linux-kernel - Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time

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Message-ID: <20230612132750.GIZIcdVmvWkQXu/85B@fat_crate.local>
Date:   Mon, 12 Jun 2023 15:27:50 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     David Laight <David.Laight@...lab.com>
Cc:     Breno Leitao <leitao@...ian.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "pawan.kumar.gupta@...ux.intel.com" 
        <pawan.kumar.gupta@...ux.intel.com>,
        "paul@...l-moore.com" <paul@...l-moore.com>,
        "leit@...a.com" <leit@...a.com>, "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] cpu/bugs: Disable CPU mitigations at compilation time

On Mon, Jun 12, 2023 at 12:16:19PM +0000, David Laight wrote:
> I do (and I compile without page table separation),
> but some of the run-time patched versions are not as 'good'
> as compiling the code out.
> It might just be some nops, but maybe it is worse.

"might", schmight, ... other statements without proof...

If you want me to take you seriously, explain in detail the problem.
Otherwise, I can keep on ignoring you.

-- 
Regards/Gruss,
    Boris.

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