linux-kernel - Re: [PATCH RFC v2 1/6] x86: Skip PTI when disable indication is set

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Message-ID: <7057a6cc-f3ea-8826-5440-61e0154950da@linux.intel.com>
Date:   Thu, 15 Feb 2018 10:10:19 -0800
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Nadav Amit <namit@...are.com>, Ingo Molnar <mingo@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Willy Tarreau <w@....eu>, Nadav Amit <nadav.amit@...il.com>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC v2 1/6] x86: Skip PTI when disable indication is set

On 02/15/2018 08:35 AM, Nadav Amit wrote:
> +.Lno_spec_\@:
> +	lfence
> +	jmp	.Lend_\@
> +
>  .Lnoflush_\@:
>  	SET_NOFLUSH_BIT \save_reg
>  

How expensive is this?