The RDMA QIOChannel does not support bi-directional communication, so when RDMA live migration with postcopy enabled, the source qemu return path get qemu file error.
These patches implement bi-directional communication for RDMA QIOChannel and disable the RDMA WRITE during the postcopy phase. This patch just make postcopy works, and will improve performance later. [v6] - rebase - add the check whether release rdma resource has finished(David) - remove unnecessary RDMA_CONTROL_ERROR when cleanup(David) - poll the cm event for destination qemu [v5] - rebase - fix bug for create a dedicated thread to release rdma resource(David) - fix bug for poll the cm event while wait RDMA work request completion(David,Gal) [v4] - not wait RDMA_CM_EVENT_DISCONNECTED event after rdma_disconnect - implement io_set_aio_fd_handler function for RDMA QIOChannel (Juan Quintela) - invoke qio_channel_yield only when qemu_in_coroutine() (Juan Quintela) - create a dedicated thread to release rdma resource - poll the cm event while wait RDMA work request completion - implement the shutdown function for RDMA QIOChannel [v3] - add a mutex in QEMUFile struct to avoid concurrent channel close (Daniel) - destroy the mutex before free QEMUFile (David) - use rdmain and rmdaout instead of rdma->return_path (Daniel) [v2] - does not update bytes_xfer when disable RDMA WRITE (David) - implement bi-directional communication for RDMA QIOChannel (Daniel) Lidong Chen (12): migration: disable RDMA WRITE after postcopy started migration: create a dedicated connection for rdma return path migration: avoid concurrent invoke channel_close by different threads migration: implement bi-directional RDMA QIOChannel migration: Stop rdma yielding during incoming postcopy migration: implement io_set_aio_fd_handler function for RDMA QIOChannel migration: invoke qio_channel_yield only when qemu_in_coroutine() migration: poll the cm event while wait RDMA work request completion migration: implement the shutdown for RDMA QIOChannel migration: poll the cm event for destination qemu migration: remove the unnecessary RDMA_CONTROL_ERROR message migration: create a dedicated thread to release rdma resource migration/colo.c | 2 + migration/migration.c | 13 +- migration/migration.h | 10 + migration/postcopy-ram.c | 2 + migration/qemu-file-channel.c | 12 +- migration/qemu-file.c | 14 +- migration/ram.c | 4 + migration/rdma.c | 448 ++++++++++++++++++++++++++++++++++++++---- migration/savevm.c | 3 + 9 files changed, 458 insertions(+), 50 deletions(-) -- 1.8.3.1