mirror of
https://github.com/qemu/qemu.git
synced 2024-12-06 02:03:38 +08:00
ba2b22888c
If an error occurs in bdrv_snapshot_delete_by_id_or_name(), "err" is
freed. If "err" is not set to NULL before calling
bdrv_snapshot_delete_by_id_or_name() again, it will not be updated on
error, and will be freed again.
This can be triggered by starting a VM with at least two drives and then
attempting to delete a non-existent snapshot.
Broken in commit a89d89d
.
Signed-off-by: Chris Spiegel <chris.spiegel@cypherpath.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1412613225-32676-1-git-send-email-chris.spiegel@cypherpath.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
1354 lines
37 KiB
C
1354 lines
37 KiB
C
/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "config-host.h"
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#include "qemu-common.h"
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#include "hw/boards.h"
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#include "hw/hw.h"
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#include "hw/qdev.h"
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#include "net/net.h"
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#include "monitor/monitor.h"
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#include "sysemu/sysemu.h"
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#include "qemu/timer.h"
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#include "audio/audio.h"
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#include "migration/migration.h"
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#include "qemu/sockets.h"
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#include "qemu/queue.h"
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#include "sysemu/cpus.h"
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#include "exec/memory.h"
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#include "qmp-commands.h"
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#include "trace.h"
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#include "qemu/iov.h"
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#include "block/snapshot.h"
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#include "block/qapi.h"
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#ifndef ETH_P_RARP
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#define ETH_P_RARP 0x8035
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#endif
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#define ARP_HTYPE_ETH 0x0001
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#define ARP_PTYPE_IP 0x0800
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#define ARP_OP_REQUEST_REV 0x3
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static int announce_self_create(uint8_t *buf,
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uint8_t *mac_addr)
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{
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/* Ethernet header. */
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memset(buf, 0xff, 6); /* destination MAC addr */
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memcpy(buf + 6, mac_addr, 6); /* source MAC addr */
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*(uint16_t *)(buf + 12) = htons(ETH_P_RARP); /* ethertype */
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/* RARP header. */
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*(uint16_t *)(buf + 14) = htons(ARP_HTYPE_ETH); /* hardware addr space */
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*(uint16_t *)(buf + 16) = htons(ARP_PTYPE_IP); /* protocol addr space */
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*(buf + 18) = 6; /* hardware addr length (ethernet) */
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*(buf + 19) = 4; /* protocol addr length (IPv4) */
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*(uint16_t *)(buf + 20) = htons(ARP_OP_REQUEST_REV); /* opcode */
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memcpy(buf + 22, mac_addr, 6); /* source hw addr */
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memset(buf + 28, 0x00, 4); /* source protocol addr */
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memcpy(buf + 32, mac_addr, 6); /* target hw addr */
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memset(buf + 38, 0x00, 4); /* target protocol addr */
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/* Padding to get up to 60 bytes (ethernet min packet size, minus FCS). */
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memset(buf + 42, 0x00, 18);
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return 60; /* len (FCS will be added by hardware) */
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}
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static void qemu_announce_self_iter(NICState *nic, void *opaque)
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{
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uint8_t buf[60];
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int len;
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trace_qemu_announce_self_iter(qemu_ether_ntoa(&nic->conf->macaddr));
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len = announce_self_create(buf, nic->conf->macaddr.a);
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qemu_send_packet_raw(qemu_get_queue(nic), buf, len);
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}
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static void qemu_announce_self_once(void *opaque)
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{
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static int count = SELF_ANNOUNCE_ROUNDS;
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QEMUTimer *timer = *(QEMUTimer **)opaque;
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qemu_foreach_nic(qemu_announce_self_iter, NULL);
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if (--count) {
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/* delay 50ms, 150ms, 250ms, ... */
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timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) +
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self_announce_delay(count));
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} else {
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timer_del(timer);
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timer_free(timer);
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}
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}
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void qemu_announce_self(void)
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{
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static QEMUTimer *timer;
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timer = timer_new_ms(QEMU_CLOCK_REALTIME, qemu_announce_self_once, &timer);
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qemu_announce_self_once(&timer);
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}
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/***********************************************************/
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/* savevm/loadvm support */
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static ssize_t block_writev_buffer(void *opaque, struct iovec *iov, int iovcnt,
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int64_t pos)
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{
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int ret;
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QEMUIOVector qiov;
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qemu_iovec_init_external(&qiov, iov, iovcnt);
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ret = bdrv_writev_vmstate(opaque, &qiov, pos);
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if (ret < 0) {
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return ret;
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}
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return qiov.size;
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}
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static int block_put_buffer(void *opaque, const uint8_t *buf,
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int64_t pos, int size)
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{
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bdrv_save_vmstate(opaque, buf, pos, size);
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return size;
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}
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static int block_get_buffer(void *opaque, uint8_t *buf, int64_t pos, int size)
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{
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return bdrv_load_vmstate(opaque, buf, pos, size);
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}
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static int bdrv_fclose(void *opaque)
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{
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return bdrv_flush(opaque);
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}
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static const QEMUFileOps bdrv_read_ops = {
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.get_buffer = block_get_buffer,
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.close = bdrv_fclose
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};
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static const QEMUFileOps bdrv_write_ops = {
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.put_buffer = block_put_buffer,
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.writev_buffer = block_writev_buffer,
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.close = bdrv_fclose
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};
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static QEMUFile *qemu_fopen_bdrv(BlockDriverState *bs, int is_writable)
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{
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if (is_writable) {
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return qemu_fopen_ops(bs, &bdrv_write_ops);
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}
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return qemu_fopen_ops(bs, &bdrv_read_ops);
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}
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/* QEMUFile timer support.
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* Not in qemu-file.c to not add qemu-timer.c as dependency to qemu-file.c
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*/
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void timer_put(QEMUFile *f, QEMUTimer *ts)
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{
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uint64_t expire_time;
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expire_time = timer_expire_time_ns(ts);
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qemu_put_be64(f, expire_time);
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}
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void timer_get(QEMUFile *f, QEMUTimer *ts)
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{
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uint64_t expire_time;
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expire_time = qemu_get_be64(f);
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if (expire_time != -1) {
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timer_mod_ns(ts, expire_time);
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} else {
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timer_del(ts);
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}
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}
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/* VMState timer support.
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* Not in vmstate.c to not add qemu-timer.c as dependency to vmstate.c
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*/
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static int get_timer(QEMUFile *f, void *pv, size_t size)
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{
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QEMUTimer *v = pv;
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timer_get(f, v);
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return 0;
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}
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static void put_timer(QEMUFile *f, void *pv, size_t size)
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{
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QEMUTimer *v = pv;
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timer_put(f, v);
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}
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const VMStateInfo vmstate_info_timer = {
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.name = "timer",
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.get = get_timer,
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.put = put_timer,
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};
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typedef struct CompatEntry {
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char idstr[256];
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int instance_id;
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} CompatEntry;
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typedef struct SaveStateEntry {
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QTAILQ_ENTRY(SaveStateEntry) entry;
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char idstr[256];
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int instance_id;
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int alias_id;
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int version_id;
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int section_id;
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SaveVMHandlers *ops;
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const VMStateDescription *vmsd;
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void *opaque;
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CompatEntry *compat;
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int is_ram;
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} SaveStateEntry;
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static QTAILQ_HEAD(savevm_handlers, SaveStateEntry) savevm_handlers =
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QTAILQ_HEAD_INITIALIZER(savevm_handlers);
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static int global_section_id;
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static void dump_vmstate_vmsd(FILE *out_file,
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const VMStateDescription *vmsd, int indent,
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bool is_subsection);
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static void dump_vmstate_vmsf(FILE *out_file, const VMStateField *field,
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int indent)
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{
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fprintf(out_file, "%*s{\n", indent, "");
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indent += 2;
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fprintf(out_file, "%*s\"field\": \"%s\",\n", indent, "", field->name);
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fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
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field->version_id);
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fprintf(out_file, "%*s\"field_exists\": %s,\n", indent, "",
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field->field_exists ? "true" : "false");
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fprintf(out_file, "%*s\"size\": %zu", indent, "", field->size);
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if (field->vmsd != NULL) {
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fprintf(out_file, ",\n");
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dump_vmstate_vmsd(out_file, field->vmsd, indent, false);
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}
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fprintf(out_file, "\n%*s}", indent - 2, "");
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}
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static void dump_vmstate_vmss(FILE *out_file,
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const VMStateSubsection *subsection,
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int indent)
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{
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if (subsection->vmsd != NULL) {
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dump_vmstate_vmsd(out_file, subsection->vmsd, indent, true);
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}
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}
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static void dump_vmstate_vmsd(FILE *out_file,
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const VMStateDescription *vmsd, int indent,
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bool is_subsection)
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{
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if (is_subsection) {
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fprintf(out_file, "%*s{\n", indent, "");
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} else {
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fprintf(out_file, "%*s\"%s\": {\n", indent, "", "Description");
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}
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indent += 2;
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fprintf(out_file, "%*s\"name\": \"%s\",\n", indent, "", vmsd->name);
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fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
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vmsd->version_id);
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fprintf(out_file, "%*s\"minimum_version_id\": %d", indent, "",
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vmsd->minimum_version_id);
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if (vmsd->fields != NULL) {
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const VMStateField *field = vmsd->fields;
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bool first;
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fprintf(out_file, ",\n%*s\"Fields\": [\n", indent, "");
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first = true;
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while (field->name != NULL) {
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if (field->flags & VMS_MUST_EXIST) {
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/* Ignore VMSTATE_VALIDATE bits; these don't get migrated */
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field++;
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continue;
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}
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if (!first) {
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fprintf(out_file, ",\n");
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}
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dump_vmstate_vmsf(out_file, field, indent + 2);
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field++;
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first = false;
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}
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fprintf(out_file, "\n%*s]", indent, "");
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}
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if (vmsd->subsections != NULL) {
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const VMStateSubsection *subsection = vmsd->subsections;
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bool first;
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fprintf(out_file, ",\n%*s\"Subsections\": [\n", indent, "");
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first = true;
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while (subsection->vmsd != NULL) {
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if (!first) {
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fprintf(out_file, ",\n");
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}
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dump_vmstate_vmss(out_file, subsection, indent + 2);
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subsection++;
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first = false;
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}
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fprintf(out_file, "\n%*s]", indent, "");
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}
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fprintf(out_file, "\n%*s}", indent - 2, "");
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}
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static void dump_machine_type(FILE *out_file)
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{
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MachineClass *mc;
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mc = MACHINE_GET_CLASS(current_machine);
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fprintf(out_file, " \"vmschkmachine\": {\n");
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fprintf(out_file, " \"Name\": \"%s\"\n", mc->name);
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fprintf(out_file, " },\n");
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}
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void dump_vmstate_json_to_file(FILE *out_file)
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{
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GSList *list, *elt;
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bool first;
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fprintf(out_file, "{\n");
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dump_machine_type(out_file);
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first = true;
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list = object_class_get_list(TYPE_DEVICE, true);
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for (elt = list; elt; elt = elt->next) {
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DeviceClass *dc = OBJECT_CLASS_CHECK(DeviceClass, elt->data,
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TYPE_DEVICE);
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const char *name;
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int indent = 2;
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if (!dc->vmsd) {
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continue;
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}
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if (!first) {
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fprintf(out_file, ",\n");
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}
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name = object_class_get_name(OBJECT_CLASS(dc));
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fprintf(out_file, "%*s\"%s\": {\n", indent, "", name);
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indent += 2;
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fprintf(out_file, "%*s\"Name\": \"%s\",\n", indent, "", name);
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fprintf(out_file, "%*s\"version_id\": %d,\n", indent, "",
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dc->vmsd->version_id);
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fprintf(out_file, "%*s\"minimum_version_id\": %d,\n", indent, "",
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dc->vmsd->minimum_version_id);
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dump_vmstate_vmsd(out_file, dc->vmsd, indent, false);
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fprintf(out_file, "\n%*s}", indent - 2, "");
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first = false;
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}
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fprintf(out_file, "\n}\n");
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fclose(out_file);
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}
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static int calculate_new_instance_id(const char *idstr)
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{
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SaveStateEntry *se;
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int instance_id = 0;
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QTAILQ_FOREACH(se, &savevm_handlers, entry) {
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if (strcmp(idstr, se->idstr) == 0
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&& instance_id <= se->instance_id) {
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instance_id = se->instance_id + 1;
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}
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}
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return instance_id;
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}
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static int calculate_compat_instance_id(const char *idstr)
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{
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SaveStateEntry *se;
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int instance_id = 0;
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QTAILQ_FOREACH(se, &savevm_handlers, entry) {
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if (!se->compat) {
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continue;
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}
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if (strcmp(idstr, se->compat->idstr) == 0
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&& instance_id <= se->compat->instance_id) {
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instance_id = se->compat->instance_id + 1;
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}
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}
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return instance_id;
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}
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/* TODO: Individual devices generally have very little idea about the rest
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of the system, so instance_id should be removed/replaced.
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Meanwhile pass -1 as instance_id if you do not already have a clearly
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distinguishing id for all instances of your device class. */
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int register_savevm_live(DeviceState *dev,
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const char *idstr,
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int instance_id,
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int version_id,
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SaveVMHandlers *ops,
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void *opaque)
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{
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SaveStateEntry *se;
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se = g_malloc0(sizeof(SaveStateEntry));
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se->version_id = version_id;
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se->section_id = global_section_id++;
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se->ops = ops;
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se->opaque = opaque;
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se->vmsd = NULL;
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/* if this is a live_savem then set is_ram */
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if (ops->save_live_setup != NULL) {
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se->is_ram = 1;
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}
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|
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if (dev) {
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char *id = qdev_get_dev_path(dev);
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if (id) {
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pstrcpy(se->idstr, sizeof(se->idstr), id);
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pstrcat(se->idstr, sizeof(se->idstr), "/");
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g_free(id);
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se->compat = g_malloc0(sizeof(CompatEntry));
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pstrcpy(se->compat->idstr, sizeof(se->compat->idstr), idstr);
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se->compat->instance_id = instance_id == -1 ?
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calculate_compat_instance_id(idstr) : instance_id;
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instance_id = -1;
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}
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}
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pstrcat(se->idstr, sizeof(se->idstr), idstr);
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|
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if (instance_id == -1) {
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se->instance_id = calculate_new_instance_id(se->idstr);
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} else {
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se->instance_id = instance_id;
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}
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assert(!se->compat || se->instance_id == 0);
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/* add at the end of list */
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QTAILQ_INSERT_TAIL(&savevm_handlers, se, entry);
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return 0;
|
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}
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|
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int register_savevm(DeviceState *dev,
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const char *idstr,
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int instance_id,
|
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int version_id,
|
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SaveStateHandler *save_state,
|
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LoadStateHandler *load_state,
|
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void *opaque)
|
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{
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SaveVMHandlers *ops = g_malloc0(sizeof(SaveVMHandlers));
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ops->save_state = save_state;
|
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ops->load_state = load_state;
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return register_savevm_live(dev, idstr, instance_id, version_id,
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ops, opaque);
|
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}
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|
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void unregister_savevm(DeviceState *dev, const char *idstr, void *opaque)
|
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{
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SaveStateEntry *se, *new_se;
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char id[256] = "";
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|
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if (dev) {
|
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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(QEMUFile *f, SaveStateEntry *se)
|
|
{
|
|
trace_vmstate_save(se->idstr, se->vmsd ? se->vmsd->name : "(old)");
|
|
if (!se->vmsd) { /* Old style */
|
|
se->ops->save_state(f, se->opaque);
|
|
return;
|
|
}
|
|
vmstate_save_state(f, se->vmsd, se->opaque);
|
|
}
|
|
|
|
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);
|
|
|
|
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;
|
|
}
|
|
|
|
void qemu_savevm_state_complete(QEMUFile *f)
|
|
{
|
|
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);
|
|
if (ret < 0) {
|
|
qemu_file_set_error(f, ret);
|
|
return;
|
|
}
|
|
}
|
|
|
|
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);
|
|
/* 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);
|
|
trace_savevm_section_end(se->idstr, se->section_id);
|
|
}
|
|
|
|
qemu_put_byte(f, QEMU_VM_EOF);
|
|
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)
|
|
{
|
|
int ret;
|
|
MigrationParams params = {
|
|
.blk = 0,
|
|
.shared = 0
|
|
};
|
|
|
|
if (qemu_savevm_state_blocked(NULL)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
qemu_mutex_unlock_iothread();
|
|
qemu_savevm_state_begin(f, ¶ms);
|
|
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();
|
|
}
|
|
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);
|
|
}
|
|
|
|
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;
|
|
uint8_t section_type;
|
|
unsigned int v;
|
|
int ret;
|
|
|
|
if (qemu_savevm_state_blocked(NULL)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
v = qemu_get_be32(f);
|
|
if (v != QEMU_VM_FILE_MAGIC) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
v = qemu_get_be32(f);
|
|
if (v == QEMU_VM_FILE_VERSION_COMPAT) {
|
|
fprintf(stderr, "SaveVM v2 format is obsolete and don't work anymore\n");
|
|
return -ENOTSUP;
|
|
}
|
|
if (v != QEMU_VM_FILE_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;
|
|
|
|
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);
|
|
|
|
/* Find savevm section */
|
|
se = find_se(idstr, instance_id);
|
|
if (se == NULL) {
|
|
fprintf(stderr, "Unknown savevm section or instance '%s' %d\n", idstr, instance_id);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Validate version */
|
|
if (version_id > se->version_id) {
|
|
fprintf(stderr, "savevm: unsupported version %d for '%s' v%d\n",
|
|
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) {
|
|
fprintf(stderr, "qemu: warning: error while loading state for instance 0x%x of device '%s'\n",
|
|
instance_id, idstr);
|
|
goto out;
|
|
}
|
|
break;
|
|
case QEMU_VM_SECTION_PART:
|
|
case QEMU_VM_SECTION_END:
|
|
section_id = qemu_get_be32(f);
|
|
|
|
QLIST_FOREACH(le, &loadvm_handlers, entry) {
|
|
if (le->section_id == section_id) {
|
|
break;
|
|
}
|
|
}
|
|
if (le == NULL) {
|
|
fprintf(stderr, "Unknown savevm section %d\n", section_id);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
ret = vmstate_load(f, le->se, le->version_id);
|
|
if (ret < 0) {
|
|
fprintf(stderr, "qemu: warning: error while loading state section id %d\n",
|
|
section_id);
|
|
goto out;
|
|
}
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown savevm section type %d\n", section_type);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
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) {
|
|
ret = qemu_file_get_error(f);
|
|
}
|
|
|
|
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 do_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");
|
|
|
|
/* 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);
|
|
vm_state_size = qemu_ftell(f);
|
|
qemu_fclose(f);
|
|
if (ret < 0) {
|
|
monitor_printf(mon, "Error %d while writing VM\n", ret);
|
|
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 do_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 do_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);
|
|
}
|