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[209.132.180.67]) by mx.google.com with ESMTP id s13-v6si4265833plq.623.2018.01.26.14.00.21; Fri, 26 Jan 2018 14:00:37 -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; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=qXUFfzWM; 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 S1752101AbeAZV74 (ORCPT + 99 others); Fri, 26 Jan 2018 16:59:56 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:41888 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751546AbeAZV7z (ORCPT ); Fri, 26 Jan 2018 16:59:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=ct/qVFiYrZrrqdNBiFgGjGrHIURxLjZBwfmIYyDvNDA=; b=qXUFfzWMacRwQRWzROuOJOD9f +tjvfnsGdrXjMA0MLv3v0/zys/H73PqyKx1oO1RjImy3bLYqU6v1zTRIy8TNQUKEwaePRgNRZje1v DIuosNcJxYEOY9q1p4uouHfTk2MQugV1WVHFhKbjKr5fxBLk3ySRQtVgGwE12rXAeRUgvkzaolgTV NIWS2vHLKu/jG1+CmD6KtmlsoD07X6ebjVQvfTI0HsCHflPlV/m5ab/ecgAFDwFPqWePf5NTGPnai hUhWlYs+a8RYESHVZvBaXV/EzSnXqgYqudaZ4JYXNClOqweqQilJ+doYYijO/Xduv6hZTRJ+SiNAz 6nTlOP23A==; Received: from [2001:8b0:10b:1:2019:7b0b:f6a5:9cf] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1efC2C-00022Z-FL; Fri, 26 Jan 2018 21:59:46 +0000 Message-ID: <1517003984.30244.299.camel@infradead.org> Subject: Re: [PATCH] x86/cpufeatures: Cleanup AMD speculation feature bits From: David Woodhouse To: Borislav Petkov , Tom Lendacky Cc: x86-ml , linux-tip-commits@vger.kernel.org, hpa@zytor.com, gregkh@linuxfoundation.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, mingo@kernel.org In-Reply-To: <20180126215209.vqdxh5p672tcdst6@pd.tnic> References: <1516896855-7642-4-git-send-email-dwmw@amazon.co.uk> <20180126184139.rcfbtk7dvj7kmyfn@pd.tnic> <1516992318.30244.271.camel@infradead.org> <20180126184915.ioqewp56orj2qhrt@pd.tnic> <7094ed9b-40f7-ba2b-55a6-cc5ab0b06bb9@amd.com> <20180126215209.vqdxh5p672tcdst6@pd.tnic> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-d6yrapZIyd68zZ1fo7va" Date: Fri, 26 Jan 2018 21:59:44 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-d6yrapZIyd68zZ1fo7va Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-01-26 at 22:52 +0100, Borislav Petkov wrote: > On Fri, Jan 26, 2018 at 03:06:20PM -0600, Tom Lendacky wrote: > >=20 > > So I like the idea of AMD_IBRS/AMD_IBPB/AMD_STIBP and then use the magi= c > > quotes as appropriate.=C2=A0=C2=A0We could probably use the magic quote= s on > > AMD_STIBP and set X86_FEATURE_STIBP when we see X86_FEATURE_AMD_STIBP. > Like this? >=20 > We set the respective Intel features when we detect the AMD ones so that > we get correct /proc/cpuinfo strings. The respective AMD ones are not > shown. >=20 > + > + if (cpu_has(c, X86_FEATURE_AMD_IBRS)) > + set_cpu_cap(c, X86_FEATURE_IBRS); No, there is no X86_FEATURE_IBRS; that was going to be the "we are using IBRS" soft feature, analogous to X86_FEATURE_RETPOLINE and X86_FEATURE_IBPB, actually used for the alternatives. Intel doesn't *have* a feature bit for only IBRS. They have the bit which indicates that *both* the SPEC_CTRL (with IBRS) and PRED_CMD (with IBPB) registers are present. If we wanted to do this kind of thing, we'd do it the other way round. Turn the *Intel* feature into both 'IBRS' and 'IBPB' CPU-visible features, and have those defined in the AMD word. Then use virtual bits with "" for the software features, since we don't want *those* to appear in /proc/cpuinfo. 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