linux-kernel - Re: [PATCH 00/10] Add dynamic boost control support

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Message-ID: <ZEkrZ83fFwiweCTz@localhost>
Date:   Wed, 26 Apr 2023 15:47:19 +0200
From:   Pavel Machek <pavel@....cz>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        linux-crypto@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        "David S . Miller" <davem@...emloft.net>,
        John Allen <john.allen@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 00/10] Add dynamic boost control support

Hi!

> Dynamic boost control is a feature of some SoCs that allows
> an authenticated entity to send commands to the security processor
> to control certain SOC characteristics with the intention to improve
> performance.
> 
> This is implemented via a mechanism that a userspace application would
> authenticate using a nonce and key exchange over an IOCTL interface.
> 
> After authentication is complete an application can exchange signed
> messages with the security processor and both ends can validate the
> data transmitted.

Why is this acceptable? This precludes cross-platform interfaces,
right? Why would application want to validate data from PSP? That
precludes virtualization, right?

Just put the key in kernel. Users have right to control their own
hardware.
							Pavel

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