diff options
Diffstat (limited to 'src/hw/s390x/s390-skeys.c')
| -rw-r--r-- | src/hw/s390x/s390-skeys.c | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/src/hw/s390x/s390-skeys.c b/src/hw/s390x/s390-skeys.c new file mode 100644 index 0000000..539ef6d --- /dev/null +++ b/src/hw/s390x/s390-skeys.c @@ -0,0 +1,415 @@ +/* + * 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 "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) { + monitor_printf(mon, "%s\n", error_get_pretty(err)); + error_free(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 "\n", 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 "\n", 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, + .instance_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\n"); + 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\n", 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\n"); + 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\n", 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) |
