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Date: Sun, 29 Apr 2018 22:39:02 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [MODERATED] Re: [patch V7 13/15] SBB 13
Message-ID: <20180430023902.GA32734@char.us.oracle.com>
References: <20180429193045.711908246@linutronix.de>
 <20180429193938.557096663@linutronix.de>
 <20180430014856.GB29389@char.us.oracle.com>
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To: speck@linutronix.de
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On Sun, Apr 29, 2018 at 09:48:56PM -0400, speck for Konrad Rzeszutek Wilk wrote:
> On Sun, Apr 29, 2018 at 09:30:58PM +0200, speck for Thomas Gleixner wrote:
> > Subject: [patch V7 13/15] prctl: Add speculation control prctls
> > From: Thomas Gleixner <tglx@linutronix.de>
> > 
> > Add two new prctls to control aspects of speculation related vulnerabilites
> > and their mitigations.
> > 
> > PR_GET_SPECULATION_CTRL returns the state of the speculation misfeature
> > which is selected with arg2 of prctl(2). The return value uses bit 0-2 with
> > the following meaning:
> > 
> > PR_SPEC_PRCTL:	PRCTL per task control of the mitigation is enabled
> 
> This reads to me as "mitigation is engaged right now".
> 
> But in reality it means: "Hey, you can fiddle with the PR_SET_SPECULATION_CTRL if you
> would like"
> 
> Perhaps change this to say:
> 	"PRCTL per task control of the mitigation can be controlled by PR_SET_SPECULATION_CTRL"
> 
> but that is not true either (see the next patch, perhaps that is a bug?)

..it was a bug in my testing program. So that statement in quotes above is correct.