[v6,0/8] s390x/pci: zPCI interpretation support

Message

Matthew Rosato May 24, 2022, 7:02 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.                                            
                                                                                
Associated kernel series:                                                       
https://lore.kernel.org/kvm/[e-mail]/                             
                       
Changelog v5->v6:
- Update linux headers (KVM_CAP_S390_ZPCI_OP changed)
- Move featoff to ccw_machine_7_0_instance_options() (Thomas)
- s390_pci_get_host_fh: s/unsigned int/uint32_t/ (Thomas)
- s390_pci_kvm_interp_allowed: add !s390_is_pv() check (Pierre)
- Fail guest SET PCI FN (enable) if we cannot get the host fh
  or if the retrieved host FH is not enabled (Pierre)
- bugfix: don't free msix if we never initialized it

Matthew Rosato (8):
  Update linux headers
  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             | 111 ++++++++++++++++++++++--
 hw/s390x/s390-pci-inst.c            |  56 +++++++++++-
 hw/s390x/s390-pci-kvm.c             |  53 ++++++++++++
 hw/s390x/s390-pci-vfio.c            | 129 +++++++++++++++++++++++-----
 hw/s390x/s390-virtio-ccw.c          |   1 +
 include/hw/s390x/s390-pci-bus.h     |   8 +-
 include/hw/s390x/s390-pci-kvm.h     |  38 ++++++++
 include/hw/s390x/s390-pci-vfio.h    |   5 ++
 linux-headers/asm-s390/kvm.h        |   1 +
 linux-headers/linux/kvm.h           |  32 +++++++
 linux-headers/linux/vfio.h          |   4 +-
 linux-headers/linux/vfio_zdev.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 +
 17 files changed, 426 insertions(+), 32 deletions(-)
 create mode 100644 hw/s390x/s390-pci-kvm.c
 create mode 100644 include/hw/s390x/s390-pci-kvm.h