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Re: [Qemu-devel] [PATCH for-2.4 0/8] memory: enable unlocked PIO/MMIO in

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH for-2.4 0/8] memory: enable unlocked PIO/MMIO in KVM
Date: Wed, 18 Mar 2015 15:52:30 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 18/03/2015 15:33, Jan Kiszka wrote:
> Just in time: I'm planning to rebase our queue soon, specifically to
> benefit from RCU support. Will let you know if it works on top of this
> series.

Great.  FWIW, this is the most similar version to the one we played with
in 2013.

I have an alternative one that keeps the single address_space_rw API,
and checks if you have the iothread mutex using thread-local storage.
The reason for that is that I would have to introduce
address_space_map/unmap_unlocked too, which I didn't really like.  Also,
in the not-so-long term we want the same code (e.g. SCSI layer) to run
in both locked and unlocked mode.

What do you think?


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