From: Peter Maydell <peter.maydell@linaro.org>
To: Mark Burton <mark.burton@greensocs.com>
Cc: mttcg@listserver.greensocs.com,
"QEMU Developers" <qemu-devel@nongnu.org>,
"Alexander Graf" <agraf@suse.de>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Lluís Vilanova" <vilanova@ac.upc.edu>,
"KONRAD Frédéric" <fred.konrad@greensocs.com>
Subject: Re: [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_*.
Date: Wed, 17 Dec 2014 16:39:37 +0000 [thread overview]
Message-ID: <CAFEAcA_8U0zsiZ4e43tmi4mQDgMYmK21d3CouZpN8aNHmBR-pg@mail.gmail.com> (raw)
In-Reply-To: <6B541656-15EA-47CB-8043-AE3B18FC60D4@greensocs.com>
On 17 December 2014 at 16:29, Mark Burton <mark.burton@greensocs.com> wrote:
>> On 17 Dec 2014, at 17:27, Peter Maydell <peter.maydell@linaro.org> wrote:
>> I think a mutex is fine, personally -- I just don't want
>> to see fifteen hand-hacked mutexes in the target-* code.
>>
>
> Which would seem to favour the helper function approach?
> Or am I missing something?
You need at least some support from QEMU core -- consider
what happens with this patch if the ldrex takes a data
abort, for instance.
And if you need the "stop all other CPUs while I do this"
semantics linux-user currently uses then that definitely needs
core code support. (Maybe linux-user is being over-zealous
there; I haven't thought about it.)
-- PMM
next prev parent reply other threads:[~2014-12-17 16:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-16 9:13 [Qemu-devel] [RFC PATCH] target-arm: protect cpu_exclusive_* fred.konrad
2014-12-16 9:31 ` Paolo Bonzini
2014-12-16 9:36 ` Frederic Konrad
2014-12-16 9:49 ` Paolo Bonzini
2014-12-16 9:54 ` Frederic Konrad
2014-12-16 16:37 ` Peter Maydell
2014-12-17 10:27 ` Frederic Konrad
2014-12-17 10:28 ` Alexander Graf
2014-12-17 10:31 ` Mark Burton
2014-12-17 10:45 ` Alexander Graf
2014-12-17 11:12 ` Mark Burton
2014-12-17 11:18 ` Alexander Graf
2014-12-17 11:25 ` Paolo Bonzini
2014-12-17 11:36 ` Peter Maydell
2014-12-17 16:17 ` Mark Burton
2014-12-17 16:27 ` Peter Maydell
2014-12-17 16:29 ` Mark Burton
2014-12-17 16:39 ` Peter Maydell [this message]
2014-12-17 16:51 ` Peter Maydell
2014-12-18 9:12 ` Mark Burton
2014-12-18 12:24 ` Alexander Graf
2014-12-18 12:35 ` Dr. David Alan Gilbert
2014-12-18 13:28 ` Paolo Bonzini
2014-12-18 13:56 ` Mark Burton
2014-12-18 14:20 ` Mark Burton
2014-12-18 14:44 ` Alexander Graf
2014-12-18 14:51 ` Mark Burton
2014-12-18 15:05 ` Alexander Graf
2014-12-18 15:09 ` Mark Burton
2014-12-18 16:55 ` Paolo Bonzini
2014-12-17 15:52 ` Mark Burton
2014-12-17 16:20 ` Dr. David Alan Gilbert
2014-12-17 11:19 ` Peter Maydell
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