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Re: [qemu-s390x] [RFC v3 0/56] per-CPU locks

From: Paolo Bonzini
Subject: Re: [qemu-s390x] [RFC v3 0/56] per-CPU locks
Date: Fri, 19 Oct 2018 08:59:24 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0

On 19/10/2018 03:05, Emilio G. Cota wrote:
> I'm calling this series a v3 because it supersedes the two series
> I previously sent about using atomics for interrupt_request:
>   https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg02013.html
> The approach in that series cannot work reliably; using (locked) atomics
> to set interrupt_request but not using (locked) atomics to read it
> can lead to missed updates.

The idea here was that changes to protected fields are all followed by
kick.  That may not have been the case, granted, but I wonder if the
plan is unworkable.


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