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xemu/migration
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Chuan Zheng a1af605bd5 migration/multifd: fix hangup with TLS-Multifd due to blocking handshake 
The qemu main loop could hang up forever when we enable TLS+Multifd.
The Src multifd_send_0 invokes tls handshake, it sends hello to sever
and wait response.
However, the Dst main qemu loop has been waiting recvmsg() for multifd_recv_1.
Both of Src and Dst main qemu loop are blocking and waiting for reponse which
results in hanging up forever.

Src: (multifd_send_0)                                              Dst: (multifd_recv_1)
multifd_channel_connect                                            migration_channel_process_incoming
  multifd_tls_channel_connect                                        migration_tls_channel_process_incoming
    multifd_tls_channel_connect                                        qio_channel_tls_handshake_task
       qio_channel_tls_handshake                                         gnutls_handshake
          qio_channel_tls_handshake_task                                       ...
            qcrypto_tls_session_handshake                                      ...
              gnutls_handshake                                                 ...
                   ...                                                         ...
                recvmsg (Blocking I/O waiting for response)                recvmsg (Blocking I/O waiting for response)

Fix this by offloadinig handshake work to a background thread.

Reported-by: Yan Jin <jinyan12@huawei.com>
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
Message-Id: <1604643893-8223-1-git-send-email-zhengchuan@huawei.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-11-12 14:35:29 +00:00
..
block-dirty-bitmap.c
migration/block-dirty-bitmap: fix uninitialized variable warning
2020-10-26 06:56:24 -05:00
block.c
migration: using trace_ to replace DPRINTF
2020-10-26 16:15:04 +00:00
block.h
…
channel.c
migration/tls: save hostname into MigrationState
2020-09-25 12:45:58 +01:00
channel.h
…
colo-failover.c
qemu/atomic.h: rename atomic_ to qatomic_
2020-09-23 16:07:44 +01:00
colo.c
error: Remove NULL checks on error_propagate() calls (again)
2020-10-09 08:36:23 +02:00
dirtyrate.c
Trivial Patches Pull request 20201013
2020-10-13 14:06:22 +01:00
dirtyrate.h
migration/dirtyrate: Implement set_sample_page_period() and is_sample_period_valid()
2020-09-25 12:45:58 +01:00
exec.c
…
exec.h
…
fd.c
monitor: Use getter/setter functions for cur_mon
2020-10-09 07:08:19 +02:00
fd.h
…
global_state.c
migration: Silence compiler warning in global_state_store_running()
2020-10-02 12:28:48 +01:00
meson.build
migration: Move the creation of the library to the main meson.build
2020-10-12 11:50:20 -04:00
migration.c
qapi: Add VFIO devices migration stats in Migration stats
2020-11-01 12:30:51 -07:00
migration.h
migration: Maintain postcopy faulted addresses
2020-10-26 16:15:04 +00:00
multifd-zlib.c
…
multifd-zstd.c
…
multifd.c
migration/multifd: fix hangup with TLS-Multifd due to blocking handshake
2020-11-12 14:35:29 +00:00
multifd.h
migration/tls: add tls_hostname into MultiFDSendParams
2020-09-25 12:45:58 +01:00
page_cache.c
migration: using trace_ to replace DPRINTF
2020-10-26 16:15:04 +00:00
page_cache.h
…
postcopy-ram.c
migration: Unify reset of last_rb on destination node when recover
2020-11-02 18:25:39 +00:00
postcopy-ram.h
migration/: fix some comment spelling errors
2020-09-17 20:36:32 +02:00
qemu-file-channel.c
…
qemu-file-channel.h
…
qemu-file.c
…
qemu-file.h
…
qjson.c
…
qjson.h
…
ram.c
migration/ram: Fix hexadecimal format string specifier
2020-11-12 14:02:41 +00:00
ram.h
migration/dirtyrate: move RAMBLOCK_FOREACH_MIGRATABLE into ram.h
2020-09-25 12:45:57 +01:00
rdma.c
migration: Delete redundant spaces
2020-10-26 16:15:04 +00:00
rdma.h
…
savevm.c
migration: Postpone the kick of the fault thread after recover
2020-11-02 18:25:48 +00:00
savevm.h
…
socket.c
migration: unify the framework of socket-type channel
2020-08-28 13:34:52 +01:00
socket.h
migration: unify the framework of socket-type channel
2020-08-28 13:34:52 +01:00
tls.c
migration/tls: extract migration_tls_client_create for common-use
2020-09-25 12:45:58 +01:00
tls.h
migration/tls: extract migration_tls_client_create for common-use
2020-09-25 12:45:58 +01:00
trace-events
migration: Sync requested pages after postcopy recovery
2020-10-26 16:15:04 +00:00
trace.h
trace: switch position of headers to what Meson requires
2020-08-21 06:18:24 -04:00
vmstate-types.c
migration: Drop unused VMSTATE_FLOAT64 support
2020-10-26 16:15:04 +00:00
vmstate.c
migration: Add spaces around operator
2020-10-26 16:15:04 +00:00
xbzrle.c
…
xbzrle.h
…