[PATCH 0/5] migration: Bug fixes (prepare for preempt-full)

[Peter Xu]

This patchset does bug fixes that I found when testing preempt-full.

Patch 1 should fix a possible deadloop when I hit when testing the
preempt-full code.  I didn't verify it because it's so hard to trigger, but
the logic should be explained in the patch.

Patch 2 fixes a race condition I can easily trigger with the latest
preempt-full code when running with recovery+tls test.  The bug hides quite
deep and took time to debug.  Fundamentally it's about qemufile API, I hope
someday we can have something better than that but still so far there's no
strong enough reason to rework the whole thing.

Patch 3-4 are two patches to disable either postcopy or preempt mode only
for xbzrle/compression.

Patch 5 is something nice to have to optimize the bitmap ops.

The last two patches are actually part of my preempt-full RFC series.

I picked these patches out explicitly from preempt-full series, because at
least patches 1-4 fix real bugs in current code base, so they should get
more focus.

Thanks,

Peter Xu (5):
  migration: Fix possible deadloop of ram save process
  migration: Fix race on qemu_file_shutdown()
  migration: Disallow xbzrle with postcopy
  migration: Disallow postcopy preempt to be used with compress
  migration: Use non-atomic ops for clear log bitmap

 include/exec/ram_addr.h | 11 +++++-----
 include/exec/ramblock.h |  3 +++
 include/qemu/bitmap.h   |  1 +
 migration/migration.c   | 16 +++++++++++++++
 migration/qemu-file.c   | 27 ++++++++++++++++++++++---
 migration/ram.c         | 16 +++++++++++----
 util/bitmap.c           | 45 +++++++++++++++++++++++++++++++++++++++++
 7 files changed, 107 insertions(+), 12 deletions(-)

-- 
2.32.0