Merge tag 'pull-request-2024-06-24' of https://gitlab.com/thuth/qemu into staging

* s390x error reporting clean ups
* fix memleak in qos_fuzz.c
* use correct byte order for pid field in s390x dumps
* Add a CONFIG switch to disable legacy s390x CPUs

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# gpg: Signature made Mon 24 Jun 2024 02:01:08 AM PDT
# gpg:                using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg:                issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg:                 aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg:                 aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# gpg:                 aka "Thomas Huth <huth@tuxfamily.org>" [full]

* tag 'pull-request-2024-06-24' of https://gitlab.com/thuth/qemu:
  target/s390x: Add a CONFIG switch to disable legacy CPUs
  MAINTAINERS: Cover all tests/qtest/migration-* files
  target/s390x/arch_dump: use correct byte order for pid
  tests/qtest/fuzz: fix memleak in qos_fuzz.c
  vfio/{ap, ccw}: Use warn_report_err() for IRQ notifier registration errors
  vfio/ccw: Fix the missed unrealize() call in error path
  vfio/ccw: Use the 'Error **errp' argument of vfio_ccw_realize()
  s390x/css: Make S390CCWDeviceClass::realize return bool
  hw/s390x/ccw: Remove local Error variable from s390_ccw_realize()
  s390x/css: Make CCWDeviceClass::realize return bool
  hw/s390x/ccw: Make s390_ccw_get_dev_info() return a bool

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

MAINTAINERS

@@ -3312,6 +3312,7 @@ F: tests/qtest/
 F: docs/devel/qgraph.rst
 F: docs/devel/qtest.rst
 X: tests/qtest/bios-tables-test*
+X: tests/qtest/migration-*
 
 Device Fuzzing
 M: Alexander Bulekov <alxndr@bu.edu>
@@ -3408,7 +3409,7 @@ F: include/qemu/userfaultfd.h
 F: migration/
 F: scripts/vmstate-static-checker.py
 F: tests/vmstate-static-checker-data/
-F: tests/qtest/migration-test.c
+F: tests/qtest/migration-*
 F: docs/devel/migration/
 F: qapi/migration.json
 F: tests/migration/

hw/s390x/ccw-device.c

@@ -31,9 +31,10 @@ static void ccw_device_refill_ids(CcwDevice *dev)
     dev->subch_id.valid = true;
 }
 
-static void ccw_device_realize(CcwDevice *dev, Error **errp)
+static bool ccw_device_realize(CcwDevice *dev, Error **errp)
 {
     ccw_device_refill_ids(dev);
+    return true;
 }
 
 static Property ccw_device_properties[] = {

hw/s390x/ccw-device.h

@@ -36,7 +36,7 @@ extern const VMStateDescription vmstate_ccw_dev;
 struct CCWDeviceClass {
     DeviceClass parent_class;
     void (*unplug)(HotplugHandler *, DeviceState *, Error **);
-    void (*realize)(CcwDevice *, Error **);
+    bool (*realize)(CcwDevice *, Error **);
     void (*refill_ids)(CcwDevice *);
 };
 

hw/s390x/s390-ccw.c

@@ -71,7 +71,7 @@ IOInstEnding s390_ccw_store(SubchDev *sch)
     return ret;
 }
 
-static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
+static bool s390_ccw_get_dev_info(S390CCWDevice *cdev,
                                   char *sysfsdev,
                                   Error **errp)
 {
@@ -84,12 +84,12 @@ static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
         error_setg(errp, "No host device provided");
         error_append_hint(errp,
                           "Use -device vfio-ccw,sysfsdev=PATH_TO_DEVICE\n");
-        return;
+        return false;
     }
 
     if (!realpath(sysfsdev, dev_path)) {
         error_setg_errno(errp, errno, "Host device '%s' not found", sysfsdev);
-        return;
+        return false;
     }
 
     cdev->mdevid = g_path_get_basename(dev_path);
@@ -98,30 +98,29 @@ static void s390_ccw_get_dev_info(S390CCWDevice *cdev,
     tmp = g_path_get_basename(tmp_dir);
     if (sscanf(tmp, "%2x.%1x.%4x", &cssid, &ssid, &devid) != 3) {
         error_setg_errno(errp, errno, "Failed to read %s", tmp);
-        return;
+        return false;
     }
 
     cdev->hostid.cssid = cssid;
     cdev->hostid.ssid = ssid;
     cdev->hostid.devid = devid;
     cdev->hostid.valid = true;
+    return true;
 }
 
-static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
+static bool s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
 {
     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
     CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev);
     DeviceState *parent = DEVICE(ccw_dev);
     SubchDev *sch;
     int ret;
-    Error *err = NULL;
 
-    s390_ccw_get_dev_info(cdev, sysfsdev, &err);
-    if (err) {
-        goto out_err_propagate;
+    if (!s390_ccw_get_dev_info(cdev, sysfsdev, errp)) {
+        return false;
     }
 
-    sch = css_create_sch(ccw_dev->devno, &err);
+    sch = css_create_sch(ccw_dev->devno, errp);
     if (!sch) {
         goto out_mdevid_free;
     }
@@ -132,19 +131,18 @@ static void s390_ccw_realize(S390CCWDevice *cdev, char *sysfsdev, Error **errp)
     ccw_dev->sch = sch;
     ret = css_sch_build_schib(sch, &cdev->hostid);
     if (ret) {
-        error_setg_errno(&err, -ret, "%s: Failed to build initial schib",
+        error_setg_errno(errp, -ret, "%s: Failed to build initial schib",
                          __func__);
         goto out_err;
     }
 
-    ck->realize(ccw_dev, &err);
-    if (err) {
+    if (!ck->realize(ccw_dev, errp)) {
         goto out_err;
     }
 
     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
                           parent->hotplugged, 1);
-    return;
+    return true;
 
 out_err:
     css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
@@ -152,8 +150,7 @@ out_err:
     g_free(sch);
 out_mdevid_free:
     g_free(cdev->mdevid);
-out_err_propagate:
-    error_propagate(errp, err);
+    return false;
 }
 
 static void s390_ccw_unrealize(S390CCWDevice *cdev)

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);

hw/vfio/ap.c

@@ -172,7 +172,7 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
          * Report this error, but do not make it a failing condition.
          * Lack of this IRQ in the host does not prevent normal operation.
          */
-        error_report_err(err);
+        warn_report_err(err);
     }
 
     return;

hw/vfio/ccw.c

@@ -582,14 +582,13 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 
     /* Call the class init function for subchannel. */
     if (cdc->realize) {
-        cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
-        if (err) {
-            goto out_err_propagate;
+        if (!cdc->realize(cdev, vcdev->vdev.sysfsdev, errp)) {
+            return;
         }
     }
 
     if (!vfio_device_get_name(vbasedev, errp)) {
-        return;
+        goto out_unrealize;
     }
 
     if (!vfio_attach_device(cdev->mdevid, vbasedev,
@@ -597,17 +596,17 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
         goto out_attach_dev_err;
     }
 
-    if (!vfio_ccw_get_region(vcdev, &err)) {
+    if (!vfio_ccw_get_region(vcdev, errp)) {
         goto out_region_err;
     }
 
-    if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err)) {
+    if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, errp)) {
         goto out_io_notifier_err;
     }
 
     if (vcdev->crw_region) {
         if (!vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX,
-                                            &err)) {
+                                            errp)) {
             goto out_irq_notifier_err;
         }
     }
@@ -617,7 +616,7 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
          * Report this error, but do not make it a failing condition.
          * Lack of this IRQ in the host does not prevent normal operation.
          */
-        error_report_err(err);
+        warn_report_err(err);
     }
 
     return;
@@ -632,11 +631,10 @@ out_region_err:
     vfio_detach_device(vbasedev);
 out_attach_dev_err:
     g_free(vbasedev->name);
+out_unrealize:
     if (cdc->unrealize) {
         cdc->unrealize(cdev);
     }
-out_err_propagate:
-    error_propagate(errp, err);
 }
 
 static void vfio_ccw_unrealize(DeviceState *dev)

include/hw/s390x/s390-ccw.h

@@ -31,7 +31,7 @@ struct S390CCWDevice {
 
 struct S390CCWDeviceClass {
     CCWDeviceClass parent_class;
-    void (*realize)(S390CCWDevice *dev, char *sysfsdev, Error **errp);
+    bool (*realize)(S390CCWDevice *dev, char *sysfsdev, Error **errp);
     void (*unrealize)(S390CCWDevice *dev);
     IOInstEnding (*handle_request) (SubchDev *sch);
     int (*handle_halt) (SubchDev *sch);

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

target/s390x/arch_dump.c

@@ -102,7 +102,7 @@ static void s390x_write_elf64_prstatus(Note *note, S390CPU *cpu, int id)
         regs->acrs[i] = cpu_to_be32(cpu->env.aregs[i]);
         regs->gprs[i] = cpu_to_be64(cpu->env.regs[i]);
     }
-    note->contents.prstatus.pid = id;
+    note->contents.prstatus.pid = cpu_to_be32(id);
 }
 
 static void s390x_write_elf64_fpregset(Note *note, S390CPU *cpu, int id)

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"),

tests/qtest/fuzz/qos_fuzz.c

@@ -180,6 +180,7 @@ static void walk_path(QOSGraphNode *orig_path, int len)
 
         fuzz_path_vec = path_vec;
     } else {
+        g_string_free(cmd_line, true);
         g_free(path_vec);
     }