Messages in this thread | | | From | Matthew Rosato <> | Subject | [PATCH v3 00/30] KVM: s390: enable zPCI for interpretive execution | Date | Fri, 4 Feb 2022 16:15:06 -0500 |
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Enable interpretive execution of zPCI instructions + adapter interruption forwarding for s390x KVM vfio-pci. This is done by introducing a series of new vfio-pci feature ioctls that are unique vfio-pci-zdev (s390x) and are used to negotiate the various aspects of zPCI interpretation setup. By allowing intepretation of zPCI instructions and firmware delivery of interrupts to guests, we can significantly reduce the frequency of guest SIE exits for zPCI. We then see additional gains by handling a hot-path instruction that can still intercept to the hypervisor (RPCIT) directly in kvm.
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 reply with a link to the associated QEMU series.
Changelog v2->v3: - More R-bs / ACKs (Thanks!) - Re-word patch 6 commit message (Claudio) - Patch 8 + some later patches: s/gd/gisa/ (Pierre) - Patch 12: remove !mdd check (Pierre) - some more virt/phys conversions (Pierre) - Patch 18: check more sclp bits & facilities during interp probe (Pierre) - Patch 21: fix fabricated status for some RPCIT intercept errors - Patch 25-27: remove get/set checks from feature ioctl handlers as they are already done in vfio core (Pierre) - Patch 26: s/aif/aif_float/ and s/fhost/aif_fhost/ - remove kvm_s390_pci_attach_kvm and just do the work inline (Pierre) - Use CONFIG_VFIO_PCI_ZDEV instead of CONFIG_PCI in Makefile and other code locations (Pierre) - Due to the above, re-arrange series order so CONFIG_VFIO_PCI_ZDEV is introduced earlier - s/aift->lock/aift->aift_lock/ (Pierre) - Break some AEN init code into local functions zpci_setup_aipb() and zpci_reset_aipb() (Pierre) - check for errors on kvm_s390_gisc_register (Pierre) - handle airq clear errors differently when we know the device is being removed vs any other reason aif is being disabled (Pierre) - s/ioat->lock/ioat->ioat_lock/ (Pierre) - Fix backout case in kvm_s390_pci_ioat_enable, re-arrange rc settings slightly (Pierre) - Add a CONFIG_VFIO_PCI_ZDEV check when determining if its safe to allow KVM_S390_VM_CPU_FEAT_ZPCI_INTERP (need both the facilities and the kvm/pci.o pieces to allow intepretation)
Matthew Rosato (30): 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: export some routines related to RPCIT processing s390/pci: stash dtsm and maxstbl s390/pci: add helper function to find device by handle s390/pci: get SHM information from list pci s390/pci: return status from zpci_refresh_trans vfio/pci: re-introduce CONFIG_VFIO_PCI_ZDEV 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 interpretation KVM: s390: pci: provide routines for enabling/disabling interrupt forwarding KVM: s390: pci: provide routines for enabling/disabling IOAT assist KVM: s390: pci: handle refresh of PCI translations KVM: s390: intercept the rpcit instruction vfio-pci/zdev: wire up group notifier vfio-pci/zdev: wire up zPCI interpretive execution support vfio-pci/zdev: wire up zPCI adapter interrupt forwarding support vfio-pci/zdev: wire up zPCI IOAT assist support vfio-pci/zdev: add DTSM to clp group capability KVM: s390: introduce CPU feature for zPCI Interpretation MAINTAINERS: additional files related kvm s390 pci passthrough
MAINTAINERS | 2 + arch/s390/include/asm/airq.h | 7 +- arch/s390/include/asm/kvm_host.h | 5 + arch/s390/include/asm/kvm_pci.h | 60 +++ arch/s390/include/asm/pci.h | 12 + arch/s390/include/asm/pci_clp.h | 11 +- arch/s390/include/asm/pci_dma.h | 3 + arch/s390/include/asm/pci_insn.h | 31 +- 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 | 95 +++- arch/s390/kvm/kvm-s390.c | 57 ++- arch/s390/kvm/kvm-s390.h | 10 + arch/s390/kvm/pci.c | 850 +++++++++++++++++++++++++++++++ arch/s390/kvm/pci.h | 60 +++ arch/s390/kvm/priv.c | 49 ++ arch/s390/pci/pci.c | 31 ++ arch/s390/pci/pci_clp.c | 28 +- arch/s390/pci/pci_dma.c | 7 +- arch/s390/pci/pci_insn.c | 15 +- arch/s390/pci/pci_irq.c | 48 +- drivers/iommu/s390-iommu.c | 4 +- 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 | 8 + drivers/vfio/pci/vfio_pci_zdev.c | 275 +++++++++- include/linux/vfio_pci_core.h | 42 +- include/uapi/linux/vfio.h | 22 + include/uapi/linux/vfio_zdev.h | 51 ++ 36 files changed, 1787 insertions(+), 65 deletions(-) create mode 100644 arch/s390/include/asm/kvm_pci.h create mode 100644 arch/s390/kvm/pci.c create mode 100644 arch/s390/kvm/pci.h
-- 2.27.0
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