[Qemu-commits] [qemu/qemu] c3c5ea: migration: Fix cancel state

[Peter Maydell]

  Branch: refs/heads/master
  Home:   https://github.com/qemu/qemu
  Commit: c3c5eae6ac69d9f7d4618407aa6c8ac5edc2267c
      
https://github.com/qemu/qemu/commit/c3c5eae6ac69d9f7d4618407aa6c8ac5edc2267c
  Author: Dr. David Alan Gilbert <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/migration.c

  Log Message:
  -----------
  migration: Fix cancel state

During a cancelled migration there's a race where the fd can
go into an error state before we get back around the migration loop
and migration_detect_error transitions from cancelling->failed.

Check for cancelled/cancelling and don't change the state.

Red Hat bug: https://bugzilla.redhat.com/show_bug.cgi?id=1608649

Fixes: b23c2ade250
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>


  Commit: cf75e2684938413f0bbe95f5a4b7db5c845e42c8
      
https://github.com/qemu/qemu/commit/cf75e2684938413f0bbe95f5a4b7db5c845e42c8
  Author: Dr. David Alan Gilbert <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/rdma.c

  Log Message:
  -----------
  migration/rdma: Fix qemu_rdma_cleanup null check

If the migration fails before the channel is open (e.g. a bad
address) we end up in the cleanup with rdma->channel==NULL.

Spotted by Coverity: CID 1398634
Fixes: fbbaacab2758cb3f32a0
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>


  Commit: 892ae715b6bc8107fccaa3caeb2a5bd4f6d2cb37
      
https://github.com/qemu/qemu/commit/892ae715b6bc8107fccaa3caeb2a5bd4f6d2cb37
  Author: Dr. David Alan Gilbert <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M include/migration/misc.h
    M migration/migration.c
    M vl.c

  Log Message:
  -----------
  migration: Cleanup during exit

Currently we cleanup the migration object as we exit main after the
main_loop finishes; however if there's a migration running things
get messy and we can end up with the migration thread still trying
to access freed structures.

We now take a ref to the object around the migration thread itself,
so the act of dropping the ref during exit doesn't cause us to lose
the state until the thread quits.

Cancelling the migration during migration also tries to get the thread
to quit.

We do this a bit earlier; so hopefully migration gets out of the way
before all the devices etc are freed.

Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Tested-by: Alex Bennée <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 9589e7630139700581eff3ba9ddfdfbe99362440
      
https://github.com/qemu/qemu/commit/9589e7630139700581eff3ba9ddfdfbe99362440
  Author: Marcel Apfelbaum <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/rdma.c

  Log Message:
  -----------
  migration/rdma: clang compilation fix

Configuring QEMU with:
        ../configure --cc=clang --enable-rdma

Leads to compilation error:

  CC      migration/rdma.o
  CC      migration/block.o
  qemu/migration/rdma.c:3615:58: error: taking address of packed member 'rkey' 
of class or structure
      'RDMARegisterResult' may result in an unaligned pointer value 
[-Werror,-Waddress-of-packed-member]
                            (uintptr_t)host_addr, NULL, &reg_result->rkey,
                                                         ^~~~~~~~~~~~~~~~
Fix it by using a temp local variable.

Signed-off-by: Marcel Apfelbaum <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>


  Commit: 754cb9c0ebcf2164107baf39e75517e459887622
      
https://github.com/qemu/qemu/commit/754cb9c0ebcf2164107baf39e75517e459887622
  Author: Yury Kotov <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M exec.c
    M include/exec/cpu-common.h
    M migration/postcopy-ram.c
    M migration/rdma.c
    M stubs/ram-block.c
    M util/vfio-helpers.c

  Log Message:
  -----------
  exec: Change RAMBlockIterFunc definition

Currently, qemu_ram_foreach_* calls RAMBlockIterFunc with many
block-specific arguments. But often iter func needs RAMBlock*.
This refactoring is needed for fast access to RAMBlock flags from
qemu_ram_foreach_block's callback. The only way to achieve this now
is to call qemu_ram_block_from_host (which also enumerates blocks).

So, this patch reduces complexity of
qemu_ram_foreach_block() -> cb() -> qemu_ram_block_from_host()
from O(n^2) to O(n).

Fix RAMBlockIterFunc definition and add some functions to read
RAMBlock* fields witch were passed.

Signed-off-by: Yury Kotov <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 18269069c31089c3b42ef78ddffe1ee5799e2708
      
https://github.com/qemu/qemu/commit/18269069c31089c3b42ef78ddffe1ee5799e2708
  Author: Yury Kotov <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/migration.c
    M migration/migration.h
    M qapi/migration.json

  Log Message:
  -----------
  migration: Introduce ignore-shared capability

We want to use local migration to update QEMU for running guests.
In this case we don't need to migrate shared (file backed) RAM.
So, add a capability to ignore such blocks during live migration.

Signed-off-by: Yury Kotov <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: fbd162e629aaf8a7e464af44d2f73d06b26428ad
      
https://github.com/qemu/qemu/commit/fbd162e629aaf8a7e464af44d2f73d06b26428ad
  Author: Yury Kotov <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M exec.c
    M include/exec/cpu-common.h
    M migration/migration.h
    M migration/postcopy-ram.c
    M migration/ram.c
    M migration/rdma.c

  Log Message:
  -----------
  migration: Add an ability to ignore shared RAM blocks

If ignore-shared capability is set then skip shared RAMBlocks during the
RAM migration.
Also, move qemu_ram_foreach_migratable_block (and rename) to the
migration code, because it requires access to the migration capabilities.

Signed-off-by: Yury Kotov <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 660a9b681256b07261048c5e4a569eadadd5753b
      
https://github.com/qemu/qemu/commit/660a9b681256b07261048c5e4a569eadadd5753b
  Author: Yury Kotov <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M tests/migration-test.c

  Log Message:
  -----------
  tests/migration-test: Add a test for ignore-shared capability

Signed-off-by: Yury Kotov <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
  dgilbert: Disabled the test for now, not happy on aarch64


  Commit: 6cafc8e4ddea32cb12346393f433e6cab346398c
      
https://github.com/qemu/qemu/commit/6cafc8e4ddea32cb12346393f433e6cab346398c
  Author: Yury Kotov <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/savevm.c

  Log Message:
  -----------
  migration: Add capabilities validation

Currently we don't check which capabilities set in the source QEMU.
We just expect that the target QEMU has the same enabled capabilities.

Add explicit validation for capabilities to make sure that the target VM
has them too. This is enabled for only new capabilities to keep compatibily.

Signed-off-by: Yury Kotov <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
  dgilbert: Manual merge


  Commit: cdf842299de873663e992a6b5db8914c406bba6f
      
https://github.com/qemu/qemu/commit/cdf842299de873663e992a6b5db8914c406bba6f
  Author: Juan Quintela <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M tests/migration-test.c

  Log Message:
  -----------
  tests: Add migration xbzrle test

Reviewed-by: Peter Xu <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
  dgilbert: Fixup for class with Yury's series


  Commit: 9aca82ba3108d15529a2e0f5b0996cac309a7216
      
https://github.com/qemu/qemu/commit/9aca82ba3108d15529a2e0f5b0996cac309a7216
  Author: Juan Quintela <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M hmp.c
    M migration/migration.c
    M migration/migration.h
    M migration/socket.c
    M qapi/migration.json

  Log Message:
  -----------
  migration: Create socket-address parameter

It will be used to store the uri parameters. We want this only for
tcp, so we don't set it for other uris.  We need it to know what port
is migration running.

Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
  dgilbert: Removed DummyStruct as suggested by Eric & Markus

--


  Commit: 609d3844076ebcfc507fb8a8ddaf2cb7d7c6bc48
      
https://github.com/qemu/qemu/commit/609d3844076ebcfc507fb8a8ddaf2cb7d7c6bc48
  Author: Juan Quintela <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M tests/migration-test.c

  Log Message:
  -----------
  tests: Add basic migration precopy tcp test

Not sharing code from precopy/unix because we have to read back the
tcp parameter.

Signed-off-by: Juan Quintela <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Reviewed-by: Thomas Huth <address@hidden>

Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
  dgilbert:  Fixup for clash with Yury's


  Commit: e7c91368d24637f077b457187f8dff4767dfadae
      
https://github.com/qemu/qemu/commit/e7c91368d24637f077b457187f8dff4767dfadae
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M include/qemu/bitmap.h

  Log Message:
  -----------
  bitmap: fix bitmap_count_one

BITMAP_LAST_WORD_MASK(nbits) returns 0xffffffff when "nbits=0", which
makes bitmap_count_one fail to handle the "nbits=0" case. It appears to be
preferred to remain BITMAP_LAST_WORD_MASK identical to the kernel
implementation that it is ported from.

So this patch fixes bitmap_count_one to handle the nbits=0 case.

Inital Discussion Link:
https://www.mail-archive.com/address@hidden/msg554316.html
Signed-off-by: Wei Wang <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Peter Xu <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 94960256ae0bc346de49e2ef3808778e8468caf5
      
https://github.com/qemu/qemu/commit/94960256ae0bc346de49e2ef3808778e8468caf5
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M include/qemu/bitmap.h

  Log Message:
  -----------
  bitmap: bitmap_count_one_with_offset

Count the number of 1s in a bitmap starting from an offset.

Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 386a907b37a9321bc5d699bc37104d6ffba1b34d
      
https://github.com/qemu/qemu/commit/386a907b37a9321bc5d699bc37104d6ffba1b34d
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/ram.c

  Log Message:
  -----------
  migration: use bitmap_mutex in migration_bitmap_clear_dirty

The bitmap mutex is used to synchronize threads to update the dirty
bitmap and the migration_dirty_pages counter. For example, the free
page optimization clears bits of free pages from the bitmap in an
iothread context. This patch makes migration_bitmap_clear_dirty update
the bitmap and counter under the mutex.

Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Peter Xu <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 6bcb05fc4211d2bd88fe73c65e93602428c51e5b
      
https://github.com/qemu/qemu/commit/6bcb05fc4211d2bd88fe73c65e93602428c51e5b
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M include/migration/misc.h
    M migration/ram.c

  Log Message:
  -----------
  migration: API to clear bits of guest free pages from the dirty bitmap

This patch adds an API to clear bits corresponding to guest free pages
from the dirty bitmap. Spilt the free page block if it crosses the QEMU
RAMBlock boundary.

Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Peter Xu <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: bd2270608fa0112108aafcba89b87282c68db741
      
https://github.com/qemu/qemu/commit/bd2270608fa0112108aafcba89b87282c68db741
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M include/migration/misc.h
    M migration/ram.c
    M migration/savevm.c
    M vl.c

  Log Message:
  -----------
  migration/ram.c: add a notifier chain for precopy

This patch adds a notifier chain for the memory precopy. This enables various
precopy optimizations to be invoked at specific places.

Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Peter Xu <address@hidden>
Reviewed-by: Peter Xu <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: 6eeb63f740874150d7b5921541948c29b920a21d
      
https://github.com/qemu/qemu/commit/6eeb63f740874150d7b5921541948c29b920a21d
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M include/migration/misc.h
    M migration/ram.c

  Log Message:
  -----------
  migration/ram.c: add the free page optimization enable flag

This patch adds the free page optimization enable flag, and a function
to set this flag. When the free page optimization is enabled, not all
the pages are needed to be sent in the bulk stage.

Why using a new flag, instead of directly disabling ram_bulk_stage when
the optimization is running?
Thanks for Peter Xu's reminder that disabling ram_bulk_stage will affect
the use of compression. Please see save_page_use_compression. When
xbzrle and compression are used, if free page optimizaion causes the
ram_bulk_stage to be disabled, save_page_use_compression will return
false, which disables the use of compression. That is, if free page
optimization avoids the sending of half of the guest pages, the other
half of pages loses the benefits of compression in the meantime. Using a
new flag to let migration_bitmap_find_dirty skip the free pages in the
bulk stage will avoid the above issue.

Signed-off-by: Wei Wang <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Peter Xu <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: c13c4153f76db23cac06a12044bf4dd346764059
      
https://github.com/qemu/qemu/commit/c13c4153f76db23cac06a12044bf4dd346764059
  Author: Wei Wang <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M hw/virtio/virtio-balloon.c
    M include/hw/virtio/virtio-balloon.h

  Log Message:
  -----------
  virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT

The new feature enables the virtio-balloon device to receive hints of
guest free pages from the free page vq.

A notifier is registered to the migration precopy notifier chain. The
notifier calls free_page_start after the migration thread syncs the dirty
bitmap, so that the free page optimization starts to clear bits of free
pages from the bitmap. It calls the free_page_stop before the migration
thread syncs the bitmap, which is the end of the current round of ram
save. The free_page_stop is also called to stop the optimization in the
case when there is an error occurred in the process of ram saving.

Note: balloon will report pages which were free at the time of this call.
As the reporting happens asynchronously, dirty bit logging must be
enabled before this free_page_start call is made. Guest reporting must be
disabled before the migration dirty bitmap is synchronized.

Signed-off-by: Wei Wang <address@hidden>
CC: Michael S. Tsirkin <address@hidden>
CC: Dr. David Alan Gilbert <address@hidden>
CC: Juan Quintela <address@hidden>
CC: Peter Xu <address@hidden>
Message-Id: <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>
  dgilbert: Dropped kernel header update, fixed up CMD_ID_* name change


  Commit: b8b5734b092baf3c53f3f117595704ffe9469a75
      
https://github.com/qemu/qemu/commit/b8b5734b092baf3c53f3f117595704ffe9469a75
  Author: Zhang Chen <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/colo.c

  Log Message:
  -----------
  Migration/colo.c: Fix double close bug when occur COLO failover

In migration_incoming_state_destroy(void) will check the mis->to_src_file
to double close the mis->to_src_file when occur COLO failover.

Signed-off-by: Zhang Chen <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: db00972922c875ce354a102c94699fe40612c90d
      
https://github.com/qemu/qemu/commit/db00972922c875ce354a102c94699fe40612c90d
  Author: Zhang Chen <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M migration/colo.c
    M migration/migration.c

  Log Message:
  -----------
  Migration/colo.c: Make COLO node running after failover

Delay to close COLO for auto start VM after failover.

Signed-off-by: Zhang Chen <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: b5922fc5891261153f1a0f20e814c620aabeb6ac
      
https://github.com/qemu/qemu/commit/b5922fc5891261153f1a0f20e814c620aabeb6ac
  Author: Zhang Chen <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M qapi/migration.json

  Log Message:
  -----------
  qapi/migration.json: Remove a variable that doesn't exist in example

Remove the "active" variable in example for query-colo-status.
It is a doc bug from commit f56c0065

Signed-off-by: Zhang Chen <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Dr. David Alan Gilbert <address@hidden>


  Commit: c557a8c7b755d8c153fc0f5be00688228be96e76
      
https://github.com/qemu/qemu/commit/c557a8c7b755d8c153fc0f5be00688228be96e76
  Author: Peter Maydell <address@hidden>
  Date:   2019-03-06 (Wed, 06 Mar 2019)

  Changed paths:
    M exec.c
    M hmp.c
    M hw/virtio/virtio-balloon.c
    M include/exec/cpu-common.h
    M include/hw/virtio/virtio-balloon.h
    M include/migration/misc.h
    M include/qemu/bitmap.h
    M migration/colo.c
    M migration/migration.c
    M migration/migration.h
    M migration/postcopy-ram.c
    M migration/ram.c
    M migration/rdma.c
    M migration/savevm.c
    M migration/socket.c
    M qapi/migration.json
    M stubs/ram-block.c
    M tests/migration-test.c
    M util/vfio-helpers.c
    M vl.c

  Log Message:
  -----------
  Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20190306a' 
into staging

Migation pull 2019-03-06

(This replaces the pull sent yesterday)

   a) 4 small fixes including the cancel problem
     that caused the ahci migration test to fail
     intermittently
   b) Yury's ignore-shared feature
   c) Juan's extra tests
   d) Wei Wang's free page hinting
   e) Some Colo fixes from Zhang Chen

Diff from yesterdays pull:
  1) A missing fix of mine (cleanup during exit)
  2) Changes from Eric/Markus on 'Create socket-address parameter'

# gpg: Signature made Wed 06 Mar 2019 11:39:53 GMT
# gpg:                using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <address@hidden>" 
[full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-migration-20190306a: (22 commits)
  qapi/migration.json: Remove a variable that doesn't exist in example
  Migration/colo.c: Make COLO node running after failover
  Migration/colo.c: Fix double close bug when occur COLO failover
  virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
  migration/ram.c: add the free page optimization enable flag
  migration/ram.c: add a notifier chain for precopy
  migration: API to clear bits of guest free pages from the dirty bitmap
  migration: use bitmap_mutex in migration_bitmap_clear_dirty
  bitmap: bitmap_count_one_with_offset
  bitmap: fix bitmap_count_one
  tests: Add basic migration precopy tcp test
  migration: Create socket-address parameter
  tests: Add migration xbzrle test
  migration: Add capabilities validation
  tests/migration-test: Add a test for ignore-shared capability
  migration: Add an ability to ignore shared RAM blocks
  migration: Introduce ignore-shared capability
  exec: Change RAMBlockIterFunc definition
  migration/rdma: clang compilation fix
  migration: Cleanup during exit
  ...

Signed-off-by: Peter Maydell <address@hidden>


Compare: https://github.com/qemu/qemu/compare/9b748c5e061b...c557a8c7b755