[mirror_qemu.git] / hw / s390x / s390-skeys.c

/*
 * s390 storage key device
 *
 * Copyright 2015 IBM Corp.
 * Author(s): Jason J. Herne <jjherne@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 "hw/boards.h"
#include "qmp-commands.h"
#include "migration/qemu-file.h"
#include "hw/s390x/storage-keys.h"
#include "qemu/error-report.h"

#define S390_SKEYS_BUFFER_SIZE 131072  /* Room for 128k storage keys */
#define S390_SKEYS_SAVE_FLAG_EOS 0x01
#define S390_SKEYS_SAVE_FLAG_SKEYS 0x02
#define S390_SKEYS_SAVE_FLAG_ERROR 0x04

S390SKeysState *s390_get_skeys_device(void)
{
    S390SKeysState *ss;

    ss = S390_SKEYS(object_resolve_path_type("", TYPE_S390_SKEYS, NULL));
    assert(ss);
    return ss;
}

void s390_skeys_init(void)
{
    Object *obj;

    if (kvm_enabled()) {
        obj = object_new(TYPE_KVM_S390_SKEYS);
    } else {
        obj = object_new(TYPE_QEMU_S390_SKEYS);
    }
    object_property_add_child(qdev_get_machine(), TYPE_S390_SKEYS,
                              obj, NULL);
    object_unref(obj);

    qdev_init_nofail(DEVICE(obj));
}

static void write_keys(QEMUFile *f, uint8_t *keys, uint64_t startgfn,
                       uint64_t count, Error **errp)
{
    uint64_t curpage = startgfn;
    uint64_t maxpage = curpage + count - 1;
    const char *fmt = "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
                      " ch=%d, reserved=%d\n";
    char buf[128];
    int len;

    for (; curpage <= maxpage; curpage++) {
        uint8_t acc = (*keys & 0xF0) >> 4;
        int fp =  (*keys & 0x08);
        int ref = (*keys & 0x04);
        int ch = (*keys & 0x02);
        int res = (*keys & 0x01);

        len = snprintf(buf, sizeof(buf), fmt, curpage,
                       *keys, acc, fp, ref, ch, res);
        assert(len < sizeof(buf));
        qemu_put_buffer(f, (uint8_t *)buf, len);
        keys++;
    }
}

void hmp_info_skeys(Monitor *mon, const QDict *qdict)
{
    S390SKeysState *ss = s390_get_skeys_device();
    S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
    uint64_t addr = qdict_get_int(qdict, "addr");
    uint8_t key;
    int r;

    /* Quick check to see if guest is using storage keys*/
    if (!skeyclass->skeys_enabled(ss)) {
        monitor_printf(mon, "Error: This guest is not using storage keys\n");
        return;
    }

    r = skeyclass->get_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key);
    if (r < 0) {
        monitor_printf(mon, "Error: %s\n", strerror(-r));
        return;
    }

    monitor_printf(mon, "  key: 0x%X\n", key);
}

void hmp_dump_skeys(Monitor *mon, const QDict *qdict)
{
    const char *filename = qdict_get_str(qdict, "filename");
    Error *err = NULL;

    qmp_dump_skeys(filename, &err);
    if (err) {
        error_report_err(err);
    }
}

void qmp_dump_skeys(const char *filename, Error **errp)
{
    S390SKeysState *ss = s390_get_skeys_device();
    S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
    const uint64_t total_count = ram_size / TARGET_PAGE_SIZE;
    uint64_t handled_count = 0, cur_count;
    Error *lerr = NULL;
    vaddr cur_gfn = 0;
    uint8_t *buf;
    int ret;
    QEMUFile *f;

    /* Quick check to see if guest is using storage keys*/
    if (!skeyclass->skeys_enabled(ss)) {
        error_setg(errp, "This guest is not using storage keys - "
                         "nothing to dump");
        return;
    }

    f = qemu_fopen(filename, "wb");
    if (!f) {
        error_setg_file_open(errp, errno, filename);
        return;
    }

    buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
    if (!buf) {
        error_setg(errp, "Could not allocate memory");
        goto out;
    }

    /* we'll only dump initial memory for now */
    while (handled_count < total_count) {
        /* Calculate how many keys to ask for & handle overflow case */
        cur_count = MIN(total_count - handled_count, S390_SKEYS_BUFFER_SIZE);

        ret = skeyclass->get_skeys(ss, cur_gfn, cur_count, buf);
        if (ret < 0) {
            error_setg(errp, "get_keys error %d", ret);
            goto out_free;
        }

        /* write keys to stream */
        write_keys(f, buf, cur_gfn, cur_count, &lerr);
        if (lerr) {
            goto out_free;
        }

        cur_gfn += cur_count;
        handled_count += cur_count;
    }

out_free:
    error_propagate(errp, lerr);
    g_free(buf);
out:
    qemu_fclose(f);
}

static void qemu_s390_skeys_init(Object *obj)
{
    QEMUS390SKeysState *skeys = QEMU_S390_SKEYS(obj);
    MachineState *machine = MACHINE(qdev_get_machine());

    skeys->key_count = machine->maxram_size / TARGET_PAGE_SIZE;
    skeys->keydata = g_malloc0(skeys->key_count);
}

static int qemu_s390_skeys_enabled(S390SKeysState *ss)
{
    return 1;
}

/*
 * TODO: for memory hotplug support qemu_s390_skeys_set and qemu_s390_skeys_get
 * will have to make sure that the given gfn belongs to a memory region and not
 * a memory hole.
 */
static int qemu_s390_skeys_set(S390SKeysState *ss, uint64_t start_gfn,
                              uint64_t count, uint8_t *keys)
{
    QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
    int i;

    /* Check for uint64 overflow and access beyond end of key data */
    if (start_gfn + count > skeydev->key_count || start_gfn + count < count) {
        error_report("Error: Setting storage keys for page beyond the end "
                     "of memory: gfn=%" PRIx64 " count=%" PRId64,
                     start_gfn, count);
        return -EINVAL;
    }

    for (i = 0; i < count; i++) {
        skeydev->keydata[start_gfn + i] = keys[i];
    }
    return 0;
}

static int qemu_s390_skeys_get(S390SKeysState *ss, uint64_t start_gfn,
                               uint64_t count, uint8_t *keys)
{
    QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
    int i;

    /* Check for uint64 overflow and access beyond end of key data */
    if (start_gfn + count > skeydev->key_count || start_gfn + count < count) {
        error_report("Error: Getting storage keys for page beyond the end "
                     "of memory: gfn=%" PRIx64 " count=%" PRId64,
                     start_gfn, count);
        return -EINVAL;
    }

    for (i = 0; i < count; i++) {
        keys[i] = skeydev->keydata[start_gfn + i];
    }
    return 0;
}

static void qemu_s390_skeys_class_init(ObjectClass *oc, void *data)
{
    S390SKeysClass *skeyclass = S390_SKEYS_CLASS(oc);

    skeyclass->skeys_enabled = qemu_s390_skeys_enabled;
    skeyclass->get_skeys = qemu_s390_skeys_get;
    skeyclass->set_skeys = qemu_s390_skeys_set;
}

static const TypeInfo qemu_s390_skeys_info = {
    .name          = TYPE_QEMU_S390_SKEYS,
    .parent        = TYPE_S390_SKEYS,
    .instance_init = qemu_s390_skeys_init,
    .instance_size = sizeof(QEMUS390SKeysState),
    .class_init    = qemu_s390_skeys_class_init,
    .class_size    = sizeof(S390SKeysClass),
};

static void s390_storage_keys_save(QEMUFile *f, void *opaque)
{
    S390SKeysState *ss = S390_SKEYS(opaque);
    S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
    uint64_t pages_left = ram_size / TARGET_PAGE_SIZE;
    uint64_t read_count, eos = S390_SKEYS_SAVE_FLAG_EOS;
    vaddr cur_gfn = 0;
    int error = 0;
    uint8_t *buf;

    if (!skeyclass->skeys_enabled(ss)) {
        goto end_stream;
    }

    buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
    if (!buf) {
        error_report("storage key save could not allocate memory");
        goto end_stream;
    }

    /* We only support initial memory. Standby memory is not handled yet. */
    qemu_put_be64(f, (cur_gfn * TARGET_PAGE_SIZE) | S390_SKEYS_SAVE_FLAG_SKEYS);
    qemu_put_be64(f, pages_left);

    while (pages_left) {
        read_count = MIN(pages_left, S390_SKEYS_BUFFER_SIZE);

        if (!error) {
            error = skeyclass->get_skeys(ss, cur_gfn, read_count, buf);
            if (error) {
                /*
                 * If error: we want to fill the stream with valid data instead
                 * of stopping early so we pad the stream with 0x00 values and
                 * use S390_SKEYS_SAVE_FLAG_ERROR to indicate failure to the
                 * reading side.
                 */
                error_report("S390_GET_KEYS error %d", error);
                memset(buf, 0, S390_SKEYS_BUFFER_SIZE);
                eos = S390_SKEYS_SAVE_FLAG_ERROR;
            }
        }

        qemu_put_buffer(f, buf, read_count);
        cur_gfn += read_count;
        pages_left -= read_count;
    }

    g_free(buf);
end_stream:
    qemu_put_be64(f, eos);
}

static int s390_storage_keys_load(QEMUFile *f, void *opaque, int version_id)
{
    S390SKeysState *ss = S390_SKEYS(opaque);
    S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
    int ret = 0;

    while (!ret) {
        ram_addr_t addr;
        int flags;

        addr = qemu_get_be64(f);
        flags = addr & ~TARGET_PAGE_MASK;
        addr &= TARGET_PAGE_MASK;

        switch (flags) {
        case S390_SKEYS_SAVE_FLAG_SKEYS: {
            const uint64_t total_count = qemu_get_be64(f);
            uint64_t handled_count = 0, cur_count;
            uint64_t cur_gfn = addr / TARGET_PAGE_SIZE;
            uint8_t *buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);

            if (!buf) {
                error_report("storage key load could not allocate memory");
                ret = -ENOMEM;
                break;
            }

            while (handled_count < total_count) {
                cur_count = MIN(total_count - handled_count,
                                S390_SKEYS_BUFFER_SIZE);
                qemu_get_buffer(f, buf, cur_count);

                ret = skeyclass->set_skeys(ss, cur_gfn, cur_count, buf);
                if (ret < 0) {
                    error_report("S390_SET_KEYS error %d", ret);
                    break;
                }
                handled_count += cur_count;
                cur_gfn += cur_count;
            }
            g_free(buf);
            break;
        }
        case S390_SKEYS_SAVE_FLAG_ERROR: {
            error_report("Storage key data is incomplete");
            ret = -EINVAL;
            break;
        }
        case S390_SKEYS_SAVE_FLAG_EOS:
            /* normal exit */
            return 0;
        default:
            error_report("Unexpected storage key flag data: %#x", flags);
            ret = -EINVAL;
        }
    }

    return ret;
}

static inline bool s390_skeys_get_migration_enabled(Object *obj, Error **errp)
{
    S390SKeysState *ss = S390_SKEYS(obj);

    return ss->migration_enabled;
}

static inline void s390_skeys_set_migration_enabled(Object *obj, bool value,
                                            Error **errp)
{
    S390SKeysState *ss = S390_SKEYS(obj);

    /* Prevent double registration of savevm handler */
    if (ss->migration_enabled == value) {
        return;
    }

    ss->migration_enabled = value;

    if (ss->migration_enabled) {
        register_savevm(NULL, TYPE_S390_SKEYS, 0, 1, s390_storage_keys_save,
                        s390_storage_keys_load, ss);
    } else {
        unregister_savevm(DEVICE(ss), TYPE_S390_SKEYS, ss);
    }
}

static void s390_skeys_instance_init(Object *obj)
{
    object_property_add_bool(obj, "migration-enabled",
                             s390_skeys_get_migration_enabled,
                             s390_skeys_set_migration_enabled, NULL);
    object_property_set_bool(obj, true, "migration-enabled", NULL);
}

static void s390_skeys_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);

    dc->hotpluggable = false;
    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
}

static const TypeInfo s390_skeys_info = {
    .name          = TYPE_S390_SKEYS,
    .parent        = TYPE_DEVICE,
    .instance_init = s390_skeys_instance_init,
    .instance_size = sizeof(S390SKeysState),
    .class_init    = s390_skeys_class_init,
    .class_size    = sizeof(S390SKeysClass),
    .abstract = true,
};

static void qemu_s390_skeys_register_types(void)
{
    type_register_static(&s390_skeys_info);
    type_register_static(&qemu_s390_skeys_info);
}

type_init(qemu_s390_skeys_register_types)
Commit	Line	Data
0efe406c JH	1	/*
	2	* s390 storage key device
	3	*
	4	* Copyright 2015 IBM Corp.
	5	* Author(s): Jason J. Herne <jjherne@linux.vnet.ibm.com>
	6	*
	7	* This work is licensed under the terms of the GNU GPL, version 2 or (at
	8	* your option) any later version. See the COPYING file in the top-level
	9	* directory.
	10	*/
	11
9615495a	12	#include "qemu/osdep.h"
0efe406c	13	#include "hw/boards.h"
7ee0c3e3	14	#include "qmp-commands.h"
186208fa	15	#include "migration/qemu-file.h"
0efe406c JH	16	#include "hw/s390x/storage-keys.h"
	17	#include "qemu/error-report.h"
	18
7ee0c3e3	19	#define S390_SKEYS_BUFFER_SIZE 131072 /* Room for 128k storage keys */
186208fa JH	20	#define S390_SKEYS_SAVE_FLAG_EOS 0x01
	21	#define S390_SKEYS_SAVE_FLAG_SKEYS 0x02
	22	#define S390_SKEYS_SAVE_FLAG_ERROR 0x04
7ee0c3e3	23
0efe406c JH	24	S390SKeysState *s390_get_skeys_device(void)
	25	{
	26	S390SKeysState *ss;
	27
	28	ss = S390_SKEYS(object_resolve_path_type("", TYPE_S390_SKEYS, NULL));
	29	assert(ss);
	30	return ss;
	31	}
	32
	33	void s390_skeys_init(void)
	34	{
	35	Object *obj;
	36
	37	if (kvm_enabled()) {
	38	obj = object_new(TYPE_KVM_S390_SKEYS);
	39	} else {
	40	obj = object_new(TYPE_QEMU_S390_SKEYS);
	41	}
	42	object_property_add_child(qdev_get_machine(), TYPE_S390_SKEYS,
	43	obj, NULL);
	44	object_unref(obj);
	45
	46	qdev_init_nofail(DEVICE(obj));
	47	}
	48
7ee0c3e3 JH	49	static void write_keys(QEMUFile f, uint8_t keys, uint64_t startgfn,
	50	uint64_t count, Error **errp)
	51	{
	52	uint64_t curpage = startgfn;
	53	uint64_t maxpage = curpage + count - 1;
	54	const char *fmt = "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
	55	" ch=%d, reserved=%d\n";
	56	char buf[128];
	57	int len;
	58
	59	for (; curpage <= maxpage; curpage++) {
	60	uint8_t acc = (*keys & 0xF0) >> 4;
	61	int fp = (*keys & 0x08);
	62	int ref = (*keys & 0x04);
	63	int ch = (*keys & 0x02);
	64	int res = (*keys & 0x01);
	65
	66	len = snprintf(buf, sizeof(buf), fmt, curpage,
	67	*keys, acc, fp, ref, ch, res);
	68	assert(len < sizeof(buf));
	69	qemu_put_buffer(f, (uint8_t *)buf, len);
	70	keys++;
	71	}
	72	}
	73
a08f0081 JH	74	void hmp_info_skeys(Monitor mon, const QDict qdict)
	75	{
	76	S390SKeysState *ss = s390_get_skeys_device();
	77	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	78	uint64_t addr = qdict_get_int(qdict, "addr");
	79	uint8_t key;
	80	int r;
	81
	82	/* Quick check to see if guest is using storage keys*/
	83	if (!skeyclass->skeys_enabled(ss)) {
	84	monitor_printf(mon, "Error: This guest is not using storage keys\n");
	85	return;
	86	}
	87
	88	r = skeyclass->get_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key);
	89	if (r < 0) {
	90	monitor_printf(mon, "Error: %s\n", strerror(-r));
	91	return;
	92	}
	93
	94	monitor_printf(mon, " key: 0x%X\n", key);
	95	}
	96
a4538a5c JH	97	void hmp_dump_skeys(Monitor mon, const QDict qdict)
	98	{
	99	const char *filename = qdict_get_str(qdict, "filename");
	100	Error *err = NULL;
	101
	102	qmp_dump_skeys(filename, &err);
	103	if (err) {
193227f9	104	error_report_err(err);
a4538a5c JH	105	}
	106	}
	107
7ee0c3e3 JH	108	void qmp_dump_skeys(const char filename, Error *errp)
	109	{
	110	S390SKeysState *ss = s390_get_skeys_device();
	111	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	112	const uint64_t total_count = ram_size / TARGET_PAGE_SIZE;
	113	uint64_t handled_count = 0, cur_count;
	114	Error *lerr = NULL;
	115	vaddr cur_gfn = 0;
	116	uint8_t *buf;
	117	int ret;
	118	QEMUFile *f;
	119
	120	/* Quick check to see if guest is using storage keys*/
	121	if (!skeyclass->skeys_enabled(ss)) {
	122	error_setg(errp, "This guest is not using storage keys - "
	123	"nothing to dump");
	124	return;
	125	}
	126
	127	f = qemu_fopen(filename, "wb");
	128	if (!f) {
	129	error_setg_file_open(errp, errno, filename);
	130	return;
	131	}
	132
	133	buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
	134	if (!buf) {
	135	error_setg(errp, "Could not allocate memory");
	136	goto out;
	137	}
	138
	139	/* we'll only dump initial memory for now */
	140	while (handled_count < total_count) {
	141	/* Calculate how many keys to ask for & handle overflow case */
	142	cur_count = MIN(total_count - handled_count, S390_SKEYS_BUFFER_SIZE);
	143
	144	ret = skeyclass->get_skeys(ss, cur_gfn, cur_count, buf);
	145	if (ret < 0) {
	146	error_setg(errp, "get_keys error %d", ret);
	147	goto out_free;
	148	}
	149
	150	/* write keys to stream */
	151	write_keys(f, buf, cur_gfn, cur_count, &lerr);
	152	if (lerr) {
	153	goto out_free;
	154	}
	155
	156	cur_gfn += cur_count;
	157	handled_count += cur_count;
	158	}
	159
	160	out_free:
	161	error_propagate(errp, lerr);
	162	g_free(buf);
	163	out:
	164	qemu_fclose(f);
	165	}
	166
0efe406c JH	167	static void qemu_s390_skeys_init(Object *obj)
	168	{
	169	QEMUS390SKeysState *skeys = QEMU_S390_SKEYS(obj);
	170	MachineState *machine = MACHINE(qdev_get_machine());
	171
	172	skeys->key_count = machine->maxram_size / TARGET_PAGE_SIZE;
	173	skeys->keydata = g_malloc0(skeys->key_count);
	174	}
	175
	176	static int qemu_s390_skeys_enabled(S390SKeysState *ss)
	177	{
	178	return 1;
	179	}
	180
	181	/*
	182	* TODO: for memory hotplug support qemu_s390_skeys_set and qemu_s390_skeys_get
	183	* will have to make sure that the given gfn belongs to a memory region and not
	184	* a memory hole.
	185	*/
	186	static int qemu_s390_skeys_set(S390SKeysState *ss, uint64_t start_gfn,
	187	uint64_t count, uint8_t *keys)
	188	{
	189	QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
	190	int i;
	191
	192	/* Check for uint64 overflow and access beyond end of key data */
	193	if (start_gfn + count > skeydev->key_count \|\| start_gfn + count < count) {
	194	error_report("Error: Setting storage keys for page beyond the end "
9af9e0fe MA	195	"of memory: gfn=%" PRIx64 " count=%" PRId64,
9af9e0fe MA	196	start_gfn, count);
0efe406c JH	197	return -EINVAL;
	198	}
	199
	200	for (i = 0; i < count; i++) {
	201	skeydev->keydata[start_gfn + i] = keys[i];
	202	}
	203	return 0;
	204	}
	205
	206	static int qemu_s390_skeys_get(S390SKeysState *ss, uint64_t start_gfn,
	207	uint64_t count, uint8_t *keys)
	208	{
	209	QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
	210	int i;
	211
	212	/* Check for uint64 overflow and access beyond end of key data */
	213	if (start_gfn + count > skeydev->key_count \|\| start_gfn + count < count) {
	214	error_report("Error: Getting storage keys for page beyond the end "
9af9e0fe MA	215	"of memory: gfn=%" PRIx64 " count=%" PRId64,
9af9e0fe MA	216	start_gfn, count);
0efe406c JH	217	return -EINVAL;
	218	}
	219
	220	for (i = 0; i < count; i++) {
	221	keys[i] = skeydev->keydata[start_gfn + i];
	222	}
	223	return 0;
	224	}
	225
	226	static void qemu_s390_skeys_class_init(ObjectClass oc, void data)
	227	{
	228	S390SKeysClass *skeyclass = S390_SKEYS_CLASS(oc);
	229
	230	skeyclass->skeys_enabled = qemu_s390_skeys_enabled;
	231	skeyclass->get_skeys = qemu_s390_skeys_get;
	232	skeyclass->set_skeys = qemu_s390_skeys_set;
	233	}
	234
	235	static const TypeInfo qemu_s390_skeys_info = {
	236	.name = TYPE_QEMU_S390_SKEYS,
	237	.parent = TYPE_S390_SKEYS,
	238	.instance_init = qemu_s390_skeys_init,
	239	.instance_size = sizeof(QEMUS390SKeysState),
	240	.class_init = qemu_s390_skeys_class_init,
2f2b0c66	241	.class_size = sizeof(S390SKeysClass),
0efe406c JH	242	};
0efe406c JH	243
186208fa JH	244	static void s390_storage_keys_save(QEMUFile f, void opaque)
	245	{
	246	S390SKeysState *ss = S390_SKEYS(opaque);
	247	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	248	uint64_t pages_left = ram_size / TARGET_PAGE_SIZE;
	249	uint64_t read_count, eos = S390_SKEYS_SAVE_FLAG_EOS;
	250	vaddr cur_gfn = 0;
	251	int error = 0;
	252	uint8_t *buf;
	253
	254	if (!skeyclass->skeys_enabled(ss)) {
	255	goto end_stream;
	256	}
	257
	258	buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
	259	if (!buf) {
9af9e0fe	260	error_report("storage key save could not allocate memory");
186208fa JH	261	goto end_stream;
	262	}
	263
	264	/* We only support initial memory. Standby memory is not handled yet. */
	265	qemu_put_be64(f, (cur_gfn * TARGET_PAGE_SIZE) \| S390_SKEYS_SAVE_FLAG_SKEYS);
	266	qemu_put_be64(f, pages_left);
	267
	268	while (pages_left) {
	269	read_count = MIN(pages_left, S390_SKEYS_BUFFER_SIZE);
	270
	271	if (!error) {
	272	error = skeyclass->get_skeys(ss, cur_gfn, read_count, buf);
	273	if (error) {
	274	/*
	275	* If error: we want to fill the stream with valid data instead
	276	* of stopping early so we pad the stream with 0x00 values and
	277	* use S390_SKEYS_SAVE_FLAG_ERROR to indicate failure to the
	278	* reading side.
	279	*/
9af9e0fe	280	error_report("S390_GET_KEYS error %d", error);
186208fa JH	281	memset(buf, 0, S390_SKEYS_BUFFER_SIZE);
	282	eos = S390_SKEYS_SAVE_FLAG_ERROR;
	283	}
	284	}
	285
	286	qemu_put_buffer(f, buf, read_count);
	287	cur_gfn += read_count;
	288	pages_left -= read_count;
	289	}
	290
	291	g_free(buf);
	292	end_stream:
	293	qemu_put_be64(f, eos);
	294	}
	295
	296	static int s390_storage_keys_load(QEMUFile f, void opaque, int version_id)
	297	{
	298	S390SKeysState *ss = S390_SKEYS(opaque);
	299	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	300	int ret = 0;
	301
	302	while (!ret) {
	303	ram_addr_t addr;
	304	int flags;
	305
	306	addr = qemu_get_be64(f);
	307	flags = addr & ~TARGET_PAGE_MASK;
	308	addr &= TARGET_PAGE_MASK;
	309
	310	switch (flags) {
	311	case S390_SKEYS_SAVE_FLAG_SKEYS: {
	312	const uint64_t total_count = qemu_get_be64(f);
	313	uint64_t handled_count = 0, cur_count;
	314	uint64_t cur_gfn = addr / TARGET_PAGE_SIZE;
	315	uint8_t *buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
	316
	317	if (!buf) {
9af9e0fe	318	error_report("storage key load could not allocate memory");
186208fa JH	319	ret = -ENOMEM;
	320	break;
	321	}
	322
	323	while (handled_count < total_count) {
	324	cur_count = MIN(total_count - handled_count,
	325	S390_SKEYS_BUFFER_SIZE);
	326	qemu_get_buffer(f, buf, cur_count);
	327
	328	ret = skeyclass->set_skeys(ss, cur_gfn, cur_count, buf);
	329	if (ret < 0) {
9af9e0fe	330	error_report("S390_SET_KEYS error %d", ret);
186208fa JH	331	break;
	332	}
	333	handled_count += cur_count;
	334	cur_gfn += cur_count;
	335	}
	336	g_free(buf);
	337	break;
	338	}
	339	case S390_SKEYS_SAVE_FLAG_ERROR: {
	340	error_report("Storage key data is incomplete");
	341	ret = -EINVAL;
	342	break;
	343	}
	344	case S390_SKEYS_SAVE_FLAG_EOS:
	345	/* normal exit */
	346	return 0;
	347	default:
	348	error_report("Unexpected storage key flag data: %#x", flags);
	349	ret = -EINVAL;
	350	}
	351	}
	352
	353	return ret;
	354	}
	355
9ef40173 JH	356	static inline bool s390_skeys_get_migration_enabled(Object obj, Error *errp)
	357	{
	358	S390SKeysState *ss = S390_SKEYS(obj);
	359
	360	return ss->migration_enabled;
	361	}
	362
	363	static inline void s390_skeys_set_migration_enabled(Object *obj, bool value,
	364	Error **errp)
186208fa JH	365	{
	366	S390SKeysState *ss = S390_SKEYS(obj);
	367
9ef40173 JH	368	/* Prevent double registration of savevm handler */
	369	if (ss->migration_enabled == value) {
	370	return;
	371	}
	372
	373	ss->migration_enabled = value;
	374
	375	if (ss->migration_enabled) {
	376	register_savevm(NULL, TYPE_S390_SKEYS, 0, 1, s390_storage_keys_save,
	377	s390_storage_keys_load, ss);
	378	} else {
	379	unregister_savevm(DEVICE(ss), TYPE_S390_SKEYS, ss);
	380	}
	381	}
	382
	383	static void s390_skeys_instance_init(Object *obj)
	384	{
	385	object_property_add_bool(obj, "migration-enabled",
	386	s390_skeys_get_migration_enabled,
	387	s390_skeys_set_migration_enabled, NULL);
	388	object_property_set_bool(obj, true, "migration-enabled", NULL);
186208fa JH	389	}
186208fa JH	390
0efe406c JH	391	static void s390_skeys_class_init(ObjectClass oc, void data)
	392	{
	393	DeviceClass *dc = DEVICE_CLASS(oc);
	394
	395	dc->hotpluggable = false;
	396	set_bit(DEVICE_CATEGORY_MISC, dc->categories);
	397	}
	398
	399	static const TypeInfo s390_skeys_info = {
	400	.name = TYPE_S390_SKEYS,
	401	.parent = TYPE_DEVICE,
186208fa	402	.instance_init = s390_skeys_instance_init,
0efe406c JH	403	.instance_size = sizeof(S390SKeysState),
	404	.class_init = s390_skeys_class_init,
	405	.class_size = sizeof(S390SKeysClass),
	406	.abstract = true,
	407	};
	408
	409	static void qemu_s390_skeys_register_types(void)
	410	{
	411	type_register_static(&s390_skeys_info);
	412	type_register_static(&qemu_s390_skeys_info);
	413	}
	414
	415	type_init(qemu_s390_skeys_register_types)