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Re: [Qemu-devel] Should we introduce a TranslationRegion with its own co

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Should we introduce a TranslationRegion with its own codegen buffer?
Date: Mon, 4 Apr 2016 11:01:46 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 04/04/2016 10:54, Alex Bennée wrote:
> Thoughts, objections? Discuss ;-)

I think we're putting a lot of carts before the horse.

We have like half a dozen subprojects and none are moving because
there's no clear idea of what to do next and why.  The first thing to do
is to focus on fixing and speeding up user-mode MTTCG (Sergey's work on
upstreaming the patches from Fred and me) and on upstreaming Alvise's
work on ll/sc and TLB flushes.

The second thing to do is to make tb_flush thread safe; here there are
three competing mechanisms (Fred's run_safe_on_cpu, Emilio's mass
invalidation and my idea of using RCU) that we can discuss.  Your idea
here is a fourth one.  It's not a bad one, not at all.  But even if it
has other positive side effects (e.g. easier jump patching), it's a
large project to embark on when there are at least three other
possibilities---two of them with code and the third (mine) being a
subset of yours.


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