[PATCH v6 0/2] Fix check-qtest-ppc64 sanitizer errors

[Akihiko Odaki]

I saw various sanitizer errors when running check-qtest-ppc64. While
I could just turn off sanitizers, I decided to tackle them this time.

Unfortunately, GLib versions older than 2.81.0 do not free test data in
some cases so some sanitizer errors remain. All sanitizer errors will be
gone with this patch series combined with the following change for GLib:
https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4120

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
---
Changes in v6:
- Avoid referring owner as "the object that tracks the region's
  reference count".
- Noted that memroy_region_ref() and memroy_region_unref() do nothing
  if the owner is not present.
- Explicitly stated that memory_region_unref() may destroy the owner
  along with the memory region itself.
- Link to v5: 
20250104-san-v5-0-8b430457b09d@daynix.com">https://lore.kernel.org/r/20250104-san-v5-0-8b430457b09d@daynix.com

Changes in v5:
- Rebased.
- Merged four patches to update inline documentation into one
- Link to v4: 
https://lore.kernel.org/r/20240823-san-v4-0-a24c6dfa4ceb@daynix.com

Changes in v4:
- Changed to create a reference to the subregion instead of its owner
  when its owner equals to the container's owner.
- Dropped R-b from patch "memory: Do not create circular reference with
  subregion".
- Rebased.
- Link to v3: 
https://lore.kernel.org/r/20240708-san-v3-0-b03f671c40c6@daynix.com

Changes in v3:
- Added patch "memory: Clarify that we use owner's reference count".
- Added patch "memory: Refer to docs/devel/memory.rst for 'owner'".
- Fixed the message of patch
  "memory: Do not create circular reference with subregion".
- Dropped patch "cpu: Free cpu_ases" in favor of:
  https://lore.kernel.org/r/20240607115649.214622-7-salil.mehta@huawei.com/
  ("[PATCH V13 6/8] physmem: Add helper function to destroy CPU
  AddressSpace")
- Dropped patches "hw/ide: Convert macio ide_irq into GPIO line" and
  "hw/ide: Remove internal DMA qemu_irq" in favor of commit efb359346c7a
  ("hw/ide/macio: switch from using qemu_allocate_irq() to qdev input
  GPIOs")
- Dropped patch "hw/isa/vt82c686: Define a GPIO line between vt82c686
  and i8259" in favor of:
  https://patchew.org/QEMU/20240704205854.18537-1-shentey@gmail.com/
  ("[PATCH 0/3] Resolve vt82c686 and piix4 qemu_irq memory leaks")
- Dropped pulled patches.
- Link to v2: 
https://lore.kernel.org/r/20240627-san-v2-0-750bb0946dbd@daynix.com

Changes in v2:
- Rebased to "[PATCH] cpu: fix memleak of 'halt_cond' and 'thread'".
  (Philippe Mathieu-Daudé)
- Converted IRQs into GPIO lines and removed one qemu_irq usage.
  (Peter Maydell)
- s/suppresses/fixes/ (Michael S. Tsirkin)
- Corrected title of patch "hw/virtio: Free vqs after vhost_dev_cleanup()"
  (was "hw/virtio: Free vqs before vhost_dev_cleanup()")
- Link to v1: 
https://lore.kernel.org/r/20240626-san-v1-0-f3cc42302189@daynix.com

---
Akihiko Odaki (2):
      memory: Update inline documentation
      memory: Do not create circular reference with subregion

 include/exec/memory.h | 59 ++++++++++++++++++++++++---------------------------
 system/memory.c       |  8 +++++--
 2 files changed, 34 insertions(+), 33 deletions(-)
---
base-commit: 38d0939b86e2eef6f6a622c6f1f7befda0146595
change-id: 20240625-san-097afaf4f1c2

Best regards,
-- 
Akihiko Odaki <akihiko.odaki@daynix.com>