +0200, Laurent Vivier wrote:
> > From: Michael Roth <address@hidden>
> >
> > Some kernels program a 0 address for io regions. PCI 3.0 spec
> > section 6.2.5.1 doesn't seem to disallow this.
> >
> > Signed-off-by: Michael Roth <address@hidden>
> > [lvivier: add accept_addr_0 in PCIBus to conditionally allow addr 0,
> >   as this can break other architectures]
> > Signed-off-by: Laurent Vivier <address@hidden>
> I guess it's a solution - though I'd rather fix up priorities
> for PC and others.

Won't this break Linux? IIRC there was a check in Linux that declares 
IO==0 addresses as invalid on PCI enumeration.


Alex