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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,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 30CFCC43387 for ; Mon, 14 Jan 2019 17:09:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF7A720659 for ; Mon, 14 Jan 2019 17:09:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726953AbfANRJl (ORCPT ); Mon, 14 Jan 2019 12:09:41 -0500 Received: from mx3.molgen.mpg.de ([141.14.17.11]:56911 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726643AbfANRJj (ORCPT ); Mon, 14 Jan 2019 12:09:39 -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 48A1D201353427; Mon, 14 Jan 2019 18:09:36 +0100 (CET) Subject: Re: General protection fault in `switch_mm_irqs_off()` To: Thomas Lendacky , Borislav Petkov Cc: Thomas Gleixner , Jiri Kosina , "x86@kernel.org" , LKML , Tim Chen References: <5c38f377-f088-5684-91a5-c2cc2d64dbbd@molgen.mpg.de> <206f4322-c15e-6f0b-733d-fd19cd9c24a7@molgen.mpg.de> <98ed83c0-3077-848b-9de4-add70e9b417a@amd.com> <9bca3e26-1dfc-6e86-cf28-90cadd983ff4@molgen.mpg.de> <20190109211104.GG15665@zn.tnic> <9bbcbaa7-b164-fcef-0588-7c5f25aa2440@molgen.mpg.de> <20190110160054.GD17621@zn.tnic> <4de0b458-6028-3ab1-fef6-04c7fc440277@molgen.mpg.de> <3a35722f-969b-e720-1f3f-c60be7818ed1@amd.com> <8d6c854c-cbb9-adbf-345b-f04a40206573@amd.com> From: Paul Menzel Message-ID: Date: Mon, 14 Jan 2019 18:09:35 +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: <8d6c854c-cbb9-adbf-345b-f04a40206573@amd.com> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms050107040704030809010506" 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. --------------ms050107040704030809010506 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable Dear Thomas, Thank you for checking this, and coming back with the results so quickly.= On 01/14/19 18:00, Lendacky, Thomas wrote: > On 1/10/19 12:34 PM, Lendacky, Thomas wrote: >> On 1/10/19 10:49 AM, Paul Menzel wrote: >>> Dear Boris, dear Thomas, >>> >>> >>> On 01/10/19 17:00, Borislav Petkov wrote: >>>> On Thu, Jan 10, 2019 at 02:57:40PM +0100, Paul Menzel wrote: >>>>> Thank you very much. Indeed, the machine does not crash. I used Lin= us=E2=80=99 >>>>> master branch for testing, and applied your patch on top. Please fi= nd >>>>> the full log attached. >>>> >>>>> 80.649: [ 3.197107] Spectre V2 : spectre_v2_user_select_mitigati= on: set X86_FEATURE_USE_IBPB >>>> >>>> This is amazing. >>>> >>>> Ok, next diff, same exercise. Thx.>=20 >>>> --- >>>> diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include= /asm/nospec-branch.h >>>> index dad12b767ba0..528ef8336f5f 100644 >>>> --- a/arch/x86/include/asm/nospec-branch.h >>>> +++ b/arch/x86/include/asm/nospec-branch.h >>>> @@ -284,6 +284,12 @@ static inline void indirect_branch_prediction_b= arrier(void) >>>> { >>>> u64 val =3D PRED_CMD_IBPB; >>>> =20 >>>> + if (WARN_ON(boot_cpu_has(X86_FEATURE_USE_IBPB))) { >>>> + pr_info("%s: c: %px, array: 0x%x\n", >>>> + __func__, &boot_cpu_data, boot_cpu_data.x86_capability[7]); >>>> + return; >>>> + } >>>> + >>>> alternative_msr_write(MSR_IA32_PRED_CMD, val, X86_FEATURE_USE_IBPB= ); >>>> } >>>> =20 >>>> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c= >>>> index 8654b8b0c848..e818e5abe611 100644 >>>> --- a/arch/x86/kernel/cpu/bugs.c >>>> +++ b/arch/x86/kernel/cpu/bugs.c >>>> @@ -371,6 +371,9 @@ spectre_v2_user_select_mitigation(enum spectre_v= 2_mitigation_cmd v2_cmd) >>>> if (boot_cpu_has(X86_FEATURE_IBPB)) { >>>> setup_force_cpu_cap(X86_FEATURE_USE_IBPB); >>>> =20 >>>> + pr_err("%s: set X86_FEATURE_USE_IBPB, c: %px, array: 0x%x\n", >>>> + __func__, &boot_cpu_data, boot_cpu_data.x86_capability[7]); >>>> + >>>> switch (cmd) { >>>> case SPECTRE_V2_USER_CMD_FORCE: >>>> case SPECTRE_V2_USER_CMD_PRCTL_IBPB: >>>> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/comm= on.c >>>> index cb28e98a0659..8566737fa500 100644 >>>> --- a/arch/x86/kernel/cpu/common.c >>>> +++ b/arch/x86/kernel/cpu/common.c >>>> @@ -765,6 +765,9 @@ static void apply_forced_caps(struct cpuinfo_x86= *c) >>>> c->x86_capability[i] &=3D ~cpu_caps_cleared[i]; >>>> c->x86_capability[i] |=3D cpu_caps_set[i]; >>>> } >>>> + >>>> + if (c =3D=3D &boot_cpu_data) >>>> + pr_info("%s: c: %px, array: 0x%x\n", __func__, c, c->x86_capabili= ty[7]); >>>> } >>>> =20 >>>> static void init_speculation_control(struct cpuinfo_x86 *c) >>>> @@ -778,6 +781,10 @@ static void init_speculation_control(struct cpu= info_x86 *c) >>>> if (cpu_has(c, X86_FEATURE_SPEC_CTRL)) { >>>> set_cpu_cap(c, X86_FEATURE_IBRS); >>>> set_cpu_cap(c, X86_FEATURE_IBPB); >>>> + >>>> + pr_info("%s: X86_FEATURE_SPEC_CTRL: c: %px, array: 0x%x, CPUID: 0= x%x\n", >>>> + __func__, c, c->x86_capability[7], cpuid_edx(7)); >>>> + >>>> set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); >>>> } >>>> =20 >>>> @@ -793,9 +800,13 @@ static void init_speculation_control(struct cpu= info_x86 *c) >>>> set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); >>>> } >>>> =20 >>>> - if (cpu_has(c, X86_FEATURE_AMD_IBPB)) >>>> + if (cpu_has(c, X86_FEATURE_AMD_IBPB)) { >>>> set_cpu_cap(c, X86_FEATURE_IBPB); >>>> =20 >>>> + pr_info("%s: X86_FEATURE_AMD_IBPB: c: %px, array: 0x%x, CPUID: 0x= %x\n", >>>> + __func__, c, c->x86_capability[7], cpuid_ebx(0x80000008)); >>>> + } >>>> + >>>> if (cpu_has(c, X86_FEATURE_AMD_STIBP)) { >>>> set_cpu_cap(c, X86_FEATURE_STIBP); >>>> set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL); >>> >>> Please find the logs attached. >> >> Ah, so the CPUID value is showing X86_FEATURE_AMD_IBPB (not sure why t= he >> cpuid command was showing a value of zero for EBX in your previous ema= il). >> Let me see what I can find out about this processor/firmware relation.= I >> wouldn't expect to see the #GP given that the firmware says IBPB is >> supported. >=20 > I'm not able to reproduce this issue on my family 21, model 1, stepping= 2 > processor (AMD Opteron(TM) Processor 6274) as I am able to successfully= > write to the PRED_CMD MSR. It=E2=80=99s not exactly the same processor, but I guess the same family = should be good enough. What board do you have? Do you have two sockets, and both populated? Here is an Asus KGPE-D16 with two AMD Opterons put in. Lastly, my microcode updates are applied in firmware, and not by GNU/Linu= x. > Let's check the firmware file that you're loading. The one I'm using is= : >=20 > $ sha1sum /lib/firmware/amd-ucode/microcode_amd_fam15h.bin=20 > 90896256951d8edf7baf8181ae11e2dc618a5171 /lib/firmware/amd-ucode/micro= code_amd_fam15h.bin >=20 > Does that match what you have? Yes, that matches exactly. 90896256951d8edf7baf8181ae11e2dc618a5171 3rdparty/blobs/cpu/amd/fami= ly_15h/microcode_amd_fam15h.bin Kind regards, Paul --------------ms050107040704030809010506 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 BAYTAkRFMUUwQwYDVQQKEzxWZXJlaW4genVyIEZvZXJkZXJ1bmcgZWluZXMgRGV1dHNjaGVu IEZvcnNjaHVuZ3NuZXR6ZXMgZS4gVi4xEDAOBgNVBAsTB0RGTi1QS0kxLTArBgNVBAMTJERG Ti1WZXJlaW4gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkgMjCCASIwDQYJKoZIhvcNAQEBBQAD 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