On 6/6/22 4:33 PM, Matthew Rosato wrote:
Enable interpretive execution of zPCI instructions + adapter interruption forwarding for s390x KVM vfio-pci. This is done by triggering a routine when the VFIO group is associated with the KVM guest, transmitting to firmware a special token (GISA designation) to enable that specific guest for interpretive execution on that zPCI device. Load/store interpreation enablement is then controlled by userspace (based upon whether or not a SHM bit is placed in the virtual function handle). Adapter Event Notification interpretation is controlled from userspace via a new KVM ioctl. By allowing intepretation of zPCI instructions and firmware delivery of interrupts to guests, we can reduce the frequency of guest SIE exits for zPCI. From the perspective of guest configuration, you passthrough zPCI devices in the same manner as before, with intepretation support being used by default if available in kernel+qemu. Will follow up with a link the most recent QEMU series. Changelog v8->v9: - Rebase on top of 5.19-rc1, adjust ioctl and capability defines - s/kzdev = 0/kzdev = NULL/ (Alex) - rename vfio_pci_zdev_open to vfio_pci_zdev_open_device (Jason) - rename vfio_pci_zdev_release to vfio_pci_zdev_close_device (Jason) - make vfio_pci_zdev_close_device return void, instead WARN_ON or ignore errors in lower level function (kvm_s390_pci_unregister_kvm) (Jason) - remove notifier accidentally left in struct zpci_dev + associated include statment (Jason) - Remove patch 'KVM: s390: introduce CPU feature for zPCI Interpretation' based on discussion in QEMU thread.
Ping -- I'm hoping this can make the next merge window, but there are still 2 patches left without any review tag (16 & 17).
