[K][PULL] Enhanced Interpretation for PCI Functions on s390x

[frank.heimes at canonical.com]

BugLink: https://bugs.launchpad.net/bugs/1853306

The PCI Passthrough implementation is based on intercepting PCI I/O
instructions which leads to a reduced I/O performance compared to execution
of PCI instructions in LPAR.
For improved performance the interpretive execution of the PCI store and
PCI load instructions got enabled.
Further improvement is achieved by enabling the Adapter-Event-Notification.

---

The following changes since commit 71aba617e9773a80b4aaf384cd63cf74997025e6:

  s390/pci: allow zPCI zbus without a function zero (2022-09-20 16:05:56 +0200)

are available in the Git repository at:

  https://git.launchpad.net/~fheimes/+git/lp1853306/ 743e8793343a5f27d10ebd82f160c93568fa96af

for you to fetch changes up to 743e8793343a5f27d10ebd82f160c93568fa96af:

  KVM: s390: pci: Hook to access KVM lowlevel from VFIO (2022-09-20 19:26:05 +0200)

----------------------------------------------------------------
Bagas Sanjaya (1):
      Documentation: kvm: extend KVM_S390_ZPCI_OP subheading underline

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

Pierre Morel (1):
      KVM: s390: pci: Hook to access KVM lowlevel from VFIO

 Documentation/virt/kvm/api.rst   |  47 +++
 MAINTAINERS                      |   1 +
 arch/s390/include/asm/airq.h     |   7 +-
 arch/s390/include/asm/kvm_host.h |  18 +
 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              | 694 +++++++++++++++++++++++++++++++++++++++
 arch/s390/kvm/pci.h              |  88 +++++
 arch/s390/pci/Makefile           |   2 +-
 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 +--
 arch/s390/pci/pci_kvm_hook.c     |  11 +
 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 |  39 ++-
 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 +
 34 files changed, 1294 insertions(+), 57 deletions(-)
 create mode 100644 arch/s390/kvm/pci.c
 create mode 100644 arch/s390/kvm/pci.h
 create mode 100644 arch/s390/pci/pci_kvm_hook.c