Messages in this thread | | | Date | Tue, 03 Jun 2014 09:35:17 -0400 | From | Vlad Yasevich <> | Subject | Re: [PULL 2/2] vhost: replace rcu with mutex |
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On 06/03/2014 08:48 AM, Paolo Bonzini wrote: > Il 02/06/2014 23:58, Eric Dumazet ha scritto: >> This looks dubious >> >> What about using kfree_rcu() instead ? > > It would lead to unbound allocation from userspace. > >> translate_desc() still uses rcu_read_lock(), its not clear if the mutex >> is really held. > > Yes, vhost_get_vq_desc must be called with the vq mutex held. > > The rcu_read_lock/unlock in translate_desc is unnecessary. >
If that's true, then does dev->memory really needs to be rcu protected? It appears to always be read under mutex.
-vlad
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