From patchwork Fri Jan 17 12:49:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sandipan Das X-Patchwork-Id: 11338935 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 113E56C1 for ; Fri, 17 Jan 2020 12:50:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EBE352082F for ; Fri, 17 Jan 2020 12:50:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726587AbgAQMuz (ORCPT ); Fri, 17 Jan 2020 07:50:55 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:54446 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726506AbgAQMuz (ORCPT ); Fri, 17 Jan 2020 07:50:55 -0500 Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00HCl7vm137360 for ; Fri, 17 Jan 2020 07:50:54 -0500 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2xk0qgb43h-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 17 Jan 2020 07:50:53 -0500 Received: from localhost by e06smtp01.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Fri, 17 Jan 2020 12:50:47 -0000 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00HCokgf41288042 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 17 Jan 2020 12:50:46 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E512E52057; Fri, 17 Jan 2020 12:50:45 +0000 (GMT) Received: from fir03.in.ibm.com (unknown [9.121.59.65]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id 7F6F85204E; Fri, 17 Jan 2020 12:50:43 +0000 (GMT) From: Sandipan Das To: shuah@kernel.org, linux-kselftest@vger.kernel.org Cc: linux-arch@vger.kernel.org, fweimer@redhat.com, dave.hansen@intel.com, x86@kernel.org, linuxram@us.ibm.com, mhocko@kernel.org, linux-mm@kvack.org, mingo@redhat.com, aneesh.kumar@linux.ibm.com, bauerman@linux.ibm.com, msuchanek@suse.de, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v16 15/23] selftests/vm/pkeys: Fix assertion in test_pkey_alloc_exhaust() Date: Fri, 17 Jan 2020 18:19:54 +0530 X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-TM-AS-GCONF: 00 x-cbid: 20011712-4275-0000-0000-000003987CE1 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20011712-4276-0000-0000-000038AC7E43 Message-Id: <8f8e01c2885b6b463c4add91b21a82ac25b62603.1579265066.git.sandipan@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-17_03:2020-01-16,2020-01-17 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 suspectscore=2 lowpriorityscore=0 phishscore=0 spamscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=999 clxscore=1015 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001170102 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Ram Pai Some pkeys which are valid on the hardware are reserved and not available for application use. These keys cannot be allocated. test_pkey_alloc_exhaust() tries to account for these and has an assertion which validates if all available pkeys have been exahaustively allocated. However, the expression that is currently used is only valid for x86. On powerpc, a pkey is additionally reserved as compared to x86. Hence, the assertion is made to use an arch-specific helper to get the correct count of reserved pkeys. cc: Dave Hansen cc: Florian Weimer Signed-off-by: Ram Pai Signed-off-by: Sandipan Das --- tools/testing/selftests/vm/protection_keys.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/protection_keys.c b/tools/testing/selftests/vm/protection_keys.c index 90bb3a8cd78b..a91d11c6a0ec 100644 --- a/tools/testing/selftests/vm/protection_keys.c +++ b/tools/testing/selftests/vm/protection_keys.c @@ -1152,6 +1152,7 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey) dprintf3("%s()::%d\n", __func__, __LINE__); /* + * On x86: * There are 16 pkeys supported in hardware. Three are * allocated by the time we get here: * 1. The default key (0) @@ -1159,8 +1160,16 @@ void test_pkey_alloc_exhaust(int *ptr, u16 pkey) * 3. One allocated by the test code and passed in via * 'pkey' to this function. * Ensure that we can allocate at least another 13 (16-3). + * + * On powerpc: + * There are either 5, 28, 29 or 32 pkeys supported in + * hardware depending on the page size (4K or 64K) and + * platform (powernv or powervm). Four are allocated by + * the time we get here. These include pkey-0, pkey-1, + * exec-only pkey and the one allocated by the test code. + * Ensure that we can allocate the remaining. */ - pkey_assert(i >= NR_PKEYS-3); + pkey_assert(i >= (NR_PKEYS - get_arch_reserved_keys() - 1)); for (i = 0; i < nr_allocated_pkeys; i++) { err = sys_pkey_free(allocated_pkeys[i]);