Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934566AbeAHQMz (ORCPT + 1 other); Mon, 8 Jan 2018 11:12:55 -0500 Received: from wtarreau.pck.nerim.net ([62.212.114.60]:38892 "EHLO 1wt.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932943AbeAHQMx (ORCPT ); Mon, 8 Jan 2018 11:12:53 -0500 From: Willy Tarreau To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: tglx@linutronix.de, gnomes@lxorguk.ukuu.org.uk, torvalds@linux-foundation.org, Willy Tarreau Subject: [PATCH RFC 1/4] x86/thread_info: add TIF_NOPTI to disable PTI per task Date: Mon, 8 Jan 2018 17:12:16 +0100 Message-Id: <1515427939-10999-2-git-send-email-w@1wt.eu> X-Mailer: git-send-email 2.8.0.rc2.1.gbe9624a In-Reply-To: <1515427939-10999-1-git-send-email-w@1wt.eu> References: <1515427939-10999-1-git-send-email-w@1wt.eu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: This flag indicates that the task will not use isolated page tables. Signed-off-by: Willy Tarreau --- arch/x86/include/asm/thread_info.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index 0022333..2f92cf1 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -126,6 +126,14 @@ struct thread_info { #define _TIF_X32 (1 << TIF_X32) #define _TIF_FSCHECK (1 << TIF_FSCHECK) +/* The following flags only exist on x86-64. We can't use the shift anymore + * due to C using signed ints by default and asm using unsigned longs. + */ +#ifdef CONFIG_X86_64 +# define TIF_NOPTI 32 /* disable PTI for this task */ +# define _TIF_NOPTI 0x0000000100000000 +#endif + /* * work to do in syscall_trace_enter(). Also includes TIF_NOHZ for * enter_from_user_mode() -- 1.7.12.1