KVM: x86/mmu: Add optimized helper to retrieve an SPTE's index

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Add spte_index() to dedup all the code that calculates a SPTE's index
into its parent's page table and/or spt array.  Opportunistically tweak
the calculation to avoid pointer arithmetic, which is subtle (subtract in
8-byte chunks) and less performant (requires the compiler to generate the
subtraction).

Suggested-by: David Matlack <dmatlack@google.com>
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220712020724.1262121-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2022-07-12 02:07:22 +00:00 • committed by Paolo Bonzini

parent b184b35d06

commit 79e48cec6c

3 changed files with 18 additions and 14 deletions

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22

arch/x86/kvm/mmu/mmu.c

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4

arch/x86/kvm/mmu/paging_tmpl.h

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6

arch/x86/kvm/mmu/spte.h

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