When a Linux hv_sock app tries to connect to a Service GUID on which no host app is listening, a recent host (RS3+) sends a CHANNELMSG_TL_CONNECT_RESULT (23) message to Linux and this triggers such a warning: unknown msgtype=23 WARNING: CPU: 2 PID: 0 at drivers/hv/vmbus_drv.c:1031 vmbus_on_msg_dpc Actually Linux can safely ignore the message because the Linux app's connect() will time out in 2 seconds: see VSOCK_DEFAULT_CONNECT_TIMEOUT and vsock_stream_connect(). We don't bother to make use of the message because: 1) it's only supported on recent hosts; 2) a non-trivial effort is required to use the message in Linux, but the benefit is small. So, let's not see the warning by silently ignoring the message.
Unified · Split
| @@ -1351,6 +1351,8 @@ channel_message_table[CHANNELMSG_COUNT] = { · 1350 unmodified lines | |||
| 1351 | { CHANNELMSG_19, 0, NULL }, | 1351 | { CHANNELMSG_19, 0, NULL }, |
| 1352 | { CHANNELMSG_20, 0, NULL }, | 1352 | { CHANNELMSG_20, 0, NULL }, |
| 1353 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, | 1353 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, |
| 1354 | { CHANNELMSG_22, 0, NULL }, | ||
| 1355 | { CHANNELMSG_TL_CONNECT_RESULT, 0, NULL }, | ||
| 1354 | }; | 1356 | }; |
| 1355 | 1357 | ||
| 1356 | /* | 1358 | /* |
| @@ -1362,25 +1364,16 @@ void vmbus_onmessage(void *context) · 5 unmodified lines | |||
| 1362 | { | 1364 | { |
| 1363 | struct hv_message *msg = context; | 1365 | struct hv_message *msg = context; |
| 1364 | struct vmbus_channel_message_header *hdr; | 1366 | struct vmbus_channel_message_header *hdr; |
| 1365 | int size; | ||
| 1366 | 1367 | ||
| 1367 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; | 1368 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
| 1368 | size = msg->header.payload_size; | ||
| 1369 | 1369 | ||
| 1370 | trace_vmbus_on_message(hdr); | 1370 | trace_vmbus_on_message(hdr); |
| 1371 | 1371 | ||
| 1372 | if (hdr->msgtype >= CHANNELMSG_COUNT) { | 1372 | /* |
| 1373 | pr_err("Received invalid channel message type %d size %d\n", | 1373 | * vmbus_on_msg_dpc() makes sure the hdr->msgtype here can not go |
| 1374 | hdr->msgtype, size); | 1374 | * out of bound and the message_handler pointer can not be NULL. |
| 1375 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, | 1375 | */ |
| 1376 | (unsigned char *)msg->u.payload, size); | 1376 | channel_message_table[hdr->msgtype].message_handler(hdr); |
| 1377 | return; | ||
| 1378 | } | ||
| 1379 | |||
| 1380 | if (channel_message_table[hdr->msgtype].message_handler) | ||
| 1381 | channel_message_table[hdr->msgtype].message_handler(hdr); | ||
| 1382 | else | ||
| 1383 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); | ||
| 1384 | } | 1377 | } |
| 1385 | 1378 | ||
| 1386 | /* | 1379 | /* |
| @@ -1033,6 +1033,10 @@ void vmbus_on_msg_dpc(unsigned long data) · 1032 unmodified lines | |||
| 1033 | } | 1033 | } |
| 1034 | 1034 | ||
| 1035 | entry = &channel_message_table[hdr->msgtype]; | 1035 | entry = &channel_message_table[hdr->msgtype]; |
| 1036 | |||
| 1037 | if (!entry->message_handler) | ||
| 1038 | goto msg_handled; | ||
| 1039 | |||
| 1036 | if (entry->handler_type == VMHT_BLOCKING) { | 1040 | if (entry->handler_type == VMHT_BLOCKING) { |
| 1037 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); | 1041 | ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); |
| 1038 | if (ctx == NULL) | 1042 | if (ctx == NULL) |
| @@ -425,6 +425,8 @@ enum vmbus_channel_message_type { · 424 unmodified lines | |||
| 425 | CHANNELMSG_19 = 19, | 425 | CHANNELMSG_19 = 19, |
| 426 | CHANNELMSG_20 = 20, | 426 | CHANNELMSG_20 = 20, |
| 427 | CHANNELMSG_TL_CONNECT_REQUEST = 21, | 427 | CHANNELMSG_TL_CONNECT_REQUEST = 21, |
| 428 | CHANNELMSG_22 = 22, | ||
| 429 | CHANNELMSG_TL_CONNECT_RESULT = 23, | ||
| 428 | CHANNELMSG_COUNT | 430 | CHANNELMSG_COUNT |
| 429 | }; | 431 | }; |
| 430 | 432 | ||