[v4,0/5] s390: Enable AP instructions for pv-guests

Message

Steffen Eiden Aug. 23, 2023, 2:22 p.m. UTC

This series enables general QEMU support for AP pass-through for Secure
Execution guests (pv-guests).

To enable AP-PT on pv-guests QEMU has to turn on the corresponding bits
in the KVM CPU-model[1] if the CPU firmware supports it. However, it
only makes sense to turn on AP-PT if the QEMU user enabled (general) AP
for that guest.

See: https://lore.kernel.org/linux-s390/[e-mail]/T/#t

The series consists of five patches:
 1/2) fixes from Janosch for AP handling
 3) update kvm-s390 header for this series (NOTFORMERGE)
 4) small cleanup for kvm_s390_set_attr()
    refactor code to add ap_available() and ap_enabled()
 5) Add UV_CALL CPU model enablement

since v3:
  - nitfixes (Thomas)
  - r-b from Michael&Thomas

since v2:
  - add fixes for AP from Janosch
  - rename *UV_CALL* to UV_FEAT_GUEST (Janosch)
  - early return on some functions (Janosch)
  - add r-b from Michael (Patch 4)
  - mark linux header update as NOTFORMERGE

since v1:

- removed the new features from the default gen16 model
- updated KVM-headers to match KVM series v3 [1]
- applied review comments from Thomas


Steffen

Janosch Frank (2):
  s390x/ap: fix missing subsystem reset registration
  s390x: switch pv and subsystem reset ordering on reboot

Steffen Eiden (3):
  NOTFORMERGE update linux-headers/asm-s390/kvm.h
  target/s390x/kvm: Refactor AP functionalities
  target/s390x: AP-passthrough for PV guests

 hw/s390x/s390-virtio-ccw.c          |  7 ++-
 linux-headers/asm-s390/kvm.h        | 16 +++++
 target/s390x/cpu_features.h         |  1 +
 target/s390x/cpu_features_def.h.inc |  4 ++
 target/s390x/cpu_models.c           |  2 +
 target/s390x/gen-features.c         |  2 +
 target/s390x/kvm/kvm.c              | 94 ++++++++++++++++++++++++++---
 7 files changed, 116 insertions(+), 10 deletions(-)