s390/pci: Store PCI error information for passthrough devices

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For a passthrough device we need co-operation from user space to recover
the device. This would require to bubble up any error information to user
space.  Let's store this error information for passthrough devices, so it
can be retrieved later.

We can now have userspace drivers (vfio-pci based) on s390x. The userspace
drivers will not have any KVM fd and so no kzdev associated with them. So
we need to update the logic for detecting passthrough devices to not depend
on struct kvm_zdev.

Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Link: https://lore.kernel.org/r/20260630165553.725-2-alifm@linux.ibm.com
Signed-off-by: Alex Williamson <alex@shazbot.org>

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Farhan Ali 2026-06-30 09:55:51 -07:00 • committed by Alex Williamson

parent 9a333aabff

commit 9f240376d0

4 changed files with 113 additions and 54 deletions

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30

arch/s390/include/asm/pci.h

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1

arch/s390/pci/pci.c

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118

arch/s390/pci/pci_event.c

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18

drivers/vfio/pci/vfio_pci_zdev.c

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