From nobody Wed Nov 5 02:54:33 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1500976014796420.33027711454395; Tue, 25 Jul 2017 02:46:54 -0700 (PDT) Received: from localhost ([::1]:59512 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dZwQW-0006sL-Ee for importer@patchew.org; Tue, 25 Jul 2017 05:46:52 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44261) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dZwKy-000276-Dj for qemu-devel@nongnu.org; Tue, 25 Jul 2017 05:41:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dZwKu-0003lo-DH for qemu-devel@nongnu.org; Tue, 25 Jul 2017 05:41:08 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40266) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dZwKu-0003lM-5r for qemu-devel@nongnu.org; Tue, 25 Jul 2017 05:41:04 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0941B7F403; Tue, 25 Jul 2017 09:41:03 +0000 (UTC) Received: from localhost (ovpn-116-214.ams2.redhat.com [10.36.116.214]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 92A76189FE; Tue, 25 Jul 2017 09:41:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 0941B7F403 Authentication-Results: ext-mx01.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx01.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=cohuck@redhat.com From: Cornelia Huck To: peter.maydell@linaro.org Date: Tue, 25 Jul 2017 11:40:20 +0200 Message-Id: <20170725094026.5376-9-cohuck@redhat.com> In-Reply-To: <20170725094026.5376-1-cohuck@redhat.com> References: <20170725094026.5376-1-cohuck@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 25 Jul 2017 09:41:03 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL for-2.10 08/14] target/s390x: improve baselining if certain base features are missing X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, david@redhat.com, Cornelia Huck , qemu-devel@nongnu.org, agraf@suse.de, borntraeger@de.ibm.com, rth@twiddle.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Hildenbrand There are certain features that we put into base models, but that are not relevant for the actual search. The most famous example are MSA subfunctions that might be disabled on certain real hardware out there. While the kvm host model detection will usually detect the correct model on such machines (as it will in the common case not pass features to check for into s390_find_cpu_def()), baselining will fall back to a quite old model just because some MSA subfunctions are missing. Let's improve that by ignoring lack of these features while performing the search for a base model. Signed-off-by: David Hildenbrand Message-Id: <20170720123721.12366-6-david@redhat.com> Signed-off-by: Cornelia Huck --- target/s390x/cpu_models.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c index d91b7b85f6..fa1338fc72 100644 --- a/target/s390x/cpu_models.c +++ b/target/s390x/cpu_models.c @@ -78,6 +78,9 @@ static S390CPUDef s390_cpu_defs[] =3D { CPUDEF_INIT(0x3906, 14, 1, 47, 0x08000000U, "z14", "IBM z14 GA1"), }; =20 +/* features part of a base model but not relevant for finding a base model= */ +S390FeatBitmap ignored_base_feat; + void s390_cpudef_featoff(uint8_t gen, uint8_t ec_ga, S390Feat feat) { const S390CPUDef *def; @@ -237,6 +240,11 @@ const S390CPUDef *s390_find_cpu_def(uint16_t type, uin= t8_t gen, uint8_t ec_ga, if (features) { /* see if the model satisfies the minimum features */ bitmap_andnot(missing, def->base_feat, features, S390_FEAT_MAX= ); + /* + * Ignore certain features that are in the base model, but not + * relevant for the search (esp. MSA subfunctions). + */ + bitmap_andnot(missing, missing, ignored_base_feat, S390_FEAT_M= AX); if (!bitmap_empty(missing, S390_FEAT_MAX)) { break; } @@ -1210,10 +1218,35 @@ static const TypeInfo host_s390_cpu_type_info =3D { }; #endif =20 +static void init_ignored_base_feat(void) +{ + static const int feats[] =3D { + /* MSA subfunctions that could not be available on certain machin= es */ + S390_FEAT_KMAC_DEA, + S390_FEAT_KMAC_TDEA_128, + S390_FEAT_KMAC_TDEA_192, + S390_FEAT_KMC_DEA, + S390_FEAT_KMC_TDEA_128, + S390_FEAT_KMC_TDEA_192, + S390_FEAT_KM_DEA, + S390_FEAT_KM_TDEA_128, + S390_FEAT_KM_TDEA_192, + S390_FEAT_KIMD_SHA_1, + S390_FEAT_KLMD_SHA_1, + }; + int i; + + for (i =3D 0; i < ARRAY_SIZE(feats); i++) { + set_bit(feats[i], ignored_base_feat); + } +} + static void register_types(void) { int i; =20 + init_ignored_base_feat(); + /* init all bitmaps from gnerated data initially */ for (i =3D 0; i < ARRAY_SIZE(s390_cpu_defs); i++) { s390_init_feat_bitmap(s390_cpu_defs[i].base_init, --=20 2.13.3