| Message ID | 20220524185907.140285-1-mjrosato@linux.ibm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | KVM: s390: enable zPCI for interpretive execution | expand |
On 5/24/22 2:58 PM, Matthew Rosato wrote: > 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. > QEMU v6 series: https://lore.kernel.org/kvm/20220524190305.140717-1-mjrosato@linux.ibm.com/
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