[PATCH v2 0/4] Error recovery for zPCI passthrough devices

[Farhan Ali <alifm@linux.ibm.com>]

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.

Thanks
Farhan

[1] https://lore.kernel.org/all/20250825171226.1602-1-alifm@linux.ibm.com/

ChangeLog
---------
v1 https://lore.kernel.org/qemu-devel/20250813174152.1238-1-alifm@linux.ibm.com/
v1 -> v2
   - Use VFIO_DEVICE_FEATURE ioctl to get device error information.
   (Based on Alex's feedback on kernel series)

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         | 82 ++++++++++++++++++++++++++++++++
 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       | 14 ++++++
 7 files changed, 119 insertions(+)

-- 
2.43.0