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Re: [Qemu-devel] [PATCH v6 13/19] cputlb: atomically update tlb fields u

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH v6 13/19] cputlb: atomically update tlb fields used by tlb_reset_dirty
Date: Thu, 10 Nov 2016 18:27:42 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

On 11/10/2016 05:14 PM, Alex Bennée wrote:
Even worse than that we trip up the atomic.h QEMU_BUILD_BUG_ON with the
atomic_cmpxchg. Now I believe we can use atomic_cmpxchg__nocheck without
too much issue on x86 but we'll need to #ifdef it on detection of wide

You've already got CONFIG_ATOMIC64.  And what's the fallback?

We ought not be enabling mttcg for 32-bit host and 64-bit guest at all. But that doesn't help much here, where we're otherwise guest width agnostic.


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