[PATCH v1 00/26] KVM: arm64 on s390 System Register Handling
Claudio Imbrenda
imbrenda at linux.ibm.com
Mon Jun 1 08:52:16 PDT 2026
On Fri, 29 May 2026 17:55:33 +0200
Steffen Eiden <seiden at linux.ibm.com> wrote:
> Add system register handling for KVM/arm64 on s390. Restructure and share
> KVM/arm64 code, introduce ARM guest management functions for s390 hosts,
> and implement host sysreg & exception handling.
>
> Changes in detail:
>
> arm64:
>
> Refactor arm64 feature detection and ID register handling to make it
> generic and reusable across architectures.
>
> Restructure ID register storage and core register handling. Refactor core
> registers to use functions instead of direct memory access.
>
> Move arm64-specific definitions (CPU types, cache, KVM features, ID
> registers, system registers) to shared locations for reuse by other
> architectures.
>
> 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 v3[1] as base.
the series is now conveniently available on the sae branch on
https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git
>
> Steffen
>
> [1] https://lore.kernel.org/lkml/20260529155050.2902245-1-seiden@linux.ibm.com/
>
> Andreas Grapentin (1):
> KVM: arm64: Fix set_oslsr_el1 to write to OSLAR_EL1
>
> Steffen Eiden (25):
> KVM: arm64: Extract some feature related changes to kvm_feature.h
> KVM: arm64: Remove __expand_field_sign_(un)signed
> KVM: arm64: Generalize get_idreg_field_*()
> KVM: arm64: Generalize kvm_cmp_feat_*()
> KVM: arm64: Generalize kvm_has_feat_*
> KVM: arm64: Remove get_idreg_field_*() and kvm_cmp_feat_*()
> KVM: arm64: Remove kvm_has_feat_range
> KVM: arm64: Split up feature sysreg sanitisation
> KVM: arm64: Refactor idreg caching into dedicated structure
> KVM: arm64: Move definitions from sys_regs.c to sys_regs.h
> KVM: arm64: Add PVM_ prefix to avoid name collisions
> s390: Introduce read/write ARM sysreg instructions
> s390: Introduce Query Available Arm features
> s390: Add functions to query arm guest time
> KVM: s390: arm64: Add sysreg related functions and definitions
> arm64: Extract cputype definitions.
> arm64: Extract cache definitions
> KVM: arm64: Share KVM feature detection macros
> KVM: arm64: Share ID reg handling
> KVM: arm64: Share sys-reg handling
> KVM: arm64: Refactor core reg handling
> KVM: s390: arm64: Implement feature sanitisation
> KVM: s390: arm64: Implement sysreg handling
> KVM: s390: arm64: Implement exception injection
> KVM: s390: arm64: Finalize page fault handling
>
> arch/arm64/include/asm/cache.h | 19 +-
> arch/arm64/include/asm/cputype.h | 246 +---
> arch/arm64/include/asm/kvm_emulate.h | 1 +
> arch/arm64/include/asm/kvm_feature.h | 27 +
> arch/arm64/include/asm/kvm_host.h | 137 +-
> arch/arm64/include/asm/kvm_nested.h | 1 +
> arch/arm64/kvm/arm.c | 2 +-
> arch/arm64/kvm/at.c | 1 +
> arch/arm64/kvm/config.c | 3 +-
> arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 1 +
> arch/arm64/kvm/hyp/nvhe/hyp-main.c | 1 +
> arch/arm64/kvm/hyp/nvhe/pkvm.c | 7 +-
> arch/arm64/kvm/hyp/nvhe/sys_regs.c | 55 +-
> arch/arm64/kvm/nested.c | 2 +-
> arch/arm64/kvm/sys_regs.c | 1307 +----------------
> arch/arm64/kvm/sys_regs.h | 276 ----
> arch/arm64/kvm/trace_handle_exit.h | 36 +-
> arch/arm64/kvm/vgic-sys-reg-v3.c | 2 +-
> arch/arm64/kvm/vgic/vgic-init.c | 1 +
> arch/arm64/kvm/vgic/vgic.h | 1 +
> arch/s390/include/asm/kvm_emulate.h | 34 +
> arch/s390/include/asm/kvm_feature.h | 111 ++
> arch/s390/include/asm/kvm_host_arm64.h | 168 ++-
> arch/s390/include/asm/kvm_host_arm64_types.h | 97 ++
> arch/s390/include/asm/kvm_nested.h | 5 +
> arch/s390/include/asm/sae-asm.h | 48 +
> arch/s390/include/asm/sae.h | 86 ++
> arch/s390/include/asm/timex.h | 49 +
> arch/s390/kernel/dis.c | 1 +
> arch/s390/kernel/time.c | 1 +
> arch/s390/kvm/arm64/Makefile | 3 +
> arch/s390/kvm/arm64/arm.c | 44 +-
> arch/s390/kvm/arm64/exception.c | 105 ++
> arch/s390/kvm/arm64/feature.c | 170 +++
> arch/s390/kvm/arm64/guest.c | 20 +-
> arch/s390/kvm/arm64/handle_exit.c | 1 +
> arch/s390/kvm/arm64/inject_fault.c | 72 +-
> arch/s390/kvm/arm64/mmu.c | 62 +-
> arch/s390/kvm/arm64/reset.c | 5 +
> arch/s390/kvm/arm64/sys_regs.c | 769 ++++++++++
> arch/s390/kvm/arm64/trace.h | 33 +
> arch/s390/tools/opcodes.txt | 3 +
> include/arch/arm64/asm/cache-defs.h | 22 +
> .../arch/arm64/asm/cputype-defs.h | 92 +-
> include/arch/arm64/asm/sysreg-defs.h | 9 +
> include/kvm/arm64/kvm_feature.h | 68 +
> include/kvm/arm64/kvm_host.h | 52 +
> include/kvm/arm64/sys_regs.h | 548 +++++++
> virt/kvm/arm64/Makefile.kvm | 1 +
> virt/kvm/arm64/guest.c | 100 +-
> virt/kvm/arm64/mmio.c | 1 +
> virt/kvm/arm64/sys_regs.c | 1039 +++++++++++++
> virt/kvm/arm64/trace.h | 34 +
> 53 files changed, 3838 insertions(+), 2141 deletions(-)
> create mode 100644 arch/arm64/include/asm/kvm_feature.h
> delete mode 100644 arch/arm64/kvm/sys_regs.h
> create mode 100644 arch/s390/include/asm/kvm_feature.h
> create mode 100644 arch/s390/include/asm/sae-asm.h
> 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/sys_regs.c
> create mode 100644 arch/s390/kvm/arm64/trace.h
> create mode 100644 include/arch/arm64/asm/cache-defs.h
> copy arch/arm64/include/asm/cputype.h => include/arch/arm64/asm/cputype-defs.h (85%)
> create mode 100644 include/kvm/arm64/kvm_feature.h
> create mode 100644 include/kvm/arm64/sys_regs.h
> create mode 100644 virt/kvm/arm64/sys_regs.c
>
>
> base-commit: 4095afb932d1a98a6fcb3f4f490964949d0de338
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