Supersedes: <20250828-san-v9-0-c0dff4b8a487@rsg.ci.i.u-tokyo.ac.jp>
("[PATCH v9 0/2] Fix check-qtest-ppc64 sanitizer errors")

Based-on: <20250906-use-v1-0-c51caafd1eb7@rsg.ci.i.u-tokyo.ac.jp>
("[PATCH 00/22] Fix memory region leaks and use-after-finalization")

MemoryRegions used to "piggyback" on their owners instead of using their
reference counters due to the circular dependencies between them, which
caused memory leak.

I tried to fix it with "[PATCH v9 0/2] Fix check-qtest-ppc64 sanitizer
errors" but it resulted in a lengthy discussion; ultimately it is
attributed to the fact that "piggybacking" is hard to understand and
forces us design trade-offs. It was also insufficient because it only
deals with the container/subregion pattern and did not deal with
AddressSpace and DMA. Fixing all possible memory leaks require checking
the referrer at many places where memory_region_ref() is called.

With this series, I remove the "piggyback" hack altogather.
The key insight here is that the unparented devices have the finalizable
MemoryRegions and they do not need them. I code the fact by calling
object_unparent() in device_unparent(). This eliminates the entire class
of memory leaks caused by references from owners to their MemoryRegions.

Signed-off-by: Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>
---
Changes in v2:
- Expanded the message of patch
  "vfio/pci: Do not unparent in instance_finalize()".
- Changed to exploit the unparenting timing instead of the unrealization
  timing.
- Link to v1: https://lore.kernel.org/qemu-devel/20250901-mr-v1-0-dd7cb6b1480b@rsg.ci.i.u-tokyo.ac.jp

---
Akihiko Odaki (3):
      qom: Do not finalize twice
      virtio-gpu-virgl: Add virtio-gpu-virgl-hostmem-region type
      memory: Stop piggybacking on memory region owners

 docs/devel/memory.rst         | 41 +++++++++++++++++-----------------
 include/qom/object.h          |  1 +
 include/system/memory.h       | 51 +++++++++++++++++++++----------------------
 hw/core/qdev.c                | 16 ++++++++++++++
 hw/display/virtio-gpu-virgl.c | 50 ++++++++++++++++++++++++++++++------------
 qom/object.c                  |  5 +++++
 system/memory.c               | 33 ++++++++++++++++++++--------
 7 files changed, 127 insertions(+), 70 deletions(-)
---
base-commit: e101d33792530093fa0b0a6e5f43e4d8cfe4581e
change-id: 20250831-mr-d0dc495bad11
prerequisite-message-id: <20250906-use-v1-0-c51caafd1eb7@rsg.ci.i.u-tokyo.ac.jp>
prerequisite-patch-id: d464fda86a3c79ff8e6d7a2e623d979b2a47019b
prerequisite-patch-id: 17b153237f69c898b9c5b93aad0d5116d0bfe49f
prerequisite-patch-id: a323f67e01c672ab2958a237ea54b77f1443e2d1
prerequisite-patch-id: 019969fe248bd57ddcda1ff5fc960b214ccffefe
prerequisite-patch-id: 74ded25b212b75b2f7d1859fedc601cf33d59107
prerequisite-patch-id: 43f841a1924749e2a5a3b74b35e54f89afb7e3c5
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prerequisite-patch-id: ff398fa97b5f2feee85372fdf108d82d8d5526b0
prerequisite-patch-id: 7ac446ae76e05dd267a63889ff775ac609712c31
prerequisite-patch-id: b49a74cd5f31348c3dc13dcfd1dad629e6b30387
prerequisite-patch-id: 8f61fe1b81cf3ec906ebbf61776573edd96c1e8c
prerequisite-patch-id: 01fb8ccbe7326021a94a8d7531189568d2e311a7
prerequisite-patch-id: 974b0fc6d7c8d6d56b8f44597260647e1a53cf38
prerequisite-patch-id: 55c4711a2a4e6b02b8b512e0283f8feaf7d3bfa3

Best regards,
--  
Akihiko Odaki <odaki@rsg.ci.i.u-tokyo.ac.jp>