linux-kernel - Re: [PATCH 4/4] x86/speculation: Add PSF mitigation kernel parameters

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Message-ID: <20210421184826.GA3120@zn.tnic>
Date:   Wed, 21 Apr 2021 20:48:26 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Bandan Das <bsd@...hat.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Ramakrishna Saripalli <rsaripal@....com>,
        linux-kernel@...r.kernel.org, x86@...nel.org, tglx@...utronix.de,
        mingo@...hat.com, Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH 4/4] x86/speculation: Add PSF mitigation kernel parameters

On Wed, Apr 21, 2021 at 02:32:13PM -0400, Bandan Das wrote:
> Maybe, rename the parameter to something like psfd_disable, then off
> -> disables mitigation and on -> enables it. Or just rewriting this to
> off -> turns off predictive store forwarding is probably ok too.

Yes:

	off - Turns off predictive store forwarding.
	on  - Turns on...

Ramakrishna, you don't have to call this a mitigation - this is a flag
which controls the feature.

Also, those 4 patches can be merged into a single one which simply adds
the feature along with the boot-time controls.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette