From: Ricardo Koller <ricarkol@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com
Subject: Re: [PATCH 0/5] KVM: x86: Use kernel x86 cpuid utilities in KVM selftests
Date: Wed, 28 Apr 2021 12:46:17 -0700 [thread overview]
Message-ID: <YIm7iWxggvoN9riz@google.com> (raw)
In-Reply-To: <c4524e4a-55c7-66f9-25d6-d397f11d25a8@redhat.com>
On Thu, Apr 22, 2021 at 09:02:09AM +0200, Paolo Bonzini wrote:
> On 22/04/21 02:56, Ricardo Koller wrote:
> > 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).
> >
> > The first 3 patches 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.
>
> I queued the first, but I am not sure about the rest.
>
> An alternative is to copy over the code from kvm-unit-tests which encodes
> the leaf/subleaf/register/bit values into the X86_FEATURE_* value. Sharing
> code with kvm-unit-tests is probably simpler than adding #ifdef __KERNEL__
> and keeping the headers in sync.
>
> Paolo
>
Thanks. I was thinking about kvm-unit-tests, but the issue is that it
would also be a copy. And just like with kernel headers, it would be
ideal to keep them in-sync. The advantage of the kernel headers is that
it's much easier to check and fix diffs with them. On the other hand, as
you say, there would not be any #ifdef stuff with kvm=unit-tests. Please
let me know what you think.
Thanks,
Ricardo
> > Thanks,
> > Ricardo
> >
> > Ricardo Koller (5):
> > KVM: x86: Move reverse CPUID helpers to separate header file
> > 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 +-
> > arch/x86/kvm/cpuid.h | 177 +-----------
> > arch/x86/kvm/reverse_cpuid.h | 185 +++++++++++++
> > tools/arch/x86/include/asm/cpufeature.h | 257 ++++++++++++++++++
> > tools/arch/x86/include/asm/cpufeatures.h | 3 +
> > .../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 +-
> > 21 files changed, 749 insertions(+), 272 deletions(-)
> > create mode 100644 arch/x86/kvm/reverse_cpuid.h
> > create mode 100644 tools/arch/x86/include/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
> >
>
next prev parent reply other threads:[~2021-04-28 19:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 0:56 [PATCH 0/5] KVM: x86: Use kernel x86 cpuid utilities in KVM selftests Ricardo Koller
2021-04-22 0:56 ` [PATCH 1/5] KVM: x86: Move reverse CPUID helpers to separate header file Ricardo Koller
2021-04-22 0:56 ` [PATCH 2/5] x86/cpu: Expose CPUID regs, leaf and index definitions to tools Ricardo Koller
2021-04-22 0:56 ` [PATCH 3/5] tools headers x86: Copy cpuid helpers from the kernel Ricardo Koller
2021-04-22 6:59 ` Paolo Bonzini
2021-04-23 0:08 ` Ricardo Koller
2021-04-22 0:56 ` [PATCH 4/5] KVM: selftests: Introduce utilities for checking x86 features Ricardo Koller
2021-04-22 0:56 ` [PATCH 5/5] KVM: selftests: Use kernel x86 cpuid features format Ricardo Koller
2021-04-22 7:02 ` [PATCH 0/5] KVM: x86: Use kernel x86 cpuid utilities in KVM selftests Paolo Bonzini
2021-04-28 19:46 ` Ricardo Koller [this message]
2021-06-29 17:28 ` Jim Mattson
2021-07-08 16:50 ` Paolo Bonzini
2021-07-08 17:21 ` Ricardo Koller
2021-07-08 17:57 ` Paolo Bonzini
2021-07-08 19:46 ` Ricardo Koller
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