target/s390x: Add a CONFIG switch to disable legacy CPUs

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 <thuth@redhat.com>

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 3d0bc3e7f2e5c650962a16260d56205690f23fff..cd063f8b645917046f969b7649716158696cc09d 100644 (file)
--- 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
 
 static Error *pv_mig_blocker;
 
@@ -1126,6 +1127,8 @@ static void ccw_machine_2_12_class_options(MachineClass *mc)
 }
 DEFINE_CCW_MACHINE(2_12, "2.12", false);
 
+#ifdef CONFIG_S390X_LEGACY_CPUS
+
 static void ccw_machine_2_11_instance_options(MachineState *machine)
 {
     static const S390FeatInit qemu_cpu_feat = { S390_FEAT_LIST_QEMU_V2_11 };
@@ -1272,6 +1275,8 @@ static void ccw_machine_2_4_class_options(MachineClass *mc)
 }
 DEFINE_CCW_MACHINE(2_4, "2.4", false);
 
+#endif
+
 static void ccw_machine_register_types(void)
 {
     type_register_static(&ccw_machine_info);

diff --git a/target/s390x/Kconfig b/target/s390x/Kconfig
index d886be48b4784504eeaea347bdb9b09ecc883b03..8a95f2bc3ff706c24e62e06e563d6d70401fdc27 100644 (file)
--- 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

diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index efb508cd2e91847fd6fef107559a9ce606b1ffee..a27f4b6f79b2c876811d6c6209d96a9185b3faa0 100644 (file)
--- 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
 
 #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 deprecated.
  */
 static S390CPUDef s390_cpu_defs[] = {
+    /*
+     * Linux requires at least z10 nowadays, and IBM only supports recent CPUs
+     * (see https://www.ibm.com/support/pages/ibm-mainframe-life-cycle-history),
+     * 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 GA1"),
     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[] = {
     CPUDEF_INIT(0x2096, 9, 2, 40, 0x00000000U, "z9BC", "IBM System z9 BC GA1"),
     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 EC 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 BC GA1"),