root / migration-exec.c @ 3c4cf535
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/*
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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 "console.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 async)
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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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if (fcntl(s->fd, F_SETFD, O_NONBLOCK) == -1) { |
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dprintf("Unable to set nonblocking mode on file descriptor\n");
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goto err_after_open;
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} |
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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->state = MIG_STATE_ACTIVE; |
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s->detach = !async; |
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s->bandwidth_limit = bandwidth_limit; |
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if (s->detach == 1) { |
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dprintf("detaching from monitor\n");
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monitor_suspend(); |
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s->detach = 2;
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} |
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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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int exec_start_incoming_migration(const char *command) |
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{ |
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int ret;
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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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vm_stop(0); /* just in case */ |
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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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vm_start(); |
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qemu_fclose(f); |
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return 0; |
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err:
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qemu_fclose(f); |
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return -errno;
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} |