Re: [Qemu-devel] [PATCH 30/30] exec: put address space dispatch under RCU critical section

[Paolo Bonzini]

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Il 28/06/2013 21:38, Jan Kiszka ha scritto:
> At this point, do we still have unowned memory regions?

Yes, for stuff that is registered by the boards or by non-qdevified
devices.  In either case, they cannot disappear so it's fine that you
call address_space_translate outside the BQL---even if they lack an owner.

Paolo

> If so, we must not return them here if the caller is not holding 
> the BQL (which is supposed to protect their 
> registration/modification/deregistration).
> 
> I played with a version today that returns NULL in this case. Then 
> the caller of address_space_translate can take the BQL and retry 
> the translation.
> 
> Jan
> 
> 

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