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117 lines
4.4 KiB
117 lines
4.4 KiB
1 month ago
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From d0f88c7a0c95b4d9ab03221400736cb17cb4b995 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Thu, 13 Jun 2024 16:14:22 +0200
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Subject: [PATCH 10/14] target/s390x: Add a CONFIG switch to disable legacy
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CPUs
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 252: s390x: remove legacy CPU types
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RH-Jira: RHEL-39898
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RH-Acked-by: Cédric Le Goater <clg@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [3/5] f8e78c8e0349c8645e7df7b0bebed1635865b454 (thuth/qemu-kvm-cs9)
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The oldest model that IBM still supports is the z13. Considering
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that each generation can "emulate" the previous two generations
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in hardware (via the "IBC" feature of the CPUs), this means that
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everything that is older than z114/196 is not an officially supported
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CPU model anymore. The Linux kernel still support the z10, so if
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we also take this into account, everything older than that can
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definitely be considered as a legacy CPU model.
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For downstream builds of QEMU, we would like to be able to disable
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these legacy CPUs in the build. Thus add a CONFIG switch that can be
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used to disable them (and old machine types that use them by default).
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Message-Id: <20240614125019.588928-1-thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit d6a7c3f44cf3f60c066dbf087ef79d4b12acc642)
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---
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hw/s390x/s390-virtio-ccw.c | 4 ++++
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target/s390x/Kconfig | 5 +++++
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target/s390x/cpu_models.c | 9 +++++++++
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3 files changed, 18 insertions(+)
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diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
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index b0b903b78c..527b05d1d6 100644
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--- a/hw/s390x/s390-virtio-ccw.c
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+++ b/hw/s390x/s390-virtio-ccw.c
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@@ -46,6 +46,7 @@
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#include "migration/blocker.h"
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#include "qapi/visitor.h"
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#include "hw/s390x/cpu-topology.h"
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+#include CONFIG_DEVICES
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static Error *pv_mig_blocker;
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@@ -1130,6 +1131,8 @@ static void ccw_machine_2_12_class_options(MachineClass *mc)
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}
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DEFINE_CCW_MACHINE(2_12, "2.12", false);
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+#ifdef CONFIG_S390X_LEGACY_CPUS
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+
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static void ccw_machine_2_11_instance_options(MachineState *machine)
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{
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static const S390FeatInit qemu_cpu_feat = { S390_FEAT_LIST_QEMU_V2_11 };
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@@ -1277,6 +1280,7 @@ static void ccw_machine_2_4_class_options(MachineClass *mc)
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DEFINE_CCW_MACHINE(2_4, "2.4", false);
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#endif
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+#endif
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static void ccw_machine_rhel940_instance_options(MachineState *machine)
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{
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diff --git a/target/s390x/Kconfig b/target/s390x/Kconfig
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index d886be48b4..8a95f2bc3f 100644
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--- a/target/s390x/Kconfig
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+++ b/target/s390x/Kconfig
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@@ -2,3 +2,8 @@ config S390X
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bool
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select PCI
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select S390_FLIC
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+
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+config S390X_LEGACY_CPUS
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+ bool
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+ default y
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+ depends on S390X
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diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
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index 370b3b3065..f4dbcc67bb 100644
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--- a/target/s390x/cpu_models.c
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+++ b/target/s390x/cpu_models.c
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@@ -25,6 +25,7 @@
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#ifndef CONFIG_USER_ONLY
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#include "sysemu/sysemu.h"
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#include "target/s390x/kvm/pv.h"
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+#include CONFIG_DEVICES
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#endif
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#define CPUDEF_INIT(_type, _gen, _ec_ga, _mha_pow, _hmfai, _name, _desc) \
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@@ -50,6 +51,13 @@
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#define RHEL_CPU_DEPRECATION "use at least 'z14', or 'host' / 'qemu' / 'max'"
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static S390CPUDef s390_cpu_defs[] = {
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+ /*
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+ * Linux requires at least z10 nowadays, and IBM only supports recent CPUs
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+ * (see https://www.ibm.com/support/pages/ibm-mainframe-life-cycle-history),
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+ * so we consider older CPUs as legacy that can optionally be disabled via
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+ * the CONFIG_S390X_LEGACY_CPUS config switch.
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+ */
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+#if defined(CONFIG_S390X_LEGACY_CPUS) || defined(CONFIG_USER_ONLY)
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CPUDEF_INIT(0x2064, 7, 1, 38, 0x00000000U, "z900", "IBM zSeries 900 GA1"),
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CPUDEF_INIT(0x2064, 7, 2, 38, 0x00000000U, "z900.2", "IBM zSeries 900 GA2"),
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CPUDEF_INIT(0x2064, 7, 3, 38, 0x00000000U, "z900.3", "IBM zSeries 900 GA3"),
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@@ -67,6 +75,7 @@ static S390CPUDef s390_cpu_defs[] = {
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CPUDEF_INIT(0x2096, 9, 2, 40, 0x00000000U, "z9BC", "IBM System z9 BC GA1"),
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CPUDEF_INIT(0x2094, 9, 3, 40, 0x00000000U, "z9EC.3", "IBM System z9 EC GA3"),
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CPUDEF_INIT(0x2096, 9, 3, 40, 0x00000000U, "z9BC.2", "IBM System z9 BC GA2"),
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+#endif
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CPUDEF_INIT(0x2097, 10, 1, 43, 0x00000000U, "z10EC", "IBM System z10 EC GA1"),
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CPUDEF_INIT(0x2097, 10, 2, 43, 0x00000000U, "z10EC.2", "IBM System z10 EC GA2"),
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CPUDEF_INIT(0x2098, 10, 2, 43, 0x00000000U, "z10BC", "IBM System z10 BC GA1"),
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--
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2.39.3
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