[PATCH 0/2] migration/rdma: fix blocking readv and zero-page accounting

[Bin Guo <guobin@linux.alibaba.com>]

This small series fixes two independent issues in the RDMA migration
code path that were noticed while reviewing the QIOChannelRDMA behavior
and migration statistics during RDMA live migration.

Patch 1 makes QIOChannelRDMA's readv honor the blocking flag set via
io_set_blocking().  Previously, in blocking mode it returned immediately
when the receive buffer could not satisfy the request, diverging from
other QIOChannel implementations.  The fix loops on
qemu_rdma_exchange_recv() while the channel is in blocking mode, and
removes the now-stale XXX comments about unimplemented blocking
support.

Patch 2 fixes transfer accounting for the RDMA zero page compression
path.  When a zero page is detected, an RDMA_CONTROL_COMPRESS message
is sent instead of an RDMA Write, but mig_stats.rdma_bytes and
ram_transferred_add() were never updated, so migration progress and
bandwidth were undercounted.  The patch accounts the wire cost
(RDMAControlHeader + RDMACompress payload), matching how the non-RDMA
path accounts for zero page markers.

Both patches are small and self-contained; no behavior change is
expected outside the RDMA migration path.

Bin Guo (2):
  migration/rdma: honor blocking mode in QIOChannelRDMA readv
  migration/rdma: account transferred bytes for zero page compression

 migration/rdma.c | 62 ++++++++++++++++++++++--------------------------
 1 file changed, 29 insertions(+), 33 deletions(-)

-- 
2.50.1 (Apple Git-155)