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[209.132.180.67]) by mx.google.com with ESMTP id y1-v6si1926990pli.11.2018.01.25.04.12.40; Thu, 25 Jan 2018 04:12:54 -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=r3MBPyp/; 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 S1751968AbeAYMMK (ORCPT + 99 others); Thu, 25 Jan 2018 07:12:10 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:36034 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751682AbeAYMMJ (ORCPT ); Thu, 25 Jan 2018 07:12:09 -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=w98gMl1wzrFj8AvJpinIGd+CR+lC6L27owdZ6l+TIUs=; b=r3MBPyp/mbFCtdG8o1oG961Qz qioUYzKHeW4QTtv2FNbpV3D8fl4vMXnGKZ/enW+l9bRcsSFciZ80blulYcFnY2EYiJodoFXZfxviA mFXBjNYv0s8pNDAfnBYFT7shqTzX874PqD0om7LPJL/IDvRmqp2I6AgRZ8n2FDa8ExESAKO4Ia6rw LVPQ8Fc6Fj2szXSqmd9OU4WRhSUpRw1Y5G5sT81x9lei4tbxp+9AJZb3BTgBMZ+jwKoBaqiEhSgze Yk+t62AVrUyAJgSkCxUjML5wa6/BVqY9r8Z0LmqMYU8xExlTUD11rvI6gqymWXAPQZGGFve7IOtRe s+668qTZg==; Received: from [2001:8b0:10b:1:88df:f864:4b91:a1c5] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eegNo-0008Se-4h; Thu, 25 Jan 2018 12:11:56 +0000 Message-ID: <1516882315.30244.88.camel@infradead.org> Subject: Re: [PATCH v4 7/7] x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support From: David Woodhouse To: Borislav Petkov 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 In-Reply-To: <20180125120348.ss62p5yaviemprxn@pd.tnic> References: <1516872189-16577-1-git-send-email-dwmw@amazon.co.uk> <1516872189-16577-8-git-send-email-dwmw@amazon.co.uk> <20180125114127.5iw4vy56bb2cs5mr@pd.tnic> <1516880855.30244.78.camel@infradead.org> <20180125115016.ov72ajqb6z7scdrc@pd.tnic> <1516881500.30244.83.camel@infradead.org> <20180125120348.ss62p5yaviemprxn@pd.tnic> Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAG1BMVEUHBwcUFBQpKSlGRkZhYWF9fX2Xl5eysrLMzMxFF+rXAAACaElEQVQ4y21UQXbbIBQE9wJALmAg6ToWON22FrhZthHgbvssUPathC7QWMful2JHSmtWwGg+zPxBCE0DU4QoJQgRgsg4w2gJjBNE8PjFBZgnQMBs+uZ1NQNQjZO3BV4AGDFC0f+l4DBG0VUAM4yv7SO8IgRdHXQ+A78HKL5OAeCfNQV5cHX8DsBUyIJKtYbt98BKaGNCKjfgFVkqYVLbkHKsRsbSCSa0T6npIqLrpRBgQKHUpQmgs9eEKaiUcooE8WWfCGVnBiUcn1uF2XhbfmN9apKnmMP2K4kizKkQWxuaVNOpU2cACIyxO1Po8ETHcXEDMVnozcejkAYA9iaD4pU0ZvNQ8VurNnTuFAYVtuIPUZW25PjDIjQAlGyffIiRQxoWAZBmJ0LTdW2Nyc0iP3DqRhxizvGJkBWZmyFVyZkddWzmBoIBVMpCCJ1CFzl98xav4VJKSSD45KbUT75ixikTphDSRh8+Uz7JLgUTAgAFwzqzjxc/nDY7WUApqY0OMdTwCKZSXplSKkgIRCHElCp8ZnhnKqXuwcNbk1L0VXE+I9alUXoHlLHl3mv7/dWQlJwtjREC7mu9L/U2jQyMUuO2EDS4q9Kl2ddm232bxIE5pjJuVwiljNn/Cfv25/T0cu5cZbwHGVq7h/zp0B4n3S99V/utD+Uo8BiGx9xCsOAV5z7/tjo4Z4z1Lvb90KZ7eFOoOeXOukqF2seo234YYuaQPpRP+cVZU5adT1Edun5Iz3z8fTz3+eSDh0Ip1c7zx1MaijGzTd/3MbRuBHz8cvcVgCMBRpOHvgu59WDhoat+nIZm+LWm9C/aaaGq5DCP9QAAAABJRU5ErkJggg== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-SiROhKKttaLEwk/loGxx" Date: Thu, 25 Jan 2018 12:11:55 +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 --=-SiROhKKttaLEwk/loGxx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 13:03 +0100, Borislav Petkov wrote: > On Thu, Jan 25, 2018 at 11:58:20AM +0000, David Woodhouse wrote: > > They're immediates, not registers. So it's like the first example > in... >=20 > Oh, I know very well what they are - I simply find the macro more > readable if there are less or no arguments. Oh, I agree, but having to write 0x49 there instead of MSR_IA32_PRED_CMD was a more pressing reason *not* to change it. There are possibly macro hacks that can make that work (the first na=C3=AFv= e attempt didn't) but it exceeded my boredom threshold fairly rapidly. If you send me a version which still uses MSR_IA32_PRED_CMD and PRED_CMD_IBPB instead of hard-coding the numbers, and which doesn't end up with piles of __stringify() and similar crap to do so, I'll happily change it. --=-SiROhKKttaLEwk/loGxx Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM 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