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Re: [Qemu-devel] [RFC v3 PATCH 14/14] target-i386: Generate fences for x

From: Peter Maydell
Subject: Re: [Qemu-devel] [RFC v3 PATCH 14/14] target-i386: Generate fences for x86
Date: Tue, 21 Jun 2016 18:54:39 +0100

On 21 June 2016 at 18:28, Pranith Kumar <address@hidden> wrote:
> Reg. the second point, I did consider this situation of running x86 on
> ARM where such barriers are necessary for correctness. But, I am
> really apprehensive of the cost it will impose. I am not sure if there
> are any alternative solutions to avoid generating barriers for each
> memory operation, but it would be great if we could reduce them.

I vaguely recall an idea that you could avoid needing
explicit barriers by turning all the guest load/stores into
host load-acquire/store-release, but I have no idea whether
that's (a) actually true (b) any better than piles of
explicit barriers.

-- PMM

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