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    Subject[PATCH v8 00/22] KVM: s390: enable zPCI for interpretive execution
    Date
    Note: this version of the series is built on top of vfio -next:
    https://github.com/awilliam/linux-vfio/tree/next
    As it now depends on 'vfio: remove VFIO_GROUP_NOTIFY_SET_KVM' and its
    prereqs.
    Additionally, if you care to try testing this series on top of vfio -next
    you'll also want to pick up this fix:
    https://lore.kernel.org/kvm/20220519182929.581898-1-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 an updated QEMU series.

    Changelog v7->v8:
    - Fix ioctl documentation (Thomas)
    - remove copy_to_user from ioctl, was from old version (Thomas)
    - KVM_S390_ZPCIOP_REG_AEN: fail on undefined flags (Thomas)
    - kvm_s390_pci_zpci_reg_aen: cleanup hostflag setting (Thomas) and
    also fix an accidental bit inversion while at it
    - CONFIG_VFIO_PCI_ZDEV_KVM: add the 'say Y' that was accidentally left
    out of the help text (Jason)
    - Restructure the vfio-pci-zdev pieces on top of 'vfio: remove
    VFIO_GROUP_NOTIFY_SET_KVM' (Jason) - open_device/close_device will now
    call the kvm registration routines directly. Move the open_device call
    to vfio_pci_core_enable so that errors can be propogated. For parity,
    move the close_device call to vfio_pci_core_disable.

    Matthew Rosato (22):
    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
    KVM: s390: introduce CPU feature for zPCI Interpretation
    MAINTAINERS: additional files related kvm s390 pci passthrough

    Documentation/virt/kvm/api.rst | 46 ++
    MAINTAINERS | 1 +
    arch/s390/include/asm/airq.h | 7 +-
    arch/s390/include/asm/kvm_host.h | 26 ++
    arch/s390/include/asm/pci.h | 13 +
    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/include/uapi/asm/kvm.h | 1 +
    arch/s390/kvm/Makefile | 1 +
    arch/s390/kvm/interrupt.c | 96 ++++-
    arch/s390/kvm/kvm-s390.c | 87 +++-
    arch/s390/kvm/kvm-s390.h | 10 +
    arch/s390/kvm/pci.c | 695 +++++++++++++++++++++++++++++++
    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 | 11 +-
    drivers/vfio/pci/vfio_pci_zdev.c | 38 +-
    include/linux/sched/user.h | 3 +-
    include/linux/vfio_pci_core.h | 14 +-
    include/uapi/linux/kvm.h | 32 ++
    include/uapi/linux/vfio_zdev.h | 7 +
    33 files changed, 1300 insertions(+), 56 deletions(-)
    create mode 100644 arch/s390/kvm/pci.c
    create mode 100644 arch/s390/kvm/pci.h

    --
    2.27.0

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