[PATCH v3 0/2] virtio: PCI AER error_detected and virtio-blk shutdown

[Xixin Liu <liuxixin@kylinos.cn>]

Hi,

This series fills in missing PCI AER callbacks on virtio-pci, and adds
matching virtio-blk pieces for queue_rq after VQ removal plus
system-shutdown teardown.

virtio-pci only registered reset_prepare/reset_done.  Without
.error_detected the recovery core votes NO_AER_DRIVER on the first
broadcast, and report_perm_failure_detected skips the driver callback
whenever overall status is not RECOVERED.  Patch 1 registers
.error_detected and .slot_reset: frozen/unknown call
virtio_device_reset_prepare() then NEED_RESET; after a successful PCI
reset, slot_reset restores config and calls virtio_device_reset_done();
perm_failure only virtio_break_device() and DISCONNECT.  AER bus reset
via pci_bus_error_reset does not invoke .reset_prepare, so quiesce and
restore for that path live in error_detected and slot_reset.  The
existing .reset_prepare and .reset_done still serve FLR.

Patch 2 fails new requests early in virtio_queue_rq when vqs were
removed during frozen reset_prepare.  It also registers
virtio_driver.shutdown for reboot and poweroff via virtio_dev_shutdown,
with freeze-before-break reclaim and blk_mark_disk_dead().

Changes since v2, thanks to Michael for the review:
- perm_failure: only virtio_break_device()
- default and frozen share one quiesce then NEED_RESET path
- Add .slot_reset to restore after successful AER PCI reset
- Drop PCI common to drv->shutdown wiring; virtio-blk .shutdown for
  system shutdown via virtio_dev_shutdown

Based on linux-next next-20260730.

Thanks,
Xixin Liu
---
Xixin Liu (2):
  virtio-pci: add error_detected and slot_reset for AER
  virtio-blk: add shutdown and fail queue_rq after VQ teardown

 drivers/block/virtio_blk.c         | 36 ++++++++++++++++++++++++++++++
 drivers/virtio/virtio_pci_common.c | 53 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 89 insertions(+)

-- 
2.43.0