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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1719220288; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3z5NAOaj1jkkPYGiKOcuGY5xJ/VoMG76a1jxQ0hvELY=; b=bK7ucC94NvP9QfIjMJvchgfWs2vhyRqCz4bVcO1vF66+LHZuE4hcrPAY1HmqtUPFJhVucs IXDlPkgGw9eiZrRDZc6kDiOSkg1uG4w19/LuAOZaeblBlSdqomdQz6rX+d7Eozrpvd6qoW Tfn1XInkx9flMjOoyReFeHAZk6FR+HM= X-MC-Unique: hjLTpm5kNYmieW4d-YDe3A-1 From: Thomas Huth To: qemu-devel@nongnu.org, Richard Henderson Subject: [PULL 11/11] target/s390x: Add a CONFIG switch to disable legacy CPUs Date: Mon, 24 Jun 2024 11:10:43 +0200 Message-ID: <20240624091043.177484-12-thuth@redhat.com> In-Reply-To: <20240624091043.177484-1-thuth@redhat.com> References: <20240624091043.177484-1-thuth@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 11 X-Spam_score: 1.1 X-Spam_bar: + X-Spam_report: (1.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.149, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_SBL_CSS=3.335, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1719220363593100005 Content-Type: text/plain; charset="utf-8" The oldest model that IBM still supports is the z13. Considering that each generation can "emulate" the previous two generations in hardware (via the "IBC" feature of the CPUs), this means that everything that is older than z114/196 is not an officially supported CPU model anymore. The Linux kernel still support the z10, so if we also take this into account, everything older than that can definitely be considered as a legacy CPU model. For downstream builds of QEMU, we would like to be able to disable these legacy CPUs in the build. Thus add a CONFIG switch that can be used to disable them (and old machine types that use them by default). Message-Id: <20240614125019.588928-1-thuth@redhat.com> Signed-off-by: Thomas Huth --- hw/s390x/s390-virtio-ccw.c | 5 +++++ target/s390x/cpu_models.c | 9 +++++++++ target/s390x/Kconfig | 5 +++++ 3 files changed, 19 insertions(+) diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c index 3d0bc3e7f2..cd063f8b64 100644 --- a/hw/s390x/s390-virtio-ccw.c +++ b/hw/s390x/s390-virtio-ccw.c @@ -47,6 +47,7 @@ #include "migration/blocker.h" #include "qapi/visitor.h" #include "hw/s390x/cpu-topology.h" +#include CONFIG_DEVICES =20 static Error *pv_mig_blocker; =20 @@ -1126,6 +1127,8 @@ static void ccw_machine_2_12_class_options(MachineCla= ss *mc) } DEFINE_CCW_MACHINE(2_12, "2.12", false); =20 +#ifdef CONFIG_S390X_LEGACY_CPUS + static void ccw_machine_2_11_instance_options(MachineState *machine) { static const S390FeatInit qemu_cpu_feat =3D { S390_FEAT_LIST_QEMU_V2_1= 1 }; @@ -1272,6 +1275,8 @@ static void ccw_machine_2_4_class_options(MachineClas= s *mc) } DEFINE_CCW_MACHINE(2_4, "2.4", false); =20 +#endif + static void ccw_machine_register_types(void) { type_register_static(&ccw_machine_info); diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c index efb508cd2e..a27f4b6f79 100644 --- a/target/s390x/cpu_models.c +++ b/target/s390x/cpu_models.c @@ -25,6 +25,7 @@ #ifndef CONFIG_USER_ONLY #include "sysemu/sysemu.h" #include "target/s390x/kvm/pv.h" +#include CONFIG_DEVICES #endif =20 #define CPUDEF_INIT(_type, _gen, _ec_ga, _mha_pow, _hmfai, _name, _desc) \ @@ -47,6 +48,13 @@ * generation 15 one base feature and one optional feature have been depre= cated. */ static S390CPUDef s390_cpu_defs[] =3D { + /* + * Linux requires at least z10 nowadays, and IBM only supports recent = CPUs + * (see https://www.ibm.com/support/pages/ibm-mainframe-life-cycle-his= tory), + * so we consider older CPUs as legacy that can optionally be disabled= via + * the CONFIG_S390X_LEGACY_CPUS config switch. + */ +#if defined(CONFIG_S390X_LEGACY_CPUS) || defined(CONFIG_USER_ONLY) CPUDEF_INIT(0x2064, 7, 1, 38, 0x00000000U, "z900", "IBM zSeries 900 GA= 1"), CPUDEF_INIT(0x2064, 7, 2, 38, 0x00000000U, "z900.2", "IBM zSeries 900 = GA2"), CPUDEF_INIT(0x2064, 7, 3, 38, 0x00000000U, "z900.3", "IBM zSeries 900 = GA3"), @@ -64,6 +72,7 @@ static S390CPUDef s390_cpu_defs[] =3D { CPUDEF_INIT(0x2096, 9, 2, 40, 0x00000000U, "z9BC", "IBM System z9 BC G= A1"), CPUDEF_INIT(0x2094, 9, 3, 40, 0x00000000U, "z9EC.3", "IBM System z9 EC= GA3"), CPUDEF_INIT(0x2096, 9, 3, 40, 0x00000000U, "z9BC.2", "IBM System z9 BC= GA2"), +#endif CPUDEF_INIT(0x2097, 10, 1, 43, 0x00000000U, "z10EC", "IBM System z10 E= C GA1"), CPUDEF_INIT(0x2097, 10, 2, 43, 0x00000000U, "z10EC.2", "IBM System z10= EC GA2"), CPUDEF_INIT(0x2098, 10, 2, 43, 0x00000000U, "z10BC", "IBM System z10 B= C GA1"), diff --git a/target/s390x/Kconfig b/target/s390x/Kconfig index d886be48b4..8a95f2bc3f 100644 --- a/target/s390x/Kconfig +++ b/target/s390x/Kconfig @@ -2,3 +2,8 @@ config S390X bool select PCI select S390_FLIC + +config S390X_LEGACY_CPUS + bool + default y + depends on S390X --=20 2.45.2