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authorSean Christopherson <seanjc@google.com>2020-12-18 03:31:39 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2021-01-08 02:00:27 +0300
commit9aa418792f5f11ef5d6f72265e1f8ae07efd5784 (patch)
treef4910d7c94b78d005d90f51aaac3d772950a5866 /lib/Makefile
parentdde81f9477d018a96fba991c5928c6ab8cc109f8 (diff)
downloadlinux-9aa418792f5f11ef5d6f72265e1f8ae07efd5784.tar.xz
KVM: x86/mmu: Optimize not-present/MMIO SPTE check in get_mmio_spte()
Check only the terminal leaf for a "!PRESENT || MMIO" SPTE when looking for reserved bits on valid, non-MMIO SPTEs. The get_walk() helpers terminate their walks if a not-present or MMIO SPTE is encountered, i.e. the non-terminal SPTEs have already been verified to be regular SPTEs. This eliminates an extra check-and-branch in a relatively hot loop. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20201218003139.2167891-5-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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