Glauber Costa wrote:
>
>>> [EMAIL PROTECTED] linux-2.6 (master)]$ git grep  down_read.*slots_lock 
>>> arch/x86/kvm/ | wc -l
>>> 16
>>
>> We take the lock for read 16 times, could be narrowed down to 
>> probably once (with a drop and re-take around guest mode).
>
> Since it will be written to so rarely, that's probably fine.
>
>

Moreover, the time setting up guest entry and handling exits is bounded 
and usually short.

[We need to drop the lock when emulating hlt, too, for this to hold]

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.


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