hw/s390x/s390-stattrib.c - qemu - Git at Google

 /*
  * s390 storage attributes device
  *
  * Copyright 2016 IBM Corp.
  * Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or (at
  * your option) any later version. See the COPYING file in the top-level
  * directory.
  */

 #include "qemu/osdep.h"
 #include "qemu/units.h"
 #include "migration/qemu-file.h"
 #include "migration/register.h"
 #include "hw/qdev-properties.h"
 #include "hw/s390x/storage-attributes.h"
 #include "qemu/error-report.h"
 #include "exec/ram_addr.h"
 #include "qapi/error.h"
 #include "qapi/qmp/qdict.h"
 #include "cpu.h"

 /* 512KiB cover 2GB of guest memory */
 #define CMMA_BLOCK_SIZE  (512 * KiB)

 #define STATTR_FLAG_EOS     0x01ULL
 #define STATTR_FLAG_MORE    0x02ULL
 #define STATTR_FLAG_ERROR   0x04ULL
 #define STATTR_FLAG_DONE    0x08ULL

 static S390StAttribState *s390_get_stattrib_device(void)
 {
     S390StAttribState *sas;

     sas = S390_STATTRIB(object_resolve_path_type("", TYPE_S390_STATTRIB, NULL));
     assert(sas);
     return sas;
 }

 void s390_stattrib_init(void)
 {
     Object *obj;

     obj = kvm_s390_stattrib_create();
     if (!obj) {
         obj = object_new(TYPE_QEMU_S390_STATTRIB);
     }

     object_property_add_child(qdev_get_machine(), TYPE_S390_STATTRIB,
                               obj);
     object_unref(obj);

     qdev_realize(DEVICE(obj), NULL, &error_fatal);
 }

 /* Console commands: */

 void hmp_migrationmode(Monitor *mon, const QDict *qdict)
 {
     S390StAttribState *sas = s390_get_stattrib_device();
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     uint64_t what = qdict_get_int(qdict, "mode");
     Error *local_err = NULL;
     int r;

     r = sac->set_migrationmode(sas, what, &local_err);
     if (r < 0) {
         monitor_printf(mon, "Error: %s", error_get_pretty(local_err));
         error_free(local_err);
     }
 }

 void hmp_info_cmma(Monitor *mon, const QDict *qdict)
 {
     S390StAttribState *sas = s390_get_stattrib_device();
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     uint64_t addr = qdict_get_int(qdict, "addr");
     uint64_t buflen = qdict_get_try_int(qdict, "count", 8);
     uint8_t *vals;
     int cx, len;

     vals = g_try_malloc(buflen);
     if (!vals) {
         monitor_printf(mon, "Error: %s\n", strerror(errno));
         return;
     }

     len = sac->peek_stattr(sas, addr / TARGET_PAGE_SIZE, buflen, vals);
     if (len < 0) {
         monitor_printf(mon, "Error: %s", strerror(-len));
         goto out;
     }

     monitor_printf(mon, "  CMMA attributes, "
                    "pages %" PRIu64 "+%d (0x%" PRIx64 "):\n",
                    addr / TARGET_PAGE_SIZE, len, addr & ~TARGET_PAGE_MASK);
     for (cx = 0; cx < len; cx++) {
         if (cx % 8 == 7) {
             monitor_printf(mon, "%02x\n", vals[cx]);
         } else {
             monitor_printf(mon, "%02x", vals[cx]);
         }
     }
     monitor_printf(mon, "\n");

 out:
     g_free(vals);
 }

 /* Migration support: */

 static int cmma_load(QEMUFile *f, void *opaque, int version_id)
 {
     S390StAttribState *sas = S390_STATTRIB(opaque);
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     uint64_t count, cur_gfn;
     int flags, ret = 0;
     ram_addr_t addr;
     uint8_t *buf;

     while (!ret) {
         addr = qemu_get_be64(f);
         flags = addr & ~TARGET_PAGE_MASK;
         addr &= TARGET_PAGE_MASK;

         switch (flags) {
         case STATTR_FLAG_MORE: {
             cur_gfn = addr / TARGET_PAGE_SIZE;
             count = qemu_get_be64(f);
             buf = g_try_malloc(count);
             if (!buf) {
                 error_report("cmma_load could not allocate memory");
                 ret = -ENOMEM;
                 break;
             }

             qemu_get_buffer(f, buf, count);
             ret = sac->set_stattr(sas, cur_gfn, count, buf);
             if (ret < 0) {
                 error_report("Error %d while setting storage attributes", ret);
             }
             g_free(buf);
             break;
         }
         case STATTR_FLAG_ERROR: {
             error_report("Storage attributes data is incomplete");
             ret = -EINVAL;
             break;
         }
         case STATTR_FLAG_DONE:
             /* This is after the last pre-copied value has been sent, nothing
              * more will be sent after this. Pre-copy has finished, and we
              * are done flushing all the remaining values. Now the target
              * system is about to take over. We synchronize the buffer to
              * apply the actual correct values where needed.
              */
              sac->synchronize(sas);
             break;
         case STATTR_FLAG_EOS:
             /* Normal exit */
             return 0;
         default:
             error_report("Unexpected storage attribute flag data: %#x", flags);
             ret = -EINVAL;
         }
     }

     return ret;
 }

 static int cmma_save_setup(QEMUFile *f, void *opaque, Error **errp)
 {
     S390StAttribState *sas = S390_STATTRIB(opaque);
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     int res;
     /*
      * Signal that we want to start a migration, thus needing PGSTE dirty
      * tracking.
      */
     res = sac->set_migrationmode(sas, true, errp);
     if (res) {
         return res;
     }
     qemu_put_be64(f, STATTR_FLAG_EOS);
     return 0;
 }

 static void cmma_state_pending(void *opaque, uint64_t *must_precopy,
                                uint64_t *can_postcopy)
 {
     S390StAttribState *sas = S390_STATTRIB(opaque);
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     long long res = sac->get_dirtycount(sas);

     if (res >= 0) {
         *must_precopy += res;
     }
 }

 static int cmma_save(QEMUFile *f, void *opaque, int final)
 {
     S390StAttribState *sas = S390_STATTRIB(opaque);
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     uint8_t *buf;
     int r, cx, reallen = 0, ret = 0;
     uint32_t buflen = CMMA_BLOCK_SIZE;
     uint64_t start_gfn = sas->migration_cur_gfn;

     buf = g_try_malloc(buflen);
     if (!buf) {
         error_report("Could not allocate memory to save storage attributes");
         return -ENOMEM;
     }

     while (final ? 1 : migration_rate_exceeded(f) == 0) {
         reallen = sac->get_stattr(sas, &start_gfn, buflen, buf);
         if (reallen < 0) {
             g_free(buf);
             return reallen;
         }

         ret = 1;
         if (!reallen) {
             break;
         }
         qemu_put_be64(f, (start_gfn << TARGET_PAGE_BITS) | STATTR_FLAG_MORE);
         qemu_put_be64(f, reallen);
         for (cx = 0; cx < reallen; cx++) {
             qemu_put_byte(f, buf[cx]);
         }
         if (!sac->get_dirtycount(sas)) {
             break;
         }
     }

     sas->migration_cur_gfn = start_gfn + reallen;
     g_free(buf);
     if (final) {
         qemu_put_be64(f, STATTR_FLAG_DONE);
     }
     qemu_put_be64(f, STATTR_FLAG_EOS);

     r = qemu_file_get_error(f);
     if (r < 0) {
         return r;
     }

     return ret;
 }

 static int cmma_save_iterate(QEMUFile *f, void *opaque)
 {
     return cmma_save(f, opaque, 0);
 }

 static int cmma_save_complete(QEMUFile *f, void *opaque)
 {
     return cmma_save(f, opaque, 1);
 }

 static void cmma_save_cleanup(void *opaque)
 {
     S390StAttribState *sas = S390_STATTRIB(opaque);
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     sac->set_migrationmode(sas, false, NULL);
 }

 static bool cmma_active(void *opaque)
 {
     S390StAttribState *sas = S390_STATTRIB(opaque);
     S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
     return sac->get_active(sas);
 }

 /* QEMU object: */

 static void qemu_s390_stattrib_instance_init(Object *obj)
 {
 }

 static int qemu_s390_peek_stattr_stub(S390StAttribState *sa, uint64_t start_gfn,
                                      uint32_t count, uint8_t *values)
 {
     return 0;
 }
 static void qemu_s390_synchronize_stub(S390StAttribState *sa)
 {
 }
 static int qemu_s390_get_stattr_stub(S390StAttribState *sa, uint64_t *start_gfn,
                                      uint32_t count, uint8_t *values)
 {
     return 0;
 }
 static long long qemu_s390_get_dirtycount_stub(S390StAttribState *sa)
 {
     return 0;
 }
 static int qemu_s390_set_migrationmode_stub(S390StAttribState *sa, bool value,
                                             Error **errp)
 {
     return 0;
 }

 static int qemu_s390_get_active(S390StAttribState *sa)
 {
     return sa->migration_enabled;
 }

 static void qemu_s390_stattrib_class_init(ObjectClass *oc, void *data)
 {
     S390StAttribClass *sa_cl = S390_STATTRIB_CLASS(oc);
     DeviceClass *dc = DEVICE_CLASS(oc);

     sa_cl->synchronize = qemu_s390_synchronize_stub;
     sa_cl->get_stattr = qemu_s390_get_stattr_stub;
     sa_cl->set_stattr = qemu_s390_peek_stattr_stub;
     sa_cl->peek_stattr = qemu_s390_peek_stattr_stub;
     sa_cl->set_migrationmode = qemu_s390_set_migrationmode_stub;
     sa_cl->get_dirtycount = qemu_s390_get_dirtycount_stub;
     sa_cl->get_active = qemu_s390_get_active;

     /* Reason: Can only be instantiated one time (internally) */
     dc->user_creatable = false;
 }

 static const TypeInfo qemu_s390_stattrib_info = {
     .name          = TYPE_QEMU_S390_STATTRIB,
     .parent        = TYPE_S390_STATTRIB,
     .instance_init = qemu_s390_stattrib_instance_init,
     .instance_size = sizeof(QEMUS390StAttribState),
     .class_init    = qemu_s390_stattrib_class_init,
     .class_size    = sizeof(S390StAttribClass),
 };

 /* Generic abstract object: */

 static SaveVMHandlers savevm_s390_stattrib_handlers = {
     .save_setup = cmma_save_setup,
     .save_live_iterate = cmma_save_iterate,
     .save_live_complete_precopy = cmma_save_complete,
     .state_pending_exact = cmma_state_pending,
     .state_pending_estimate = cmma_state_pending,
     .save_cleanup = cmma_save_cleanup,
     .load_state = cmma_load,
     .is_active = cmma_active,
 };

 static void s390_stattrib_realize(DeviceState *dev, Error **errp)
 {
     bool ambiguous = false;

     object_resolve_path_type("", TYPE_S390_STATTRIB, &ambiguous);
     if (ambiguous) {
         error_setg(errp, "storage_attributes device already exists");
         return;
     }

     register_savevm_live(TYPE_S390_STATTRIB, 0, 0,
                          &savevm_s390_stattrib_handlers, dev);
 }

 static const Property s390_stattrib_props[] = {
     DEFINE_PROP_BOOL("migration-enabled", S390StAttribState, migration_enabled, true),
     DEFINE_PROP_END_OF_LIST(),
 };

 static void s390_stattrib_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);

     dc->hotpluggable = false;
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     dc->realize = s390_stattrib_realize;
     device_class_set_props(dc, s390_stattrib_props);
 }

 static void s390_stattrib_instance_init(Object *obj)
 {
     S390StAttribState *sas = S390_STATTRIB(obj);

     sas->migration_cur_gfn = 0;
 }

 static const TypeInfo s390_stattrib_info = {
     .name          = TYPE_S390_STATTRIB,
     .parent        = TYPE_DEVICE,
     .instance_init = s390_stattrib_instance_init,
     .instance_size = sizeof(S390StAttribState),
     .class_init    = s390_stattrib_class_init,
     .class_size    = sizeof(S390StAttribClass),
     .abstract      = true,
 };

 static void s390_stattrib_register_types(void)
 {
     type_register_static(&s390_stattrib_info);
     type_register_static(&qemu_s390_stattrib_info);
 }

 type_init(s390_stattrib_register_types)
	/*
	* s390 storage attributes device
	*
	* Copyright 2016 IBM Corp.
	* Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
	*
	* This work is licensed under the terms of the GNU GPL, version 2 or (at
	* your option) any later version. See the COPYING file in the top-level
	* directory.
	*/

	#include "qemu/osdep.h"
	#include "qemu/units.h"
	#include "migration/qemu-file.h"
	#include "migration/register.h"
	#include "hw/qdev-properties.h"
	#include "hw/s390x/storage-attributes.h"
	#include "qemu/error-report.h"
	#include "exec/ram_addr.h"
	#include "qapi/error.h"
	#include "qapi/qmp/qdict.h"
	#include "cpu.h"

	/* 512KiB cover 2GB of guest memory */
	#define CMMA_BLOCK_SIZE (512 * KiB)

	#define STATTR_FLAG_EOS 0x01ULL
	#define STATTR_FLAG_MORE 0x02ULL
	#define STATTR_FLAG_ERROR 0x04ULL
	#define STATTR_FLAG_DONE 0x08ULL

	static S390StAttribState *s390_get_stattrib_device(void)
	{
	S390StAttribState *sas;

	sas = S390_STATTRIB(object_resolve_path_type("", TYPE_S390_STATTRIB, NULL));
	assert(sas);
	return sas;
	}

	void s390_stattrib_init(void)
	{
	Object *obj;

	obj = kvm_s390_stattrib_create();
	if (!obj) {
	obj = object_new(TYPE_QEMU_S390_STATTRIB);
	}

	object_property_add_child(qdev_get_machine(), TYPE_S390_STATTRIB,
	obj);
	object_unref(obj);

	qdev_realize(DEVICE(obj), NULL, &error_fatal);
	}

	/* Console commands: */

	void hmp_migrationmode(Monitor mon, const QDict qdict)
	{
	S390StAttribState *sas = s390_get_stattrib_device();
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	uint64_t what = qdict_get_int(qdict, "mode");
	Error *local_err = NULL;
	int r;

	r = sac->set_migrationmode(sas, what, &local_err);
	if (r < 0) {
	monitor_printf(mon, "Error: %s", error_get_pretty(local_err));
	error_free(local_err);
	}
	}

	void hmp_info_cmma(Monitor mon, const QDict qdict)
	{
	S390StAttribState *sas = s390_get_stattrib_device();
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	uint64_t addr = qdict_get_int(qdict, "addr");
	uint64_t buflen = qdict_get_try_int(qdict, "count", 8);
	uint8_t *vals;
	int cx, len;

	vals = g_try_malloc(buflen);
	if (!vals) {
	monitor_printf(mon, "Error: %s\n", strerror(errno));
	return;
	}

	len = sac->peek_stattr(sas, addr / TARGET_PAGE_SIZE, buflen, vals);
	if (len < 0) {
	monitor_printf(mon, "Error: %s", strerror(-len));
	goto out;
	}

	monitor_printf(mon, " CMMA attributes, "
	"pages %" PRIu64 "+%d (0x%" PRIx64 "):\n",
	addr / TARGET_PAGE_SIZE, len, addr & ~TARGET_PAGE_MASK);
	for (cx = 0; cx < len; cx++) {
	if (cx % 8 == 7) {
	monitor_printf(mon, "%02x\n", vals[cx]);
	} else {
	monitor_printf(mon, "%02x", vals[cx]);
	}
	}
	monitor_printf(mon, "\n");

	out:
	g_free(vals);
	}

	/* Migration support: */

	static int cmma_load(QEMUFile f, void opaque, int version_id)
	{
	S390StAttribState *sas = S390_STATTRIB(opaque);
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	uint64_t count, cur_gfn;
	int flags, ret = 0;
	ram_addr_t addr;
	uint8_t *buf;

	while (!ret) {
	addr = qemu_get_be64(f);
	flags = addr & ~TARGET_PAGE_MASK;
	addr &= TARGET_PAGE_MASK;

	switch (flags) {
	case STATTR_FLAG_MORE: {
	cur_gfn = addr / TARGET_PAGE_SIZE;
	count = qemu_get_be64(f);
	buf = g_try_malloc(count);
	if (!buf) {
	error_report("cmma_load could not allocate memory");
	ret = -ENOMEM;
	break;
	}

	qemu_get_buffer(f, buf, count);
	ret = sac->set_stattr(sas, cur_gfn, count, buf);
	if (ret < 0) {
	error_report("Error %d while setting storage attributes", ret);
	}
	g_free(buf);
	break;
	}
	case STATTR_FLAG_ERROR: {
	error_report("Storage attributes data is incomplete");
	ret = -EINVAL;
	break;
	}
	case STATTR_FLAG_DONE:
	/* This is after the last pre-copied value has been sent, nothing
	* more will be sent after this. Pre-copy has finished, and we
	* are done flushing all the remaining values. Now the target
	* system is about to take over. We synchronize the buffer to
	* apply the actual correct values where needed.
	*/
	sac->synchronize(sas);
	break;
	case STATTR_FLAG_EOS:
	/* Normal exit */
	return 0;
	default:
	error_report("Unexpected storage attribute flag data: %#x", flags);
	ret = -EINVAL;
	}
	}

	return ret;
	}

	static int cmma_save_setup(QEMUFile f, void opaque, Error **errp)
	{
	S390StAttribState *sas = S390_STATTRIB(opaque);
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	int res;
	/*
	* Signal that we want to start a migration, thus needing PGSTE dirty
	* tracking.
	*/
	res = sac->set_migrationmode(sas, true, errp);
	if (res) {
	return res;
	}
	qemu_put_be64(f, STATTR_FLAG_EOS);
	return 0;
	}

	static void cmma_state_pending(void opaque, uint64_t must_precopy,
	uint64_t *can_postcopy)
	{
	S390StAttribState *sas = S390_STATTRIB(opaque);
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	long long res = sac->get_dirtycount(sas);

	if (res >= 0) {
	*must_precopy += res;
	}
	}

	static int cmma_save(QEMUFile f, void opaque, int final)
	{
	S390StAttribState *sas = S390_STATTRIB(opaque);
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	uint8_t *buf;
	int r, cx, reallen = 0, ret = 0;
	uint32_t buflen = CMMA_BLOCK_SIZE;
	uint64_t start_gfn = sas->migration_cur_gfn;

	buf = g_try_malloc(buflen);
	if (!buf) {
	error_report("Could not allocate memory to save storage attributes");
	return -ENOMEM;
	}

	while (final ? 1 : migration_rate_exceeded(f) == 0) {
	reallen = sac->get_stattr(sas, &start_gfn, buflen, buf);
	if (reallen < 0) {
	g_free(buf);
	return reallen;
	}

	ret = 1;
	if (!reallen) {
	break;
	}
	qemu_put_be64(f, (start_gfn << TARGET_PAGE_BITS) \| STATTR_FLAG_MORE);
	qemu_put_be64(f, reallen);
	for (cx = 0; cx < reallen; cx++) {
	qemu_put_byte(f, buf[cx]);
	}
	if (!sac->get_dirtycount(sas)) {
	break;
	}
	}

	sas->migration_cur_gfn = start_gfn + reallen;
	g_free(buf);
	if (final) {
	qemu_put_be64(f, STATTR_FLAG_DONE);
	}
	qemu_put_be64(f, STATTR_FLAG_EOS);

	r = qemu_file_get_error(f);
	if (r < 0) {
	return r;
	}

	return ret;
	}

	static int cmma_save_iterate(QEMUFile f, void opaque)
	{
	return cmma_save(f, opaque, 0);
	}

	static int cmma_save_complete(QEMUFile f, void opaque)
	{
	return cmma_save(f, opaque, 1);
	}

	static void cmma_save_cleanup(void *opaque)
	{
	S390StAttribState *sas = S390_STATTRIB(opaque);
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	sac->set_migrationmode(sas, false, NULL);
	}

	static bool cmma_active(void *opaque)
	{
	S390StAttribState *sas = S390_STATTRIB(opaque);
	S390StAttribClass *sac = S390_STATTRIB_GET_CLASS(sas);
	return sac->get_active(sas);
	}

	/* QEMU object: */

	static void qemu_s390_stattrib_instance_init(Object *obj)
	{
	}

	static int qemu_s390_peek_stattr_stub(S390StAttribState *sa, uint64_t start_gfn,
	uint32_t count, uint8_t *values)
	{
	return 0;
	}
	static void qemu_s390_synchronize_stub(S390StAttribState *sa)
	{
	}
	static int qemu_s390_get_stattr_stub(S390StAttribState sa, uint64_t start_gfn,
	uint32_t count, uint8_t *values)
	{
	return 0;
	}
	static long long qemu_s390_get_dirtycount_stub(S390StAttribState *sa)
	{
	return 0;
	}
	static int qemu_s390_set_migrationmode_stub(S390StAttribState *sa, bool value,
	Error **errp)
	{
	return 0;
	}

	static int qemu_s390_get_active(S390StAttribState *sa)
	{
	return sa->migration_enabled;
	}

	static void qemu_s390_stattrib_class_init(ObjectClass oc, void data)
	{
	S390StAttribClass *sa_cl = S390_STATTRIB_CLASS(oc);
	DeviceClass *dc = DEVICE_CLASS(oc);

	sa_cl->synchronize = qemu_s390_synchronize_stub;
	sa_cl->get_stattr = qemu_s390_get_stattr_stub;
	sa_cl->set_stattr = qemu_s390_peek_stattr_stub;
	sa_cl->peek_stattr = qemu_s390_peek_stattr_stub;
	sa_cl->set_migrationmode = qemu_s390_set_migrationmode_stub;
	sa_cl->get_dirtycount = qemu_s390_get_dirtycount_stub;
	sa_cl->get_active = qemu_s390_get_active;

	/* Reason: Can only be instantiated one time (internally) */
	dc->user_creatable = false;
	}

	static const TypeInfo qemu_s390_stattrib_info = {
	.name = TYPE_QEMU_S390_STATTRIB,
	.parent = TYPE_S390_STATTRIB,
	.instance_init = qemu_s390_stattrib_instance_init,
	.instance_size = sizeof(QEMUS390StAttribState),
	.class_init = qemu_s390_stattrib_class_init,
	.class_size = sizeof(S390StAttribClass),
	};

	/* Generic abstract object: */

	static SaveVMHandlers savevm_s390_stattrib_handlers = {
	.save_setup = cmma_save_setup,
	.save_live_iterate = cmma_save_iterate,
	.save_live_complete_precopy = cmma_save_complete,
	.state_pending_exact = cmma_state_pending,
	.state_pending_estimate = cmma_state_pending,
	.save_cleanup = cmma_save_cleanup,
	.load_state = cmma_load,
	.is_active = cmma_active,
	};

	static void s390_stattrib_realize(DeviceState dev, Error *errp)
	{
	bool ambiguous = false;

	object_resolve_path_type("", TYPE_S390_STATTRIB, &ambiguous);
	if (ambiguous) {
	error_setg(errp, "storage_attributes device already exists");
	return;
	}

	register_savevm_live(TYPE_S390_STATTRIB, 0, 0,
	&savevm_s390_stattrib_handlers, dev);
	}

	static const Property s390_stattrib_props[] = {
	DEFINE_PROP_BOOL("migration-enabled", S390StAttribState, migration_enabled, true),
	DEFINE_PROP_END_OF_LIST(),
	};

	static void s390_stattrib_class_init(ObjectClass oc, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(oc);

	dc->hotpluggable = false;
	set_bit(DEVICE_CATEGORY_MISC, dc->categories);
	dc->realize = s390_stattrib_realize;
	device_class_set_props(dc, s390_stattrib_props);
	}

	static void s390_stattrib_instance_init(Object *obj)
	{
	S390StAttribState *sas = S390_STATTRIB(obj);

	sas->migration_cur_gfn = 0;
	}

	static const TypeInfo s390_stattrib_info = {
	.name = TYPE_S390_STATTRIB,
	.parent = TYPE_DEVICE,
	.instance_init = s390_stattrib_instance_init,
	.instance_size = sizeof(S390StAttribState),
	.class_init = s390_stattrib_class_init,
	.class_size = sizeof(S390StAttribClass),
	.abstract = true,
	};

	static void s390_stattrib_register_types(void)
	{
	type_register_static(&s390_stattrib_info);
	type_register_static(&qemu_s390_stattrib_info);
	}

	type_init(s390_stattrib_register_types)