Refactor the zap loop in kvm_recover_nx_lpages() to be a for loop that
iterates on to_zap and drop the !to_zap check that leads to the in-loop
calling of kvm_mmu_commit_zap_page(). The in-loop commit when to_zap
hits zero is superfluous now that there's an unconditional commit after
the loop to handle the case where lpage_disallowed_mmu_pages is emptied.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/kvm/mmu/mmu.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 48be51027af64..9cd3d2a23f8a5 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6321,7 +6321,10 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
ratio = READ_ONCE(nx_huge_pages_recovery_ratio);
to_zap = ratio ? DIV_ROUND_UP(kvm->stat.nx_lpage_splits, ratio) : 0;
- while (to_zap && !list_empty(&kvm->arch.lpage_disallowed_mmu_pages)) {
+ for ( ; to_zap; --to_zap) {
+ if (list_empty(&kvm->arch.lpage_disallowed_mmu_pages))
+ break;
+
/*
* We use a separate list instead of just using active_mmu_pages
* because the number of lpage_disallowed pages is expected to
@@ -6334,10 +6337,9 @@ static void kvm_recover_nx_lpages(struct kvm *kvm)
kvm_mmu_prepare_zap_page(kvm, sp, &invalid_list);
WARN_ON_ONCE(sp->lpage_disallowed);
- if (!--to_zap || need_resched() || spin_needbreak(&kvm->mmu_lock)) {
+ if (need_resched() || spin_needbreak(&kvm->mmu_lock)) {
kvm_mmu_commit_zap_page(kvm, &invalid_list);
- if (to_zap)
- cond_resched_lock(&kvm->mmu_lock);
+ cond_resched_lock(&kvm->mmu_lock);
}
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
--
2.26.0
