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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 07B3AC4345F for ; Fri, 19 Apr 2024 14:39:41 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=SuC/adN8; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4VLcjm4gQFz3dBr for ; Sat, 20 Apr 2024 00:39:40 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=SuC/adN8; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2604:1380:40e1:4800::1; helo=sin.source.kernel.org; envelope-from=will@kernel.org; receiver=lists.ozlabs.org) Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4VLchw6f1Kz2xQ7 for ; Sat, 20 Apr 2024 00:38:56 +1000 (AEST) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 48725CE1ACB; Fri, 19 Apr 2024 14:38:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9EAF7C072AA; Fri, 19 Apr 2024 14:38:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1713537533; bh=HaHW8LOM7CzKYKcJLEDAbtk0kNe6pNRRkCefhatJTL0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=SuC/adN8zf/JDG9shHoubRIOiGr8+e3T+cmz3cSQBxc1sRisROcD1PalPMEM1+H3W Vd6BevhpgR7mhl7DO2NMfRRSe6BXR/wVujj42nN/4G+fL+JONDvCzJMP3wP579Fpsw cgyJUtLLAQDxAvH3Ly3pt4v2Y2PgZvmwLa2RzXTuTudFsnoa2zaRHtz2XXKih66UlP AzYaOEH6gkaaF7QE2I6XX8jPYiaeKRMWv0vdVDNTa9H4OgS/1y5ZwOXm7ndFEtt+2V KCwi7ssV9O6ndE5yCOD0aFxRcFd2qz0vTgt5OnIE1YtwbPrH2KAMfKevsHFhvkTpH3 dHBYKIhHWK5ZA== Date: Fri, 19 Apr 2024 15:38:46 +0100 From: Will Deacon To: Sean Christopherson Subject: Re: [PATCH 1/3] x86/cpu: Actually turn off mitigations by default for SPECULATION_MITIGATIONS=n Message-ID: <20240419143846.GA3508@willie-the-truck> References: <20240409175108.1512861-1-seanjc@google.com> <20240409175108.1512861-2-seanjc@google.com> <20240413115324.53303a68@canb.auug.org.au> <87edb9d33r.fsf@mail.lhotse> <87bk6dd2l4.fsf@mail.lhotse> <20240419140321.GF3148@willie-the-truck> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, Stephen Rothwell , x86@kernel.org, Jonathan Corbet , Peter Zijlstra , Pawan Gupta , Dave Hansen , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Linux-Renesas , Heiko Carstens , Ingo Molnar , Geert Uytterhoeven , Catalin Marinas , Borislav Petkov , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Josh Poimboeuf , Daniel Sneddon Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Apr 19, 2024 at 07:06:00AM -0700, Sean Christopherson wrote: > On Fri, Apr 19, 2024, Will Deacon wrote: > > On Mon, Apr 15, 2024 at 07:31:23AM -0700, Sean Christopherson wrote: > > > On Mon, Apr 15, 2024, Geert Uytterhoeven wrote: > > > Oof. I completely missed that "cpu_mitigations" wasn't x86-only. I can't think > > > of better solution than an on-by-default generic Kconfig, though can't that it > > > more simply be: > > > > > > diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig > > > index 2b8fd6bb7da0..5930cb56ee29 100644 > > > --- a/drivers/base/Kconfig > > > +++ b/drivers/base/Kconfig > > > @@ -191,6 +191,9 @@ config GENERIC_CPU_AUTOPROBE > > > config GENERIC_CPU_VULNERABILITIES > > > bool > > > > > > +config SPECULATION_MITIGATIONS > > > + def_bool !X86 > > > + > > > config SOC_BUS > > > bool > > > select GLOB > > > > I can't see this in -next yet. Do you plan to post it as a proper patch > > to collect acks etc? > > Sorry, I neglected to Cc everyone. > > https://lore.kernel.org/all/20240417001507.2264512-2-seanjc@google.com Ah, thanks. I'll go Ack that... Will