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[209.132.180.67]) by mx.google.com with ESMTP id r3-v6si17555952plo.377.2018.09.18.06.35.11; Tue, 18 Sep 2018 06:35:33 -0700 (PDT) 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=merlin.20170209 header.b=hcnnxS68; 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 S1729587AbeIRTFh (ORCPT + 99 others); Tue, 18 Sep 2018 15:05:37 -0400 Received: from merlin.infradead.org ([205.233.59.134]:53398 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728681AbeIRTFh (ORCPT ); Tue, 18 Sep 2018 15:05:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date: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=zoJi6qLsdHjqi3M7RGNA0W8CJ9Uj+3YJ493rvGxcif0=; b=hcnnxS68TAoL/Z2NBT3M7O5xo /lJpDqOZ6jV3VEwtz5AqVqyqTvVG5FxstY33S5qpCSpag8XniIzhXoUzuWbrUvQDfqYHj2qPy15cC VBo2yWlxW2/6BVD3IVMM3Um2gPzcPJ386Fxb4j/A+Cc3yTzbgol4bgL5Uzhq7jnOq7cAVi7A5a61K ijE2Sckh6y6YYwtHU8h5LZcOo4O5tZPOUqNlf8sXtQB1sJDpLj3oOiawMog8/NoVRbGComxXXCyWe kKUB/Q5Gr3bvjmnTxIYqdfFd5Tdd8EBSLnAJtE6xWg87z1JkCeAzOdRlTJA3Qs9/GfRdZneHU9j8X 761atb7pA==; Received: from [2001:8b0:10b:1:786a:113:d72e:bf66] (helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1g2G7b-0002yp-4g; Tue, 18 Sep 2018 13:32:55 +0000 Message-ID: Subject: Re: [PATCH] x86/speculation: Use AMD specific retpoline for inline asm on AMD From: David Woodhouse To: Peter Zijlstra , Zhenzhong Duan Cc: linux-kernel@vger.kernel.org, mingo@redhat.com, konrad.wilk@oracle.com, x86@kernel.org, tglx@linutronix.de, Srinivas REDDY Eeda , bp@suse.de, hpa@zytor.com, dhaval.giani@oracle.com Date: Tue, 18 Sep 2018 14:32:52 +0100 In-Reply-To: <20180918130316.GP24142@hirez.programming.kicks-ass.net> References: <87411705-893f-46d3-b899-b09ed9fa8d1b@default> <20180918095015.GE19234@hirez.programming.kicks-ass.net> <3fcc1453-1618-9a79-71c9-5eede0023775@oracle.com> <20180918105939.GK24106@hirez.programming.kicks-ass.net> <1c6ca05f-094e-03e9-b21a-866aaf80cebb@oracle.com> <20180918130058.GM24106@hirez.programming.kicks-ass.net> <20180918130316.GP24142@hirez.programming.kicks-ass.net> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-v6L24IfRQx5JsGoBZb0N" X-Mailer: Evolution 3.28.1-2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.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 --=-v6L24IfRQx5JsGoBZb0N Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-09-18 at 15:03 +0200, Peter Zijlstra wrote: > > > In original code, it will go to "call *%[thunk_target]\n" while > > > we have set SPECTRE_V2_RETPOLINE_MINIMAL or > > > SPECTRE_V2_RETPOLINE_MINIMAL_AMD. Is this expected? > >=20 > > Yes, that is exactly right -- it does that with or without your change > > though. >=20 > Soryr, I wrote that before I noticed the CONFIG_RETPOLINE vs RETPOLINE > thing. >=20 > In any case, since retpoline capable compilers are widely available, I'm > all for making CONFIG_RETPOLINE hard depend on it. That minimal stuff > really is quite silly. Yep, now the the compiler support is widespread that makes a lot of sense. --=-v6L24IfRQx5JsGoBZb0N 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 hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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