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[23.128.96.18]) by mx.google.com with ESMTP id n3si19386494jap.45.2021.05.25.19.37.15; Tue, 25 May 2021 19:37:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232340AbhEZAWA (ORCPT + 99 others); Tue, 25 May 2021 20:22:00 -0400 Received: from mga07.intel.com ([134.134.136.100]:52937 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232308AbhEZAV6 (ORCPT ); Tue, 25 May 2021 20:21:58 -0400 IronPort-SDR: Jb5klALS/rFHFvlhLEuvrMtFIpeS9xEW2DwygyR0EZrxAoIxbhhWTVJTpILxq2BC/zJyM+R5LG lF9z+ICvSE1g== X-IronPort-AV: E=McAfee;i="6200,9189,9995"; a="266237295" X-IronPort-AV: E=Sophos;i="5.82,329,1613462400"; d="scan'208";a="266237295" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 May 2021 17:20:27 -0700 IronPort-SDR: km0Ks/DHnTz/S9yi9qv3aB93uiJCFKtI9NZYvsq0PJq9xt9XdzDslvsL+4PAVjVfp+OnzTxs+j OpkvgQ0oi8OQ== X-IronPort-AV: E=Sophos;i="5.82,329,1613462400"; d="scan'208";a="476676646" Received: from krlloyd-mobl3.amr.corp.intel.com (HELO [10.255.229.251]) ([10.255.229.251]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 May 2021 17:20:24 -0700 Subject: Re: x86/fpu/xsave: protection key test failures To: Babu Moger , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, shuah@kernel.org, jroedel@suse.de, ubizjak@gmail.com, viro@zeniv.linux.org.uk, jpa@git.mail.kapsi.fi, fenghua.yu@intel.com, kan.liang@linux.intel.com, akpm@linux-foundation.org, rppt@kernel.org, Fan_Yang@sjtu.edu.cn, anshuman.khandual@arm.com, b.thiel@posteo.de, jgross@suse.com, keescook@chromium.org, seanjc@google.com, mh@glandium.org, sashal@kernel.org, krisman@collabora.com, chang.seok.bae@intel.com, 0x7f454c46@gmail.com, jhubbard@nvidia.com, sandipan@linux.ibm.com, ziy@nvidia.com, kirill.shutemov@linux.intel.com, suxingxing@loongson.cn, harish@linux.ibm.com, rong.a.chen@intel.com, linuxram@us.ibm.com, bauerman@linux.ibm.com, dave.kleikamp@oracle.com References: <7a407363-e074-aa84-3ca1-909b497122aa@intel.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/25/21 5:03 PM, Babu Moger wrote: >> What values do PKRU and the shadow have when the test fails? Is PKRU 0? > It goes back to default value 0x55555554. The test is expecting it to be > 0. Printed them below. > > test_ptrace_of_child()::1346, pkey_reg: 0x0000000055555554 shadow: > 0000000000000000 > protection_keys_64: pkey-helpers.h:127: _read_pkey_reg: Assertion > `pkey_reg == shadow_pkey_reg' failed. That's backwards (shadow vs pkru) from what I was expecting. Can you turn on all the debuging? Just compile with -DDEBUG_LEVEL=5