KVM: x86: virtualize cpuid faulting

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Hardware support for faulting on the cpuid instruction is not required to
emulate it, because cpuid triggers a VM exit anyways. KVM handles the relevant
MSRs (MSR_PLATFORM_INFO and MSR_MISC_FEATURES_ENABLE) and upon a
cpuid-induced VM exit checks the cpuid faulting state and the CPL.
kvm_require_cpl is even kind enough to inject the GP fault for us.

Signed-off-by: Kyle Huey <khuey@kylehuey.com>
Reviewed-by: David Matlack <dmatlack@google.com>
[Return "1" from kvm_emulate_cpuid, it's not void. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Kyle Huey 2017-03-20 01:16:28 -07:00 • committed by Paolo Bonzini

parent bd17117bb2

commit db2336a804

5 changed files with 49 additions and 0 deletions

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2

arch/x86/include/asm/kvm_host.h

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3

arch/x86/kvm/cpuid.c

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11

arch/x86/kvm/cpuid.h

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7

arch/x86/kvm/emulate.c

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26

arch/x86/kvm/x86.c

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