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

/*
 * s390 storage key device
 *
 * Copyright 2015 IBM Corp.
 * Author(s): Jason J. Herne <[email protected]>
 *
 * 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 "hw/s390x/storage-keys.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);

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