linux-kernel - [PATCH 09/12] KVM: MMU: coalesce zapping page after mmu_sync

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Date:	Wed, 24 Feb 2016 14:17:50 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:	yoshikawa_takuya_b1@....ntt.co.jp, guangrong.xiao@...ux.intel.com,
	mtosatti@...hat.com
Subject: [PATCH 09/12] KVM: MMU: coalesce zapping page after mmu_sync_children

Move the call to kvm_mmu_flush_or_zap outside the loop.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/mmu.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 725316df32ec..6d47b5c43246 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2029,24 +2029,27 @@ 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);
 		}
-		kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
 		cond_resched_lock(&vcpu->kvm->mmu_lock);
 	}
+
+	kvm_mmu_flush_or_zap(vcpu, &invalid_list, false, flush);
 }
 
 static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)
-- 
1.8.3.1