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. [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 (6): migration: disable RDMA WRITE after postcopy started migration: create a dedicated connection for rdma return path migration: remove unnecessary variables len in QIOChannelRDMA migration: avoid concurrent invoke channel_close by different threads migration: implement bi-directional RDMA QIOChannel migration: Stop rdma yielding during incoming postcopy migration/colo.c | 2 + migration/migration.c | 2 + migration/postcopy-ram.c | 2 + migration/qemu-file.c | 13 +- migration/ram.c | 4 + migration/rdma.c | 321 +++++++++++++++++++++++++++++++++++++++++------ migration/savevm.c | 3 + 7 files changed, 307 insertions(+), 40 deletions(-) -- 1.8.3.1
