Hi,

This patch series introduces support for error recovery for passthrough
PCI devices on System Z (s390x). This is the user space component for the Linux
kernel patches [1]. For QEMU on eventfd notification for PCI error from vfio-pci
driver we call the vfio error handler. We can use an architecture specific error
handler to override the default vfio error handler. 

For s390x specific error handler, we retrieve the architecture specific PCI error
information and inject the information into the guest. Once the guest receives
the error information, the guest drivers will drive the error recovery.
Typically recovery involves a device reset which translate to CLP
disable/enable cycle for the device.

I would appreciate some feedback on this patch series to understand if
such an approach is acceptable.

Thanks
Farhan

[1] https://lore.kernel.org/linux-s390/20250813170821.1115-1-alifm@linux.ibm.com/T/#m7c763e718501a2bbd77f0356f8845b77545d61e1

Farhan Ali (4):
  [NOTFORMERGE] linux-headers: Update for zpci vfio device
  vfio/pci: Add an architecture specific error handler
  s390x/pci: Add PCI error handling for vfio pci devices
  s390x/pci: Reset a device in error state

 hw/s390x/s390-pci-bus.c          | 12 +++++
 hw/s390x/s390-pci-vfio.c         | 88 ++++++++++++++++++++++++++++++++
 hw/vfio/pci.c                    |  5 ++
 hw/vfio/pci.h                    |  1 +
 include/hw/s390x/s390-pci-bus.h  |  1 +
 include/hw/s390x/s390-pci-vfio.h |  4 ++
 linux-headers/linux/vfio.h       |  2 +
 linux-headers/linux/vfio_zdev.h  |  5 ++
 8 files changed, 118 insertions(+)

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2.43.0