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Date: Thu, 19 May 2011 08:52:02 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [RFC] Memory API
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To: Jan Kiszka <jan.kiszka@web.de>
Cc: Peter Maydell <peter.maydell@linaro.org>, Avi Kivity <avi@redhat.com>, Gleb Natapov <gleb@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

On 05/19/2011 03:30 AM, Jan Kiszka wrote:
> On 2011-05-19 10:26, Gleb Natapov wrote:
>> On Wed, May 18, 2011 at 09:27:55PM +0200, Jan Kiszka wrote:
>>>> if an I/O is to the APIC page,
>>>>     it's handled by the APIC
>>>
>>> That's not that simple. We need to tell apart:
>>>   - if a cpu issued the request, and which one =>  forward to APIC
>> And cpu mode may affect where access is forwarded to. If cpu is in SMM
>> mode access to frame buffer may be forwarded to a memory (depends on
>> chipset configuration).
>
> So we have a second use case for CPU-local I/O regions?
>
> I wonder if only a single CPU can enter SMM or if all have to.

For the i440fx, it's a chipset register (not a per-CPU register).

Maybe it's per-CPU on more modern chipsets... I'm not really sure.

Regards,

Anthony Liguori