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Fri, 15 Jul 2022 09:32:08 +0000 (GMT) Date: Fri, 15 Jul 2022 11:32:06 +0200 From: Heiko Carstens To: Hendrik Brueckner Cc: Steffen Eiden , Alexander Gordeev , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , Vasily Gorbik , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nrb@linux.ibm.com Subject: Re: [PATCH v2 1/3] s390/cpufeature: rework to allow more than only hwcap bits Message-ID: References: <20220713125644.16121-1-seiden@linux.ibm.com> <20220713125644.16121-2-seiden@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: uxpusP8BxJnU9AAzIWUty2EOtDTXQsTT X-Proofpoint-ORIG-GUID: uxpusP8BxJnU9AAzIWUty2EOtDTXQsTT X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-15_03,2022-07-14_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=719 mlxscore=0 suspectscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 malwarescore=0 spamscore=0 bulkscore=0 adultscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207150039 ARC-Authentication-Results: i=1; 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dkim=pass header.d=ibm.com header.s=pp1 header.b=eUE93Xyb; dmarc=pass (policy=none) header.from=ibm.com; spf=pass (imf03.hostedemail.com: domain of hca@linux.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=hca@linux.ibm.com X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: DB2E920043 X-Rspam-User: X-Stat-Signature: tgf1ozihcczbofbyqkgg311t96br89wb X-HE-Tag: 1657877534-825411 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000005, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jul 15, 2022 at 09:59:49AM +0200, Hendrik Brueckner wrote: > Regarding facility bits for cpu features: Initially, I used > MSA hwcap to cover all ciphers among all hw generations. With facility bit > checks, it makes more sense to fine-tune and load based on respective > MSA level or CPACF functions that is required for ciphers/hashes. ... > > -module_cpu_feature_match(MSA, init); > > +module_cpu_feature_match(S390_CPU_FEATURE_MSA, init); > > module_exit(fini); > > which becomes automatically loaded if (any) MSA is available and then > performs this check: > > cpacf_query_func(CPACF_KIMD, CPACF_KIMD_SHA_512 > > which in the worst case would fail. > > This might be a very useful follow-up patch to remove those mod init checks > into the cpu feature. Yes, that makes a lot of sense. Thanks for suggesting this!