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-al...@linux.ibm.com/ ChangeLog --------- v1 https://lore.kernel.org/qemu-devel/20250813174152.1238-1-al...@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
