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[209.132.180.67]) by mx.google.com with ESMTP id 64si10599734pgc.62.2018.01.21.10.55.12; Sun, 21 Jan 2018 10:55:26 -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=VHtTznKw; 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 S1751282AbeAUSyu (ORCPT + 99 others); Sun, 21 Jan 2018 13:54:50 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:40844 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750853AbeAUSyt (ORCPT ); Sun, 21 Jan 2018 13:54:49 -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=aSvOydQ1qIip7zqa9WXNlOXMNbFRMTaTr1JD7FViIT4=; b=VHtTznKwnoQmaHvG2ke5artCF Vhe0m8yt3wae+cNNz28b4dqTZdaGT19y9nRj9mTFtwkFPi08+bk6tnJz8ZTc7Ebd4o12u8R3K/A/g ME9i1yzTnSUiRO8m5R6AXWTTvLaTnKJuUSUxQlvdud5fO363rTGwTqA+35ZHrfiV84akeJp9h8v7l 5Cmnfc7WG+sHIeD8w7cewiOzTd6PqnsH8SByNpHkNYufV19d7yKb8Vfzt8S0EzDsOoPrx+gGaidnp jhxpj/VRtciBDQoW7fjAX92luOFjE8SO82Qy7RHPrzEdi6ahwrfVb6/w+ivrRObxu5y5YQnCX+wz7 xbYAoYGzw==; Received: from [2001:8b0:10b:1:bc54:a5a:35be:eeef] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1edKl7-000770-TZ; Sun, 21 Jan 2018 18:54:30 +0000 Message-ID: <1516560862.9814.47.camel@infradead.org> Subject: Re: [PATCH v2 5/8] x86/speculation: Add basic support for IBPB 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 In-Reply-To: <20180121180621.ufmc5m7nr6v4tjvc@pd.tnic> References: <1516528149-9370-1-git-send-email-dwmw@amazon.co.uk> <1516528149-9370-6-git-send-email-dwmw@amazon.co.uk> <20180121180621.ufmc5m7nr6v4tjvc@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="=-V5v+feRBMbOcQ7Qdxrsa" Date: Sun, 21 Jan 2018 18:54:22 +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 --=-V5v+feRBMbOcQ7Qdxrsa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2018-01-21 at 19:06 +0100, Borislav Petkov wrote: >=20 > > switch to using ALTERNATIVES instead of static_cpu_has] >=20 > Why? >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (static_cpu_has(X86_FE= ATURE_IBPB)) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0wrmsr(MSR_IA32_PRED_CMD, PRED_CMD_IBPB, 0); >=20 > It can't get any more readable than this. Why even f*ck with > alternatives? Because we're backporting this to every stable kernel under the sun, and they don't already require asm-goto. Peter does have a dozen or so objtool patches to protect us against the missed GCC optimisation which would make it vulnerable via a conditional branch, but we'll do that *after* the basic backportable implementation using ALTERNATIVE goes in. --=-V5v+feRBMbOcQ7Qdxrsa 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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