Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer

[Alexander Graf]

Am 12.07.2013 um 00:32 schrieb Benjamin Herrenschmidt <address@hidden>:

> On Thu, 2013-07-11 at 15:28 +0200, Alexander Graf wrote:
>> 
>> Semantically having your PCI host bridge do the endianness conversion
>> is the correct way of handling it, as that's where the conversion
>> happens. If it makes life easier to do it in the isa bridging code,
>> that's fine for me too though. But then we'll have to get rid of all
>> endianness swaps that already happen in PCI bridges.
> 
> BTW. Why would IOs to a PCI VGA device go through an "ISA bridge" of any
> kind ? PCI IO space is PCI IO space... whether there is an ISA bridge or
> not is a separate thing and PCI VGA cards certainly don't sit behind
> one.

We model a single system wide io space today and access to that one happens 
through you pci host controller. I just messed up the terminology here.

Alex

> 
> Ben.
> 
>