[v3,0/8] s390x/pci: zPCI interpretation support

Message

Matthew Rosato Feb. 4, 2022, 9:19 p.m. UTC

For QEMU, the majority of the work in enabling instruction interpretation
is handled via new VFIO ioctls to SET the appropriate interpretation and
interrupt forwarding modes, and to GET the function handle to use for
interpretive execution.  

This series implements these new ioctls, as well as adding 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 interrupt
delivery (default when interpretation is in use) or whether the host will
be responsible for delivering all interrupts (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.

Associated kernel series:
https://lore.kernel.org/kvm/[e-mail]/

Changelog v2->v3:
- Update kernel headers sync
- Add some R-bs (Thanks!)
- squash the fixup patch erroneously included in v2
- Re-word plug error message (Thomas)
- Change zpci option from interp to interpret (Thomas)
- Fix missing static inline (Pierre)
- Change zpci option from intassist to forwarding_assist (Pierre)
- Re-word s390_pci_get_aif comments and variables to better-explain
  what we are doing (Pierre)
- Note: no docs/system/s390x/zpci.rst with this series but this is not
  forgotten -- creating as a follow-on (Thomas)

Matthew Rosato (8):
  Update linux headers
  target/s390x: add zpci-interp to cpu models
  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: use I/O Address Translation assist when interpreting
  s390x/pci: use dtsm provided from vfio capabilities for interpreted
    devices
  s390x/pci: let intercept devices have separate PCI groups

 hw/s390x/s390-pci-bus.c                       | 124 ++++++++++-
 hw/s390x/s390-pci-inst.c                      | 168 +++++++++++++-
 hw/s390x/s390-pci-vfio.c                      | 206 +++++++++++++++++-
 hw/s390x/s390-virtio-ccw.c                    |   1 +
 include/hw/s390x/s390-pci-bus.h               |   8 +-
 include/hw/s390x/s390-pci-inst.h              |   2 +-
 include/hw/s390x/s390-pci-vfio.h              |  46 ++++
 include/standard-headers/asm-x86/kvm_para.h   |   1 +
 include/standard-headers/drm/drm_fourcc.h     |  11 +
 include/standard-headers/linux/ethtool.h      |   1 +
 include/standard-headers/linux/fuse.h         |  60 ++++-
 include/standard-headers/linux/pci_regs.h     | 142 ++++++------
 include/standard-headers/linux/virtio_iommu.h |   8 +-
 linux-headers/asm-generic/unistd.h            |   5 +-
 linux-headers/asm-mips/unistd_n32.h           |   2 +
 linux-headers/asm-mips/unistd_n64.h           |   2 +
 linux-headers/asm-mips/unistd_o32.h           |   2 +
 linux-headers/asm-powerpc/unistd_32.h         |   2 +
 linux-headers/asm-powerpc/unistd_64.h         |   2 +
 linux-headers/asm-s390/kvm.h                  |   1 +
 linux-headers/asm-s390/unistd_32.h            |   2 +
 linux-headers/asm-s390/unistd_64.h            |   2 +
 linux-headers/asm-x86/kvm.h                   |  19 +-
 linux-headers/asm-x86/unistd_32.h             |   1 +
 linux-headers/asm-x86/unistd_64.h             |   1 +
 linux-headers/asm-x86/unistd_x32.h            |   1 +
 linux-headers/linux/kvm.h                     |  18 ++
 linux-headers/linux/vfio.h                    |  22 ++
 linux-headers/linux/vfio_zdev.h               |  51 +++++
 target/s390x/cpu_features_def.h.inc           |   1 +
 target/s390x/gen-features.c                   |   2 +
 target/s390x/kvm/kvm.c                        |   1 +
 32 files changed, 817 insertions(+), 98 deletions(-)