mirror of https://gitee.com/openkylin/qemu.git
143 lines
3.1 KiB
C
143 lines
3.1 KiB
C
/*
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* QEMU live migration via generic fd
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*
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* Copyright Red Hat, Inc. 2009
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*
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* Authors:
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* Chris Lalancette <clalance@redhat.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 "monitor.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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#include "qemu_socket.h"
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//#define DEBUG_MIGRATION_FD
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#ifdef DEBUG_MIGRATION_FD
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#define dprintf(fmt, ...) \
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do { printf("migration-fd: " 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 fd_errno(FdMigrationState *s)
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{
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return errno;
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}
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static int fd_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 fd_close(FdMigrationState *s)
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{
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dprintf("fd_close\n");
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if (s->fd != -1) {
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close(s->fd);
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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 *fd_start_outgoing_migration(Monitor *mon,
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const char *fdname,
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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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s = qemu_mallocz(sizeof(*s));
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s->fd = monitor_get_fd(mon, fdname);
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if (s->fd == -1) {
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dprintf("fd_migration: invalid file descriptor identifier\n");
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goto err_after_alloc;
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}
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if (fcntl(s->fd, F_SETFL, 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->get_error = fd_errno;
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s->write = fd_write;
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s->close = fd_close;
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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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close(s->fd);
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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 fd_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 fd_start_incoming_migration(const char *infd)
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{
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int fd;
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QEMUFile *f;
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dprintf("Attempting to start an incoming migration via fd\n");
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fd = strtol(infd, NULL, 0);
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f = qemu_fdopen(fd, "rb");
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if(f == NULL) {
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dprintf("Unable to apply qemu wrapper to file descriptor\n");
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return -errno;
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}
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qemu_set_fd_handler2(fd, NULL, fd_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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