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. Some minor changes are already suggested for the QEMU series, but for now the v5 one is still compatible (with one exception: in linux-headers/linux/kvm.h KVM_CAP_S390_ZPCI_OP is now changed to 216) https://lore.kernel.org/kvm/20220404181726.60291-1-mjrosato@xxxxxxxxxxxxx/ Changelog v6->v7: - Add some more R-b tags - Mark a few routines static (kernel bot) - Add a few lockdep_assert_held calls (Christian) - Add a new condition under which locked_vm is defined (Christian) - After discussions with Jason, let's go back to using a Kconfig option to control vfio-pci-zdev inclusion so we can avoid some symbol_get messiness. The name was chosen so that we can re-introduce zdev for non-KVM environments in the future, should it be needed. - Since we re-introduce a Kconfig option, we can go back to using this in various places instead of CONFIG_VFIO_PCI. - Expose separate interfaces for register and unregister of kvm (Jason) - Cleanup KVM association during zdev device_close; if the device fd is closed before we receive the kvm notifier, we will never see the notification because we unregister it, but cleanup must still be done. Conversely, if the kvm fd closes before the device is closed, we should get the NULL notifier from kvm_destroy_devices since the notifier has not yet been unregistered. - As a result of the above, we no longer need to clear the pci list during vm exit. But to be safe let's WARN_ON_ONCE if it's found to be non-empty during free_vm. - Add kzdev_lock to protect the kzdev - uapi KVM_CAP_S390_ZPCI_OP moved to 216 (previously 214) 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 | 45 ++ 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 | 94 ++++- arch/s390/kvm/kvm-s390.h | 10 + arch/s390/kvm/pci.c | 686 +++++++++++++++++++++++++++++++ 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 | 2 + drivers/vfio/pci/vfio_pci_zdev.c | 65 ++- 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 + 33 files changed, 1313 insertions(+), 55 deletions(-) create mode 100644 arch/s390/kvm/pci.c create mode 100644 arch/s390/kvm/pci.h -- 2.27.0
