[PATCH v1 0/2] virtio: PCI ERS permanent failure teardown for virtio-blk

[Xixin Liu]

Hi,

This series adds proper PCI AER error recovery handling 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, implements virtio-blk shutdown with blk_mark_disk_dead(),
and fail-fast guards in virtio_queue_rq.

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         | 39 +++++++++++++++++++++++++++++++
 drivers/virtio/virtio_pci_common.c | 47 ++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+)

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2.43.0