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Date: Thu, 19 May 2011 08:49:14 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [RFC] Memory API
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To: Avi Kivity <avi@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, qemu-devel <qemu-devel@nongnu.org>, Gleb Natapov <gleb@redhat.com>

On 05/19/2011 08:30 AM, Avi Kivity wrote:
> On 05/19/2011 04:26 PM, Jan Kiszka wrote:
>> On 2011-05-19 15:07, Avi Kivity wrote:

>> And when introducing hierarchical registration, we will have to go
>> through all of this once again. Plus the API may have to be changed
>> again if it does not fulfill all requirements of the hierarchical region
>> management. And we have no proof that it allows an efficient core
>> implementation.
>
> This API *is* hierarchical registration. v2 will (hopefully) prove that
> it can be done efficiently.

We also need hierarchical dispatch.  Priorities are just a weak attempt 
to emulate hierarchical dispatch but I don't think there's an 
improvement over a single dispatch table.

Hierarchical dispatch is simpler.  You just need a simple list at each bus.

I don't see a strong need to tie anything to qdev here FWIW.

Regards,

Anthony Liguori