linux-kernel - Re: [PATCH] x86/mm/mem_encrypt: Disable all instrumentation for SME early boot code

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Message-ID: <20190426162425.GI4608@zn.tnic>
Date:   Fri, 26 Apr 2019 18:24:25 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Gary R Hook <ghook@....com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Hook, Gary" <Gary.Hook@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "luto@...nel.org" <luto@...nel.org>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH] x86/mm/mem_encrypt: Disable all instrumentation for SME
 early boot code

On Fri, Apr 26, 2019 at 03:11:17PM +0000, Gary R Hook wrote:
> 2) Turn off instrumentation for lib/cmdline.c. The risk is that any
>     changes to its code would not enjoy the benefits of KASAN/etc testing
>     (if enabled).

What happened to Thomas' suggestion to turn off instrumentation for
those files only when CONFIG_AMD_MEM_ENCRYPT=y?

Which is a variant of 2) above with ifdeffery.

-- 
Regards/Gruss,
    Boris.

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