From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66E77C38A2A for ; Sat, 9 May 2020 00:39:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 334A0218AC for ; Sat, 9 May 2020 00:39:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588984754; bh=lxWn3FHGQGcJm4LWAcdUb4NKG7yY8eIfeb3fsbkUvBU=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=L7iyiiB6/wpP8S6vbkPv7fByKmytFt/HxR0ZgBsElgnZvhaICYcdIJm0V18XHvXKd 3q1Ha1orrIO6mVUIYbD8K+EBkF6Dv3pQ0sy1q1jIV04eLMldDcxxoX99QXNx2KARL8 z1gGikxhSvRy3a0rpyU3KpHK3YrV6tIEfcr8M1vA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728532AbgEIAjN (ORCPT ); Fri, 8 May 2020 20:39:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:52624 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727984AbgEIAjN (ORCPT ); Fri, 8 May 2020 20:39:13 -0400 Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4562024956 for ; Sat, 9 May 2020 00:39:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588984752; bh=lxWn3FHGQGcJm4LWAcdUb4NKG7yY8eIfeb3fsbkUvBU=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=mqmH9p0+kmT/7Ix3yaDgfmi9THxpI8yayvNF0LbPiT0MEYsHEe9+HmJr2HS3lCTTQ LeJTtVQwxYPZZByYVAXBY9xaAw4KQhjwZkEFeGP/zXo4EoRRs8RXObITaRwvkRYFvr X4gPJ/fdjOlFwvt9TsDDm4bl2XK9gvy6P8A0ayls= Received: by mail-wm1-f50.google.com with SMTP id g12so12582315wmh.3 for ; Fri, 08 May 2020 17:39:12 -0700 (PDT) X-Gm-Message-State: AGi0PuaxYvZfnFWTrMs/ivErXF8isxxysRS5evcxxv5CDg54uV3osrB7 xNrEajuCiox3ER/z+pywWWekk87o77bCwmvim/8l4Q== X-Google-Smtp-Source: APiQypJctJGbkHPQllk3eiT1/t67YE09f7WUr1xjjnb8tt8cLxtwplao1oMqmduaFArFbLO/BCTJpCx2lp7Eg9QH6Fs= X-Received: by 2002:a7b:c5d3:: with SMTP id n19mr11653491wmk.21.1588984750777; Fri, 08 May 2020 17:39:10 -0700 (PDT) MIME-Version: 1.0 References: <20200505134354.774943181@linutronix.de> <20200505134903.346741553@linutronix.de> In-Reply-To: <20200505134903.346741553@linutronix.de> From: Andy Lutomirski Date: Fri, 8 May 2020 17:39:00 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch V4 part 3 01/29] x86/traps: Mark fixup_bad_iret() noinstr To: Thomas Gleixner Cc: LKML , X86 ML , "Paul E. McKenney" , Andy Lutomirski , Alexandre Chartre , Frederic Weisbecker , Paolo Bonzini , Sean Christopherson , Masami Hiramatsu , Petr Mladek , Steven Rostedt , Joel Fernandes , Boris Ostrovsky , Juergen Gross , Brian Gerst , Mathieu Desnoyers , Josh Poimboeuf , Will Deacon Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 5, 2020 at 7:15 AM Thomas Gleixner wrote: > > This is called from deep entry ASM in a situation where instrumentation > will cause more harm than providing useful information. > Acked-by: Andy Lutomirski Maybe add to changelog: Switch from memmove() to memcpy() because memmove() can't be called from noinstr code.