| /* |
| * QEMU System Emulator |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * Copyright (c) 2009-2015 Red Hat Inc |
| * |
| * Authors: |
| * Juan Quintela <quintela@redhat.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "hw/boards.h" |
| #include "hw/xen/xen.h" |
| #include "net/net.h" |
| #include "migration.h" |
| #include "migration/snapshot.h" |
| #include "migration/misc.h" |
| #include "migration/register.h" |
| #include "migration/global_state.h" |
| #include "ram.h" |
| #include "qemu-file-channel.h" |
| #include "qemu-file.h" |
| #include "savevm.h" |
| #include "postcopy-ram.h" |
| #include "qapi/qmp/qerror.h" |
| #include "qemu/error-report.h" |
| #include "sysemu/cpus.h" |
| #include "exec/memory.h" |
| #include "exec/target_page.h" |
| #include "qmp-commands.h" |
| #include "trace.h" |
| #include "qemu/iov.h" |
| #include "block/snapshot.h" |
| #include "qemu/cutils.h" |
| #include "io/channel-buffer.h" |
| #include "io/channel-file.h" |
| |
| #ifndef ETH_P_RARP |
| #define ETH_P_RARP 0x8035 |
| #endif |
| #define ARP_HTYPE_ETH 0x0001 |
| #define ARP_PTYPE_IP 0x0800 |
| #define ARP_OP_REQUEST_REV 0x3 |
| |
| const unsigned int postcopy_ram_discard_version = 0; |
| |
| static bool skip_section_footers; |
| |
| /* Subcommands for QEMU_VM_COMMAND */ |
| enum qemu_vm_cmd { |
| MIG_CMD_INVALID = 0, /* Must be 0 */ |
| MIG_CMD_OPEN_RETURN_PATH, /* Tell the dest to open the Return path */ |
| MIG_CMD_PING, /* Request a PONG on the RP */ |
| |
| MIG_CMD_POSTCOPY_ADVISE, /* Prior to any page transfers, just |
| warn we might want to do PC */ |
| MIG_CMD_POSTCOPY_LISTEN, /* Start listening for incoming |
| pages as it's running. */ |
| MIG_CMD_POSTCOPY_RUN, /* Start execution */ |
| |
| MIG_CMD_POSTCOPY_RAM_DISCARD, /* A list of pages to discard that |
| were previously sent during |
| precopy but are dirty. */ |
| MIG_CMD_PACKAGED, /* Send a wrapped stream within this stream */ |
| MIG_CMD_MAX |
| }; |
| |
| #define MAX_VM_CMD_PACKAGED_SIZE (1ul << 24) |
| static struct mig_cmd_args { |
| ssize_t len; /* -1 = variable */ |
| const char *name; |
| } mig_cmd_args[] = { |
| [MIG_CMD_INVALID] = { .len = -1, .name = "INVALID" }, |
| [MIG_CMD_OPEN_RETURN_PATH] = { .len = 0, .name = "OPEN_RETURN_PATH" }, |
| [MIG_CMD_PING] = { .len = sizeof(uint32_t), .name = "PING" }, |
| [MIG_CMD_POSTCOPY_ADVISE] = { .len = 16, .name = "POSTCOPY_ADVISE" }, |
| [MIG_CMD_POSTCOPY_LISTEN] = { .len = 0, .name = "POSTCOPY_LISTEN" }, |
| [MIG_CMD_POSTCOPY_RUN] = { .len = 0, .name = "POSTCOPY_RUN" }, |
| [MIG_CMD_POSTCOPY_RAM_DISCARD] = { |
| .len = -1, .name = "POSTCOPY_RAM_DISCARD" }, |
| [MIG_CMD_PACKAGED] = { .len = 4, .name = "PACKAGED" }, |
| [MIG_CMD_MAX] = { .len = -1, .name = "MAX" }, |
| }; |
| |
| static int announce_self_create(uint8_t *buf, |
| uint8_t *mac_addr) |
| { |
| /* Ethernet header. */ |
| memset(buf, 0xff, 6); /* destination MAC addr */ |
| memcpy(buf + 6, mac_addr, 6); /* source MAC addr */ |
| *(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */ |
| |
| /* RARP header. */ |
| *(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */ |
| *(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */ |
| *(buf + 18) = 6; /* hardware addr length (ethernet) */ |
| *(buf + 19) = 4; /* protocol addr length (IPv4) */ |
| *(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */ |
| memcpy(buf + 22, mac_addr, 6); /* source hw addr */ |
| memset(buf + 28, 0x00, 4); /* source protocol addr */ |
| memcpy(buf + 32, mac_addr, 6); /* target hw addr */ |
| memset(buf + 38, 0x00, 4); /* target protocol addr */ |
| |
| /* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */ |
| memset(buf + 42, 0x00, 18); |
| |
| return 60; /* len (FCS will be added by hardware) */ |
| } |
| |
| static void qemu_announce_self_iter(NICState *nic, void *opaque) |
| { |
| uint8_t buf[60]; |
| int len; |
| |
| trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr)); |
| len = announce_self_create(buf, nic->conf->macaddr.a); |
| |
| qemu_send_packet_raw(qemu_get_queue(nic), buf, len); |
| } |
| |
| |
| static void qemu_announce_self_once(void *opaque) |
| { |
| static int count = SELF_ANNOUNCE_ROUNDS; |
| QEMUTimer *timer = *(QEMUTimer **)opaque; |
| |
| qemu_foreach_nic(qemu_announce_self_iter, NULL); |
| |
| if (--count) { |
| /* delay 50ms, 150ms, 250ms, ... */ |
| timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + |
| self_announce_delay(count)); |
| } else { |
| timer_del(timer); |
| timer_free(timer); |
| } |
| } |
| |
| void qemu_announce_self(void) |
| { |
| static QEMUTimer *timer; |
| timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer); |
| qemu_announce_self_once(&timer); |
| } |
| |
| /***********************************************************/ |
| /* savevm/loadvm support */ |
| |
| static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt, |
| int64_t pos) |
| { |
| int ret; |
| QEMUIOVector qiov; |
| |
| qemu_iovec_init_external(&qiov, iov, iovcnt); |
| ret = bdrv_writev_vmstate(opaque, &qiov, pos); |
| if (ret < 0) { |
| return ret; |
| } |
| |
| return qiov.size; |
| } |
| |
| static ssize_t block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, |
| size_t size) |
| { |
| return bdrv_load_vmstate(opaque, buf, pos, size); |
| } |
| |
| static int bdrv_fclose(void *opaque) |
| { |
| return bdrv_flush(opaque); |
| } |
| |
| static const QEMUFileOps bdrv_read_ops = { |
| .get_buffer = block_get_buffer, |
| .close = bdrv_fclose |
| }; |
| |
| static const QEMUFileOps bdrv_write_ops = { |
| .writev_buffer = block_writev_buffer, |
| .close = bdrv_fclose |
| }; |
| |
| static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable) |
| { |
| if (is_writable) { |
| return qemu_fopen_ops(bs, &bdrv_write_ops); |
| } |
| return qemu_fopen_ops(bs, &bdrv_read_ops); |
| } |
| |
| |
| /* QEMUFile timer support. |
| * Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c |
| */ |
| |
| void timer_put(QEMUFile *f, QEMUTimer *ts) |
| { |
| uint64_t expire_time; |
| |
| expire_time = timer_expire_time_ns(ts); |
| qemu_put_be64(f, expire_time); |
| } |
| |
| void timer_get(QEMUFile *f, QEMUTimer *ts) |
| { |
| uint64_t expire_time; |
| |
| expire_time = qemu_get_be64(f); |
| if (expire_time != -1) { |
| timer_mod_ns(ts, expire_time); |
| } else { |
| timer_del(ts); |
| } |
| } |
| |
| |
| /* VMState timer support. |
| * Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c |
| */ |
| |
| static int get_timer(QEMUFile *f, void *pv, size_t size, VMStateField *field) |
| { |
| QEMUTimer *v = pv; |
| timer_get(f, v); |
| return 0; |
| } |
| |
| static int put_timer(QEMUFile *f, void *pv, size_t size, VMStateField *field, |
| QJSON *vmdesc) |
| { |
| QEMUTimer *v = pv; |
| timer_put(f, v); |
| |
| return 0; |
| } |
| |
| const VMStateInfo vmstate_info_timer = { |
| .name = "timer", |
| .get = get_timer, |
| .put = put_timer, |
| }; |
| |
| |
| typedef struct CompatEntry { |
| char idstr[256]; |
| int instance_id; |
| } CompatEntry; |
| |
| typedef struct SaveStateEntry { |
| QTAILQ_ENTRY(SaveStateEntry) entry; |
| char idstr[256]; |
| int instance_id; |
| int alias_id; |
| int version_id; |
| /* version id read from the stream */ |
| int load_version_id; |
| int section_id; |
| /* section id read from the stream */ |
| int load_section_id; |
| SaveVMHandlers *ops; |
| const VMStateDescription *vmsd; |
| void *opaque; |
| CompatEntry *compat; |
| int is_ram; |
| } SaveStateEntry; |
| |
| typedef struct SaveState { |
| QTAILQ_HEAD(, SaveStateEntry) handlers; |
| int global_section_id; |
| bool skip_configuration; |
| uint32_t len; |
| const char *name; |
| uint32_t target_page_bits; |
| } SaveState; |
| |
| static SaveState savevm_state = { |
| .handlers = QTAILQ_HEAD_INITIALIZER(savevm_state.handlers), |
| .global_section_id = 0, |
| .skip_configuration = false, |
| }; |
| |
| void savevm_skip_configuration(void) |
| { |
| savevm_state.skip_configuration = true; |
| } |
| |
| |
| static void configuration_pre_save(void *opaque) |
| { |
| SaveState *state = opaque; |
| const char *current_name = MACHINE_GET_CLASS(current_machine)->name; |
| |
| state->len = strlen(current_name); |
| state->name = current_name; |
| state->target_page_bits = qemu_target_page_bits(); |
| } |
| |
| static int configuration_pre_load(void *opaque) |
| { |
| SaveState *state = opaque; |
| |
| /* If there is no target-page-bits subsection it means the source |
| * predates the variable-target-page-bits support and is using the |
| * minimum possible value for this CPU. |
| */ |
| state->target_page_bits = qemu_target_page_bits_min(); |
| return 0; |
| } |
| |
| static int configuration_post_load(void *opaque, int version_id) |
| { |
| SaveState *state = opaque; |
| const char *current_name = MACHINE_GET_CLASS(current_machine)->name; |
| |
| if (strncmp(state->name, current_name, state->len) != 0) { |
| error_report("Machine type received is '%.*s' and local is '%s'", |
| (int) state->len, state->name, current_name); |
| return -EINVAL; |
| } |
| |
| if (state->target_page_bits != qemu_target_page_bits()) { |
| error_report("Received TARGET_PAGE_BITS is %d but local is %d", |
| state->target_page_bits, qemu_target_page_bits()); |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /* The target-page-bits subsection is present only if the |
| * target page size is not the same as the default (ie the |
| * minimum page size for a variable-page-size guest CPU). |
| * If it is present then it contains the actual target page |
| * bits for the machine, and migration will fail if the |
| * two ends don't agree about it. |
| */ |
| static bool vmstate_target_page_bits_needed(void *opaque) |
| { |
| return qemu_target_page_bits() |
| > qemu_target_page_bits_min(); |
| } |
| |
| static const VMStateDescription vmstate_target_page_bits = { |
| .name = "configuration/target-page-bits", |
| .version_id = 1, |
| .minimum_version_id = 1, |
| .needed = vmstate_target_page_bits_needed, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32(target_page_bits, SaveState), |
| VMSTATE_END_OF_LIST() |
| } |
| }; |
| |
| static const VMStateDescription vmstate_configuration = { |
| .name = "configuration", |
| .version_id = 1, |
| .pre_load = configuration_pre_load, |
| .post_load = configuration_post_load, |
| .pre_save = configuration_pre_save, |
| .fields = (VMStateField[]) { |
| VMSTATE_UINT32(len, SaveState), |
| VMSTATE_VBUFFER_ALLOC_UINT32(name, SaveState, 0, NULL, len), |
| VMSTATE_END_OF_LIST() |
| }, |
| .subsections = (const VMStateDescription*[]) { |
| &vmstate_target_page_bits, |
| NULL |
| } |
| }; |
| |
| static void dump_vmstate_vmsd(FILE *out_file, |
| const VMStateDescription *vmsd, int indent, |
| bool is_subsection); |
| |
| static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field, |
| int indent) |
| { |
| fprintf(out_file, "%*s{\n", indent, ""); |
| indent += 2; |
| fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name); |
| fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", |
| field->version_id); |
| fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "", |
| field->field_exists ? "true" : "false"); |
| fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size); |
| if (field->vmsd != NULL) { |
| fprintf(out_file, ",\n"); |
| dump_vmstate_vmsd(out_file, field->vmsd, indent, false); |
| } |
| fprintf(out_file, "\n%*s}", indent - 2, ""); |
| } |
| |
| static void dump_vmstate_vmss(FILE *out_file, |
| const VMStateDescription **subsection, |
| int indent) |
| { |
| if (*subsection != NULL) { |
| dump_vmstate_vmsd(out_file, *subsection, indent, true); |
| } |
| } |
| |
| static void dump_vmstate_vmsd(FILE *out_file, |
| const VMStateDescription *vmsd, int indent, |
| bool is_subsection) |
| { |
| if (is_subsection) { |
| fprintf(out_file, "%*s{\n", indent, ""); |
| } else { |
| fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description"); |
| } |
| indent += 2; |
| fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name); |
| fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", |
| vmsd->version_id); |
| fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "", |
| vmsd->minimum_version_id); |
| if (vmsd->fields != NULL) { |
| const VMStateField *field = vmsd->fields; |
| bool first; |
| |
| fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, ""); |
| first = true; |
| while (field->name != NULL) { |
| if (field->flags & VMS_MUST_EXIST) { |
| /* Ignore VMSTATE_VALIDATE bits; these don't get migrated */ |
| field++; |
| continue; |
| } |
| if (!first) { |
| fprintf(out_file, ",\n"); |
| } |
| dump_vmstate_vmsf(out_file, field, indent + 2); |
| field++; |
| first = false; |
| } |
| fprintf(out_file, "\n%*s]", indent, ""); |
| } |
| if (vmsd->subsections != NULL) { |
| const VMStateDescription **subsection = vmsd->subsections; |
| bool first; |
| |
| fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, ""); |
| first = true; |
| while (*subsection != NULL) { |
| if (!first) { |
| fprintf(out_file, ",\n"); |
| } |
| dump_vmstate_vmss(out_file, subsection, indent + 2); |
| subsection++; |
| first = false; |
| } |
| fprintf(out_file, "\n%*s]", indent, ""); |
| } |
| fprintf(out_file, "\n%*s}", indent - 2, ""); |
| } |
| |
| static void dump_machine_type(FILE *out_file) |
| { |
| MachineClass *mc; |
| |
| mc = MACHINE_GET_CLASS(current_machine); |
| |
| fprintf(out_file, " \"vmschkmachine\": {\n"); |
| fprintf(out_file, " \"Name\": \"%s\"\n", mc->name); |
| fprintf(out_file, " },\n"); |
| } |
| |
| void dump_vmstate_json_to_file(FILE *out_file) |
| { |
| GSList *list, *elt; |
| bool first; |
| |
| fprintf(out_file, "{\n"); |
| dump_machine_type(out_file); |
| |
| first = true; |
| list = object_class_get_list(TYPE_DEVICE, true); |
| for (elt = list; elt; elt = elt->next) { |
| DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data, |
| TYPE_DEVICE); |
| const char *name; |
| int indent = 2; |
| |
| if (!dc->vmsd) { |
| continue; |
| } |
| |
| if (!first) { |
| fprintf(out_file, ",\n"); |
| } |
| name = object_class_get_name(OBJECT_CLASS(dc)); |
| fprintf(out_file, "%*s\"%s\": {\n", indent, "", name); |
| indent += 2; |
| fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name); |
| fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "", |
| dc->vmsd->version_id); |
| fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "", |
| dc->vmsd->minimum_version_id); |
| |
| dump_vmstate_vmsd(out_file, dc->vmsd, indent, false); |
| |
| fprintf(out_file, "\n%*s}", indent - 2, ""); |
| first = false; |
| } |
| fprintf(out_file, "\n}\n"); |
| fclose(out_file); |
| } |
| |
| static int calculate_new_instance_id(const char *idstr) |
| { |
| SaveStateEntry *se; |
| int instance_id = 0; |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (strcmp(idstr, se->idstr) == 0 |
| && instance_id <= se->instance_id) { |
| instance_id = se->instance_id + 1; |
| } |
| } |
| return instance_id; |
| } |
| |
| static int calculate_compat_instance_id(const char *idstr) |
| { |
| SaveStateEntry *se; |
| int instance_id = 0; |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!se->compat) { |
| continue; |
| } |
| |
| if (strcmp(idstr, se->compat->idstr) == 0 |
| && instance_id <= se->compat->instance_id) { |
| instance_id = se->compat->instance_id + 1; |
| } |
| } |
| return instance_id; |
| } |
| |
| static inline MigrationPriority save_state_priority(SaveStateEntry *se) |
| { |
| if (se->vmsd) { |
| return se->vmsd->priority; |
| } |
| return MIG_PRI_DEFAULT; |
| } |
| |
| static void savevm_state_handler_insert(SaveStateEntry *nse) |
| { |
| MigrationPriority priority = save_state_priority(nse); |
| SaveStateEntry *se; |
| |
| assert(priority <= MIG_PRI_MAX); |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (save_state_priority(se) < priority) { |
| break; |
| } |
| } |
| |
| if (se) { |
| QTAILQ_INSERT_BEFORE(se, nse, entry); |
| } else { |
| QTAILQ_INSERT_TAIL(&savevm_state.handlers, nse, entry); |
| } |
| } |
| |
| /* TODO: Individual devices generally have very little idea about the rest |
| of the system, so instance_id should be removed/replaced. |
| Meanwhile pass -1 as instance_id if you do not already have a clearly |
| distinguishing id for all instances of your device class. */ |
| int register_savevm_live(DeviceState *dev, |
| const char *idstr, |
| int instance_id, |
| int version_id, |
| SaveVMHandlers *ops, |
| void *opaque) |
| { |
| SaveStateEntry *se; |
| |
| se = g_new0(SaveStateEntry, 1); |
| se->version_id = version_id; |
| se->section_id = savevm_state.global_section_id++; |
| se->ops = ops; |
| se->opaque = opaque; |
| se->vmsd = NULL; |
| /* if this is a live_savem then set is_ram */ |
| if (ops->save_live_setup != NULL) { |
| se->is_ram = 1; |
| } |
| |
| if (dev) { |
| char *id = qdev_get_dev_path(dev); |
| if (id) { |
| if (snprintf(se->idstr, sizeof(se->idstr), "%s/", id) >= |
| sizeof(se->idstr)) { |
| error_report("Path too long for VMState (%s)", id); |
| g_free(id); |
| g_free(se); |
| |
| return -1; |
| } |
| g_free(id); |
| |
| se->compat = g_new0(CompatEntry, 1); |
| pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr); |
| se->compat->instance_id = instance_id == -1 ? |
| calculate_compat_instance_id(idstr) : instance_id; |
| instance_id = -1; |
| } |
| } |
| pstrcat(se->idstr, sizeof(se->idstr), idstr); |
| |
| if (instance_id == -1) { |
| se->instance_id = calculate_new_instance_id(se->idstr); |
| } else { |
| se->instance_id = instance_id; |
| } |
| assert(!se->compat || se->instance_id == 0); |
| savevm_state_handler_insert(se); |
| return 0; |
| } |
| |
| void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque) |
| { |
| SaveStateEntry *se, *new_se; |
| char id[256] = ""; |
| |
| if (dev) { |
| char *path = qdev_get_dev_path(dev); |
| if (path) { |
| pstrcpy(id, sizeof(id), path); |
| pstrcat(id, sizeof(id), "/"); |
| g_free(path); |
| } |
| } |
| pstrcat(id, sizeof(id), idstr); |
| |
| QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { |
| if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) { |
| QTAILQ_REMOVE(&savevm_state.handlers, se, entry); |
| g_free(se->compat); |
| g_free(se); |
| } |
| } |
| } |
| |
| int vmstate_register_with_alias_id(DeviceState *dev, int instance_id, |
| const VMStateDescription *vmsd, |
| void *opaque, int alias_id, |
| int required_for_version, |
| Error **errp) |
| { |
| SaveStateEntry *se; |
| |
| /* If this triggers, alias support can be dropped for the vmsd. */ |
| assert(alias_id == -1 || required_for_version >= vmsd->minimum_version_id); |
| |
| se = g_new0(SaveStateEntry, 1); |
| se->version_id = vmsd->version_id; |
| se->section_id = savevm_state.global_section_id++; |
| se->opaque = opaque; |
| se->vmsd = vmsd; |
| se->alias_id = alias_id; |
| |
| if (dev) { |
| char *id = qdev_get_dev_path(dev); |
| if (id) { |
| if (snprintf(se->idstr, sizeof(se->idstr), "%s/", id) >= |
| sizeof(se->idstr)) { |
| error_setg(errp, "Path too long for VMState (%s)", id); |
| g_free(id); |
| g_free(se); |
| |
| return -1; |
| } |
| g_free(id); |
| |
| se->compat = g_new0(CompatEntry, 1); |
| pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), vmsd->name); |
| se->compat->instance_id = instance_id == -1 ? |
| calculate_compat_instance_id(vmsd->name) : instance_id; |
| instance_id = -1; |
| } |
| } |
| pstrcat(se->idstr, sizeof(se->idstr), vmsd->name); |
| |
| if (instance_id == -1) { |
| se->instance_id = calculate_new_instance_id(se->idstr); |
| } else { |
| se->instance_id = instance_id; |
| } |
| assert(!se->compat || se->instance_id == 0); |
| savevm_state_handler_insert(se); |
| return 0; |
| } |
| |
| void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd, |
| void *opaque) |
| { |
| SaveStateEntry *se, *new_se; |
| |
| QTAILQ_FOREACH_SAFE(se, &savevm_state.handlers, entry, new_se) { |
| if (se->vmsd == vmsd && se->opaque == opaque) { |
| QTAILQ_REMOVE(&savevm_state.handlers, se, entry); |
| g_free(se->compat); |
| g_free(se); |
| } |
| } |
| } |
| |
| static int vmstate_load(QEMUFile *f, SaveStateEntry *se) |
| { |
| trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); |
| if (!se->vmsd) { /* Old style */ |
| return se->ops->load_state(f, se->opaque, se->load_version_id); |
| } |
| return vmstate_load_state(f, se->vmsd, se->opaque, se->load_version_id); |
| } |
| |
| static void vmstate_save_old_style(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) |
| { |
| int64_t old_offset, size; |
| |
| old_offset = qemu_ftell_fast(f); |
| se->ops->save_state(f, se->opaque); |
| size = qemu_ftell_fast(f) - old_offset; |
| |
| if (vmdesc) { |
| json_prop_int(vmdesc, "size", size); |
| json_start_array(vmdesc, "fields"); |
| json_start_object(vmdesc, NULL); |
| json_prop_str(vmdesc, "name", "data"); |
| json_prop_int(vmdesc, "size", size); |
| json_prop_str(vmdesc, "type", "buffer"); |
| json_end_object(vmdesc); |
| json_end_array(vmdesc); |
| } |
| } |
| |
| static void vmstate_save(QEMUFile *f, SaveStateEntry *se, QJSON *vmdesc) |
| { |
| trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)"); |
| if (!se->vmsd) { |
| vmstate_save_old_style(f, se, vmdesc); |
| return; |
| } |
| vmstate_save_state(f, se->vmsd, se->opaque, vmdesc); |
| } |
| |
| void savevm_skip_section_footers(void) |
| { |
| skip_section_footers = true; |
| } |
| |
| /* |
| * Write the header for device section (QEMU_VM_SECTION START/END/PART/FULL) |
| */ |
| static void save_section_header(QEMUFile *f, SaveStateEntry *se, |
| uint8_t section_type) |
| { |
| qemu_put_byte(f, section_type); |
| qemu_put_be32(f, se->section_id); |
| |
| if (section_type == QEMU_VM_SECTION_FULL || |
| section_type == QEMU_VM_SECTION_START) { |
| /* ID string */ |
| size_t len = strlen(se->idstr); |
| qemu_put_byte(f, len); |
| qemu_put_buffer(f, (uint8_t *)se->idstr, len); |
| |
| qemu_put_be32(f, se->instance_id); |
| qemu_put_be32(f, se->version_id); |
| } |
| } |
| |
| /* |
| * Write a footer onto device sections that catches cases misformatted device |
| * sections. |
| */ |
| static void save_section_footer(QEMUFile *f, SaveStateEntry *se) |
| { |
| if (!skip_section_footers) { |
| qemu_put_byte(f, QEMU_VM_SECTION_FOOTER); |
| qemu_put_be32(f, se->section_id); |
| } |
| } |
| |
| /** |
| * qemu_savevm_command_send: Send a 'QEMU_VM_COMMAND' type element with the |
| * command and associated data. |
| * |
| * @f: File to send command on |
| * @command: Command type to send |
| * @len: Length of associated data |
| * @data: Data associated with command. |
| */ |
| static void qemu_savevm_command_send(QEMUFile *f, |
| enum qemu_vm_cmd command, |
| uint16_t len, |
| uint8_t *data) |
| { |
| trace_savevm_command_send(command, len); |
| qemu_put_byte(f, QEMU_VM_COMMAND); |
| qemu_put_be16(f, (uint16_t)command); |
| qemu_put_be16(f, len); |
| qemu_put_buffer(f, data, len); |
| qemu_fflush(f); |
| } |
| |
| void qemu_savevm_send_ping(QEMUFile *f, uint32_t value) |
| { |
| uint32_t buf; |
| |
| trace_savevm_send_ping(value); |
| buf = cpu_to_be32(value); |
| qemu_savevm_command_send(f, MIG_CMD_PING, sizeof(value), (uint8_t *)&buf); |
| } |
| |
| void qemu_savevm_send_open_return_path(QEMUFile *f) |
| { |
| trace_savevm_send_open_return_path(); |
| qemu_savevm_command_send(f, MIG_CMD_OPEN_RETURN_PATH, 0, NULL); |
| } |
| |
| /* We have a buffer of data to send; we don't want that all to be loaded |
| * by the command itself, so the command contains just the length of the |
| * extra buffer that we then send straight after it. |
| * TODO: Must be a better way to organise that |
| * |
| * Returns: |
| * 0 on success |
| * -ve on error |
| */ |
| int qemu_savevm_send_packaged(QEMUFile *f, const uint8_t *buf, size_t len) |
| { |
| uint32_t tmp; |
| |
| if (len > MAX_VM_CMD_PACKAGED_SIZE) { |
| error_report("%s: Unreasonably large packaged state: %zu", |
| __func__, len); |
| return -1; |
| } |
| |
| tmp = cpu_to_be32(len); |
| |
| trace_qemu_savevm_send_packaged(); |
| qemu_savevm_command_send(f, MIG_CMD_PACKAGED, 4, (uint8_t *)&tmp); |
| |
| qemu_put_buffer(f, buf, len); |
| |
| return 0; |
| } |
| |
| /* Send prior to any postcopy transfer */ |
| void qemu_savevm_send_postcopy_advise(QEMUFile *f) |
| { |
| uint64_t tmp[2]; |
| tmp[0] = cpu_to_be64(ram_pagesize_summary()); |
| tmp[1] = cpu_to_be64(qemu_target_page_size()); |
| |
| trace_qemu_savevm_send_postcopy_advise(); |
| qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_ADVISE, 16, (uint8_t *)tmp); |
| } |
| |
| /* Sent prior to starting the destination running in postcopy, discard pages |
| * that have already been sent but redirtied on the source. |
| * CMD_POSTCOPY_RAM_DISCARD consist of: |
| * byte version (0) |
| * byte Length of name field (not including 0) |
| * n x byte RAM block name |
| * byte 0 terminator (just for safety) |
| * n x Byte ranges within the named RAMBlock |
| * be64 Start of the range |
| * be64 Length |
| * |
| * name: RAMBlock name that these entries are part of |
| * len: Number of page entries |
| * start_list: 'len' addresses |
| * length_list: 'len' addresses |
| * |
| */ |
| void qemu_savevm_send_postcopy_ram_discard(QEMUFile *f, const char *name, |
| uint16_t len, |
| uint64_t *start_list, |
| uint64_t *length_list) |
| { |
| uint8_t *buf; |
| uint16_t tmplen; |
| uint16_t t; |
| size_t name_len = strlen(name); |
| |
| trace_qemu_savevm_send_postcopy_ram_discard(name, len); |
| assert(name_len < 256); |
| buf = g_malloc0(1 + 1 + name_len + 1 + (8 + 8) * len); |
| buf[0] = postcopy_ram_discard_version; |
| buf[1] = name_len; |
| memcpy(buf + 2, name, name_len); |
| tmplen = 2 + name_len; |
| buf[tmplen++] = '\0'; |
| |
| for (t = 0; t < len; t++) { |
| stq_be_p(buf + tmplen, start_list[t]); |
| tmplen += 8; |
| stq_be_p(buf + tmplen, length_list[t]); |
| tmplen += 8; |
| } |
| qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RAM_DISCARD, tmplen, buf); |
| g_free(buf); |
| } |
| |
| /* Get the destination into a state where it can receive postcopy data. */ |
| void qemu_savevm_send_postcopy_listen(QEMUFile *f) |
| { |
| trace_savevm_send_postcopy_listen(); |
| qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_LISTEN, 0, NULL); |
| } |
| |
| /* Kick the destination into running */ |
| void qemu_savevm_send_postcopy_run(QEMUFile *f) |
| { |
| trace_savevm_send_postcopy_run(); |
| qemu_savevm_command_send(f, MIG_CMD_POSTCOPY_RUN, 0, NULL); |
| } |
| |
| bool qemu_savevm_state_blocked(Error **errp) |
| { |
| SaveStateEntry *se; |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (se->vmsd && se->vmsd->unmigratable) { |
| error_setg(errp, "State blocked by non-migratable device '%s'", |
| se->idstr); |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| static bool enforce_config_section(void) |
| { |
| MachineState *machine = MACHINE(qdev_get_machine()); |
| return machine->enforce_config_section; |
| } |
| |
| void qemu_savevm_state_header(QEMUFile *f) |
| { |
| trace_savevm_state_header(); |
| qemu_put_be32(f, QEMU_VM_FILE_MAGIC); |
| qemu_put_be32(f, QEMU_VM_FILE_VERSION); |
| |
| if (!savevm_state.skip_configuration || enforce_config_section()) { |
| qemu_put_byte(f, QEMU_VM_CONFIGURATION); |
| vmstate_save_state(f, &vmstate_configuration, &savevm_state, 0); |
| } |
| |
| } |
| |
| void qemu_savevm_state_begin(QEMUFile *f) |
| { |
| SaveStateEntry *se; |
| int ret; |
| |
| trace_savevm_state_begin(); |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!se->ops || !se->ops->save_live_setup) { |
| continue; |
| } |
| if (se->ops && se->ops->is_active) { |
| if (!se->ops->is_active(se->opaque)) { |
| continue; |
| } |
| } |
| save_section_header(f, se, QEMU_VM_SECTION_START); |
| |
| ret = se->ops->save_live_setup(f, se->opaque); |
| save_section_footer(f, se); |
| if (ret < 0) { |
| qemu_file_set_error(f, ret); |
| break; |
| } |
| } |
| } |
| |
| /* |
| * this function has three return values: |
| * negative: there was one error, and we have -errno. |
| * 0 : We haven't finished, caller have to go again |
| * 1 : We have finished, we can go to complete phase |
| */ |
| int qemu_savevm_state_iterate(QEMUFile *f, bool postcopy) |
| { |
| SaveStateEntry *se; |
| int ret = 1; |
| |
| trace_savevm_state_iterate(); |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!se->ops || !se->ops->save_live_iterate) { |
| continue; |
| } |
| if (se->ops && se->ops->is_active) { |
| if (!se->ops->is_active(se->opaque)) { |
| continue; |
| } |
| } |
| /* |
| * In the postcopy phase, any device that doesn't know how to |
| * do postcopy should have saved it's state in the _complete |
| * call that's already run, it might get confused if we call |
| * iterate afterwards. |
| */ |
| if (postcopy && !se->ops->save_live_complete_postcopy) { |
| continue; |
| } |
| if (qemu_file_rate_limit(f)) { |
| return 0; |
| } |
| trace_savevm_section_start(se->idstr, se->section_id); |
| |
| save_section_header(f, se, QEMU_VM_SECTION_PART); |
| |
| ret = se->ops->save_live_iterate(f, se->opaque); |
| trace_savevm_section_end(se->idstr, se->section_id, ret); |
| save_section_footer(f, se); |
| |
| if (ret < 0) { |
| qemu_file_set_error(f, ret); |
| } |
| if (ret <= 0) { |
| /* Do not proceed to the next vmstate before this one reported |
| completion of the current stage. This serializes the migration |
| and reduces the probability that a faster changing state is |
| synchronized over and over again. */ |
| break; |
| } |
| } |
| return ret; |
| } |
| |
| static bool should_send_vmdesc(void) |
| { |
| MachineState *machine = MACHINE(qdev_get_machine()); |
| bool in_postcopy = migration_in_postcopy(); |
| return !machine->suppress_vmdesc && !in_postcopy; |
| } |
| |
| /* |
| * Calls the save_live_complete_postcopy methods |
| * causing the last few pages to be sent immediately and doing any associated |
| * cleanup. |
| * Note postcopy also calls qemu_savevm_state_complete_precopy to complete |
| * all the other devices, but that happens at the point we switch to postcopy. |
| */ |
| void qemu_savevm_state_complete_postcopy(QEMUFile *f) |
| { |
| SaveStateEntry *se; |
| int ret; |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!se->ops || !se->ops->save_live_complete_postcopy) { |
| continue; |
| } |
| if (se->ops && se->ops->is_active) { |
| if (!se->ops->is_active(se->opaque)) { |
| continue; |
| } |
| } |
| trace_savevm_section_start(se->idstr, se->section_id); |
| /* Section type */ |
| qemu_put_byte(f, QEMU_VM_SECTION_END); |
| qemu_put_be32(f, se->section_id); |
| |
| ret = se->ops->save_live_complete_postcopy(f, se->opaque); |
| trace_savevm_section_end(se->idstr, se->section_id, ret); |
| save_section_footer(f, se); |
| if (ret < 0) { |
| qemu_file_set_error(f, ret); |
| return; |
| } |
| } |
| |
| qemu_put_byte(f, QEMU_VM_EOF); |
| qemu_fflush(f); |
| } |
| |
| void qemu_savevm_state_complete_precopy(QEMUFile *f, bool iterable_only) |
| { |
| QJSON *vmdesc; |
| int vmdesc_len; |
| SaveStateEntry *se; |
| int ret; |
| bool in_postcopy = migration_in_postcopy(); |
| |
| trace_savevm_state_complete_precopy(); |
| |
| cpu_synchronize_all_states(); |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!se->ops || |
| (in_postcopy && se->ops->save_live_complete_postcopy) || |
| (in_postcopy && !iterable_only) || |
| !se->ops->save_live_complete_precopy) { |
| continue; |
| } |
| |
| if (se->ops && se->ops->is_active) { |
| if (!se->ops->is_active(se->opaque)) { |
| continue; |
| } |
| } |
| trace_savevm_section_start(se->idstr, se->section_id); |
| |
| save_section_header(f, se, QEMU_VM_SECTION_END); |
| |
| ret = se->ops->save_live_complete_precopy(f, se->opaque); |
| trace_savevm_section_end(se->idstr, se->section_id, ret); |
| save_section_footer(f, se); |
| if (ret < 0) { |
| qemu_file_set_error(f, ret); |
| return; |
| } |
| } |
| |
| if (iterable_only) { |
| return; |
| } |
| |
| vmdesc = qjson_new(); |
| json_prop_int(vmdesc, "page_size", qemu_target_page_size()); |
| json_start_array(vmdesc, "devices"); |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| |
| if ((!se->ops || !se->ops->save_state) && !se->vmsd) { |
| continue; |
| } |
| if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { |
| trace_savevm_section_skip(se->idstr, se->section_id); |
| continue; |
| } |
| |
| trace_savevm_section_start(se->idstr, se->section_id); |
| |
| json_start_object(vmdesc, NULL); |
| json_prop_str(vmdesc, "name", se->idstr); |
| json_prop_int(vmdesc, "instance_id", se->instance_id); |
| |
| save_section_header(f, se, QEMU_VM_SECTION_FULL); |
| vmstate_save(f, se, vmdesc); |
| trace_savevm_section_end(se->idstr, se->section_id, 0); |
| save_section_footer(f, se); |
| |
| json_end_object(vmdesc); |
| } |
| |
| if (!in_postcopy) { |
| /* Postcopy stream will still be going */ |
| qemu_put_byte(f, QEMU_VM_EOF); |
| } |
| |
| json_end_array(vmdesc); |
| qjson_finish(vmdesc); |
| vmdesc_len = strlen(qjson_get_str(vmdesc)); |
| |
| if (should_send_vmdesc()) { |
| qemu_put_byte(f, QEMU_VM_VMDESCRIPTION); |
| qemu_put_be32(f, vmdesc_len); |
| qemu_put_buffer(f, (uint8_t *)qjson_get_str(vmdesc), vmdesc_len); |
| } |
| qjson_destroy(vmdesc); |
| |
| qemu_fflush(f); |
| } |
| |
| /* Give an estimate of the amount left to be transferred, |
| * the result is split into the amount for units that can and |
| * for units that can't do postcopy. |
| */ |
| void qemu_savevm_state_pending(QEMUFile *f, uint64_t threshold_size, |
| uint64_t *res_non_postcopiable, |
| uint64_t *res_postcopiable) |
| { |
| SaveStateEntry *se; |
| |
| *res_non_postcopiable = 0; |
| *res_postcopiable = 0; |
| |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!se->ops || !se->ops->save_live_pending) { |
| continue; |
| } |
| if (se->ops && se->ops->is_active) { |
| if (!se->ops->is_active(se->opaque)) { |
| continue; |
| } |
| } |
| se->ops->save_live_pending(f, se->opaque, threshold_size, |
| res_non_postcopiable, res_postcopiable); |
| } |
| } |
| |
| void qemu_savevm_state_cleanup(void) |
| { |
| SaveStateEntry *se; |
| |
| trace_savevm_state_cleanup(); |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (se->ops && se->ops->cleanup) { |
| se->ops->cleanup(se->opaque); |
| } |
| } |
| } |
| |
| static int qemu_savevm_state(QEMUFile *f, Error **errp) |
| { |
| int ret; |
| MigrationState *ms = migrate_init(); |
| MigrationStatus status; |
| ms->to_dst_file = f; |
| |
| if (migration_is_blocked(errp)) { |
| ret = -EINVAL; |
| goto done; |
| } |
| |
| if (migrate_use_block()) { |
| error_setg(errp, "Block migration and snapshots are incompatible"); |
| ret = -EINVAL; |
| goto done; |
| } |
| |
| qemu_mutex_unlock_iothread(); |
| qemu_savevm_state_header(f); |
| qemu_savevm_state_begin(f); |
| qemu_mutex_lock_iothread(); |
| |
| while (qemu_file_get_error(f) == 0) { |
| if (qemu_savevm_state_iterate(f, false) > 0) { |
| break; |
| } |
| } |
| |
| ret = qemu_file_get_error(f); |
| if (ret == 0) { |
| qemu_savevm_state_complete_precopy(f, false); |
| ret = qemu_file_get_error(f); |
| } |
| qemu_savevm_state_cleanup(); |
| if (ret != 0) { |
| error_setg_errno(errp, -ret, "Error while writing VM state"); |
| } |
| |
| done: |
| if (ret != 0) { |
| status = MIGRATION_STATUS_FAILED; |
| } else { |
| status = MIGRATION_STATUS_COMPLETED; |
| } |
| migrate_set_state(&ms->state, MIGRATION_STATUS_SETUP, status); |
| |
| /* f is outer parameter, it should not stay in global migration state after |
| * this function finished */ |
| ms->to_dst_file = NULL; |
| |
| return ret; |
| } |
| |
| static int qemu_save_device_state(QEMUFile *f) |
| { |
| SaveStateEntry *se; |
| |
| qemu_put_be32(f, QEMU_VM_FILE_MAGIC); |
| qemu_put_be32(f, QEMU_VM_FILE_VERSION); |
| |
| cpu_synchronize_all_states(); |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (se->is_ram) { |
| continue; |
| } |
| if ((!se->ops || !se->ops->save_state) && !se->vmsd) { |
| continue; |
| } |
| if (se->vmsd && !vmstate_save_needed(se->vmsd, se->opaque)) { |
| continue; |
| } |
| |
| save_section_header(f, se, QEMU_VM_SECTION_FULL); |
| |
| vmstate_save(f, se, NULL); |
| |
| save_section_footer(f, se); |
| } |
| |
| qemu_put_byte(f, QEMU_VM_EOF); |
| |
| return qemu_file_get_error(f); |
| } |
| |
| static SaveStateEntry *find_se(const char *idstr, int instance_id) |
| { |
| SaveStateEntry *se; |
| |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (!strcmp(se->idstr, idstr) && |
| (instance_id == se->instance_id || |
| instance_id == se->alias_id)) |
| return se; |
| /* Migrating from an older version? */ |
| if (strstr(se->idstr, idstr) && se->compat) { |
| if (!strcmp(se->compat->idstr, idstr) && |
| (instance_id == se->compat->instance_id || |
| instance_id == se->alias_id)) |
| return se; |
| } |
| } |
| return NULL; |
| } |
| |
| enum LoadVMExitCodes { |
| /* Allow a command to quit all layers of nested loadvm loops */ |
| LOADVM_QUIT = 1, |
| }; |
| |
| static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis); |
| |
| /* ------ incoming postcopy messages ------ */ |
| /* 'advise' arrives before any transfers just to tell us that a postcopy |
| * *might* happen - it might be skipped if precopy transferred everything |
| * quickly. |
| */ |
| static int loadvm_postcopy_handle_advise(MigrationIncomingState *mis) |
| { |
| PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_ADVISE); |
| uint64_t remote_pagesize_summary, local_pagesize_summary, remote_tps; |
| |
| trace_loadvm_postcopy_handle_advise(); |
| if (ps != POSTCOPY_INCOMING_NONE) { |
| error_report("CMD_POSTCOPY_ADVISE in wrong postcopy state (%d)", ps); |
| return -1; |
| } |
| |
| if (!postcopy_ram_supported_by_host()) { |
| postcopy_state_set(POSTCOPY_INCOMING_NONE); |
| return -1; |
| } |
| |
| remote_pagesize_summary = qemu_get_be64(mis->from_src_file); |
| local_pagesize_summary = ram_pagesize_summary(); |
| |
| if (remote_pagesize_summary != local_pagesize_summary) { |
| /* |
| * This detects two potential causes of mismatch: |
| * a) A mismatch in host page sizes |
| * Some combinations of mismatch are probably possible but it gets |
| * a bit more complicated. In particular we need to place whole |
| * host pages on the dest at once, and we need to ensure that we |
| * handle dirtying to make sure we never end up sending part of |
| * a hostpage on it's own. |
| * b) The use of different huge page sizes on source/destination |
| * a more fine grain test is performed during RAM block migration |
| * but this test here causes a nice early clear failure, and |
| * also fails when passed to an older qemu that doesn't |
| * do huge pages. |
| */ |
| error_report("Postcopy needs matching RAM page sizes (s=%" PRIx64 |
| " d=%" PRIx64 ")", |
| remote_pagesize_summary, local_pagesize_summary); |
| return -1; |
| } |
| |
| remote_tps = qemu_get_be64(mis->from_src_file); |
| if (remote_tps != qemu_target_page_size()) { |
| /* |
| * Again, some differences could be dealt with, but for now keep it |
| * simple. |
| */ |
| error_report("Postcopy needs matching target page sizes (s=%d d=%zd)", |
| (int)remote_tps, qemu_target_page_size()); |
| return -1; |
| } |
| |
| if (ram_postcopy_incoming_init(mis)) { |
| return -1; |
| } |
| |
| postcopy_state_set(POSTCOPY_INCOMING_ADVISE); |
| |
| return 0; |
| } |
| |
| /* After postcopy we will be told to throw some pages away since they're |
| * dirty and will have to be demand fetched. Must happen before CPU is |
| * started. |
| * There can be 0..many of these messages, each encoding multiple pages. |
| */ |
| static int loadvm_postcopy_ram_handle_discard(MigrationIncomingState *mis, |
| uint16_t len) |
| { |
| int tmp; |
| char ramid[256]; |
| PostcopyState ps = postcopy_state_get(); |
| |
| trace_loadvm_postcopy_ram_handle_discard(); |
| |
| switch (ps) { |
| case POSTCOPY_INCOMING_ADVISE: |
| /* 1st discard */ |
| tmp = postcopy_ram_prepare_discard(mis); |
| if (tmp) { |
| return tmp; |
| } |
| break; |
| |
| case POSTCOPY_INCOMING_DISCARD: |
| /* Expected state */ |
| break; |
| |
| default: |
| error_report("CMD_POSTCOPY_RAM_DISCARD in wrong postcopy state (%d)", |
| ps); |
| return -1; |
| } |
| /* We're expecting a |
| * Version (0) |
| * a RAM ID string (length byte, name, 0 term) |
| * then at least 1 16 byte chunk |
| */ |
| if (len < (1 + 1 + 1 + 1 + 2 * 8)) { |
| error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); |
| return -1; |
| } |
| |
| tmp = qemu_get_byte(mis->from_src_file); |
| if (tmp != postcopy_ram_discard_version) { |
| error_report("CMD_POSTCOPY_RAM_DISCARD invalid version (%d)", tmp); |
| return -1; |
| } |
| |
| if (!qemu_get_counted_string(mis->from_src_file, ramid)) { |
| error_report("CMD_POSTCOPY_RAM_DISCARD Failed to read RAMBlock ID"); |
| return -1; |
| } |
| tmp = qemu_get_byte(mis->from_src_file); |
| if (tmp != 0) { |
| error_report("CMD_POSTCOPY_RAM_DISCARD missing nil (%d)", tmp); |
| return -1; |
| } |
| |
| len -= 3 + strlen(ramid); |
| if (len % 16) { |
| error_report("CMD_POSTCOPY_RAM_DISCARD invalid length (%d)", len); |
| return -1; |
| } |
| trace_loadvm_postcopy_ram_handle_discard_header(ramid, len); |
| while (len) { |
| uint64_t start_addr, block_length; |
| start_addr = qemu_get_be64(mis->from_src_file); |
| block_length = qemu_get_be64(mis->from_src_file); |
| |
| len -= 16; |
| int ret = ram_discard_range(ramid, start_addr, block_length); |
| if (ret) { |
| return ret; |
| } |
| } |
| trace_loadvm_postcopy_ram_handle_discard_end(); |
| |
| return 0; |
| } |
| |
| /* |
| * Triggered by a postcopy_listen command; this thread takes over reading |
| * the input stream, leaving the main thread free to carry on loading the rest |
| * of the device state (from RAM). |
| * (TODO:This could do with being in a postcopy file - but there again it's |
| * just another input loop, not that postcopy specific) |
| */ |
| static void *postcopy_ram_listen_thread(void *opaque) |
| { |
| QEMUFile *f = opaque; |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| int load_res; |
| |
| migrate_set_state(&mis->state, MIGRATION_STATUS_ACTIVE, |
| MIGRATION_STATUS_POSTCOPY_ACTIVE); |
| qemu_sem_post(&mis->listen_thread_sem); |
| trace_postcopy_ram_listen_thread_start(); |
| |
| /* |
| * Because we're a thread and not a coroutine we can't yield |
| * in qemu_file, and thus we must be blocking now. |
| */ |
| qemu_file_set_blocking(f, true); |
| load_res = qemu_loadvm_state_main(f, mis); |
| /* And non-blocking again so we don't block in any cleanup */ |
| qemu_file_set_blocking(f, false); |
| |
| trace_postcopy_ram_listen_thread_exit(); |
| if (load_res < 0) { |
| error_report("%s: loadvm failed: %d", __func__, load_res); |
| qemu_file_set_error(f, load_res); |
| migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
| MIGRATION_STATUS_FAILED); |
| } else { |
| /* |
| * This looks good, but it's possible that the device loading in the |
| * main thread hasn't finished yet, and so we might not be in 'RUN' |
| * state yet; wait for the end of the main thread. |
| */ |
| qemu_event_wait(&mis->main_thread_load_event); |
| } |
| postcopy_ram_incoming_cleanup(mis); |
| |
| if (load_res < 0) { |
| /* |
| * If something went wrong then we have a bad state so exit; |
| * depending how far we got it might be possible at this point |
| * to leave the guest running and fire MCEs for pages that never |
| * arrived as a desperate recovery step. |
| */ |
| exit(EXIT_FAILURE); |
| } |
| |
| migrate_set_state(&mis->state, MIGRATION_STATUS_POSTCOPY_ACTIVE, |
| MIGRATION_STATUS_COMPLETED); |
| /* |
| * If everything has worked fine, then the main thread has waited |
| * for us to start, and we're the last use of the mis. |
| * (If something broke then qemu will have to exit anyway since it's |
| * got a bad migration state). |
| */ |
| migration_incoming_state_destroy(); |
| |
| |
| return NULL; |
| } |
| |
| /* After this message we must be able to immediately receive postcopy data */ |
| static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis) |
| { |
| PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_LISTENING); |
| trace_loadvm_postcopy_handle_listen(); |
| if (ps != POSTCOPY_INCOMING_ADVISE && ps != POSTCOPY_INCOMING_DISCARD) { |
| error_report("CMD_POSTCOPY_LISTEN in wrong postcopy state (%d)", ps); |
| return -1; |
| } |
| if (ps == POSTCOPY_INCOMING_ADVISE) { |
| /* |
| * A rare case, we entered listen without having to do any discards, |
| * so do the setup that's normally done at the time of the 1st discard. |
| */ |
| postcopy_ram_prepare_discard(mis); |
| } |
| |
| /* |
| * Sensitise RAM - can now generate requests for blocks that don't exist |
| * However, at this point the CPU shouldn't be running, and the IO |
| * shouldn't be doing anything yet so don't actually expect requests |
| */ |
| if (postcopy_ram_enable_notify(mis)) { |
| return -1; |
| } |
| |
| if (mis->have_listen_thread) { |
| error_report("CMD_POSTCOPY_RAM_LISTEN already has a listen thread"); |
| return -1; |
| } |
| |
| mis->have_listen_thread = true; |
| /* Start up the listening thread and wait for it to signal ready */ |
| qemu_sem_init(&mis->listen_thread_sem, 0); |
| qemu_thread_create(&mis->listen_thread, "postcopy/listen", |
| postcopy_ram_listen_thread, mis->from_src_file, |
| QEMU_THREAD_DETACHED); |
| qemu_sem_wait(&mis->listen_thread_sem); |
| qemu_sem_destroy(&mis->listen_thread_sem); |
| |
| return 0; |
| } |
| |
| |
| typedef struct { |
| QEMUBH *bh; |
| } HandleRunBhData; |
| |
| static void loadvm_postcopy_handle_run_bh(void *opaque) |
| { |
| Error *local_err = NULL; |
| HandleRunBhData *data = opaque; |
| |
| /* TODO we should move all of this lot into postcopy_ram.c or a shared code |
| * in migration.c |
| */ |
| cpu_synchronize_all_post_init(); |
| |
| qemu_announce_self(); |
| |
| /* Make sure all file formats flush their mutable metadata. |
| * If we get an error here, just don't restart the VM yet. */ |
| bdrv_invalidate_cache_all(&local_err); |
| if (local_err) { |
| error_report_err(local_err); |
| local_err = NULL; |
| autostart = false; |
| } |
| |
| trace_loadvm_postcopy_handle_run_cpu_sync(); |
| cpu_synchronize_all_post_init(); |
| |
| trace_loadvm_postcopy_handle_run_vmstart(); |
| |
| if (autostart) { |
| /* Hold onto your hats, starting the CPU */ |
| vm_start(); |
| } else { |
| /* leave it paused and let management decide when to start the CPU */ |
| runstate_set(RUN_STATE_PAUSED); |
| } |
| |
| qemu_bh_delete(data->bh); |
| g_free(data); |
| } |
| |
| /* After all discards we can start running and asking for pages */ |
| static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) |
| { |
| PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_RUNNING); |
| HandleRunBhData *data; |
| |
| trace_loadvm_postcopy_handle_run(); |
| if (ps != POSTCOPY_INCOMING_LISTENING) { |
| error_report("CMD_POSTCOPY_RUN in wrong postcopy state (%d)", ps); |
| return -1; |
| } |
| |
| data = g_new(HandleRunBhData, 1); |
| data->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, data); |
| qemu_bh_schedule(data->bh); |
| |
| /* We need to finish reading the stream from the package |
| * and also stop reading anything more from the stream that loaded the |
| * package (since it's now being read by the listener thread). |
| * LOADVM_QUIT will quit all the layers of nested loadvm loops. |
| */ |
| return LOADVM_QUIT; |
| } |
| |
| /** |
| * Immediately following this command is a blob of data containing an embedded |
| * chunk of migration stream; read it and load it. |
| * |
| * @mis: Incoming state |
| * @length: Length of packaged data to read |
| * |
| * Returns: Negative values on error |
| * |
| */ |
| static int loadvm_handle_cmd_packaged(MigrationIncomingState *mis) |
| { |
| int ret; |
| size_t length; |
| QIOChannelBuffer *bioc; |
| |
| length = qemu_get_be32(mis->from_src_file); |
| trace_loadvm_handle_cmd_packaged(length); |
| |
| if (length > MAX_VM_CMD_PACKAGED_SIZE) { |
| error_report("Unreasonably large packaged state: %zu", length); |
| return -1; |
| } |
| |
| bioc = qio_channel_buffer_new(length); |
| qio_channel_set_name(QIO_CHANNEL(bioc), "migration-loadvm-buffer"); |
| ret = qemu_get_buffer(mis->from_src_file, |
| bioc->data, |
| length); |
| if (ret != length) { |
| object_unref(OBJECT(bioc)); |
| error_report("CMD_PACKAGED: Buffer receive fail ret=%d length=%zu", |
| ret, length); |
| return (ret < 0) ? ret : -EAGAIN; |
| } |
| bioc->usage += length; |
| trace_loadvm_handle_cmd_packaged_received(ret); |
| |
| QEMUFile *packf = qemu_fopen_channel_input(QIO_CHANNEL(bioc)); |
| |
| ret = qemu_loadvm_state_main(packf, mis); |
| trace_loadvm_handle_cmd_packaged_main(ret); |
| qemu_fclose(packf); |
| object_unref(OBJECT(bioc)); |
| |
| return ret; |
| } |
| |
| /* |
| * Process an incoming 'QEMU_VM_COMMAND' |
| * 0 just a normal return |
| * LOADVM_QUIT All good, but exit the loop |
| * <0 Error |
| */ |
| static int loadvm_process_command(QEMUFile *f) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| uint16_t cmd; |
| uint16_t len; |
| uint32_t tmp32; |
| |
| cmd = qemu_get_be16(f); |
| len = qemu_get_be16(f); |
| |
| trace_loadvm_process_command(cmd, len); |
| if (cmd >= MIG_CMD_MAX || cmd == MIG_CMD_INVALID) { |
| error_report("MIG_CMD 0x%x unknown (len 0x%x)", cmd, len); |
| return -EINVAL; |
| } |
| |
| if (mig_cmd_args[cmd].len != -1 && mig_cmd_args[cmd].len != len) { |
| error_report("%s received with bad length - expecting %zu, got %d", |
| mig_cmd_args[cmd].name, |
| (size_t)mig_cmd_args[cmd].len, len); |
| return -ERANGE; |
| } |
| |
| switch (cmd) { |
| case MIG_CMD_OPEN_RETURN_PATH: |
| if (mis->to_src_file) { |
| error_report("CMD_OPEN_RETURN_PATH called when RP already open"); |
| /* Not really a problem, so don't give up */ |
| return 0; |
| } |
| mis->to_src_file = qemu_file_get_return_path(f); |
| if (!mis->to_src_file) { |
| error_report("CMD_OPEN_RETURN_PATH failed"); |
| return -1; |
| } |
| break; |
| |
| case MIG_CMD_PING: |
| tmp32 = qemu_get_be32(f); |
| trace_loadvm_process_command_ping(tmp32); |
| if (!mis->to_src_file) { |
| error_report("CMD_PING (0x%x) received with no return path", |
| tmp32); |
| return -1; |
| } |
| migrate_send_rp_pong(mis, tmp32); |
| break; |
| |
| case MIG_CMD_PACKAGED: |
| return loadvm_handle_cmd_packaged(mis); |
| |
| case MIG_CMD_POSTCOPY_ADVISE: |
| return loadvm_postcopy_handle_advise(mis); |
| |
| case MIG_CMD_POSTCOPY_LISTEN: |
| return loadvm_postcopy_handle_listen(mis); |
| |
| case MIG_CMD_POSTCOPY_RUN: |
| return loadvm_postcopy_handle_run(mis); |
| |
| case MIG_CMD_POSTCOPY_RAM_DISCARD: |
| return loadvm_postcopy_ram_handle_discard(mis, len); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Read a footer off the wire and check that it matches the expected section |
| * |
| * Returns: true if the footer was good |
| * false if there is a problem (and calls error_report to say why) |
| */ |
| static bool check_section_footer(QEMUFile *f, SaveStateEntry *se) |
| { |
| uint8_t read_mark; |
| uint32_t read_section_id; |
| |
| if (skip_section_footers) { |
| /* No footer to check */ |
| return true; |
| } |
| |
| read_mark = qemu_get_byte(f); |
| |
| if (read_mark != QEMU_VM_SECTION_FOOTER) { |
| error_report("Missing section footer for %s", se->idstr); |
| return false; |
| } |
| |
| read_section_id = qemu_get_be32(f); |
| if (read_section_id != se->load_section_id) { |
| error_report("Mismatched section id in footer for %s -" |
| " read 0x%x expected 0x%x", |
| se->idstr, read_section_id, se->load_section_id); |
| return false; |
| } |
| |
| /* All good */ |
| return true; |
| } |
| |
| static int |
| qemu_loadvm_section_start_full(QEMUFile *f, MigrationIncomingState *mis) |
| { |
| uint32_t instance_id, version_id, section_id; |
| SaveStateEntry *se; |
| char idstr[256]; |
| int ret; |
| |
| /* Read section start */ |
| section_id = qemu_get_be32(f); |
| if (!qemu_get_counted_string(f, idstr)) { |
| error_report("Unable to read ID string for section %u", |
| section_id); |
| return -EINVAL; |
| } |
| instance_id = qemu_get_be32(f); |
| version_id = qemu_get_be32(f); |
| |
| trace_qemu_loadvm_state_section_startfull(section_id, idstr, |
| instance_id, version_id); |
| /* Find savevm section */ |
| se = find_se(idstr, instance_id); |
| if (se == NULL) { |
| error_report("Unknown savevm section or instance '%s' %d", |
| idstr, instance_id); |
| return -EINVAL; |
| } |
| |
| /* Validate version */ |
| if (version_id > se->version_id) { |
| error_report("savevm: unsupported version %d for '%s' v%d", |
| version_id, idstr, se->version_id); |
| return -EINVAL; |
| } |
| se->load_version_id = version_id; |
| se->load_section_id = section_id; |
| |
| /* Validate if it is a device's state */ |
| if (xen_enabled() && se->is_ram) { |
| error_report("loadvm: %s RAM loading not allowed on Xen", idstr); |
| return -EINVAL; |
| } |
| |
| ret = vmstate_load(f, se); |
| if (ret < 0) { |
| error_report("error while loading state for instance 0x%x of" |
| " device '%s'", instance_id, idstr); |
| return ret; |
| } |
| if (!check_section_footer(f, se)) { |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| qemu_loadvm_section_part_end(QEMUFile *f, MigrationIncomingState *mis) |
| { |
| uint32_t section_id; |
| SaveStateEntry *se; |
| int ret; |
| |
| section_id = qemu_get_be32(f); |
| |
| trace_qemu_loadvm_state_section_partend(section_id); |
| QTAILQ_FOREACH(se, &savevm_state.handlers, entry) { |
| if (se->load_section_id == section_id) { |
| break; |
| } |
| } |
| if (se == NULL) { |
| error_report("Unknown savevm section %d", section_id); |
| return -EINVAL; |
| } |
| |
| ret = vmstate_load(f, se); |
| if (ret < 0) { |
| error_report("error while loading state section id %d(%s)", |
| section_id, se->idstr); |
| return ret; |
| } |
| if (!check_section_footer(f, se)) { |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int qemu_loadvm_state_main(QEMUFile *f, MigrationIncomingState *mis) |
| { |
| uint8_t section_type; |
| int ret = 0; |
| |
| while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) { |
| ret = 0; |
| trace_qemu_loadvm_state_section(section_type); |
| switch (section_type) { |
| case QEMU_VM_SECTION_START: |
| case QEMU_VM_SECTION_FULL: |
| ret = qemu_loadvm_section_start_full(f, mis); |
| if (ret < 0) { |
| goto out; |
| } |
| break; |
| case QEMU_VM_SECTION_PART: |
| case QEMU_VM_SECTION_END: |
| ret = qemu_loadvm_section_part_end(f, mis); |
| if (ret < 0) { |
| goto out; |
| } |
| break; |
| case QEMU_VM_COMMAND: |
| ret = loadvm_process_command(f); |
| trace_qemu_loadvm_state_section_command(ret); |
| if ((ret < 0) || (ret & LOADVM_QUIT)) { |
| goto out; |
| } |
| break; |
| default: |
| error_report("Unknown savevm section type %d", section_type); |
| ret = -EINVAL; |
| goto out; |
| } |
| } |
| |
| out: |
| if (ret < 0) { |
| qemu_file_set_error(f, ret); |
| } |
| return ret; |
| } |
| |
| int qemu_loadvm_state(QEMUFile *f) |
| { |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| Error *local_err = NULL; |
| unsigned int v; |
| int ret; |
| |
| if (qemu_savevm_state_blocked(&local_err)) { |
| error_report_err(local_err); |
| return -EINVAL; |
| } |
| |
| v = qemu_get_be32(f); |
| if (v != QEMU_VM_FILE_MAGIC) { |
| error_report("Not a migration stream"); |
| return -EINVAL; |
| } |
| |
| v = qemu_get_be32(f); |
| if (v == QEMU_VM_FILE_VERSION_COMPAT) { |
| error_report("SaveVM v2 format is obsolete and don't work anymore"); |
| return -ENOTSUP; |
| } |
| if (v != QEMU_VM_FILE_VERSION) { |
| error_report("Unsupported migration stream version"); |
| return -ENOTSUP; |
| } |
| |
| if (!savevm_state.skip_configuration || enforce_config_section()) { |
| if (qemu_get_byte(f) != QEMU_VM_CONFIGURATION) { |
| error_report("Configuration section missing"); |
| return -EINVAL; |
| } |
| ret = vmstate_load_state(f, &vmstate_configuration, &savevm_state, 0); |
| |
| if (ret) { |
| return ret; |
| } |
| } |
| |
| cpu_synchronize_all_pre_loadvm(); |
| |
| ret = qemu_loadvm_state_main(f, mis); |
| qemu_event_set(&mis->main_thread_load_event); |
| |
| trace_qemu_loadvm_state_post_main(ret); |
| |
| if (mis->have_listen_thread) { |
| /* Listen thread still going, can't clean up yet */ |
| return ret; |
| } |
| |
| if (ret == 0) { |
| ret = qemu_file_get_error(f); |
| } |
| |
| /* |
| * Try to read in the VMDESC section as well, so that dumping tools that |
| * intercept our migration stream have the chance to see it. |
| */ |
| |
| /* We've got to be careful; if we don't read the data and just shut the fd |
| * then the sender can error if we close while it's still sending. |
| * We also mustn't read data that isn't there; some transports (RDMA) |
| * will stall waiting for that data when the source has already closed. |
| */ |
| if (ret == 0 && should_send_vmdesc()) { |
| uint8_t *buf; |
| uint32_t size; |
| uint8_t section_type = qemu_get_byte(f); |
| |
| if (section_type != QEMU_VM_VMDESCRIPTION) { |
| error_report("Expected vmdescription section, but got %d", |
| section_type); |
| /* |
| * It doesn't seem worth failing at this point since |
| * we apparently have an otherwise valid VM state |
| */ |
| } else { |
| buf = g_malloc(0x1000); |
| size = qemu_get_be32(f); |
| |
| while (size > 0) { |
| uint32_t read_chunk = MIN(size, 0x1000); |
| qemu_get_buffer(f, buf, read_chunk); |
| size -= read_chunk; |
| } |
| g_free(buf); |
| } |
| } |
| |
| cpu_synchronize_all_post_init(); |
| |
| return ret; |
| } |
| |
| int save_snapshot(const char *name, Error **errp) |
| { |
| BlockDriverState *bs, *bs1; |
| QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1; |
| int ret = -1; |
| QEMUFile *f; |
| int saved_vm_running; |
| uint64_t vm_state_size; |
| qemu_timeval tv; |
| struct tm tm; |
| AioContext *aio_context; |
| |
| if (!bdrv_all_can_snapshot(&bs)) { |
| error_setg(errp, "Device '%s' is writable but does not support " |
| "snapshots", bdrv_get_device_name(bs)); |
| return ret; |
| } |
| |
| /* Delete old snapshots of the same name */ |
| if (name) { |
| ret = bdrv_all_delete_snapshot(name, &bs1, errp); |
| if (ret < 0) { |
| error_prepend(errp, "Error while deleting snapshot on device " |
| "'%s': ", bdrv_get_device_name(bs1)); |
| return ret; |
| } |
| } |
| |
| bs = bdrv_all_find_vmstate_bs(); |
| if (bs == NULL) { |
| error_setg(errp, "No block device can accept snapshots"); |
| return ret; |
| } |
| aio_context = bdrv_get_aio_context(bs); |
| |
| saved_vm_running = runstate_is_running(); |
| |
| ret = global_state_store(); |
| if (ret) { |
| error_setg(errp, "Error saving global state"); |
| return ret; |
| } |
| vm_stop(RUN_STATE_SAVE_VM); |
| |
| aio_context_acquire(aio_context); |
| |
| memset(sn, 0, sizeof(*sn)); |
| |
| /* fill auxiliary fields */ |
| qemu_gettimeofday(&tv); |
| sn->date_sec = tv.tv_sec; |
| sn->date_nsec = tv.tv_usec * 1000; |
| sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); |
| |
| if (name) { |
| ret = bdrv_snapshot_find(bs, old_sn, name); |
| if (ret >= 0) { |
| pstrcpy(sn->name, sizeof(sn->name), old_sn->name); |
| pstrcpy(sn->id_str, sizeof(sn->id_str), old_sn->id_str); |
| } else { |
| pstrcpy(sn->name, sizeof(sn->name), name); |
| } |
| } else { |
| /* cast below needed for OpenBSD where tv_sec is still 'long' */ |
| localtime_r((const time_t *)&tv.tv_sec, &tm); |
| strftime(sn->name, sizeof(sn->name), "vm-%Y%m%d%H%M%S", &tm); |
| } |
| |
| /* save the VM state */ |
| f = qemu_fopen_bdrv(bs, 1); |
| if (!f) { |
| error_setg(errp, "Could not open VM state file"); |
| goto the_end; |
| } |
| ret = qemu_savevm_state(f, errp); |
| vm_state_size = qemu_ftell(f); |
| qemu_fclose(f); |
| if (ret < 0) { |
| goto the_end; |
| } |
| |
| ret = bdrv_all_create_snapshot(sn, bs, vm_state_size, &bs); |
| if (ret < 0) { |
| error_setg(errp, "Error while creating snapshot on '%s'", |
| bdrv_get_device_name(bs)); |
| goto the_end; |
| } |
| |
| ret = 0; |
| |
| the_end: |
| aio_context_release(aio_context); |
| if (saved_vm_running) { |
| vm_start(); |
| } |
| return ret; |
| } |
| |
| void qmp_xen_save_devices_state(const char *filename, Error **errp) |
| { |
| QEMUFile *f; |
| QIOChannelFile *ioc; |
| int saved_vm_running; |
| int ret; |
| |
| saved_vm_running = runstate_is_running(); |
| vm_stop(RUN_STATE_SAVE_VM); |
| global_state_store_running(); |
| |
| ioc = qio_channel_file_new_path(filename, O_WRONLY | O_CREAT, 0660, errp); |
| if (!ioc) { |
| goto the_end; |
| } |
| qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-save-state"); |
| f = qemu_fopen_channel_output(QIO_CHANNEL(ioc)); |
| ret = qemu_save_device_state(f); |
| qemu_fclose(f); |
| if (ret < 0) { |
| error_setg(errp, QERR_IO_ERROR); |
| } |
| |
| the_end: |
| if (saved_vm_running) { |
| vm_start(); |
| } |
| } |
| |
| void qmp_xen_load_devices_state(const char *filename, Error **errp) |
| { |
| QEMUFile *f; |
| QIOChannelFile *ioc; |
| int ret; |
| |
| /* Guest must be paused before loading the device state; the RAM state |
| * will already have been loaded by xc |
| */ |
| if (runstate_is_running()) { |
| error_setg(errp, "Cannot update device state while vm is running"); |
| return; |
| } |
| vm_stop(RUN_STATE_RESTORE_VM); |
| |
| ioc = qio_channel_file_new_path(filename, O_RDONLY | O_BINARY, 0, errp); |
| if (!ioc) { |
| return; |
| } |
| qio_channel_set_name(QIO_CHANNEL(ioc), "migration-xen-load-state"); |
| f = qemu_fopen_channel_input(QIO_CHANNEL(ioc)); |
| |
| ret = qemu_loadvm_state(f); |
| qemu_fclose(f); |
| if (ret < 0) { |
| error_setg(errp, QERR_IO_ERROR); |
| } |
| migration_incoming_state_destroy(); |
| } |
| |
| int load_snapshot(const char *name, Error **errp) |
| { |
| BlockDriverState *bs, *bs_vm_state; |
| QEMUSnapshotInfo sn; |
| QEMUFile *f; |
| int ret; |
| AioContext *aio_context; |
| MigrationIncomingState *mis = migration_incoming_get_current(); |
| |
| if (!bdrv_all_can_snapshot(&bs)) { |
| error_setg(errp, |
| "Device '%s' is writable but does not support snapshots", |
| bdrv_get_device_name(bs)); |
| return -ENOTSUP; |
| } |
| ret = bdrv_all_find_snapshot(name, &bs); |
| if (ret < 0) { |
| error_setg(errp, |
| "Device '%s' does not have the requested snapshot '%s'", |
| bdrv_get_device_name(bs), name); |
| return ret; |
| } |
| |
| bs_vm_state = bdrv_all_find_vmstate_bs(); |
| if (!bs_vm_state) { |
| error_setg(errp, "No block device supports snapshots"); |
| return -ENOTSUP; |
| } |
| aio_context = bdrv_get_aio_context(bs_vm_state); |
| |
| /* Don't even try to load empty VM states */ |
| aio_context_acquire(aio_context); |
| ret = bdrv_snapshot_find(bs_vm_state, &sn, name); |
| aio_context_release(aio_context); |
| if (ret < 0) { |
| return ret; |
| } else if (sn.vm_state_size == 0) { |
| error_setg(errp, "This is a disk-only snapshot. Revert to it " |
| " offline using qemu-img"); |
| return -EINVAL; |
| } |
| |
| /* Flush all IO requests so they don't interfere with the new state. */ |
| bdrv_drain_all(); |
| |
| ret = bdrv_all_goto_snapshot(name, &bs); |
| if (ret < 0) { |
| error_setg(errp, "Error %d while activating snapshot '%s' on '%s'", |
| ret, name, bdrv_get_device_name(bs)); |
| return ret; |
| } |
| |
| /* restore the VM state */ |
| f = qemu_fopen_bdrv(bs_vm_state, 0); |
| if (!f) { |
| error_setg(errp, "Could not open VM state file"); |
| return -EINVAL; |
| } |
| |
| qemu_system_reset(SHUTDOWN_CAUSE_NONE); |
| mis->from_src_file = f; |
| |
| aio_context_acquire(aio_context); |
| ret = qemu_loadvm_state(f); |
| aio_context_release(aio_context); |
| |
| migration_incoming_state_destroy(); |
| if (ret < 0) { |
| error_setg(errp, "Error %d while loading VM state", ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev) |
| { |
| qemu_ram_set_idstr(mr->ram_block, |
| memory_region_name(mr), dev); |
| } |
| |
| void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev) |
| { |
| qemu_ram_unset_idstr(mr->ram_block); |
| } |
| |
| void vmstate_register_ram_global(MemoryRegion *mr) |
| { |
| vmstate_register_ram(mr, NULL); |
| } |
| |
| bool vmstate_check_only_migratable(const VMStateDescription *vmsd) |
| { |
| /* check needed if --only-migratable is specified */ |
| if (!only_migratable) { |
| return true; |
| } |
| |
| return !(vmsd && vmsd->unmigratable); |
| } |