KVM: nVMX: Track vmcs12 offsets for shadowed VMCS fields

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The vmcs12 fields offsets are constant and known at compile time.  Store
the associated offset for each shadowed field to avoid the costly lookup
in vmcs_field_to_offset() when copying between vmcs12 and the shadow
VMCS.  Avoiding the costly lookup reduces the latency of copying by
~100 cycles in each direction.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2019-05-07 08:36:25 -07:00 • committed by Paolo Bonzini

parent b643780562

commit 1c6f0b47fb

3 changed files with 108 additions and 119 deletions

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96

arch/x86/kvm/vmx/nested.c

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57

arch/x86/kvm/vmx/vmcs12.h

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74

arch/x86/kvm/vmx/vmcs_shadow_fields.h

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