[MODERATED] Re: [patch V7 13/15] SBB 13

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

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.