@@ -40,6 +40,13 @@ struct MigrationParams {
bool shared;
};
+/* Commands sent on the return path from destination to source*/
+enum mig_rpcomm_cmd {
+ MIG_RPCOMM_INVALID = 0, /* Must be 0 */
+ MIG_RPCOMM_SHUT, /* sibling will not send any more RP messages */
+ MIG_RPCOMM_ACK, /* data (seq: be32 ) */
+ MIG_RPCOMM_AFTERLASTVALID
+};
typedef struct MigrationState MigrationState;
/* State for the incoming migration */
@@ -47,6 +54,7 @@ struct MigrationIncomingState {
QEMUFile *file;
QEMUFile *return_path;
+ QemuMutex rp_mutex; /* We send replies from multiple threads */
};
MigrationIncomingState *migration_incoming_get_current(void);
@@ -168,6 +176,16 @@ int64_t migrate_xbzrle_cache_size(void);
int64_t xbzrle_cache_resize(int64_t new_size);
+/* Sending on the return path - generic and then for each message type */
+void migrate_send_rp_message(MigrationIncomingState *mis,
+ enum mig_rpcomm_cmd cmd,
+ uint16_t len, uint8_t *data);
+void migrate_send_rp_shut(MigrationIncomingState *mis,
+ uint32_t value);
+void migrate_send_rp_ack(MigrationIncomingState *mis,
+ uint32_t value);
+
+
void ram_control_before_iterate(QEMUFile *f, uint64_t flags);
void ram_control_after_iterate(QEMUFile *f, uint64_t flags);
void ram_control_load_hook(QEMUFile *f, uint64_t flags);
@@ -90,6 +90,7 @@ MigrationIncomingState *migration_incoming_state_init(QEMUFile* f)
{
mis_current = g_malloc0(sizeof(MigrationIncomingState));
mis_current->file = f;
+ qemu_mutex_init(&mis_current->rp_mutex);
return mis_current;
}
@@ -100,6 +101,46 @@ void migration_incoming_state_destroy(void)
mis_current = NULL;
}
+/* Send a message on the return channel back to the source
+ * of the migration.
+ */
+void migrate_send_rp_message(MigrationIncomingState *mis,
+ enum mig_rpcomm_cmd cmd,
+ uint16_t len, uint8_t *data)
+{
+ DPRINTF("migrate_send_rp_message: cmd=%d, len=%d\n", (int)cmd, len);
+ qemu_mutex_lock(&mis->rp_mutex);
+ qemu_put_be16(mis->return_path, (unsigned int)cmd);
+ qemu_put_be16(mis->return_path, len);
+ qemu_put_buffer(mis->return_path, data, len);
+ qemu_fflush(mis->return_path);
+ qemu_mutex_unlock(&mis->rp_mutex);
+}
+
+/*
+ * Send a 'SHUT' message on the return channel with the given value
+ * to indicate that we've finished with the RP. None-0 value indicates
+ * error.
+ */
+void migrate_send_rp_shut(MigrationIncomingState *mis,
+ uint32_t value)
+{
+ uint32_t buf;
+
+ buf = cpu_to_be32(value);
+ migrate_send_rp_message(mis, MIG_RPCOMM_SHUT, 4, (uint8_t *)&buf);
+}
+
+/* Send an 'ACK' message on the return channel with the given value */
+void migrate_send_rp_ack(MigrationIncomingState *mis,
+ uint32_t value)
+{
+ uint32_t buf;
+
+ buf = cpu_to_be32(value);
+ migrate_send_rp_message(mis, MIG_RPCOMM_ACK, 4, (uint8_t *)&buf);
+}
+
void qemu_start_incoming_migration(const char *uri, Error **errp)
{
const char *p;