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![aliguori](/assets/img/avatar_default.png)
Currently all registered (and activate) monitor terminals work in broadcast mode: Everyone sees what someone else types on some other terminal and what the monitor reports back. This model is broken when you have a management monitor terminal that is automatically operated and some other terminal used for independent guest inspection. Such additional terminals can be multiplexed device channels or a gdb frontend connected to QEMU's stub. Therefore, this patch decouples the buffers and states of all monitor terminals, allowing the user to operate them independently. It finally starts to use the 'mon' parameter that was introduced earlier with the API rework. It also defines the default monitor: the first instantance that has the MONITOR_IS_DEFAULT flag set, and that is the monitor created via the "-monitor" command line switch (or "vc" if none is given). As the patch requires to rework the monitor suspension interface, it also takes the freedom to make it "truely" suspending (so far suspending meant suppressing the prompt, but inputs were still processed). Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6715 c046a42c-6fe2-441c-8c8c-71466251a162
212 lines
4.7 KiB
C
212 lines
4.7 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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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.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_TCP
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#ifdef DEBUG_MIGRATION_TCP
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#define dprintf(fmt, ...) \
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do { printf("migration-tcp: " 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 socket_errno(FdMigrationState *s)
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{
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return socket_error();
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}
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static int socket_write(FdMigrationState *s, const void * buf, size_t size)
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{
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return send(s->fd, buf, size, 0);
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}
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static int tcp_close(FdMigrationState *s)
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{
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dprintf("tcp_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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static void tcp_wait_for_connect(void *opaque)
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{
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FdMigrationState *s = opaque;
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int val, ret;
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socklen_t valsize = sizeof(val);
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dprintf("connect completed\n");
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do {
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ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
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} while (ret == -1 && (s->get_error(s)) == EINTR);
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if (ret < 0) {
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migrate_fd_error(s);
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return;
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}
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qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
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if (val == 0)
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migrate_fd_connect(s);
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else {
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dprintf("error connecting %d\n", val);
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migrate_fd_error(s);
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}
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}
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MigrationState *tcp_start_outgoing_migration(const char *host_port,
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int64_t bandwidth_limit,
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int detach)
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{
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struct sockaddr_in addr;
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FdMigrationState *s;
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int ret;
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if (parse_host_port(&addr, host_port) < 0)
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return NULL;
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s = qemu_mallocz(sizeof(*s));
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s->get_error = socket_errno;
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s->write = socket_write;
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s->close = tcp_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->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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s->fd = socket(PF_INET, SOCK_STREAM, 0);
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if (s->fd == -1) {
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qemu_free(s);
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return NULL;
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}
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socket_set_nonblock(s->fd);
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if (!detach)
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migrate_fd_monitor_suspend(s);
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do {
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ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
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if (ret == -1)
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ret = -(s->get_error(s));
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if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
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qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
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} while (ret == -EINTR);
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if (ret < 0 && ret != -EINPROGRESS && ret != -EWOULDBLOCK) {
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dprintf("connect failed\n");
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close(s->fd);
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qemu_free(s);
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return NULL;
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} else if (ret >= 0)
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migrate_fd_connect(s);
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return &s->mig_state;
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}
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static void tcp_accept_incoming_migration(void *opaque)
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{
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struct sockaddr_in addr;
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socklen_t addrlen = sizeof(addr);
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int s = (unsigned long)opaque;
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QEMUFile *f;
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int c, ret;
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do {
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c = accept(s, (struct sockaddr *)&addr, &addrlen);
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} while (c == -1 && socket_error() == EINTR);
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dprintf("accepted migration\n");
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if (c == -1) {
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fprintf(stderr, "could not accept migration connection\n");
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return;
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}
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f = qemu_fopen_socket(c);
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if (f == NULL) {
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fprintf(stderr, "could not qemu_fopen socket\n");
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goto out;
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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 out_fopen;
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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 server socket */
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qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
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close(s);
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vm_start();
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out_fopen:
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qemu_fclose(f);
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out:
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close(c);
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}
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int tcp_start_incoming_migration(const char *host_port)
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{
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struct sockaddr_in addr;
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int val;
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int s;
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if (parse_host_port(&addr, host_port) < 0) {
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fprintf(stderr, "invalid host/port combination: %s\n", host_port);
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return -EINVAL;
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}
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s = socket(PF_INET, SOCK_STREAM, 0);
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if (s == -1)
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return -socket_error();
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val = 1;
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setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1)
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goto err;
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if (listen(s, 1) == -1)
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goto err;
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qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
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(void *)(unsigned long)s);
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return 0;
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err:
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close(s);
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return -socket_error();
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}
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