[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 "hw/s390x/storage-keys.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-misc.h"
#include "qapi/qmp/qdict.h"
#include "qemu/error-report.h"
#include "sysemu/kvm.h"
#include "migration/register.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(FILE *f, uint8_t *keys, uint64_t startgfn,
                       uint64_t count, Error **errp)
{
    uint64_t curpage = startgfn;
    uint64_t maxpage = curpage + count - 1;

    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);

        fprintf(f, "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
                " ch=%d, reserved=%d\n",
                curpage, *keys, acc, fp, ref, ch, res);
        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;
    int fd;
    FILE *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;
    }

    fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0600);
    if (fd < 0) {
        error_setg_file_open(errp, errno, filename);
        return;
    }
    f = fdopen(fd, "wb");
    if (!f) {
        close(fd);
        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:
    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);
    DeviceClass *dc = DEVICE_CLASS(oc);

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

    /* Reason: Internal device (only one skeys device for the whole memory) */
    dc->user_creatable = false;
}

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 SaveVMHandlers savevm_s390_storage_keys = {
    .save_state = s390_storage_keys_save,
    .load_state = s390_storage_keys_load,
};

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_live(NULL, TYPE_S390_SKEYS, 0, 1,
                             &savevm_s390_storage_keys, 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 JH	13	#include "hw/boards.h"
0efe406c JH	14	#include "hw/s390x/storage-keys.h"
e688df6b	15	#include "qapi/error.h"
112ed241	16	#include "qapi/qapi-commands-misc.h"
452fcdbc	17	#include "qapi/qmp/qdict.h"
0efe406c	18	#include "qemu/error-report.h"
bd3f16ac	19	#include "sysemu/kvm.h"
f2a8f0a6	20	#include "migration/register.h"
0efe406c	21
7ee0c3e3	22	#define S390_SKEYS_BUFFER_SIZE 131072 /* Room for 128k storage keys */
186208fa JH	23	#define S390_SKEYS_SAVE_FLAG_EOS 0x01
	24	#define S390_SKEYS_SAVE_FLAG_SKEYS 0x02
	25	#define S390_SKEYS_SAVE_FLAG_ERROR 0x04
7ee0c3e3	26
0efe406c JH	27	S390SKeysState *s390_get_skeys_device(void)
	28	{
	29	S390SKeysState *ss;
	30
	31	ss = S390_SKEYS(object_resolve_path_type("", TYPE_S390_SKEYS, NULL));
	32	assert(ss);
	33	return ss;
	34	}
	35
	36	void s390_skeys_init(void)
	37	{
	38	Object *obj;
	39
	40	if (kvm_enabled()) {
	41	obj = object_new(TYPE_KVM_S390_SKEYS);
	42	} else {
	43	obj = object_new(TYPE_QEMU_S390_SKEYS);
	44	}
	45	object_property_add_child(qdev_get_machine(), TYPE_S390_SKEYS,
	46	obj, NULL);
	47	object_unref(obj);
	48
	49	qdev_init_nofail(DEVICE(obj));
	50	}
	51
1fd791f0	52	static void write_keys(FILE f, uint8_t keys, uint64_t startgfn,
7ee0c3e3 JH	53	uint64_t count, Error **errp)
	54	{
	55	uint64_t curpage = startgfn;
	56	uint64_t maxpage = curpage + count - 1;
7ee0c3e3 JH	57
	58	for (; curpage <= maxpage; curpage++) {
	59	uint8_t acc = (*keys & 0xF0) >> 4;
	60	int fp = (*keys & 0x08);
	61	int ref = (*keys & 0x04);
	62	int ch = (*keys & 0x02);
	63	int res = (*keys & 0x01);
	64
1fd791f0 DB	65	fprintf(f, "page=%03" PRIx64 ": key(%d) => ACC=%X, FP=%d, REF=%d,"
	66	" ch=%d, reserved=%d\n",
	67	curpage, *keys, acc, fp, ref, ch, res);
7ee0c3e3 JH	68	keys++;
	69	}
	70	}
	71
a08f0081 JH	72	void hmp_info_skeys(Monitor mon, const QDict qdict)
	73	{
	74	S390SKeysState *ss = s390_get_skeys_device();
	75	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	76	uint64_t addr = qdict_get_int(qdict, "addr");
	77	uint8_t key;
	78	int r;
	79
	80	/* Quick check to see if guest is using storage keys*/
	81	if (!skeyclass->skeys_enabled(ss)) {
	82	monitor_printf(mon, "Error: This guest is not using storage keys\n");
	83	return;
	84	}
	85
	86	r = skeyclass->get_skeys(ss, addr / TARGET_PAGE_SIZE, 1, &key);
	87	if (r < 0) {
	88	monitor_printf(mon, "Error: %s\n", strerror(-r));
	89	return;
	90	}
	91
	92	monitor_printf(mon, " key: 0x%X\n", key);
	93	}
	94
a4538a5c JH	95	void hmp_dump_skeys(Monitor mon, const QDict qdict)
	96	{
	97	const char *filename = qdict_get_str(qdict, "filename");
	98	Error *err = NULL;
	99
	100	qmp_dump_skeys(filename, &err);
	101	if (err) {
193227f9	102	error_report_err(err);
a4538a5c JH	103	}
	104	}
	105
7ee0c3e3 JH	106	void qmp_dump_skeys(const char filename, Error *errp)
	107	{
	108	S390SKeysState *ss = s390_get_skeys_device();
	109	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	110	const uint64_t total_count = ram_size / TARGET_PAGE_SIZE;
	111	uint64_t handled_count = 0, cur_count;
	112	Error *lerr = NULL;
	113	vaddr cur_gfn = 0;
	114	uint8_t *buf;
	115	int ret;
1fd791f0 DB	116	int fd;
1fd791f0 DB	117	FILE *f;
7ee0c3e3 JH	118
	119	/* Quick check to see if guest is using storage keys*/
	120	if (!skeyclass->skeys_enabled(ss)) {
	121	error_setg(errp, "This guest is not using storage keys - "
	122	"nothing to dump");
	123	return;
	124	}
	125
1fd791f0 DB	126	fd = qemu_open(filename, O_WRONLY \| O_CREAT \| O_TRUNC, 0600);
	127	if (fd < 0) {
	128	error_setg_file_open(errp, errno, filename);
	129	return;
	130	}
	131	f = fdopen(fd, "wb");
7ee0c3e3	132	if (!f) {
1fd791f0	133	close(fd);
7ee0c3e3 JH	134	error_setg_file_open(errp, errno, filename);
	135	return;
	136	}
	137
	138	buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
	139	if (!buf) {
	140	error_setg(errp, "Could not allocate memory");
	141	goto out;
	142	}
	143
	144	/* we'll only dump initial memory for now */
	145	while (handled_count < total_count) {
	146	/* Calculate how many keys to ask for & handle overflow case */
	147	cur_count = MIN(total_count - handled_count, S390_SKEYS_BUFFER_SIZE);
	148
	149	ret = skeyclass->get_skeys(ss, cur_gfn, cur_count, buf);
	150	if (ret < 0) {
	151	error_setg(errp, "get_keys error %d", ret);
	152	goto out_free;
	153	}
	154
	155	/* write keys to stream */
	156	write_keys(f, buf, cur_gfn, cur_count, &lerr);
	157	if (lerr) {
	158	goto out_free;
	159	}
	160
	161	cur_gfn += cur_count;
	162	handled_count += cur_count;
	163	}
	164
	165	out_free:
	166	error_propagate(errp, lerr);
	167	g_free(buf);
	168	out:
1fd791f0	169	fclose(f);
7ee0c3e3 JH	170	}
7ee0c3e3 JH	171
0efe406c JH	172	static void qemu_s390_skeys_init(Object *obj)
	173	{
	174	QEMUS390SKeysState *skeys = QEMU_S390_SKEYS(obj);
	175	MachineState *machine = MACHINE(qdev_get_machine());
	176
	177	skeys->key_count = machine->maxram_size / TARGET_PAGE_SIZE;
	178	skeys->keydata = g_malloc0(skeys->key_count);
	179	}
	180
	181	static int qemu_s390_skeys_enabled(S390SKeysState *ss)
	182	{
	183	return 1;
	184	}
	185
	186	/*
	187	* TODO: for memory hotplug support qemu_s390_skeys_set and qemu_s390_skeys_get
	188	* will have to make sure that the given gfn belongs to a memory region and not
	189	* a memory hole.
	190	*/
	191	static int qemu_s390_skeys_set(S390SKeysState *ss, uint64_t start_gfn,
	192	uint64_t count, uint8_t *keys)
	193	{
	194	QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
	195	int i;
	196
	197	/* Check for uint64 overflow and access beyond end of key data */
	198	if (start_gfn + count > skeydev->key_count \|\| start_gfn + count < count) {
	199	error_report("Error: Setting storage keys for page beyond the end "
9af9e0fe MA	200	"of memory: gfn=%" PRIx64 " count=%" PRId64,
9af9e0fe MA	201	start_gfn, count);
0efe406c JH	202	return -EINVAL;
	203	}
	204
	205	for (i = 0; i < count; i++) {
	206	skeydev->keydata[start_gfn + i] = keys[i];
	207	}
	208	return 0;
	209	}
	210
	211	static int qemu_s390_skeys_get(S390SKeysState *ss, uint64_t start_gfn,
	212	uint64_t count, uint8_t *keys)
	213	{
	214	QEMUS390SKeysState *skeydev = QEMU_S390_SKEYS(ss);
	215	int i;
	216
	217	/* Check for uint64 overflow and access beyond end of key data */
	218	if (start_gfn + count > skeydev->key_count \|\| start_gfn + count < count) {
	219	error_report("Error: Getting storage keys for page beyond the end "
9af9e0fe MA	220	"of memory: gfn=%" PRIx64 " count=%" PRId64,
9af9e0fe MA	221	start_gfn, count);
0efe406c JH	222	return -EINVAL;
	223	}
	224
	225	for (i = 0; i < count; i++) {
	226	keys[i] = skeydev->keydata[start_gfn + i];
	227	}
	228	return 0;
	229	}
	230
	231	static void qemu_s390_skeys_class_init(ObjectClass oc, void data)
	232	{
	233	S390SKeysClass *skeyclass = S390_SKEYS_CLASS(oc);
574ee06d	234	DeviceClass *dc = DEVICE_CLASS(oc);
0efe406c JH	235
	236	skeyclass->skeys_enabled = qemu_s390_skeys_enabled;
	237	skeyclass->get_skeys = qemu_s390_skeys_get;
	238	skeyclass->set_skeys = qemu_s390_skeys_set;
574ee06d TH	239
	240	/* Reason: Internal device (only one skeys device for the whole memory) */
	241	dc->user_creatable = false;
0efe406c JH	242	}
	243
	244	static const TypeInfo qemu_s390_skeys_info = {
	245	.name = TYPE_QEMU_S390_SKEYS,
	246	.parent = TYPE_S390_SKEYS,
	247	.instance_init = qemu_s390_skeys_init,
	248	.instance_size = sizeof(QEMUS390SKeysState),
	249	.class_init = qemu_s390_skeys_class_init,
2f2b0c66	250	.class_size = sizeof(S390SKeysClass),
0efe406c JH	251	};
0efe406c JH	252
186208fa JH	253	static void s390_storage_keys_save(QEMUFile f, void opaque)
	254	{
	255	S390SKeysState *ss = S390_SKEYS(opaque);
	256	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	257	uint64_t pages_left = ram_size / TARGET_PAGE_SIZE;
	258	uint64_t read_count, eos = S390_SKEYS_SAVE_FLAG_EOS;
	259	vaddr cur_gfn = 0;
	260	int error = 0;
	261	uint8_t *buf;
	262
	263	if (!skeyclass->skeys_enabled(ss)) {
	264	goto end_stream;
	265	}
	266
	267	buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
	268	if (!buf) {
9af9e0fe	269	error_report("storage key save could not allocate memory");
186208fa JH	270	goto end_stream;
	271	}
	272
	273	/* We only support initial memory. Standby memory is not handled yet. */
	274	qemu_put_be64(f, (cur_gfn * TARGET_PAGE_SIZE) \| S390_SKEYS_SAVE_FLAG_SKEYS);
	275	qemu_put_be64(f, pages_left);
	276
	277	while (pages_left) {
	278	read_count = MIN(pages_left, S390_SKEYS_BUFFER_SIZE);
	279
	280	if (!error) {
	281	error = skeyclass->get_skeys(ss, cur_gfn, read_count, buf);
	282	if (error) {
	283	/*
	284	* If error: we want to fill the stream with valid data instead
	285	* of stopping early so we pad the stream with 0x00 values and
	286	* use S390_SKEYS_SAVE_FLAG_ERROR to indicate failure to the
	287	* reading side.
	288	*/
9af9e0fe	289	error_report("S390_GET_KEYS error %d", error);
186208fa JH	290	memset(buf, 0, S390_SKEYS_BUFFER_SIZE);
	291	eos = S390_SKEYS_SAVE_FLAG_ERROR;
	292	}
	293	}
	294
	295	qemu_put_buffer(f, buf, read_count);
	296	cur_gfn += read_count;
	297	pages_left -= read_count;
	298	}
	299
	300	g_free(buf);
	301	end_stream:
	302	qemu_put_be64(f, eos);
	303	}
	304
	305	static int s390_storage_keys_load(QEMUFile f, void opaque, int version_id)
	306	{
	307	S390SKeysState *ss = S390_SKEYS(opaque);
	308	S390SKeysClass *skeyclass = S390_SKEYS_GET_CLASS(ss);
	309	int ret = 0;
	310
	311	while (!ret) {
	312	ram_addr_t addr;
	313	int flags;
	314
	315	addr = qemu_get_be64(f);
	316	flags = addr & ~TARGET_PAGE_MASK;
	317	addr &= TARGET_PAGE_MASK;
	318
	319	switch (flags) {
	320	case S390_SKEYS_SAVE_FLAG_SKEYS: {
	321	const uint64_t total_count = qemu_get_be64(f);
	322	uint64_t handled_count = 0, cur_count;
	323	uint64_t cur_gfn = addr / TARGET_PAGE_SIZE;
	324	uint8_t *buf = g_try_malloc(S390_SKEYS_BUFFER_SIZE);
	325
	326	if (!buf) {
9af9e0fe	327	error_report("storage key load could not allocate memory");
186208fa JH	328	ret = -ENOMEM;
	329	break;
	330	}
	331
	332	while (handled_count < total_count) {
	333	cur_count = MIN(total_count - handled_count,
	334	S390_SKEYS_BUFFER_SIZE);
	335	qemu_get_buffer(f, buf, cur_count);
	336
	337	ret = skeyclass->set_skeys(ss, cur_gfn, cur_count, buf);
	338	if (ret < 0) {
9af9e0fe	339	error_report("S390_SET_KEYS error %d", ret);
186208fa JH	340	break;
	341	}
	342	handled_count += cur_count;
	343	cur_gfn += cur_count;
	344	}
	345	g_free(buf);
	346	break;
	347	}
	348	case S390_SKEYS_SAVE_FLAG_ERROR: {
	349	error_report("Storage key data is incomplete");
	350	ret = -EINVAL;
	351	break;
	352	}
	353	case S390_SKEYS_SAVE_FLAG_EOS:
	354	/* normal exit */
	355	return 0;
	356	default:
	357	error_report("Unexpected storage key flag data: %#x", flags);
	358	ret = -EINVAL;
	359	}
	360	}
	361
	362	return ret;
	363	}
	364
9ef40173 JH	365	static inline bool s390_skeys_get_migration_enabled(Object obj, Error *errp)
	366	{
	367	S390SKeysState *ss = S390_SKEYS(obj);
	368
	369	return ss->migration_enabled;
	370	}
	371
1b6e7482 LV	372	static SaveVMHandlers savevm_s390_storage_keys = {
	373	.save_state = s390_storage_keys_save,
	374	.load_state = s390_storage_keys_load,
	375	};
	376
9ef40173 JH	377	static inline void s390_skeys_set_migration_enabled(Object *obj, bool value,
9ef40173 JH	378	Error **errp)
186208fa JH	379	{
	380	S390SKeysState *ss = S390_SKEYS(obj);
	381
9ef40173 JH	382	/* Prevent double registration of savevm handler */
	383	if (ss->migration_enabled == value) {
	384	return;
	385	}
	386
	387	ss->migration_enabled = value;
	388
	389	if (ss->migration_enabled) {
1b6e7482 LV	390	register_savevm_live(NULL, TYPE_S390_SKEYS, 0, 1,
1b6e7482 LV	391	&savevm_s390_storage_keys, ss);
9ef40173 JH	392	} else {
	393	unregister_savevm(DEVICE(ss), TYPE_S390_SKEYS, ss);
	394	}
	395	}
	396
	397	static void s390_skeys_instance_init(Object *obj)
	398	{
	399	object_property_add_bool(obj, "migration-enabled",
	400	s390_skeys_get_migration_enabled,
	401	s390_skeys_set_migration_enabled, NULL);
	402	object_property_set_bool(obj, true, "migration-enabled", NULL);
186208fa JH	403	}
186208fa JH	404
0efe406c JH	405	static void s390_skeys_class_init(ObjectClass oc, void data)
	406	{
	407	DeviceClass *dc = DEVICE_CLASS(oc);
	408
	409	dc->hotpluggable = false;
	410	set_bit(DEVICE_CATEGORY_MISC, dc->categories);
	411	}
	412
	413	static const TypeInfo s390_skeys_info = {
	414	.name = TYPE_S390_SKEYS,
	415	.parent = TYPE_DEVICE,
186208fa	416	.instance_init = s390_skeys_instance_init,
0efe406c JH	417	.instance_size = sizeof(S390SKeysState),
	418	.class_init = s390_skeys_class_init,
	419	.class_size = sizeof(S390SKeysClass),
	420	.abstract = true,
	421	};
	422
	423	static void qemu_s390_skeys_register_types(void)
	424	{
	425	type_register_static(&s390_skeys_info);
	426	type_register_static(&qemu_s390_skeys_info);
	427	}
	428
	429	type_init(qemu_s390_skeys_register_types)