RISCV: Add KVM_GET_REG_LIST API

KVM_GET_REG_LIST will dump all register IDs that are available to KVM_GET/SET_ONE_REG and It's very useful to identify some platform regression issue during VM migration.

Patch 1-7 re-structured the get-reg-list test in aarch64 to make some of the code as common test framework that can be shared by riscv.

Patch 8 move reject_set check logic to a function so as to check for different errno for different registers.
Patch 9 move finalize_vcpu back to run_test so that riscv can implement its specific operation.
Patch 10 change to do the get/set operation only on present-blessed list. Patch 11 add the skip_set facilities so that riscv can skip set operation on some registers.
Patch 12 enabled the KVM_GET_REG_LIST API in riscv.
patch 13 added the corresponding kselftest for checking possible register regressions.

The get-reg-list kvm selftest was ported from aarch64 and tested with Linux v6.5-rc3 on a Qemu riscv64 virt machine.

---
Changed since v5:
* Rebase to v6.5-rc3
* Minor fix for Andrew's comments

Andrew Jones (7):
KVM: arm64: selftests: Replace str_with_index with strdup_printf
KVM: arm64: selftests: Drop SVE cap check in print_reg
KVM: arm64: selftests: Remove print_reg's dependency on vcpu_config
KVM: arm64: selftests: Rename vcpu_config and add to kvm_util.h
KVM: arm64: selftests: Delete core_reg_fixup
KVM: arm64: selftests: Split get-reg-list test code
KVM: arm64: selftests: Finish generalizing get-reg-list

Haibo Xu (6):
KVM: arm64: selftests: Move reject_set check logic to a function
KVM: arm64: selftests: Move finalize_vcpu back to run_test
KVM: selftests: Only do get/set tests on present blessed list
KVM: selftests: Add skip_set facility to get_reg_list test
KVM: riscv: Add KVM_GET_REG_LIST API support
KVM: riscv: selftests: Add get-reg-list test

 Documentation/virt/kvm/api.rst                |   2 +-
 arch/riscv/kvm/vcpu.c                         | 375 +++++++++
 tools/testing/selftests/kvm/Makefile          |  13 +-
 .../selftests/kvm/aarch64/get-reg-list.c      | 554 ++-----------
 tools/testing/selftests/kvm/get-reg-list.c    | 401 +++++++++
 .../selftests/kvm/include/kvm_util_base.h     |  21 +
 .../selftests/kvm/include/riscv/processor.h   |   3 +
 .../testing/selftests/kvm/include/test_util.h |   2 +
 tools/testing/selftests/kvm/lib/test_util.c   |  15 +
 .../selftests/kvm/riscv/get-reg-list.c        | 780 ++++++++++++++++++
 10 files changed, 1670 insertions(+), 496 deletions(-)
 create mode 100644 tools/testing/selftests/kvm/get-reg-list.c
 create mode 100644 tools/testing/selftests/kvm/riscv/get-reg-list.c

2.34.1