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[209.132.180.67]) by mx.google.com with ESMTP id g19si11070383ejw.373.2019.10.02.09.17.32; Wed, 02 Oct 2019 09:17:57 -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; 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 S1729075AbfJBPwl (ORCPT + 99 others); Wed, 2 Oct 2019 11:52:41 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:46771 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728735AbfJBPwl (ORCPT ); Wed, 2 Oct 2019 11:52:41 -0400 Received: from rabammel.molgen.mpg.de (rabammel.molgen.mpg.de [141.14.30.220]) (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 E4C0320225687; Wed, 2 Oct 2019 17:52:36 +0200 (CEST) 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 , Kinky Nekoboi , =?UTF-8?Q?Merlin_B=c3=bcge?= , Timothy Pearson , Vikings GmbH , =?UTF-8?Q?Piotr_Kr=c3=b3l?= , coreboot@coreboot.org 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: Wed, 2 Oct 2019 17:52:36 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms020205030404010808060207" 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. --------------ms020205030404010808060207 Content-Type: multipart/mixed; boundary="------------211F7E6583D72F676B406007" Content-Language: en-US This is a multi-part message in MIME format. --------------211F7E6583D72F676B406007 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable [CC: +affected coreboot folks, +coreboot mailing list] Dear Thomas, More affected people discussed this issue on the coreboot mailing list [1= ]. On 2019-01-14 18:37, Lendacky, Thomas wrote: > On 1/14/19 11:09 AM, Paul Menzel wrote: >> 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 L= inus=E2=80=99 >>>>>>> master branch for testing, and applied your patch on top. Please = find >>>>>>> the full log attached. >>>>>> >>>>>>> 80.649: [ 3.197107] Spectre V2 : spectre_v2_user_select_mitiga= tion: 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/inclu= de/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= _barrier(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_IB= PB); >>>>>> } >>>>>> =20 >>>>>> diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs= =2Ec >>>>>> 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= _v2_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/co= mmon.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_x= 86 *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_capabi= lity[7]); >>>>>> } >>>>>> =20 >>>>>> static void init_speculation_control(struct cpuinfo_x86 *c) >>>>>> @@ -778,6 +781,10 @@ static void init_speculation_control(struct c= puinfo_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:= 0x%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 c= puinfo_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= the >>>> cpuid command was showing a value of zero for EBX in your previous e= mail). >>>> Let me see what I can find out about this processor/firmware relatio= n. I >>>> wouldn't expect to see the #GP given that the firmware says IBPB is >>>> supported. >>> >>> I'm not able to reproduce this issue on my family 21, model 1, steppi= ng 2 >>> processor (AMD Opteron(TM) Processor 6274) as I am able to successful= ly >>> write to the PRED_CMD MSR. >> >> It=E2=80=99s not exactly the same processor, but I guess the same fami= ly should be >> good enough. What board do you have? Do you have two sockets, and both= >> populated? >=20 > Yes, It is a two-socket system with two processors installed. >=20 >> Here is an Asus KGPE-D16 with two AMD Opterons put in. >> >> Lastly, my microcode updates are applied in firmware, and not by GNU/L= inux. >=20 > Ok, I was confused on how you had reported that, sorry. Kinky reports, that populating the memory slots of both NUMA nodes fixes = this. Kinky, what slots do you have exactly populated? I haven=E2=80=99t been able to verify that yet, but please find my output= of `sudo dmidecode -t memory` with a 8 * 16 GB system attached, which is affected. > Can we try an experiment where you use the older version of the Asus > firmware but build an initramfs that will perform early microcode loadi= ng? > I'm curious if things will work when loaded via Linux. I believe the users reported that this works. >>> Let's check the firmware file that you're loading. The one I'm using = is: >>> >>> $ sha1sum /lib/firmware/amd-ucode/microcode_amd_fam15h.bin=20 >>> 90896256951d8edf7baf8181ae11e2dc618a5171 /lib/firmware/amd-ucode/mic= rocode_amd_fam15h.bin >>> >>> Does that match what you have? >> >> Yes, that matches exactly. >> >> 90896256951d8edf7baf8181ae11e2dc618a5171 3rdparty/blobs/cpu/amd/f= amily_15h/microcode_amd_fam15h.bin Kind regards, Paul [1]: https://mail.coreboot.org/hyperkitty/list/coreboot@coreboot.org/thre= ad/QZIVOD4UADLLPZEE7MFUUTQQM343GKOC/ --------------211F7E6583D72F676B406007 Content-Type: text/plain; charset=UTF-8; name="asus-kgpe-d16-128-gb-dmidecode-t-memory.txt" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="asus-kgpe-d16-128-gb-dmidecode-t-memory.txt" IyBkbWlkZWNvZGUgMy4wCkdldHRpbmcgU01CSU9TIGRhdGEgZnJvbSBzeXNmcy4KU01CSU9T IDIuNyBwcmVzZW50LgoKSGFuZGxlIDB4MDAwNiwgRE1JIHR5cGUgMTYsIDIzIGJ5dGVzClBo eXNpY2FsIE1lbW9yeSBBcnJheQoJTG9jYXRpb246IFN5c3RlbSBCb2FyZCBPciBNb3RoZXJi 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