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[209.132.180.67]) by mx.google.com with ESMTP id i5-v6si2629384plt.315.2018.01.25.14.01.18; Thu, 25 Jan 2018 14:01:33 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751496AbeAYWAw (ORCPT + 99 others); Thu, 25 Jan 2018 17:00:52 -0500 Received: from mail.skyhub.de ([5.9.137.197]:58458 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751196AbeAYWAs (ORCPT ); Thu, 25 Jan 2018 17:00:48 -0500 X-Virus-Scanned: Nedap ESD1 at mail.skyhub.de Received: from mail.skyhub.de ([127.0.0.1]) by localhost (blast.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id ooDuqpoCu7a9; Thu, 25 Jan 2018 23:00:47 +0100 (CET) Received: from pd.tnic (p200300EC2BD0EE0024194793E6CFFC7A.dip0.t-ipconnect.de [IPv6:2003:ec:2bd0:ee00:2419:4793:e6cf:fc7a]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 23E621EC03DB; Thu, 25 Jan 2018 23:00:47 +0100 (CET) Date: Thu, 25 Jan 2018 23:00:39 +0100 From: Borislav Petkov To: David Woodhouse Cc: arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, peterz@infradead.org, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org, dave.hansen@intel.com, gnomes@lxorguk.ukuu.org.uk, ashok.raj@intel.com, mingo@kernel.org Subject: Re: [PATCH v5 5/7] x86/pti: Do not enable PTI on processors which are not vulnerable to Meltdown Message-ID: <20180125220038.wnmng2sstav4fyzk@pd.tnic> References: <1516896855-7642-1-git-send-email-dwmw@amazon.co.uk> <1516896855-7642-6-git-send-email-dwmw@amazon.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1516896855-7642-6-git-send-email-dwmw@amazon.co.uk> User-Agent: NeoMutt/20170609 (1.8.3) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jan 25, 2018 at 04:14:13PM +0000, David Woodhouse wrote: > Also, for CPUs which don't speculate at all, don't report that they're > vulnerable to the Spectre variants either. > > Leave the cpu_no_meltdown[] match table with just X86_VENDOR_AMD in it > for now, even though that could be done with a simple comparison, on the > assumption that we'll have more to add. > > Based on suggestions from Dave Hansen and Alan Cox. > > Signed-off-by: David Woodhouse > Reviewed-by: Greg Kroah-Hartman > --- > arch/x86/kernel/cpu/common.c | 48 +++++++++++++++++++++++++++++++++++++++----- > 1 file changed, 43 insertions(+), 5 deletions(-) > > diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c > index e5d66e9..32650c7 100644 > --- a/arch/x86/kernel/cpu/common.c > +++ b/arch/x86/kernel/cpu/common.c > @@ -47,6 +47,8 @@ > #include > #include > #include > +#include > +#include > > #ifdef CONFIG_X86_LOCAL_APIC > #include > @@ -853,6 +855,41 @@ static void identify_cpu_without_cpuid(struct cpuinfo_x86 *c) > #endif > } > > +static const __initdata struct x86_cpu_id cpu_no_speculation[] = { > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CEDARVIEW, X86_FEATURE_ANY }, > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CLOVERVIEW, X86_FEATURE_ANY }, > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_LINCROFT, X86_FEATURE_ANY }, > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PENWELL, X86_FEATURE_ANY }, > + { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PINEVIEW, X86_FEATURE_ANY }, > + { X86_VENDOR_CENTAUR, 5 }, > + { X86_VENDOR_INTEL, 5 }, > + { X86_VENDOR_NSC, 5 }, > + { X86_VENDOR_ANY, 4 }, You probably wanna retab that one vertically too. Other than that, looks ok to me. Reviewed-by: Borislav Petkov -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.