Comment 0 for bug 1907656

Description: s390x/s390-virtio-ccw: Reset PCI devices during subsystem reset
Symptom: PCI devices are unavailable after a subsystem reset
Problem: When a subsystem reset event occurs (e.g. via kexec) PCI
               devices are not being reset and are therefore in an
               unexpected state when the guest attempts to enable them
               again after the subsystem reset. This results in the devices
               being unavailable to the guest until a reboot.
Solution: Add the s390 PCI host bridge to the list of devices to be
               reset during a subsystem reset event
Reproduction: kexec on an s390x guest with PCI devices

db08244a3a7e s390x/s390-virtio-ccw: Reset PCI devices during subsystem reset

This fix need to be applied to qemu for focal (20.04) and groovy (20.10).