From: Avi Kivity <avi@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm-devel <kvm@vger.kernel.org>, Dor Laor <dlaor@redhat.com>,
Yaniv Kamay <yaniv@redhat.com>
Subject: Re: kvm: qemu: stop/start cpus before/after devices
Date: Thu, 26 Mar 2009 20:45:58 +0200 [thread overview]
Message-ID: <49CBCD66.7080805@redhat.com> (raw)
In-Reply-To: <20090326163640.GA9927@amt.cnet>
Marcelo Tosatti wrote:
> You're right, they can't. But its not bad to make it explicit, instead
> of relying on the locking behaviour?
>
You could say that we should depend on proper locking instead the order
of things shutting down and starting up :)
It's not just a cpu that can access a device; another device could dma
into it, so we need to quiesce the system first (including vcpus) and
then pause all devices.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
prev parent reply other threads:[~2009-03-26 18:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-24 17:16 kvm: qemu: stop/start cpus before/after devices Marcelo Tosatti
2009-03-25 11:45 ` Avi Kivity
2009-03-25 14:26 ` Marcelo Tosatti
2009-03-25 14:39 ` Marcelo Tosatti
2009-03-25 14:52 ` Avi Kivity
2009-03-26 10:03 ` Avi Kivity
2009-03-26 16:36 ` Marcelo Tosatti
2009-03-26 18:45 ` Avi Kivity [this message]
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