c163b5cae9
This patch introduces block migration called during live migration. Block are being copied to the destination in an async way. First the code will transfer the whole disk and then transfer all dirty blocks accumulted during the migration. Still need to improve transition from the iterative phase of migration to the end phase. For now transition will take place when all blocks transfered once, all the dirty blocks will be transfered during the end phase (guest is suspended). Changes from v4: - Global variabels moved to a global state structure allocated dynamically. - Minor coding style issues. - Poll block.c for tracking of dirty blocks instead of manage it here. Signed-off-by: Liran Schour <lirans@il.ibm.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
147 lines
3.1 KiB
C
147 lines
3.1 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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* Copyright Dell MessageOne 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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* Charles Duffy <charles_duffy@messageone.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu-common.h"
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#include "qemu_socket.h"
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#include "migration.h"
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#include "qemu-char.h"
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#include "sysemu.h"
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#include "buffered_file.h"
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#include "block.h"
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//#define DEBUG_MIGRATION_EXEC
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#ifdef DEBUG_MIGRATION_EXEC
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#define dprintf(fmt, ...) \
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do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
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#else
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#define dprintf(fmt, ...) \
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do { } while (0)
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#endif
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static int file_errno(FdMigrationState *s)
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{
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return errno;
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}
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static int file_write(FdMigrationState *s, const void * buf, size_t size)
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{
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return write(s->fd, buf, size);
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}
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static int exec_close(FdMigrationState *s)
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{
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dprintf("exec_close\n");
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if (s->opaque) {
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qemu_fclose(s->opaque);
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s->opaque = NULL;
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s->fd = -1;
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}
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return 0;
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}
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MigrationState *exec_start_outgoing_migration(const char *command,
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int64_t bandwidth_limit,
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int detach,
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int blk,
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int inc)
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{
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FdMigrationState *s;
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FILE *f;
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s = qemu_mallocz(sizeof(*s));
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f = popen(command, "w");
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if (f == NULL) {
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dprintf("Unable to popen exec target\n");
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goto err_after_alloc;
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}
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s->fd = fileno(f);
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if (s->fd == -1) {
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dprintf("Unable to retrieve file descriptor for popen'd handle\n");
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goto err_after_open;
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}
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socket_set_nonblock(s->fd);
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s->opaque = qemu_popen(f, "w");
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s->close = exec_close;
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s->get_error = file_errno;
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s->write = file_write;
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s->mig_state.cancel = migrate_fd_cancel;
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s->mig_state.get_status = migrate_fd_get_status;
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s->mig_state.release = migrate_fd_release;
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s->mig_state.blk = blk;
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s->mig_state.shared = inc;
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s->state = MIG_STATE_ACTIVE;
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s->mon_resume = NULL;
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s->bandwidth_limit = bandwidth_limit;
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if (!detach)
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migrate_fd_monitor_suspend(s);
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migrate_fd_connect(s);
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return &s->mig_state;
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err_after_open:
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pclose(f);
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err_after_alloc:
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qemu_free(s);
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return NULL;
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}
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static void exec_accept_incoming_migration(void *opaque)
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{
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QEMUFile *f = opaque;
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int ret;
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ret = qemu_loadvm_state(f);
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if (ret < 0) {
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fprintf(stderr, "load of migration failed\n");
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goto err;
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}
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qemu_announce_self();
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dprintf("successfully loaded vm state\n");
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/* we've successfully migrated, close the fd */
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qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
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if (autostart)
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vm_start();
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err:
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qemu_fclose(f);
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}
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int exec_start_incoming_migration(const char *command)
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{
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QEMUFile *f;
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dprintf("Attempting to start an incoming migration\n");
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f = qemu_popen_cmd(command, "r");
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if(f == NULL) {
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dprintf("Unable to apply qemu wrapper to popen file\n");
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return -errno;
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}
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qemu_set_fd_handler2(qemu_stdio_fd(f), NULL,
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exec_accept_incoming_migration, NULL,
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(void *)(unsigned long)f);
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return 0;
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}
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