Re: [Qemu-devel] [PATCH v3] util/async: use atomic_mb_set in qemu_bh_cancel

[Paolo Bonzini <pbonzini@redhat.com>]

On 08/11/2017 15:10, Sergio Lopez wrote:
>> I'm not quite sure that the pre-fetched is involved in this issue,
>> because pre-fetch reading a certain addresses should be invalidated by
>> write on another core to the same addresses. In our case write
>> req->state = THREAD_DONE should invalidate read req->state == THREAD_DONE.
>> I am inclined to think that there is a memory-reordering read with
>> write. It's a very real case for x86 and I don't see the reasons which
>> can prevent it:
>>
> Yes, you're right. This is actually a memory reordering issue. I'm
> going to rewrite that paragraph.

Well, memory reordering _is_ caused by speculative prefetching, delayed
cache invalidation (store buffers), and so on.

But it's probably better indeed to replace "pre-fetched" with
"outdated".  Whoever commits the patch can do the substitution (I can too).

Paolo