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Fri, 08 May 2020 17:49:24 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 048HnLFm63504400 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 8 May 2020 17:49:21 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 58BD0AE045; Fri, 8 May 2020 17:49:21 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BFD87AE04D; Fri, 8 May 2020 17:49:19 +0000 (GMT) Received: from fir03.in.ibm.com (unknown [9.121.59.65]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 8 May 2020 17:49:19 +0000 (GMT) From: Sandipan Das To: akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linuxram@us.ibm.com, aneesh.kumar@linux.ibm.com, bauerman@linux.ibm.com, mpe@ellerman.id.au, fweimer@redhat.com Subject: [PATCH 2/2] selftests: vm: pkeys: Fix powerpc access right updates Date: Fri, 8 May 2020 23:19:15 +0530 Message-Id: <5f65cf37be993760de8112a88da194e3ccbb2bf8.1588959697.git.sandipan@linux.ibm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: In-Reply-To: References: X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.676 definitions=2020-05-08_15:2020-05-08,2020-05-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 bulkscore=0 mlxscore=0 impostorscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 suspectscore=1 phishscore=0 clxscore=1015 priorityscore=1501 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005080144 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The Power ISA mandates that all writes to the Authority Mask Register (AMR) must always be preceded as well as succeeded by a context-synchronizing instruction. This applies to both the privileged and unprivileged variants of the Move To AMR instruction. Fixes: 130f573c2a79 ("selftests/vm/pkeys: introduce powerpc support") Reported-by: Aneesh Kumar K.V Suggested-by: Aneesh Kumar K.V Signed-off-by: Sandipan Das --- tools/testing/selftests/vm/pkey-powerpc.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/vm/pkey-powerpc.h b/tools/testing/selftests/vm/pkey-powerpc.h index eb5077de8f1e..1ebb586b2fbc 100644 --- a/tools/testing/selftests/vm/pkey-powerpc.h +++ b/tools/testing/selftests/vm/pkey-powerpc.h @@ -55,7 +55,8 @@ static inline void __write_pkey_reg(u64 pkey_reg) dprintf4("%s() changing %016llx to %016llx\n", __func__, __read_pkey_reg(), pkey_reg); - asm volatile("mtspr 0xd, %0" : : "r" ((unsigned long)(amr)) : "memory"); + asm volatile("isync; mtspr 0xd, %0; isync" + : : "r" ((unsigned long)(amr)) : "memory"); dprintf4("%s() pkey register after changing %016llx to %016llx\n", __func__, __read_pkey_reg(), pkey_reg);