KVM: x86: Add requested index to the CPUID tracepoint

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Output the requested index when tracing CPUID emulation; it's basically
mandatory for leafs where the index is meaningful, and is helpful for
verifying KVM correctness even when the index isn't meaningful, e.g. the
trace for a Linux guest's hypervisor_cpuid_base() probing appears to
be broken (returns all zeroes) at first glance, but is correct because
the index is non-zero, i.e. the output values correspond to a random
index in the maximum basic leaf.

Suggested-by: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2020-03-17 12:53:53 -07:00 • committed by Paolo Bonzini

parent d55c9d4009

commit e7adda2810

2 changed files with 9 additions and 6 deletions

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2

arch/x86/kvm/cpuid.c

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13

arch/x86/kvm/trace.h

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