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authorJuan Quintela <quintela@redhat.com>2015-05-08 12:49:01 +0200
committerJuan Quintela <quintela@redhat.com>2015-06-12 06:42:30 +0200
commitc3049a56d69f1ee7e85b5100ba5d0e3dc69a14f1 (patch)
treed23d1a816403b88692e8064c1120d3dfa103b791 /savevm.c
parent56e93d26b85bac76b93211393163c2ebcdee9481 (diff)
downloadqemu-arm-c3049a56d69f1ee7e85b5100ba5d0e3dc69a14f1.tar.gz
migration: move savevm.c inside migration/
Now, everything is in place. Signed-off-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'savevm.c')
-rw-r--r--savevm.c1435
1 files changed, 0 insertions, 1435 deletions
diff --git a/savevm.c b/savevm.c
deleted file mode 100644
index 3b0e222cb3..0000000000
--- a/savevm.c
+++ /dev/null
@@ -1,1435 +0,0 @@
-/*
- * QEMU System Emulator
- *
- * Copyright (c) 2003-2008 Fabrice Bellard
- *
- * 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 "config-host.h"
-#include "qemu-common.h"
-#include "hw/boards.h"
-#include "hw/hw.h"
-#include "hw/qdev.h"
-#include "net/net.h"
-#include "monitor/monitor.h"
-#include "sysemu/sysemu.h"
-#include "qemu/timer.h"
-#include "audio/audio.h"
-#include "migration/migration.h"
-#include "qemu/sockets.h"
-#include "qemu/queue.h"
-#include "sysemu/cpus.h"
-#include "exec/memory.h"
-#include "qmp-commands.h"
-#include "trace.h"
-#include "qemu/iov.h"
-#include "block/snapshot.h"
-#include "block/qapi.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
-
-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 int block_put_buffer(void *opaque, const uint8_t *buf,
- int64_t pos, int size)
-{
- bdrv_save_vmstate(opaque, buf, pos, size);
- return size;
-}
-
-static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int 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 = {
- .put_buffer = block_put_buffer,
- .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)
-{
- QEMUTimer *v = pv;
- timer_get(f, v);
- return 0;
-}
-
-static void put_timer(QEMUFile *f, void *pv, size_t size)
-{
- QEMUTimer *v = pv;
- timer_put(f, v);
-}
-
-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;
- int section_id;
- SaveVMHandlers *ops;
- const VMStateDescription *vmsd;
- void *opaque;
- CompatEntry *compat;
- int is_ram;
-} SaveStateEntry;
-
-
-static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
- QTAILQ_HEAD_INITIALIZER(savevm_handlers);
-static int global_section_id;
-
-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 VMStateSubsection *subsection,
- int indent)
-{
- if (subsection->vmsd != NULL) {
- dump_vmstate_vmsd(out_file, subsection->vmsd, 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 VMStateSubsection *subsection = vmsd->subsections;
- bool first;
-
- fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, "");
- first = true;
- while (subsection->vmsd != 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_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_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;
-}
-
-/* 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_malloc0(sizeof(SaveStateEntry));
- se->version_id = version_id;
- se->section_id = 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) {
- pstrcpy(se->idstr, sizeof(se->idstr), id);
- pstrcat(se->idstr, sizeof(se->idstr), "/");
- g_free(id);
-
- se->compat = g_malloc0(sizeof(CompatEntry));
- 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);
- /* add at the end of list */
- QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
- return 0;
-}
-
-int register_savevm(DeviceState *dev,
- const char *idstr,
- int instance_id,
- int version_id,
- SaveStateHandler *save_state,
- LoadStateHandler *load_state,
- void *opaque)
-{
- SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
- ops->save_state = save_state;
- ops->load_state = load_state;
- return register_savevm_live(dev, idstr, instance_id, version_id,
- ops, opaque);
-}
-
-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_handlers, entry, new_se) {
- if (strcmp(se->idstr, id) == 0 && se->opaque == opaque) {
- QTAILQ_REMOVE(&savevm_handlers, se, entry);
- if (se->compat) {
- g_free(se->compat);
- }
- g_free(se->ops);
- 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)
-{
- 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_malloc0(sizeof(SaveStateEntry));
- se->version_id = vmsd->version_id;
- se->section_id = 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) {
- pstrcpy(se->idstr, sizeof(se->idstr), id);
- pstrcat(se->idstr, sizeof(se->idstr), "/");
- g_free(id);
-
- se->compat = g_malloc0(sizeof(CompatEntry));
- 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);
- /* add at the end of list */
- QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
- return 0;
-}
-
-void vmstate_unregister(DeviceState *dev, const VMStateDescription *vmsd,
- void *opaque)
-{
- SaveStateEntry *se, *new_se;
-
- QTAILQ_FOREACH_SAFE(se, &savevm_handlers, entry, new_se) {
- if (se->vmsd == vmsd && se->opaque == opaque) {
- QTAILQ_REMOVE(&savevm_handlers, se, entry);
- if (se->compat) {
- g_free(se->compat);
- }
- g_free(se);
- }
- }
-}
-
-static int vmstate_load(QEMUFile *f, SaveStateEntry *se, int version_id)
-{
- trace_vmstate_load(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
- if (!se->vmsd) { /* Old style */
- return se->ops->load_state(f, se->opaque, version_id);
- }
- return vmstate_load_state(f, se->vmsd, se->opaque, 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);
-}
-
-bool qemu_savevm_state_blocked(Error **errp)
-{
- SaveStateEntry *se;
-
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- if (se->vmsd && se->vmsd->unmigratable) {
- error_setg(errp, "State blocked by non-migratable device '%s'",
- se->idstr);
- return true;
- }
- }
- return false;
-}
-
-void qemu_savevm_state_begin(QEMUFile *f,
- const MigrationParams *params)
-{
- SaveStateEntry *se;
- int ret;
-
- trace_savevm_state_begin();
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- if (!se->ops || !se->ops->set_params) {
- continue;
- }
- se->ops->set_params(params, se->opaque);
- }
-
- qemu_put_be32(f, QEMU_VM_FILE_MAGIC);
- qemu_put_be32(f, QEMU_VM_FILE_VERSION);
-
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- int len;
-
- if (!se->ops || !se->ops->save_live_setup) {
- continue;
- }
- if (se->ops && se->ops->is_active) {
- if (!se->ops->is_active(se->opaque)) {
- continue;
- }
- }
- /* Section type */
- qemu_put_byte(f, QEMU_VM_SECTION_START);
- qemu_put_be32(f, se->section_id);
-
- /* ID string */
- 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);
-
- ret = se->ops->save_live_setup(f, se->opaque);
- 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)
-{
- SaveStateEntry *se;
- int ret = 1;
-
- trace_savevm_state_iterate();
- QTAILQ_FOREACH(se, &savevm_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;
- }
- }
- if (qemu_file_rate_limit(f)) {
- return 0;
- }
- trace_savevm_section_start(se->idstr, se->section_id);
- /* Section type */
- qemu_put_byte(f, QEMU_VM_SECTION_PART);
- qemu_put_be32(f, se->section_id);
-
- ret = se->ops->save_live_iterate(f, se->opaque);
- trace_savevm_section_end(se->idstr, se->section_id, ret);
-
- 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());
- return !machine->suppress_vmdesc;
-}
-
-void qemu_savevm_state_complete(QEMUFile *f)
-{
- QJSON *vmdesc;
- int vmdesc_len;
- SaveStateEntry *se;
- int ret;
-
- trace_savevm_state_complete();
-
- cpu_synchronize_all_states();
-
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- if (!se->ops || !se->ops->save_live_complete) {
- 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(f, se->opaque);
- trace_savevm_section_end(se->idstr, se->section_id, ret);
- if (ret < 0) {
- qemu_file_set_error(f, ret);
- return;
- }
- }
-
- vmdesc = qjson_new();
- json_prop_int(vmdesc, "page_size", TARGET_PAGE_SIZE);
- json_start_array(vmdesc, "devices");
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- int len;
-
- if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
- 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);
-
- /* Section type */
- qemu_put_byte(f, QEMU_VM_SECTION_FULL);
- qemu_put_be32(f, se->section_id);
-
- /* ID string */
- 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);
-
- vmstate_save(f, se, vmdesc);
-
- json_end_object(vmdesc);
- trace_savevm_section_end(se->idstr, se->section_id, 0);
- }
-
- 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);
- }
- object_unref(OBJECT(vmdesc));
-
- qemu_fflush(f);
-}
-
-uint64_t qemu_savevm_state_pending(QEMUFile *f, uint64_t max_size)
-{
- SaveStateEntry *se;
- uint64_t ret = 0;
-
- QTAILQ_FOREACH(se, &savevm_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;
- }
- }
- ret += se->ops->save_live_pending(f, se->opaque, max_size);
- }
- return ret;
-}
-
-void qemu_savevm_state_cancel(void)
-{
- SaveStateEntry *se;
-
- trace_savevm_state_cancel();
- QTAILQ_FOREACH(se, &savevm_handlers, entry) {
- if (se->ops && se->ops->cancel) {
- se->ops->cancel(se->opaque);
- }
- }
-}
-
-static int qemu_savevm_state(QEMUFile *f, Error **errp)
-{
- int ret;
- MigrationParams params = {
- .blk = 0,
- .shared = 0
- };
-
- if (qemu_savevm_state_blocked(errp)) {
- return -EINVAL;
- }
-
- qemu_mutex_unlock_iothread();
- qemu_savevm_state_begin(f, &params);
- qemu_mutex_lock_iothread();
-
- while (qemu_file_get_error(f) == 0) {
- if (qemu_savevm_state_iterate(f) > 0) {
- break;
- }
- }
-
- ret = qemu_file_get_error(f);
- if (ret == 0) {
- qemu_savevm_state_complete(f);
- ret = qemu_file_get_error(f);
- }
- if (ret != 0) {
- qemu_savevm_state_cancel();
- error_setg_errno(errp, -ret, "Error while writing VM state");
- }
- 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_handlers, entry) {
- int len;
-
- if (se->is_ram) {
- continue;
- }
- if ((!se->ops || !se->ops->save_state) && !se->vmsd) {
- continue;
- }
-
- /* Section type */
- qemu_put_byte(f, QEMU_VM_SECTION_FULL);
- qemu_put_be32(f, se->section_id);
-
- /* ID string */
- 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);
-
- vmstate_save(f, se, NULL);
- }
-
- 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_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;
-}
-
-typedef struct LoadStateEntry {
- QLIST_ENTRY(LoadStateEntry) entry;
- SaveStateEntry *se;
- int section_id;
- int version_id;
-} LoadStateEntry;
-
-int qemu_loadvm_state(QEMUFile *f)
-{
- QLIST_HEAD(, LoadStateEntry) loadvm_handlers =
- QLIST_HEAD_INITIALIZER(loadvm_handlers);
- LoadStateEntry *le, *new_le;
- Error *local_err = NULL;
- uint8_t section_type;
- unsigned int v;
- int ret;
- int file_error_after_eof = -1;
-
- 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;
- }
-
- while ((section_type = qemu_get_byte(f)) != QEMU_VM_EOF) {
- uint32_t instance_id, version_id, section_id;
- SaveStateEntry *se;
- char idstr[257];
- int len;
-
- trace_qemu_loadvm_state_section(section_type);
- switch (section_type) {
- case QEMU_VM_SECTION_START:
- case QEMU_VM_SECTION_FULL:
- /* Read section start */
- section_id = qemu_get_be32(f);
- len = qemu_get_byte(f);
- qemu_get_buffer(f, (uint8_t *)idstr, len);
- idstr[len] = 0;
- 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);
- ret = -EINVAL;
- goto out;
- }
-
- /* Validate version */
- if (version_id > se->version_id) {
- error_report("savevm: unsupported version %d for '%s' v%d",
- version_id, idstr, se->version_id);
- ret = -EINVAL;
- goto out;
- }
-
- /* Add entry */
- le = g_malloc0(sizeof(*le));
-
- le->se = se;
- le->section_id = section_id;
- le->version_id = version_id;
- QLIST_INSERT_HEAD(&loadvm_handlers, le, entry);
-
- ret = vmstate_load(f, le->se, le->version_id);
- if (ret < 0) {
- error_report("error while loading state for instance 0x%x of"
- " device '%s'", instance_id, idstr);
- goto out;
- }
- break;
- case QEMU_VM_SECTION_PART:
- case QEMU_VM_SECTION_END:
- section_id = qemu_get_be32(f);
-
- trace_qemu_loadvm_state_section_partend(section_id);
- QLIST_FOREACH(le, &loadvm_handlers, entry) {
- if (le->section_id == section_id) {
- break;
- }
- }
- if (le == NULL) {
- error_report("Unknown savevm section %d", section_id);
- ret = -EINVAL;
- goto out;
- }
-
- ret = vmstate_load(f, le->se, le->version_id);
- if (ret < 0) {
- error_report("error while loading state section id %d(%s)",
- section_id, le->se->idstr);
- goto out;
- }
- break;
- default:
- error_report("Unknown savevm section type %d", section_type);
- ret = -EINVAL;
- goto out;
- }
- }
-
- file_error_after_eof = 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.
- */
- if (qemu_get_byte(f) == QEMU_VM_VMDESCRIPTION) {
- uint32_t size = qemu_get_be32(f);
- uint8_t *buf = g_malloc(0x1000);
-
- 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();
-
- ret = 0;
-
-out:
- QLIST_FOREACH_SAFE(le, &loadvm_handlers, entry, new_le) {
- QLIST_REMOVE(le, entry);
- g_free(le);
- }
-
- if (ret == 0) {
- /* We may not have a VMDESC section, so ignore relative errors */
- ret = file_error_after_eof;
- }
-
- return ret;
-}
-
-static BlockDriverState *find_vmstate_bs(void)
-{
- BlockDriverState *bs = NULL;
- while ((bs = bdrv_next(bs))) {
- if (bdrv_can_snapshot(bs)) {
- return bs;
- }
- }
- return NULL;
-}
-
-/*
- * Deletes snapshots of a given name in all opened images.
- */
-static int del_existing_snapshots(Monitor *mon, const char *name)
-{
- BlockDriverState *bs;
- QEMUSnapshotInfo sn1, *snapshot = &sn1;
- Error *err = NULL;
-
- bs = NULL;
- while ((bs = bdrv_next(bs))) {
- if (bdrv_can_snapshot(bs) &&
- bdrv_snapshot_find(bs, snapshot, name) >= 0) {
- bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
- if (err) {
- monitor_printf(mon,
- "Error while deleting snapshot on device '%s':"
- " %s\n",
- bdrv_get_device_name(bs),
- error_get_pretty(err));
- error_free(err);
- return -1;
- }
- }
- }
-
- return 0;
-}
-
-void hmp_savevm(Monitor *mon, const QDict *qdict)
-{
- BlockDriverState *bs, *bs1;
- QEMUSnapshotInfo sn1, *sn = &sn1, old_sn1, *old_sn = &old_sn1;
- int ret;
- QEMUFile *f;
- int saved_vm_running;
- uint64_t vm_state_size;
- qemu_timeval tv;
- struct tm tm;
- const char *name = qdict_get_try_str(qdict, "name");
- Error *local_err = NULL;
-
- /* Verify if there is a device that doesn't support snapshots and is writable */
- bs = NULL;
- while ((bs = bdrv_next(bs))) {
-
- if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
- continue;
- }
-
- if (!bdrv_can_snapshot(bs)) {
- monitor_printf(mon, "Device '%s' is writable but does not support snapshots.\n",
- bdrv_get_device_name(bs));
- return;
- }
- }
-
- bs = find_vmstate_bs();
- if (!bs) {
- monitor_printf(mon, "No block device can accept snapshots\n");
- return;
- }
-
- saved_vm_running = runstate_is_running();
- vm_stop(RUN_STATE_SAVE_VM);
-
- 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);
- }
-
- /* Delete old snapshots of the same name */
- if (name && del_existing_snapshots(mon, name) < 0) {
- goto the_end;
- }
-
- /* save the VM state */
- f = qemu_fopen_bdrv(bs, 1);
- if (!f) {
- monitor_printf(mon, "Could not open VM state file\n");
- goto the_end;
- }
- ret = qemu_savevm_state(f, &local_err);
- vm_state_size = qemu_ftell(f);
- qemu_fclose(f);
- if (ret < 0) {
- monitor_printf(mon, "%s\n", error_get_pretty(local_err));
- error_free(local_err);
- goto the_end;
- }
-
- /* create the snapshots */
-
- bs1 = NULL;
- while ((bs1 = bdrv_next(bs1))) {
- if (bdrv_can_snapshot(bs1)) {
- /* Write VM state size only to the image that contains the state */
- sn->vm_state_size = (bs == bs1 ? vm_state_size : 0);
- ret = bdrv_snapshot_create(bs1, sn);
- if (ret < 0) {
- monitor_printf(mon, "Error while creating snapshot on '%s'\n",
- bdrv_get_device_name(bs1));
- }
- }
- }
-
- the_end:
- if (saved_vm_running) {
- vm_start();
- }
-}
-
-void qmp_xen_save_devices_state(const char *filename, Error **errp)
-{
- QEMUFile *f;
- int saved_vm_running;
- int ret;
-
- saved_vm_running = runstate_is_running();
- vm_stop(RUN_STATE_SAVE_VM);
-
- f = qemu_fopen(filename, "wb");
- if (!f) {
- error_setg_file_open(errp, errno, filename);
- goto the_end;
- }
- ret = qemu_save_device_state(f);
- qemu_fclose(f);
- if (ret < 0) {
- error_set(errp, QERR_IO_ERROR);
- }
-
- the_end:
- if (saved_vm_running) {
- vm_start();
- }
-}
-
-int load_vmstate(const char *name)
-{
- BlockDriverState *bs, *bs_vm_state;
- QEMUSnapshotInfo sn;
- QEMUFile *f;
- int ret;
-
- bs_vm_state = find_vmstate_bs();
- if (!bs_vm_state) {
- error_report("No block device supports snapshots");
- return -ENOTSUP;
- }
-
- /* Don't even try to load empty VM states */
- ret = bdrv_snapshot_find(bs_vm_state, &sn, name);
- if (ret < 0) {
- return ret;
- } else if (sn.vm_state_size == 0) {
- error_report("This is a disk-only snapshot. Revert to it offline "
- "using qemu-img.");
- return -EINVAL;
- }
-
- /* Verify if there is any device that doesn't support snapshots and is
- writable and check if the requested snapshot is available too. */
- bs = NULL;
- while ((bs = bdrv_next(bs))) {
-
- if (!bdrv_is_inserted(bs) || bdrv_is_read_only(bs)) {
- continue;
- }
-
- if (!bdrv_can_snapshot(bs)) {
- error_report("Device '%s' is writable but does not support snapshots.",
- bdrv_get_device_name(bs));
- return -ENOTSUP;
- }
-
- ret = bdrv_snapshot_find(bs, &sn, name);
- if (ret < 0) {
- error_report("Device '%s' does not have the requested snapshot '%s'",
- bdrv_get_device_name(bs), name);
- return ret;
- }
- }
-
- /* Flush all IO requests so they don't interfere with the new state. */
- bdrv_drain_all();
-
- bs = NULL;
- while ((bs = bdrv_next(bs))) {
- if (bdrv_can_snapshot(bs)) {
- ret = bdrv_snapshot_goto(bs, name);
- if (ret < 0) {
- error_report("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_report("Could not open VM state file");
- return -EINVAL;
- }
-
- qemu_system_reset(VMRESET_SILENT);
- ret = qemu_loadvm_state(f);
-
- qemu_fclose(f);
- if (ret < 0) {
- error_report("Error %d while loading VM state", ret);
- return ret;
- }
-
- return 0;
-}
-
-void hmp_delvm(Monitor *mon, const QDict *qdict)
-{
- BlockDriverState *bs;
- Error *err;
- const char *name = qdict_get_str(qdict, "name");
-
- if (!find_vmstate_bs()) {
- monitor_printf(mon, "No block device supports snapshots\n");
- return;
- }
-
- bs = NULL;
- while ((bs = bdrv_next(bs))) {
- if (bdrv_can_snapshot(bs)) {
- err = NULL;
- bdrv_snapshot_delete_by_id_or_name(bs, name, &err);
- if (err) {
- monitor_printf(mon,
- "Error while deleting snapshot on device '%s':"
- " %s\n",
- bdrv_get_device_name(bs),
- error_get_pretty(err));
- error_free(err);
- }
- }
- }
-}
-
-void hmp_info_snapshots(Monitor *mon, const QDict *qdict)
-{
- BlockDriverState *bs, *bs1;
- QEMUSnapshotInfo *sn_tab, *sn, s, *sn_info = &s;
- int nb_sns, i, ret, available;
- int total;
- int *available_snapshots;
-
- bs = find_vmstate_bs();
- if (!bs) {
- monitor_printf(mon, "No available block device supports snapshots\n");
- return;
- }
-
- nb_sns = bdrv_snapshot_list(bs, &sn_tab);
- if (nb_sns < 0) {
- monitor_printf(mon, "bdrv_snapshot_list: error %d\n", nb_sns);
- return;
- }
-
- if (nb_sns == 0) {
- monitor_printf(mon, "There is no snapshot available.\n");
- return;
- }
-
- available_snapshots = g_malloc0(sizeof(int) * nb_sns);
- total = 0;
- for (i = 0; i < nb_sns; i++) {
- sn = &sn_tab[i];
- available = 1;
- bs1 = NULL;
-
- while ((bs1 = bdrv_next(bs1))) {
- if (bdrv_can_snapshot(bs1) && bs1 != bs) {
- ret = bdrv_snapshot_find(bs1, sn_info, sn->id_str);
- if (ret < 0) {
- available = 0;
- break;
- }
- }
- }
-
- if (available) {
- available_snapshots[total] = i;
- total++;
- }
- }
-
- if (total > 0) {
- bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, NULL);
- monitor_printf(mon, "\n");
- for (i = 0; i < total; i++) {
- sn = &sn_tab[available_snapshots[i]];
- bdrv_snapshot_dump((fprintf_function)monitor_printf, mon, sn);
- monitor_printf(mon, "\n");
- }
- } else {
- monitor_printf(mon, "There is no suitable snapshot available\n");
- }
-
- g_free(sn_tab);
- g_free(available_snapshots);
-
-}
-
-void vmstate_register_ram(MemoryRegion *mr, DeviceState *dev)
-{
- qemu_ram_set_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK,
- memory_region_name(mr), dev);
-}
-
-void vmstate_unregister_ram(MemoryRegion *mr, DeviceState *dev)
-{
- qemu_ram_unset_idstr(memory_region_get_ram_addr(mr) & TARGET_PAGE_MASK);
-}
-
-void vmstate_register_ram_global(MemoryRegion *mr)
-{
- vmstate_register_ram(mr, NULL);
-}