linux-kernel - [PATCH v2 0/6] KVM: x86: Use kernel x86 cpuid utilities in KVM selftests

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Date:   Wed, 28 Apr 2021 12:37:50 -0700
From:   Ricardo Koller <ricarkol@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Ricardo Koller <ricarkol@...gle.com>
Subject: [PATCH v2 0/6] KVM: x86: Use kernel x86 cpuid utilities in KVM selftests

The kernel has a set of utilities and definitions to deal with x86 cpu
features.  The x86 KVM selftests don't use them, and instead have
evolved to use differing and ad-hoc methods for checking features. The
advantage of the kernel feature definitions is that they use a format
that embeds the info needed to extract them from cpuid (function, index,
and register to use).

Patches 1 and 2 add a script for checking that kernel headers don't
drift from their original copies. Patches 3 and 4 massage the related
cpuid header files in the kernel side, then copy them into tools/ so
they can be included by selftests.  The last 2 patches replace the tests
checking for cpu features to use the definitions and utilities
introduced from the kernel.

Tested the arch/x86 patches by building these combinations:
  ARCH=i386 allmodconfig
  ARCH=i386 allyesconfig
  ARCH=x86_64 allyesconfig
  ARCH=x86_64 allmodconfig
  ARCH=um alldefconfig
  ARCH=i386 alldefconfig
and the selftest changes on both x86 and arm64.

Thanks,
Ricardo

v2:
- Add script to check for kernel headers drift in tools
- Sync header that is currently failing the check
- Move header copies under tools/testing/selftests/kvm/include/x86
  instead of tools/arch/x86/include
v1: https://lore.kernel.org/kvm/20210422005626.564163-1-ricarkol@google.com

Ricardo Koller (6):
  KVM: selftests: Add kernel headers sync check
  tools headers x86: Update bitsperlong.h in tools
  x86/cpu: Expose CPUID regs, leaf and index definitions to tools
  tools headers x86: Copy cpuid helpers from the kernel
  KVM: selftests: Introduce utilities for checking x86 features
  KVM: selftests: Use kernel x86 cpuid features format

 arch/x86/events/intel/pt.c                    |   1 +
 arch/x86/include/asm/cpufeature.h             |  23 +-
 arch/x86/include/asm/processor.h              |  11 -
 arch/x86/kernel/cpu/scattered.c               |   2 +-
 arch/x86/kernel/cpuid.c                       |   2 +-
 tools/arch/x86/include/asm/cpufeatures.h      |   3 +
 tools/include/uapi/asm-generic/bitsperlong.h  |   1 +
 tools/testing/selftests/kvm/Makefile          |   2 +
 tools/testing/selftests/kvm/check-headers.sh  |  64 +++++
 .../kvm/include/x86_64/asm/cpufeature.h       | 257 ++++++++++++++++++
 .../selftests/kvm/include/x86_64/cpuid.h      |  61 +++++
 .../selftests/kvm/include/x86_64/processor.h  |  16 --
 .../kvm/include/x86_64/reverse_cpuid.h        | 185 +++++++++++++
 .../selftests/kvm/include/x86_64/svm_util.h   |  11 +-
 tools/testing/selftests/kvm/lib/x86_64/svm.c  |   6 +-
 tools/testing/selftests/kvm/lib/x86_64/vmx.c  |   5 +-
 tools/testing/selftests/kvm/steal_time.c      |   5 +-
 .../kvm/x86_64/cr4_cpuid_sync_test.c          |  23 +-
 .../selftests/kvm/x86_64/set_sregs_test.c     |  25 +-
 .../selftests/kvm/x86_64/vmx_pmu_msrs_test.c  |   8 +-
 .../kvm/x86_64/vmx_set_nested_state_test.c    |   5 +-
 .../selftests/kvm/x86_64/xss_msr_test.c       |  10 +-
 22 files changed, 630 insertions(+), 96 deletions(-)
 create mode 100755 tools/testing/selftests/kvm/check-headers.sh
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/asm/cpufeature.h
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/cpuid.h
 create mode 100644 tools/testing/selftests/kvm/include/x86_64/reverse_cpuid.h

-- 
2.31.1.498.g6c1eba8ee3d-goog