[qemu-xen staging] Merge remote-tracking branch 'remotes/ericb/tags/pull-bitmaps-2020-07-27' into staging

[patchbot@xxxxxxx]

commit 264991512193ee50e27d43e66f832d5041cf3b28
Merge: 1b242c3b1ec7c6011901b4f3b4b0876e31746afb 
37931e006f05cb768b78dcc47453b13f76ea43c5
Author:     Peter Maydell <peter.maydell@xxxxxxxxxx>
AuthorDate: Tue Jul 28 14:38:17 2020 +0100
Commit:     Peter Maydell <peter.maydell@xxxxxxxxxx>
CommitDate: Tue Jul 28 14:38:17 2020 +0100

    Merge remote-tracking branch 'remotes/ericb/tags/pull-bitmaps-2020-07-27' 
into staging
    
    bitmaps patches for 2020-07-27
    
    - Improve handling of various post-copy bitmap migration scenarios. A lost
    bitmap should merely mean that the next backup must be full rather than
    incremental, rather than abruptly breaking the entire guest migration.
    - Associated iotest improvements
    
    # gpg: Signature made Mon 27 Jul 2020 21:46:17 BST
    # gpg:                using RSA key 71C2CC22B1C4602927D2F3AAA7A16B4A2527436A
    # gpg: Good signature from "Eric Blake <eblake@xxxxxxxxxx>" [full]
    # gpg:                 aka "Eric Blake (Free Software Programmer) 
<ebb9@xxxxxxx>" [full]
    # gpg:                 aka "[jpeg image of size 6874]" [full]
    # Primary key fingerprint: 71C2 CC22 B1C4 6029 27D2  F3AA A7A1 6B4A 2527 
436A
    
    * remotes/ericb/tags/pull-bitmaps-2020-07-27: (24 commits)
      migration: Fix typos in bitmap migration comments
      iotests: Adjust which migration tests are quick
      qemu-iotests/199: add source-killed case to bitmaps postcopy
      qemu-iotests/199: add early shutdown case to bitmaps postcopy
      qemu-iotests/199: check persistent bitmaps
      qemu-iotests/199: prepare for new test-cases addition
      migration/savevm: don't worry if bitmap migration postcopy failed
      migration/block-dirty-bitmap: cancel migration on shutdown
      migration/block-dirty-bitmap: relax error handling in incoming part
      migration/block-dirty-bitmap: keep bitmap state for all bitmaps
      migration/block-dirty-bitmap: simplify dirty_bitmap_load_complete
      migration/block-dirty-bitmap: rename finish_lock to just lock
      migration/block-dirty-bitmap: refactor state global variables
      migration/block-dirty-bitmap: move mutex init to dirty_bitmap_mig_init
      migration/block-dirty-bitmap: rename dirty_bitmap_mig_cleanup
      migration/block-dirty-bitmap: rename state structure types
      migration/block-dirty-bitmap: fix dirty_bitmap_mig_before_vm_start
      qemu-iotests/199: increase postcopy period
      qemu-iotests/199: change discard patterns
      qemu-iotests/199: improve performance: set bitmap by discard
      ...
    
    Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>

 block/qcow2.c                  |   2 +-
 docs/interop/qcow2.txt         |   2 +-
 migration/block-dirty-bitmap.c | 474 ++++++++++++++++++++++++++---------------
 migration/migration.c          |  15 +-
 migration/migration.h          |   3 +-
 migration/savevm.c             |  37 +++-
 tests/qemu-iotests/199         | 250 +++++++++++++++++-----
 tests/qemu-iotests/199.out     |   4 +-
 tests/qemu-iotests/group       |  12 +-
 9 files changed, 555 insertions(+), 244 deletions(-)
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#staging