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=-3.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED,USER_AGENT_NEOMUTT autolearn=ham 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 B8B19C4360F for ; Fri, 5 Apr 2019 16:05:52 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8B942204EC for ; Fri, 5 Apr 2019 16:05:52 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="UBagRUk5" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8B942204EC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=wUloXYDIuWXw8kuhS/Ol02zpAVIYy4fm9B5aQl2GC6I=; b=UBagRUk5H2ISvj U/OcI6uIFEK6xph3dpGLPx5/1oZS2uEmwOyHTSaY6BKTzkG5D8m31c+Qj2zECXQrBuYtiIEehZZeh TZUqZxhjnZ2dpuypw5d9MlzC0qH8v1kQzZ6Ez5UOah4zTr+pzJyLDyF2jIpp2d8UAeTAphctoe8nH T2uzje+9fcIcTJVNDvxZkn8Jlaudcq63lViX/KztEooYGWxpJsd8W/wU3OqOsHQuQjp+AKUpysN6n FJuIDodtbTCaITND8vaZWWgTCqzHoNlcl5PJJGCRJbOkT5KfW8TT3sDYqnYd+4+SCdMYpEqJGqmpe 1mt3K5Rv13pBK9+Qu3Kw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hCRLf-0006wp-9i; Fri, 05 Apr 2019 16:05:47 +0000 Received: from mx1.redhat.com ([209.132.183.28]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hCRLc-0006wN-Bn for linux-arm-kernel@lists.infradead.org; Fri, 05 Apr 2019 16:05:45 +0000 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D639544FA7; Fri, 5 Apr 2019 16:05:43 +0000 (UTC) Received: from treble (ovpn-123-87.rdu2.redhat.com [10.10.123.87]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C756660C8D; Fri, 5 Apr 2019 16:05:38 +0000 (UTC) Date: Fri, 5 Apr 2019 11:05:36 -0500 From: Josh Poimboeuf To: Borislav Petkov Subject: Re: [PATCH RFC 2/5] x86/speculation: Add support for 'cpu_spec_mitigations=' cmdline options Message-ID: <20190405160536.sks2hmo6sxnxg3tl@treble> References: <78c63cb08f36f55407f534d49cc2543079e44dbb.1554396090.git.jpoimboe@redhat.com> <20190405135712.GF23348@zn.tnic> <20190405143101.ksj7ayjis4p52dgt@treble> <20190405152650.GH23348@zn.tnic> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190405152650.GH23348@zn.tnic> User-Agent: NeoMutt/20180716 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Fri, 05 Apr 2019 16:05:44 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190405_090544_424789_F944635C X-CRM114-Status: GOOD ( 17.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Zijlstra , Benjamin Herrenschmidt , Heiko Carstens , Paul Mackerras , "H . Peter Anvin" , Ingo Molnar , Andrea Arcangeli , linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, Will Deacon , Linus Torvalds , Catalin Marinas , Waiman Long , linux-arch@vger.kernel.org, Jon Masters , Jiri Kosina , Andy Lutomirski , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, Greg Kroah-Hartman , linux-kernel@vger.kernel.org, Tyler Hicks , Martin Schwidefsky , linuxppc-dev@lists.ozlabs.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Apr 05, 2019 at 05:26:50PM +0200, Borislav Petkov wrote: > On Fri, Apr 05, 2019 at 09:31:01AM -0500, Josh Poimboeuf wrote: > > My thinking was that the individual options could be used to override > > the global option. But maybe that's overkill? I dunno. > > You mean if the user deliberately types: > > "cpu_spec_mitigations=off spectre_v2=auto" > > on the cmdline to turn off all and then enable only one? > > Hmm, yap, sounds like an overkill to me. Then I'd probably do: > > pr_err("Make up your mind already!\n"); > return; > > :-)) > > I'd say let's do the simpler and cleaner thing now and think about > supporting this overkill when it really turns out that it is needed. Fair enough. > > I assume you mean just the part where L1TF_MITIGATION_DEFAULT is added? > > Yap. Ok. -- Josh _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel