[PATCH v3 0/9] KVM: arm64: selftests: Basic nested guest support

[Wei-Lin Chang]

Hi,

This is v3 of adding basic support for running nested guests (L2) in
kselftest. This time a framework for enabling stage-2 in the guest is
added, including the s2_mmu struct, s2 translation control setup, and
a stage-2 page table generator. Similar to L2 vCPU management, all
stage-2 work is done in the guest instead of userspace.

An additional shadow_stage2 test is added which leverages the framework
to run L2 with stage-2 enabled.

* Changes from v2 [1]:

  - Update vm_paddr_t to gpa_t, vm_vaddr_t to gva_t.

  - Added framework for enabling stage-2 in the guest.

  - Added shadow_stage2 test.

Thanks!

[1]: https://lore.kernel.org/kvmarm/20260412142216.3806482-1-weilin.chang@arm.com/

Wei-Lin Chang (9):
  KVM: arm64: selftests: Add GPR save/restore functions for NV
  KVM: arm64: selftests: Add helpers for guest hypervisors
  KVM: arm64: selftests: Add hello_nested basic NV selftest
  KVM: arm64: selftests: Enhance hello_nested test
  KVM: arm64: selftests: Add shadow_stage2 test
  KVM: arm64: selftests: shadow_stage2: Allocate L2 stack from dedicated
    pool
  KVM: arm64: selftests: shadow_stage2: Check supported stage-2 granule
    size
  KVM: arm64: selftests: Add infrastructure for using stage-2 in guest
  KVM: arm64: selftests: shadow_stage2: Turn on stage-2 translation for
    the nested guest

 tools/testing/selftests/kvm/Makefile.kvm      |   5 +
 .../selftests/kvm/arm64/hello_nested.c        | 134 +++++++++
 .../selftests/kvm/arm64/shadow_stage2.c       | 165 +++++++++++
 .../selftests/kvm/include/arm64/nested.h      |  85 ++++++
 tools/testing/selftests/kvm/lib/arm64/entry.S | 137 +++++++++
 .../selftests/kvm/lib/arm64/hyp-entry.S       |  77 +++++
 .../testing/selftests/kvm/lib/arm64/nested.c  | 264 ++++++++++++++++++
 7 files changed, 867 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/arm64/hello_nested.c
 create mode 100644 tools/testing/selftests/kvm/arm64/shadow_stage2.c
 create mode 100644 tools/testing/selftests/kvm/include/arm64/nested.h
 create mode 100644 tools/testing/selftests/kvm/lib/arm64/entry.S
 create mode 100644 tools/testing/selftests/kvm/lib/arm64/hyp-entry.S
 create mode 100644 tools/testing/selftests/kvm/lib/arm64/nested.c

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2.43.0