KVM: x86/mmu: Use low available bits for removed SPTEs

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Use low "available" bits to tag REMOVED SPTEs.  Using a high bit is
moderately costly as it often causes the compiler to generate a 64-bit
immediate.  More importantly, this makes it very clear REMOVED_SPTE is
a value, not a flag.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210225204749.1512652-24-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-02-25 12:47:48 -08:00 • committed by Paolo Bonzini

parent 7a51393ae0

commit 715f1079ee

2 changed files with 17 additions and 5 deletions

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11

arch/x86/kvm/mmu/spte.c

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11

arch/x86/kvm/mmu/spte.h

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