[PATCH v2 0/3] KVM: riscv: add check_supported_reg() into get-reg-list test

[Yong-Xuan Wang]

This series addresses a bug in the SBI FWFT (Firmware Features) extension
where features could remain exposed to guests after their dependent ISA
extensions are disabled at runtime, and improves the related selftest
infrastructure.

The bug (patch 1) occurred because FWFT feature support was cached at vCPU
initialization time. When userspace subsequently disabled ISA extensions
via KVM ONE_REG, the cached support status was not updated, leading to
stale feature exposure.

The selftest improvements (patches 2-3) enhance the get-reg-list test by
refactoring the extension sublist infrastructure and splitting FWFT
feature testing into separate, properly-gated sublists.

---
Changes in v2:
- Fix FWFT stale feature exposure by removing static 'supported' field
- Refactor get-reg-list test to use unified extension sublist macros
- Split FWFT testing into per-feature sublists with runtime checks
(Andrew)

To: Anup Patel <anup at brainfault.org>
To: Atish Patra <atish.patra at linux.dev>
To: Paul Walmsley <pjw at kernel.org>
To: Palmer Dabbelt <palmer at dabbelt.com>
To: Albert Ou <aou at eecs.berkeley.edu>
To: Alexandre Ghiti <alex at ghiti.fr>
To: Clément Léger <cleger at rivosinc.com>
To: Andrew Jones <ajones at ventanamicro.com>
To: Paolo Bonzini <pbonzini at redhat.com>
To: Shuah Khan <shuah at kernel.org>
Cc: greentime.hu at sifive.com
Cc: vincent.chen at sifive.com
Cc: zong.li at sifive.com
Cc: kvm at vger.kernel.org
Cc: kvm-riscv at lists.infradead.org
Cc: linux-riscv at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-kselftest at vger.kernel.org

---
Yong-Xuan Wang (3):
      KVM: RISC-V: SBI FWFT: Fix stale feature exposure after runtime extension changes
      KVM: riscv: selftests: Refactor ISA and SBI extension sublist macros
      KVM: riscv: selftests: Split SBI FWFT into separate feature-specific sublists

 arch/riscv/include/asm/kvm_vcpu_sbi_fwft.h       |   1 -
 arch/riscv/kvm/vcpu_sbi_fwft.c                   |  17 ++-
 tools/testing/selftests/kvm/riscv/get-reg-list.c | 172 +++++++++++++++--------
 3 files changed, 119 insertions(+), 71 deletions(-)
---
base-commit: c7832534a8160276cccb9a8cc8cafb5614c579d0
change-id: 20260526-kvm-get_reg_list-v2-f9f36961ac6c