From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Alexander Graf <agraf@suse.de>,
qemu-ppc@nongnu.org, qemu-devel@nongnu.org,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-devel] [PATCH] spapr-pci: change endianness for io ports space
Date: Tue, 16 Jul 2013 09:06:46 +1000 [thread overview]
Message-ID: <51E48086.1040307@ozlabs.ru> (raw)
In-Reply-To: <87vc4bamst.fsf@codemonkey.ws>
On 07/16/2013 01:02 AM, Anthony Liguori wrote:
> Alexey Kardashevskiy <aik@ozlabs.ru> writes:
>
>> 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.
>
> You should try the latest qemu.git commit. There shouldn't be a problem
> anymore.
Does this mean sPAPR still needs an additional IO memory region? It looks
redundand and everything (almost) works without it...
--
Alexey
next prev parent reply other threads:[~2013-07-15 23:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-12 7:37 [Qemu-devel] [PATCH] spapr-pci: change endianness for io ports space Alexey Kardashevskiy
2013-07-12 8:59 ` [Qemu-devel] BUG report " Alexey Kardashevskiy
2013-07-12 11:25 ` Alexander Graf
2013-07-13 8:03 ` [Qemu-devel] " David Gibson
2013-07-14 13:22 ` Alexey Kardashevskiy
2013-07-15 15:02 ` Anthony Liguori
2013-07-15 23:06 ` Alexey Kardashevskiy [this message]
2013-07-16 0:28 ` Anthony Liguori
2013-07-16 0:39 ` Alexey Kardashevskiy
2013-07-16 2:05 ` Anthony Liguori
2013-07-16 2:17 ` Alexey Kardashevskiy
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