linux-kernel - Re: [PATCH] x86/doc: add PTI description

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Message-ID: <alpine.DEB.2.20.1801042245230.2127@nanos>
Date:   Thu, 4 Jan 2018 22:46:44 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        moritz.lipp@...k.tugraz.at, daniel.gruss@...k.tugraz.at,
        michael.schwarz@...k.tugraz.at, richard.fellner@...dent.tugraz.at,
        luto@...nel.org, torvalds@...ux-foundation.org,
        keescook@...gle.com, hughd@...gle.com
Subject: Re: [PATCH] x86/doc: add PTI description

On Thu, 4 Jan 2018, Dave Hansen wrote:
>  
> -	pti=		[X86_64]
> +	pti=		[X86_64] Disable Page Table Isolation of user and

That description is definitely wrong....

> +			kernel address spaces.  Disabling this feature
> +			removes hardening, but improves performance of
> +			system calls and interrupts.
> +
>  			Control user/kernel address space isolation:
>  			on - enable
>  			off - disable
>  			auto - default setting
>  
> +	nopti		[X86_64]
> +			Equivalent to pti=off
> +
>  	pty.legacy_count=
>  			[KNL] Number of legacy pty's. Overwrites compiled-in
>  			default number.

Thanks,

	tglx