[PATCH 00/11] vmstate: Implement VMS_ARRAY_OF_POINTER_AUTO_ALLOC

[Peter Xu <peterx@redhat.com>]

CI: https://gitlab.com/peterx/qemu/-/pipelines/2424266591
    (one checkpatch warning, not relevant to this series)

rfcv1: https://lore.kernel.org/r/20260317232332.15209-1-peterx@redhat.com
rfcv2: https://lore.kernel.org/r/20260326210532.379027-1-peterx@redhat.com

Changelog rfcv2->v1:

- Rebased to latest fabiano's migration-staging branch (bd698d7730)
- Collected new tags
- Patch 1
  - Add space between "_type*" [Phil]
- Patch 9
  - Slight refactoring on vmstate_load_next() [Fabiano]
  - I collected Alexander's tested-by even if strictly I shouldn't when the
    patch changed; if test fails, it's me to blame.

This is v1, I removed RFC as I we should have reached some form of
consensus in general.  It is based on Fabiano's migration-staging branch.
I've pushed this tree here for easier reference:

https://gitlab.com/peterx/qemu/-/tree/vmstate-array-null

This series implements a new vmstate flag that allows real dynamic array of
pointers to be migrated, so that QEMU vmstate core will be able to identify
NULL and non-NULL pointers pointing to any kind of VMSD (or base types),
then properly allocate memory for them on dest QEMU.

The first planned user of such is Alexander's NVMe migration series here:

https://lore.kernel.org/r/20260317102708.126725-1-alexander@mihalicyn.com

This is another alternative to solve this problem.

I tested analyze-migration.py with this version and it works with an idle
dump from the nvme series (after I rebase).

Thanks,

Alexander Mikhalitsyn (1):
  tests/unit/test-vmstate: add tests for VMS_ARRAY_OF_POINTER_AUTO_ALLOC

Fabiano Rosas (1):
  vmstate: Stop checking size for nullptr compression

Peter Xu (9):
  vmstate: Pass in struct itself for VMSTATE_ARRAY_OF_POINTER
  vmstate: Pass in struct itself for VMSTATE_VARRAY_OF_POINTER_UINT32
  vmstate: Do not set size for VMS_ARRAY_OF_POINTER
  vmstate: Update max_elems early and check field compressable once
  vmstate: Rename VMS_NULLPTR_MARKER to VMS_MARKER_PTR_NULL
  vmstate: Introduce vmstate_save_field_with_vmdesc()
  vmstate: Allow vmstate_info_nullptr to emit non-NULL markers
  vmstate: Implement load of ptr marker in vmstate core
  vmstate: Implement VMS_ARRAY_OF_POINTER_AUTO_ALLOC

 include/hw/intc/riscv_aclint.h |   6 +-
 include/migration/vmstate.h    |  88 ++++++++++--
 migration/savevm.c             |  28 ++++
 migration/vmstate-types.c      |  36 ++---
 migration/vmstate.c            | 247 ++++++++++++++++++++++++++-------
 tests/unit/test-vmstate.c      |  90 +++++++++++-
 roms/seabios-hppa              |   2 +-
 scripts/analyze-migration.py   |  22 +--
 8 files changed, 418 insertions(+), 101 deletions(-)

-- 
2.50.1