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Date: Tue, 23 Aug 2016 09:55:55 +0200
From: Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH 09/10] vhost, mm: make sure that oom_reaper doesn't reap
 memory read by vhost
Message-ID: <20160823075555.GE23577@dhcp22.suse.cz>
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>, Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>, David Rientjes <rientjes@google.com>, Vladimir Davydov <vdavydov@parallels.com>

On Tue 23-08-16 00:01:23, Michael S. Tsirkin wrote:
[...]
> Actually, vhost net calls out to tun which does regular copy_from_iter.
> Returning 0 there will cause corrupted packets in the network: not a
> huge deal, but ugly.  And I don't think we want to annotate run and
> macvtap as well.

Hmm, OK, I wasn't aware of that path and being consistent here matters.
If the vhost driver can interact with other subsystems then there is
really no other option than hooking into the page fault path. Ohh well.

-- 
Michal Hocko
SUSE Labs

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