[PATCH v2 00/20] KVM: arm64 on s390 System Register Handling

[Steffen Eiden]

Add system register handling for KVM/arm64 on s390. Share KVM/arm64 code,
introduce ARM guest management functions for s390 hosts, and implement host
sysreg & exception handling.

This is a complete rework of v1 using sharing markers and not moving code to a
shared location.

Changes in detail:

arm64:

Refactor the id register fields in arch_vcpu into a dedicated structure such
that it can be reused by s390. Refactor detection of the number of sysregs.
Mark sysreg related code as shared.

s390:

Add s390 instruction support for ARM guest management: easr/sasr for
system register access, QAAF for feature queries, and ptff extensions
for guest time handling.

Implement complete sysreg handling for s390 including feature
sanitisation, register enumeration and access, exception injection,
and finalized page fault handling.

The series builds upon the foundation established in the first series and
requires the first series v7[1] as base. A branch at kernel.org is available [2].

Some in-between steps will trigger compile warnings (mostly unused warnings in
shared code) but of course always compile. After the last commit of this series
will trigger no compiler warnings.

	Steffen

[1] https://lore.kernel.org/all/20260831144802.834315-1-seiden@linux.ibm.com/
[2] https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git/log/?h=sae

Steffen Eiden (20):
  KVM: arm64: Refactor idreg caching into dedicated structure
  KVM: arm64: Extract number of sys_reg_desc into a constant
  arm64: sysreg: Define OSLSR_EL1_OSLK_MASK
  arm64: Share more arm64 headers with s390
  KVM: s390: arm64: Prepare for sharing more arm64 code
  KVM: arm64: Prepare sys_regs.c for sharing with s390
  KVM: arm64: Share more arm64 code with s390
  s390: tools: Allow sharing arm64/kvm headers
  s390: Introduce read/write ARM sysreg instructions
  s390: Add functions to query arm guest time
  KVM: s390: arm64: Query Available Arm features
  KVM: s390: arm64: Implement feature sanitisation
  KVM: s390: arm64: Implement arm sysreg managing infrastructure
  KVM: s390: arm64: Integrate sysreg into the host
  KVM: s390: arm64: Use QAAF init save area
  KVM: s390: arm64: Implement exception injection
  KVM: s390: arm64: Finalize page fault handling
  KVM: s390: arm64: Implement SVE for arm guests
  KVM: s390: arm64: Promote PTRAUTH capability
  s390: Report AEF features to sysfs

 arch/arm64/include/asm/cache.h               |   3 +
 arch/arm64/include/asm/cputype.h             |   3 +
 arch/arm64/include/asm/kvm_emulate.h         |   5 +-
 arch/arm64/include/asm/kvm_host.h            |  68 +-
 arch/arm64/include/asm/spectre.h             |   7 +
 arch/arm64/include/asm/sysreg.h              |   1 +
 arch/arm64/kvm/arm.c                         |   3 +
 arch/arm64/kvm/config.c                      |   2 +-
 arch/arm64/kvm/guest.c                       |  11 +-
 arch/arm64/kvm/hyp/nvhe/pkvm.c               |   7 +-
 arch/arm64/kvm/hyp/nvhe/sys_regs.c           |   4 +-
 arch/arm64/kvm/sys_regs.c                    | 164 ++--
 arch/arm64/kvm/sys_regs.h                    |   1 +
 arch/s390/include/arm64/kvm_hyp.h            |  18 +
 arch/s390/include/arm64/kvm_nested.h         |   5 +
 arch/s390/include/arm64/sys_regs.h           |   9 +
 arch/s390/include/asm/aef.h                  |  28 +
 arch/s390/include/asm/kvm_host_arm64.h       | 237 +++++-
 arch/s390/include/asm/kvm_host_arm64_types.h | 111 +++
 arch/s390/include/asm/sae-asm.h              |  48 ++
 arch/s390/include/asm/sae.h                  |  83 ++
 arch/s390/include/asm/timex.h                |  49 ++
 arch/s390/kernel/Makefile                    |   2 +-
 arch/s390/kernel/aef.c                       | 187 +++++
 arch/s390/kernel/dis.c                       |   1 +
 arch/s390/kvm/arm64/Makefile                 |   5 +
 arch/s390/kvm/arm64/Makefile.gen             |   1 +
 arch/s390/kvm/arm64/arm.c                    |  73 +-
 arch/s390/kvm/arm64/exception.c              | 105 +++
 arch/s390/kvm/arm64/feature.c                | 190 +++++
 arch/s390/kvm/arm64/feature.h                | 102 +++
 arch/s390/kvm/arm64/guest.c                  | 222 +++++-
 arch/s390/kvm/arm64/handle_exit.c            |   1 +
 arch/s390/kvm/arm64/inject_fault.c           |  73 +-
 arch/s390/kvm/arm64/mmu.c                    |  68 +-
 arch/s390/kvm/arm64/qaaf.c                   |  74 ++
 arch/s390/kvm/arm64/qaaf.h                   |  11 +
 arch/s390/kvm/arm64/reset.c                  |  69 +-
 arch/s390/kvm/arm64/spectre.c                |  14 +
 arch/s390/kvm/arm64/sys_regs.c               | 750 +++++++++++++++++++
 arch/s390/kvm/arm64/trace.h                  |  51 ++
 arch/s390/tools/Makefile.arm64h              |  11 +-
 arch/s390/tools/opcodes.txt                  |   3 +
 43 files changed, 2724 insertions(+), 156 deletions(-)
 create mode 100644 arch/s390/include/arm64/kvm_hyp.h
 create mode 100644 arch/s390/include/arm64/sys_regs.h
 create mode 100644 arch/s390/include/asm/aef.h
 create mode 100644 arch/s390/include/asm/sae-asm.h
 create mode 100644 arch/s390/kernel/aef.c
 create mode 100644 arch/s390/kvm/arm64/exception.c
 create mode 100644 arch/s390/kvm/arm64/feature.c
 create mode 100644 arch/s390/kvm/arm64/feature.h
 create mode 100644 arch/s390/kvm/arm64/qaaf.c
 create mode 100644 arch/s390/kvm/arm64/qaaf.h
 create mode 100644 arch/s390/kvm/arm64/spectre.c
 create mode 100644 arch/s390/kvm/arm64/sys_regs.c


base-commit: ab80750cee6e09e0036ac43f257059122a05a71d
-- 
2.53.0