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Re: [Qemu-devel] [RFC 02/30] tcg: add tcg_cmpxchg_lock

From: Richard Henderson
Subject: Re: [Qemu-devel] [RFC 02/30] tcg: add tcg_cmpxchg_lock
Date: Mon, 27 Jun 2016 14:02:24 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1

On 06/27/2016 01:41 PM, Emilio G. Cota wrote:
Supporting 64-bit hosts on 32-bit guests has the problem of non-atomicity
of 64-bit accesses, however.

It does. It would be possible to do something with armv7 and i686 hosts, as 64-bit atomic ops exist, but it's probably not worth the effort.

As you might be able to glean from the multiple sparc64-on-i686 threads, I'm becoming annoyed with i686. I wouldn't be disappointed to completely deprecate it.


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