linux-kernel - Re: [PATCH V2] IB/core: Add mitigation for Spectre V1

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Date:   Wed, 31 Jul 2019 14:52:59 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        "Luck, Tony" <tony.luck@...el.com>, Ira Weiny <ira.weiny@...el.com>
Cc:     Jason Gunthorpe <jgg@...pe.ca>, Leon Romanovsky <leon@...nel.org>,
        Parav Pandit <parav@...lanox.com>, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] IB/core: Add mitigation for Spectre V1

On Wed, 2019-07-31 at 12:52 -0500, Gustavo A. R. Silva wrote:
> This is insufficient. The speculation windows are large:
> 
> "Speculative  execution  on  modern  CPUs  can  run  several
> hundred  instructions  ahead." [1]
> 
> [1] https://spectreattack.com/spectre.pdf

Thanks, I'll take a look at that.  That issue aside, returning without
wasting time on two mutexes is still better IMO, so I like my patch more
than the proposed one.  Tony, would you like to resubmit?

-- 
Doug Ledford <dledford@...hat.com>
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