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KVM: x86/mmu: Speed up slot_rmap_walk_next for sparsely populated rmaps

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Avoid calling handlers on empty rmap entries and skip to the next non
empty rmap entry.

Empty rmap entries are noop in handlers.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Suggested-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220502220347.174664-1-vipinsh@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vipin Sharma 2022-05-02 22:03:47 +00:00 committed by Paolo Bonzini
parent 3c5c32457d
commit 6ba1e04fa6
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kvm/mmu/mmu.c
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@ -1483,9 +1483,11 @@ static bool slot_rmap_walk_okay(struct slot_rmap_walk_iterator *iterator)
static void slot_rmap_walk_next(struct slot_rmap_walk_iterator *iterator)
{
if (++iterator->rmap <= iterator->end_rmap) {
while (++iterator->rmap <= iterator->end_rmap) {
iterator->gfn += (1UL << KVM_HPAGE_GFN_SHIFT(iterator->level));
return;
if (iterator->rmap->val)
return;
}
if (++iterator->level > iterator->end_level) {