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Commit 50c9e6f3 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: MMU: coalesce more page zapping in mmu_sync_children 



mmu_sync_children can only process up to 16 pages at a time.  Check
if we need to reschedule, and do not bother zapping the pages until
that happens.

Reviewed-by: default avatarTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 2a74003a

arch/x86/kvm/mmu.c

+11 −4
Original line number Diff line number Diff line
@@ -2059,24 +2059,31 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu, 
	struct mmu_page_path parents;

	struct kvm_mmu_pages pages;

	LIST_HEAD(invalid_list);

	bool flush = false;



	while (mmu_unsync_walk(parent, &pages)) {

		bool protected = false;

		bool flush = false;



		for_each_sp(pages, sp, parents, i)

			protected |= rmap_write_protect(vcpu, sp->gfn);



		if (protected)

		if (protected) {

			kvm_flush_remote_tlbs(vcpu->kvm);

			flush = false;

		}



		for_each_sp(pages, sp, parents, i) {

			flush |= kvm_sync_page(vcpu, sp, &invalid_list);

			mmu_pages_clear_parents(&parents);

		}

		if (need_resched() || spin_needbreak(&vcpu->kvm->mmu_lock)) {

			kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);

			cond_resched_lock(&vcpu->kvm->mmu_lock);

			flush = false;

		}

	}



	kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);

}



static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)