[PATCH v9 00/21] KVM: s390: enable zPCI for interpretive execution

[Matthew Rosato <mjrosato@linux.ibm.com>]

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.

Matthew Rosato (21):
  s390/sclp: detect the zPCI load/store interpretation facility
  s390/sclp: detect the AISII facility
  s390/sclp: detect the AENI facility
  s390/sclp: detect the AISI facility
  s390/airq: pass more TPI info to airq handlers
  s390/airq: allow for airq structure that uses an input vector
  s390/pci: externalize the SIC operation controls and routine
  s390/pci: stash associated GISA designation
  s390/pci: stash dtsm and maxstbl
  vfio/pci: introduce CONFIG_VFIO_PCI_ZDEV_KVM
  KVM: s390: pci: add basic kvm_zdev structure
  KVM: s390: pci: do initial setup for AEN interpretation
  KVM: s390: pci: enable host forwarding of Adapter Event Notifications
  KVM: s390: mechanism to enable guest zPCI Interpretation
  KVM: s390: pci: provide routines for enabling/disabling interrupt
    forwarding
  KVM: s390: pci: add routines to start/stop interpretive execution
  vfio-pci/zdev: add open/close device hooks
  vfio-pci/zdev: add function handle to clp base capability
  vfio-pci/zdev: different maxstbl for interpreted devices
  KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices
  MAINTAINERS: additional files related kvm s390 pci passthrough

 Documentation/virt/kvm/api.rst   |  47 +++
 MAINTAINERS                      |   1 +
 arch/s390/include/asm/airq.h     |   7 +-
 arch/s390/include/asm/kvm_host.h |  23 ++
 arch/s390/include/asm/pci.h      |  11 +
 arch/s390/include/asm/pci_clp.h  |   9 +-
 arch/s390/include/asm/pci_insn.h |  29 +-
 arch/s390/include/asm/sclp.h     |   4 +
 arch/s390/include/asm/tpi.h      |  13 +
 arch/s390/kvm/Makefile           |   1 +
 arch/s390/kvm/interrupt.c        |  96 ++++-
 arch/s390/kvm/kvm-s390.c         |  83 +++-
 arch/s390/kvm/kvm-s390.h         |  10 +
 arch/s390/kvm/pci.c              | 690 +++++++++++++++++++++++++++++++
 arch/s390/kvm/pci.h              |  88 ++++
 arch/s390/pci/pci.c              |  16 +
 arch/s390/pci/pci_clp.c          |   7 +
 arch/s390/pci/pci_insn.c         |   4 +-
 arch/s390/pci/pci_irq.c          |  48 ++-
 drivers/s390/char/sclp_early.c   |   4 +
 drivers/s390/cio/airq.c          |  12 +-
 drivers/s390/cio/qdio_thinint.c  |   6 +-
 drivers/s390/crypto/ap_bus.c     |   9 +-
 drivers/s390/virtio/virtio_ccw.c |   6 +-
 drivers/vfio/pci/Kconfig         |  11 +
 drivers/vfio/pci/Makefile        |   2 +-
 drivers/vfio/pci/vfio_pci_core.c |  10 +-
 drivers/vfio/pci/vfio_pci_zdev.c |  35 +-
 include/linux/sched/user.h       |   3 +-
 include/linux/vfio_pci_core.h    |  12 +-
 include/uapi/linux/kvm.h         |  31 ++
 include/uapi/linux/vfio_zdev.h   |   7 +
 32 files changed, 1279 insertions(+), 56 deletions(-)
 create mode 100644 arch/s390/kvm/pci.c
 create mode 100644 arch/s390/kvm/pci.h

-- 
2.27.0