KVM: selftests: Add framework to query KVM CPUID bits

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Add X86_FEATURE_* magic in the style of KVM-Unit-Tests' implementation,
where the CPUID function, index, output register, and output bit position
are embedded in the macro value.  Add kvm_cpu_has() to query KVM's
supported CPUID and use it set_sregs_test, which is the most prolific
user of manual feature querying.

Opportunstically rename calc_cr4_feature_bits() to
calc_supported_cr4_feature_bits() to better capture how the CR4 bits are
chosen.

Link: https://lore.kernel.org/all/20210422005626.564163-1-ricarkol@google.com
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Suggested-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-4-seanjc@google.com

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This commit is contained in:

Sean Christopherson 2022-06-14 20:06:28 +00:00

parent 683edfd42b

commit 61d76b8a69

3 changed files with 128 additions and 28 deletions

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106

tools/testing/selftests/kvm/include/x86_64/processor.h

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22

tools/testing/selftests/kvm/lib/x86_64/processor.c

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28

tools/testing/selftests/kvm/x86_64/set_sregs_test.c

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