migration: allow send_rq to fail

We will not allow failures to happen when sending data from destination
to source via the return path. However it is possible that there can be
errors along the way.  This patch allows the migrate_send_rp_message()
to return error when it happens, and further extended it to
migrate_send_rp_req_pages().
Reviewed-by: NDr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: NPeter Xu <peterx@redhat.com>
Message-Id: <20180208103132.28452-9-peterx@redhat.com>
Signed-off-by: NDr. David Alan Gilbert <dgilbert@redhat.com>

migration/migration.c

@@ -205,17 +205,35 @@ static void deferred_incoming_migration(Error **errp)
  * Send a message on the return channel back to the source
  * of the migration.
  */
-static void migrate_send_rp_message(MigrationIncomingState *mis,
-                                    enum mig_rp_message_type message_type,
-                                    uint16_t len, void *data)
+static int migrate_send_rp_message(MigrationIncomingState *mis,
+                                   enum mig_rp_message_type message_type,
+                                   uint16_t len, void *data)
 {
+    int ret = 0;
+
     trace_migrate_send_rp_message((int)message_type, len);
     qemu_mutex_lock(&mis->rp_mutex);
+
+    /*
+     * It's possible that the file handle got lost due to network
+     * failures.
+     */
+    if (!mis->to_src_file) {
+        ret = -EIO;
+        goto error;
+    }
+
     qemu_put_be16(mis->to_src_file, (unsigned int)message_type);
     qemu_put_be16(mis->to_src_file, len);
     qemu_put_buffer(mis->to_src_file, data, len);
     qemu_fflush(mis->to_src_file);
+
+    /* It's possible that qemu file got error during sending */
+    ret = qemu_file_get_error(mis->to_src_file);
+
+error:
     qemu_mutex_unlock(&mis->rp_mutex);
+    return ret;
 }
 
 /* Request a range of pages from the source VM at the given
@@ -225,11 +243,12 @@ static void migrate_send_rp_message(MigrationIncomingState *mis,
  *   Start: Address offset within the RB
  *   Len: Length in bytes required - must be a multiple of pagesize
  */
-void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
-                               ram_addr_t start, size_t len)
+int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
+                              ram_addr_t start, size_t len)
 {
     uint8_t bufc[12 + 1 + 255]; /* start (8), len (4), rbname up to 256 */
     size_t msglen = 12; /* start + len */
+    enum mig_rp_message_type msg_type;
 
     *(uint64_t *)bufc = cpu_to_be64((uint64_t)start);
     *(uint32_t *)(bufc + 8) = cpu_to_be32((uint32_t)len);
@@ -241,10 +260,12 @@ void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char *rbname,
         bufc[msglen++] = rbname_len;
         memcpy(bufc + msglen, rbname, rbname_len);
         msglen += rbname_len;
-        migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES_ID, msglen, bufc);
+        msg_type = MIG_RP_MSG_REQ_PAGES_ID;
     } else {
-        migrate_send_rp_message(mis, MIG_RP_MSG_REQ_PAGES, msglen, bufc);
+        msg_type = MIG_RP_MSG_REQ_PAGES;
     }
+
+    return migrate_send_rp_message(mis, msg_type, msglen, bufc);
 }
 
 void qemu_start_incoming_migration(const char *uri, Error **errp)

migration/migration.h

@@ -230,7 +230,7 @@ void migrate_send_rp_shut(MigrationIncomingState *mis,
                           uint32_t value);
 void migrate_send_rp_pong(MigrationIncomingState *mis,
                           uint32_t value);
-void migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
+int migrate_send_rp_req_pages(MigrationIncomingState *mis, const char* rbname,
                               ram_addr_t start, size_t len);
 
 #endif