[PATCH 0/3] bugfixes for migration using compression methods

[Yuan Liu]

This set of patches is used to fix the bugs of incorrect migration
memory data when compression is enabled.

The method to reproduce this bug is as follows
1. Run "stress-ng --class memory --all 1" in the source side, the
stress-ng tool comes from https://github.com/ColinIanKing/stress-ng.git

2. Enable the multifd compression methods and start migration
   e.g. migrate_set_parameter multifd-compression qpl

3. The guest kernel will crash automatically or crash at shutdown after
   the migration is complete

The root cause of the bugs and the solutions are described in detail in
the patch.

My verification method as follows
1. Start the VM and run the stess-ng test command on the source side.
2. Start the VM with "-S" parameter on the target side, it is
   used to pause the vCPUs after migration.
3. After the migration is successful, use the dump-guest-memory command
   to export the memory data of the source and target VMs respectively.
4. Use "cmp -l source_memory target_memory" to verify memory data.

Yuan Liu (3):
  multifd: bugfix for migration using compression methods
  multifd: bugfix for incorrect migration data with QPL compression
  multifd: bugfix for incorrect migration data with qatzip compression

 migration/multifd-nocomp.c | 3 +--
 migration/multifd-qatzip.c | 1 +
 migration/multifd-qpl.c    | 1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

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2.43.0