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=-28.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL 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 99B1AC433B4 for ; Thu, 6 May 2021 07:10:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7976761168 for ; Thu, 6 May 2021 07:10:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233167AbhEFHLo (ORCPT ); Thu, 6 May 2021 03:11:44 -0400 Received: from linux.microsoft.com ([13.77.154.182]:59678 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232793AbhEFHLm (ORCPT ); Thu, 6 May 2021 03:11:42 -0400 Received: from minint-m3g9p8n.europe.corp.microsoft.com (unknown [49.207.195.141]) by linux.microsoft.com (Postfix) with ESMTPSA id 70F7A20B7178; Thu, 6 May 2021 00:10:43 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 70F7A20B7178 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1620285045; bh=PD9SiN6yE0HEGCtL5cXmJaYf2RP4vpF1uy5fBLBdzpQ=; h=Subject:From:In-Reply-To:Date:Cc:References:To:From; b=P/CENEbftU+S9u4KQoeNhSwmblH6LnQ47l+CEGwFRiFIJoeUi00ByIDK7mOj667/x 7fY0Nak/JJgyR+D/2BWGcg4/VnUp73jsUyRAECtiI/XzM86k35Ng20nltCCdCCvI4P iPKG2hsN5b1jKef7ae4y76R1XyjbCQCViIR+h6mE= Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.60.0.2.21\)) Subject: Re: [PATCH v2 1/2] optee: fix tee out of memory failure seen during kexec reboot From: Allen Pais In-Reply-To: Date: Thu, 6 May 2021 12:40:40 +0530 Cc: Allen Pais , zajec5@gmail.com, bcm-kernel-feedback-list@broadcom.com, Linux ARM , Linux Kernel Mailing List , OP-TEE TrustedFirmware Content-Transfer-Encoding: quoted-printable Message-Id: <51FC863B-96C5-47BA-8EBF-3D9FB6DE7DD2@linux.microsoft.com> References: <20210225090610.242623-1-allen.lkml@gmail.com> <20210225090610.242623-2-allen.lkml@gmail.com> <9a6c017c-d156-f939-f907-d6dfe83c41ac@linux.microsoft.com> <409F60D9-F0FB-4B69-B64B-CC6B3704038E@linux.microsoft.com> To: Jens Wiklander X-Mailer: Apple Mail (2.3654.60.0.2.21) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>>>>> [ 0.368428] tee_bnxt_fw optee-clnt0: tee_shm_alloc failed >>>>>> [ 0.368461] tee_bnxt_fw: probe of optee-clnt0 failed with = error -22 >>>>>>=20 >>>>>> tee_shm_release() is not invoked on dma shm buffer. >>>>>>=20 >>>>>> Implement .shutdown() method to handle the release of the buffers >>>>>> correctly. >>>>>>=20 >>>>>> More info: >>>>>> https://github.com/OP-TEE/optee_os/issues/3637 >>>>>>=20 >>>>>> Signed-off-by: Allen Pais >>>>>> --- >>>>>> drivers/tee/optee/core.c | 20 ++++++++++++++++++++ >>>>>> 1 file changed, 20 insertions(+) >>>>>=20 >>>>> This looks good to me. Do you have a practical way of testing this = on >>>>> QEMU for instance? >>>>>=20 >>>>=20 >>>> Jens, >>>>=20 >>>> I could not reproduce nor create a setup using QEMU, I could only >>>> do it on a real h/w. >>>>=20 >>>> I have extensively tested the fix and I don't see any issues. >>>=20 >>> I did a few test runs too, seems OK. >>=20 >> I carried these changes and have not run into any issues with Kexec = so far. >> Last week, while trying out kdump, we ran into a crash(this is when = the >> Kdump kernel reboots). >>=20 >> $echo c > /proc/sysrq-trigger >>=20 >> Leads to: >>=20 >> [ 18.004831] Unable to handle kernel paging request at virtual = address ffff0008dcef6758 >> [ 18.013002] Mem abort info: >> [ 18.015885] ESR =3D 0x96000005 >> [ 18.019034] EC =3D 0x25: DABT (current EL), IL =3D 32 bits >> [ 18.024516] SET =3D 0, FnV =3D 0 >> [ 18.027667] EA =3D 0, S1PTW =3D 0 >> [ 18.030905] Data abort info: >> [ 18.033877] ISV =3D 0, ISS =3D 0x00000005 >> [ 18.037835] CM =3D 0, WnR =3D 0 >> [ 18.040896] swapper pgtable: 4k pages, 48-bit VAs, = pgdp=3D0000000970a78000 >> [ 18.047811] [ffff0008dcef6758] pgd=3D000000097fbf9003, = pud=3D0000000000000000 >> [ 18.054819] Internal error: Oops: 96000005 [#1] SMP >> [ 18.059850] Modules linked in: bnxt_en pcie_iproc_platform = pcie_iproc diagbe(O) >> [ 18.067395] CPU: 3 PID: 1 Comm: systemd-shutdow Tainted: G = O 5.4.83-microsoft-standard #1 >> [ 18.077174] Hardware name: Overlake (DT) >> [ 18.081219] pstate: 80400005 (Nzcv daif +PAN -UAO) >> [ 18.086170] pc : tee_shm_free+0x18/0x48 >> [ 18.090126] lr : optee_disable_shm_cache+0xa4/0xf0 >> [ 18.095066] sp : ffff80001005bb90 >> [ 18.098484] x29: ffff80001005bb90 x28: ffff000037e20000 >> [ 18.103962] x27: 0000000000000000 x26: ffff00003ed10490 >> [ 18.109440] x25: ffffca760e975f90 x24: 0000000000000000 >> [ 18.114918] x23: ffffca760ed79808 x22: ffff00003ec66e18 >> [ 18.120396] x21: ffff80001005bc08 x20: 00000000b200000a >> [ 18.125874] x19: ffff0008dcef6700 x18: 0000000000000010 >> [ 18.131352] x17: 0000000000000000 x16: 0000000000000000 >> [ 18.136829] x15: ffffffffffffffff x14: ffffca760ed79808 >> [ 18.142307] x13: ffff80009005b897 x12: ffff80001005b89f >> [ 18.147786] x11: ffffca760eda4000 x10: ffff80001005b820 >> [ 18.153264] x9 : 00000000ffffffd0 x8 : ffffca760e59b2c0 >> [ 18.158742] x7 : 0000000000000000 x6 : 0000000000000000 >> [ 18.164220] x5 : 0000000000000000 x4 : 0000000000000000 >> [ 18.169698] x3 : 0000000000000000 x2 : ffff0008dcef6700 >> [ 18.175175] x1 : 00000000ffff0008 x0 : ffffca760e59ca04 >> [ 18.180654] Call trace: >> [ 18.183176] tee_shm_free+0x18/0x48 >> [ 18.186773] optee_disable_shm_cache+0xa4/0xf0 >> [ 18.191356] optee_shutdown+0x20/0x30 >> [ 18.195135] platform_drv_shutdown+0x2c/0x38 >> [ 18.199538] device_shutdown+0x180/0x298 >> [ 18.203586] kernel_restart_prepare+0x44/0x50 >> [ 18.208078] kernel_restart+0x20/0x68 >> [ 18.211853] __do_sys_reboot+0x104/0x258 >> [ 18.215899] __arm64_sys_reboot+0x2c/0x38 >> [ 18.220035] el0_svc_handler+0x90/0x138 >> [ 18.223991] el0_svc+0x8/0x208 >> [ 18.227143] Code: f9000bf3 aa0003f3 aa1e03e0 d503201f (b9405a60) >> [ 18.233435] ---[ end trace 835d756cd66aa959 ]--- >> [ 18.238621] Kernel panic - not syncing: Fatal exception >> [ 18.244014] Kernel Offset: 0x4a75fde00000 from 0xffff800010000000 >> [ 18.250299] PHYS_OFFSET: 0xffff99c680000000 >> [ 18.254613] CPU features: 0x0002,21806008 >> [ 18.258747] Memory Limit: none >> [ 18.262310] ---[ end Kernel panic - not syncing: Fatal exception = ]=E2=80=94 >>=20 >> I see that before secure world returns = OPTEE_SMC_RETURN_ENOTAVAIL(which >> Should disable and clear all the cache) we run into the crash trying = to free shm. >>=20 >> Thoughts? >=20 > It seems that the pointer is invalid, but the pointer doesn't look > like garbage. Could the kernel have unmapped the memory area covering > that address? >=20 Yes, I am not entirely sure if the kernel had the time to unmap the = memory. Right after triggering the crash the kdump kernel is booted and I see = the following [ 2.050145] optee: probing for conduit method.=20 [ 2.054743] optee: revision 3.6 (f84427aa)=20 [ 2.054821] optee: dynamic shared memory is enabled=20 [ 2.066186] optee: initialized driver=20 Could this be previous un-released maps causing corruption? Thanks.= 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 B4336C433ED for ; Thu, 6 May 2021 07:12:40 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2AFF261077 for ; Thu, 6 May 2021 07:12:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2AFF261077 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iPKG2hsN5b1jKef7ae4y76R1XyjbCQCViIR+h6mE= Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.60.0.2.21\)) Subject: Re: [PATCH v2 1/2] optee: fix tee out of memory failure seen during kexec reboot From: Allen Pais In-Reply-To: Date: Thu, 6 May 2021 12:40:40 +0530 Cc: Allen Pais , zajec5@gmail.com, bcm-kernel-feedback-list@broadcom.com, Linux ARM , Linux Kernel Mailing List , OP-TEE TrustedFirmware Message-Id: <51FC863B-96C5-47BA-8EBF-3D9FB6DE7DD2@linux.microsoft.com> References: <20210225090610.242623-1-allen.lkml@gmail.com> <20210225090610.242623-2-allen.lkml@gmail.com> <9a6c017c-d156-f939-f907-d6dfe83c41ac@linux.microsoft.com> <409F60D9-F0FB-4B69-B64B-CC6B3704038E@linux.microsoft.com> To: Jens Wiklander X-Mailer: Apple Mail (2.3654.60.0.2.21) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210506_001051_615386_A781735F X-CRM114-Status: GOOD ( 18.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: 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