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(parent: 50c9e6f) | patch
KVM: MMU: simplify last_pte_bitmap
authorPaolo Bonzini <pbonzini@redhat.com>
Tue, 23 Feb 2016 11:51:19 +0000 (12:51 +0100)
committerPaolo Bonzini <pbonzini@redhat.com>
Tue, 8 Mar 2016 11:33:38 +0000 (12:33 +0100)
commit6bb69c9b69c315200ddc2bc79aee14c0184cf5b2
treec7023298fd90cabf3532b45afa31c03e71fdd604tree | snapshot (tar.gz zip)
parent50c9e6f3a69dfa458ecb671bcbd11e2eea6db0c1commit | diff
KVM: MMU: simplify last_pte_bitmap

Branch-free code is fun and everybody knows how much Avi loves it,
but last_pte_bitmap takes it a bit to the extreme.  Since the code
is simply doing a range check, like

(level == 1 ||
 ((gpte & PT_PAGE_SIZE_MASK) && level < N)

we can make it branch-free without storing the entire truth table;
it is enough to cache N.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/include/asm/kvm_host.h diff | blob | blame | history
arch/x86/kvm/mmu.c diff | blob | blame | history