On 5 December 2013 22:33, Michael Roth <mdr...@linux.vnet.ibm.com> wrote: > Some kernels program a 0 address for io regions. PCI 3.0 spec > sectio 6.2.5.1 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: http://patchwork.ozlabs.org/patch/269133/ (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 :-( thanks -- PMM
