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Date: Thu, 20 Sep 2012 14:31:36 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [Qemu-devel] directory hierarchy
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To: Blue Swirl <blauwirbel@gmail.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

On 09/19/2012 10:57 PM, Blue Swirl wrote:
> On Wed, Sep 19, 2012 at 12:54 PM, Avi Kivity <avi@redhat.com> wrote:
>> On 09/14/2012 10:51 PM, Blue Swirl wrote:
>>>>
>>>> exec:
>>>
>>> These files need cleanup so that TCG code gets into tcg/. Maybe also
>>> TB and CPUTLB handling.
>>
>> Some of that could be done by adding a separate MemoryListener for tcg.
> 
> But the TBs and CPUTLB are based on virtual mappings, it would mean
> that MMU maps would have to be modeled using memory API. Is that fast
> enough?

No.  The memory API is designed to be fast on reads at the expense of
being slow on writes, and this will get worse as rcu is added.

I meant that the various calls to invalidate tcg-specific caches can use
a tcg-specific MemoryListener.

> This could have nice cleanup effects though and for example enable
> generic 'info vmtree' to discover VA->PA mappings for any target
> instead of current MMU table walkers.

How?  That's in a hardware defined format that's completely invisible to
the memory API.

-- 
error compiling committee.c: too many arguments to function