[PATCH v18 00/12] ALSA: virtio: fix capture lifetime and accounting

[Joonho Lee <mynameisjune111@gmail.com>]

Hi Takashi,

This cumulative resend keeps the twelve-patch series on the same base,
a4311e9447bbb219044db38897f95be112f46a8a. It covers PCM stop-threshold
sampling, locked partial-progress reporting, the optional reset operation,
VirtIO ACK error propagation and recovery, PCM and control DMA ownership,
signal-safe teardown, staged capture lifecycle and work prioritization, and
capture parameter documentation.

Relative to v17, patch 4 adds the transfer-failure XRUN latch so later
completions do not advance PCM accounting after a failed ACK. The existing
ACK and prepare recovery behavior is retained. Patch 6's partial-restore
rollback and event-message ownership fixes, and patch 9's wait-result type
fix, are carried forward unchanged from v17. Patch 7 retains PCM DMA lifetime
and fixed-slot completion checks, and now reserves the successfully seeded
ordinary capture ring until userspace advances appl_ptr. Patch 10 retains the
staged capture lifecycle and paused linked-stream XRUN handling, and restores
full-ring accounting after active and native paused RESET requeues completed
requests.

Validation:

- Cumulative stages 04–12 passed incremental ARM64 W=1 builds with KASAN,
  lockdep, and OSS PCM enabled.
- The no-hook production candidate passed ordinary and staged RW/MMAP QEMU
  capture. The 14-capture sequence verifier passed across both modes,
  including RESET/reopen boundaries.
- A slow-reader QEMU oracle reproduces unread-period overwrite on upstream
  a4311e9 and v17. The candidate keeps the ring slice unchanged until
  appl_ptr advances. Separate active and paused RESET pairs reproduce the
  same baseline issue and show the candidate preserving the unread slice.
- Synthetic ACK-failure QEMU probes cover capture, playback, and DRAINING
  admission. Subsequent virtqueue completions and recovery paths were also
  exercised.
- An exact ALSA-helper model covers partial-period capture accounting.
- MMIO rollback, timeout-width, PCI remove/reprobe, and linked paused-XRUN
  evidence is inherited from the validated v17 candidate for source paths
  unchanged by v18; the manifest identifies those inherited checks.

These are guest QEMU and host-model results. ACK failures were injected by
test-only hooks; the returned VirtIO completions were real QEMU events.
Physical Virtualization.framework devices and KCSAN were not tested.

Previous version:
https://lore.kernel.org/linux-sound/20261105070845.6449-1-mynameisjune111@gmail.com/

AI assistance was used for analysis, implementation, and test preparation.
Assisted-by: LLM

Thanks,
Joonho

base-commit: a4311e9447bbb219044db38897f95be112f46a8a