RISCV: Add KVM_GET_REG_LIST API [LWN.net]

From:		Haibo Xu <haibo1.xu-AT-intel.com>
To:		unlisted-recipients:; (no To-header on input)
Subject:		[PATCH v6 00/13] RISCV: Add KVM_GET_REG_LIST API
Date:		Tue, 25 Jul 2023 16:41:26 +0800
Message-ID:		<cover.1690273969.git.haibo1.xu@intel.com>
Cc:		xiaobo55x-AT-gmail.com, haibo1.xu-AT-intel.com, ajones-AT-ventanamicro.com, maz-AT-kernel.org, oliver.upton-AT-linux.dev, seanjc-AT-google.com, Paolo Bonzini <pbonzini-AT-redhat.com>, Jonathan Corbet <corbet-AT-lwn.net>, Anup Patel <anup-AT-brainfault.org>, Atish Patra <atishp-AT-atishpatra.org>, Paul Walmsley <paul.walmsley-AT-sifive.com>, Palmer Dabbelt <palmer-AT-dabbelt.com>, Albert Ou <aou-AT-eecs.berkeley.edu>, Shuah Khan <shuah-AT-kernel.org>, James Morse <james.morse-AT-arm.com>, Suzuki K Poulose <suzuki.poulose-AT-arm.com>, Zenghui Yu <yuzenghui-AT-huawei.com>, Ricardo Koller <ricarkol-AT-google.com>, Vishal Annapurve <vannapurve-AT-google.com>, Like Xu <likexu-AT-tencent.com>, Vipin Sharma <vipinsh-AT-google.com>, David Matlack <dmatlack-AT-google.com>, Colton Lewis <coltonlewis-AT-google.com>, kvm-AT-vger.kernel.org, linux-doc-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, kvm-riscv-AT-lists.infradead.org, linux-riscv-AT-lists.infradead.org, linux-kselftest-AT-vger.kernel.org, linux-arm-kernel-AT-lists.infradead.org, kvmarm-AT-lists.linux.dev
Archive-link:		Article

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

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