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Re: [Qemu-ppc] [PATCH] spapr-pci: change endianness for io ports space

From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [PATCH] spapr-pci: change endianness for io ports space
Date: Sun, 14 Jul 2013 23:22:28 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6

On 07/13/2013 06:03 PM, David Gibson wrote:
> On Fri, Jul 12, 2013 at 05:37:19PM +1000, Alexey Kardashevskiy wrote:
>> sPAPR PHB emulates IO ports on PCI via a special memory region which
>> routes all reads/writes further via cpu_in*/cpu_out* which are eventually
>> processed by MemoryRegionOps implemented by devices.

> Hrm.  That double dispatch was a workaround for bugs in the plain
> memory region dispatching which meant we couldn't directly map regions
> in memory space to IO areas.
> It would be worth checking if that workaround is still necessary.

Hm. Good point, thanks! It seems memory_region_init_io is not necessary any
more. Will make a patch for it.


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