From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A170FC43387 for ; Wed, 9 Jan 2019 13:36:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 68696206B6 for ; Wed, 9 Jan 2019 13:36:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731013AbfAINgA (ORCPT ); Wed, 9 Jan 2019 08:36:00 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:55955 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730050AbfAINgA (ORCPT ); Wed, 9 Jan 2019 08:36:00 -0500 Received: from keineahnung.molgen.mpg.de (keineahnung.molgen.mpg.de [141.14.17.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id D19A8201353427; Wed, 9 Jan 2019 14:35:57 +0100 (CET) Subject: Re: General protection fault in `switch_mm_irqs_off()` To: Thomas Gleixner Cc: Jiri Kosina , x86@kernel.org, LKML , Thomas Lendacky , Tim Chen , Borislav Petkov References: <784ab00e-ed72-c1bc-bc0c-31264deb7726@molgen.mpg.de> From: Paul Menzel Message-ID: <5c38f377-f088-5684-91a5-c2cc2d64dbbd@molgen.mpg.de> Date: Wed, 9 Jan 2019 14:35:57 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms090202040209030801050305" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a cryptographically signed message in MIME format. --------------ms090202040209030801050305 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Thomas, On 01/09/19 14:16, Thomas Gleixner wrote: > On Wed, 9 Jan 2019, Paul Menzel wrote: >> I get the same with microcode updates applied. >> >> $ dmesg | grep 'microcode: CPU0: patch_level' >> [ 3.809210] microcode: CPU0: patch_level=3D0x0600063e >> $ sudo modprobe msr >> $ sudo ./wrmsr 0x49 0x1 >> wrmsr: CPU 0 cannot set MSR 0x00000049 to 0x0000000000000001 >> >>> Could you please post /proc/cpuinfo from such a boot as well? >=20 > /proc/cpuinfo unfortunately does not contain the amd specific IBPB flag= , > but the dmesg of the original report says: >=20 > Spectre V2 : mitigation: Enabling conditional Indirect Branch Predict= ion Barrier >=20 > which means, that the CPUID bit is set. >=20 > Can you please provide the output of: >=20 > cpuid -1 -l 0x80000008 -r >=20 > On my AMD Opteron(TM) Processor 6276 with microcode 0x600063d loaded I = get: >=20 > 0x80000008 0x00: eax=3D0x00003030 ebx=3D0x00000000 ecx=3D0x0000500f = edx=3D0x00000000 >=20 > EBX is 0, which means that X86_FEATURE_AMD_IBPB is not enabled. So the > kernel does not try to use the speculation control MSR (0x49). With CPUID 20180519, I get the output below with both microcode update ve= rsions. 0x600063d: $ sudo ./cpuid -1 -l 0x80000008 -r CPU: 0x80000008 0x00: eax=3D0x00003030 ebx=3D0x00000000 ecx=3D0x0000500= f edx=3D0x00000000 0x600063e: $ sudo ./cpuid -1 -l 0x80000008 -r CPU: 0x80000008 0x00: eax=3D0x00003030 ebx=3D0x00000000 ecx=3D0x0000500= f edx=3D0x00000000 Kind regards, Paul --------------ms090202040209030801050305 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC EFowggUSMIID+qADAgECAgkA4wvV+K8l2YEwDQYJKoZIhvcNAQELBQAwgYIxCzAJBgNVBAYT AkRFMSswKQYDVQQKDCJULVN5c3RlbXMgRW50ZXJwcmlzZSBTZXJ2aWNlcyBHbWJIMR8wHQYD VQQLDBZULVN5c3RlbXMgVHJ1c3QgQ2VudGVyMSUwIwYDVQQDDBxULVRlbGVTZWMgR2xvYmFs Um9vdCBDbGFzcyAyMB4XDTE2MDIyMjEzMzgyMloXDTMxMDIyMjIzNTk1OVowgZUxCzAJBgNV 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