[PATCH v2 0/2] virtio: PCI ERS permanent failure teardown for virtio-blk

Hi,

This series adds PCI AER error_detected for virtio-pci and completes
virtio-blk teardown when ERS reports pci_channel_io_perm_failure.

virtio-pci only registered reset_prepare/reset_done.  The recovery core
treats devices without error_detected as NO_AER_DRIVER and does not
deliver perm_failure to the driver after a failed recovery.  When bus
reset fails (reproduced on QEMU with DLLLA not set within 100 ms after
secondary bus reset), virtio-blk disks stay live even though virtqueues
may already have been torn down during the frozen phase.

Patch 1 registers error_detected (frozen quiesce + perm_failure notify).
Patch 2 calls the virtio driver shutdown hook from virtio-pci on
perm_failure and implements virtio-blk shutdown with blk_mark_disk_dead().

Changes since v1 (thanks for the review on v1):
- Disclose LLM help on the commit message (Assisted-by); ASCII only
- virtblk_shutdown: virtio_break_device() before flush_work()
- virtio_queue_rq: drop disk_live(); keep NULL vqs/vdev guards only
  (broken vq already fails in virtqueue_add)

Based on linux-next next-20260730.

Thanks,
Xixin Liu
---
Xixin Liu (2):
  virtio-pci: add error_detected for PCI AER recovery
  virtio-blk: mark disk dead on ERS permanent failure

 drivers/block/virtio_blk.c         | 31 ++++++++++++++++++++++++
 drivers/virtio/virtio_pci_common.c | 38 ++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)

-- 
2.43.0