[v5,0/9] s390x/pci: zPCI interpretation support

Message

Matthew Rosato April 4, 2022, 6:17 p.m. UTC

For QEMU, the majority of the work in enabling instruction interpretation       
is handled via SHM bit settings (to indicate to firmware whether or not
interpretive execution facilities are to be used) + a new KVM ioctl is
used to setup firmware-interpreted forwarding of Adapter Event
Notifications.                                        
                                                                                
This series also adds a new, optional 'interpret' parameter to zpci which       
can be used to disable interpretation support (interpret=off) as well as        
an 'forwarding_assist' parameter to determine whether or not the firmware       
assist will be used for adapter event delivery (default when
interpretation is in use) or whether the host will be responsible for
delivering all adapter event notifications (forwarding_assist=off).
                                                                                
The ZPCI_INTERP CPU feature is added beginning with the z14 model to            
enable this support.                                                            
                                                                                
As a consequence of implementing zPCI interpretation, ISM devices now           
become eligible for passthrough (but only when zPCI interpretation is           
available).                                                                     
                                                                                
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 kernel series.                                                                                
                       
Changelog v4->v5:
- Update to match latest interface from kernel code.  Major changes are:
  1) we no longer issue any ioctls to set a device to interpreted mode;
  rather, this will be done automatically if supported by the host kernel
  at the time the vfio group is associated with the KVM.  Then, the SHM
  bit setting will indicate whether or not interpretation is actually
  used.
  2) the RPCIT enhancments (IOMMU changes) are removed from this series,
  so the code associated with indicating a desired IOMMU are also
  removed.  With this series s390x-pci will continue to use only type1
  IOMMU for now.
- Refresh the linux headers sync.  Added a patch to tolerate some vfio
  uapi renames that will happen in 5.18 (this can be discarded if there
  is something else underway to address this)

Matthew Rosato (9):
  Update linux headers
  vfio: tolerate migration protocol v1 uapi renames
  target/s390x: add zpci-interp to cpu models
  s390x/pci: add routine to get host function handle from CLP info
  s390x/pci: enable for load/store intepretation
  s390x/pci: don't fence interpreted devices without MSI-X
  s390x/pci: enable adapter event notification for interpreted devices
  s390x/pci: let intercept devices have separate PCI groups
  s390x/pci: reflect proper maxstbl for groups of interpreted devices

 hw/s390x/meson.build                          |   1 +
 hw/s390x/s390-pci-bus.c                       | 107 ++++-
 hw/s390x/s390-pci-inst.c                      |  52 ++-
 hw/s390x/s390-pci-kvm.c                       |  51 +++
 hw/s390x/s390-pci-vfio.c                      | 129 +++++-
 hw/s390x/s390-virtio-ccw.c                    |   1 +
 hw/vfio/common.c                              |   2 +-
 hw/vfio/migration.c                           |  19 +-
 include/hw/s390x/s390-pci-bus.h               |   8 +-
 include/hw/s390x/s390-pci-kvm.h               |  38 ++
 include/hw/s390x/s390-pci-vfio.h              |   6 +
 .../linux/input-event-codes.h                 |   4 +-
 .../standard-headers/linux/virtio_config.h    |   6 +
 .../standard-headers/linux/virtio_crypto.h    |  82 +++-
 linux-headers/asm-arm64/kvm.h                 |  16 +
 linux-headers/asm-generic/mman-common.h       |   2 +
 linux-headers/asm-mips/mman.h                 |   2 +
 linux-headers/asm-s390/kvm.h                  |   1 +
 linux-headers/linux/kvm.h                     |  50 ++-
 linux-headers/linux/psci.h                    |   4 +
 linux-headers/linux/userfaultfd.h             |   8 +-
 linux-headers/linux/vfio.h                    | 406 +++++++++---------
 linux-headers/linux/vfio_zdev.h               |   7 +
 linux-headers/linux/vhost.h                   |   7 +
 target/s390x/cpu_features_def.h.inc           |   1 +
 target/s390x/gen-features.c                   |   2 +
 target/s390x/kvm/kvm.c                        |   8 +
 target/s390x/kvm/kvm_s390x.h                  |   1 +
 28 files changed, 763 insertions(+), 258 deletions(-)
 create mode 100644 hw/s390x/s390-pci-kvm.c
 create mode 100644 include/hw/s390x/s390-pci-kvm.h