linux-kernel - [PATCH 09/10 RFC] KVM: x86: MMU: Move parent_pte handling from kvm_mmu_get_page() to link_shadow

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Date:	Thu, 12 Nov 2015 20:56:56 +0900
From:	Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>
To:	pbonzini@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 09/10 RFC] KVM: x86: MMU: Move parent_pte handling from
 kvm_mmu_get_page() to link_shadow_page()

Every time kvm_mmu_get_page() is called with a non-NULL parent_pte
argument, link_shadow_page() follows that to set the parent entry so
that the new mapping will point to the returned page table.

Moving parent_pte handling there allows to clean up the code because
parent_pte is passed to kvm_mmu_get_page() just for mark_unsync() and
mmu_page_add_parent_pte().

Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>
---
 arch/x86/kvm/mmu.c         | 21 ++++++++-------------
 arch/x86/kvm/paging_tmpl.h |  6 ++----
 2 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 9273cd4..33fe720 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2108,14 +2108,9 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 		if (sp->unsync_children) {
 			kvm_make_request(KVM_REQ_MMU_SYNC, vcpu);
 			kvm_mmu_mark_parents_unsync(sp);
-			if (parent_pte)
-				mark_unsync(parent_pte);
 		} else if (sp->unsync) {
 			kvm_mmu_mark_parents_unsync(sp);
-			if (parent_pte)
-				mark_unsync(parent_pte);
 		}
-		mmu_page_add_parent_pte(vcpu, sp, parent_pte);
 
 		__clear_sp_write_flooding_count(sp);
 		trace_kvm_mmu_get_page(sp, false);
@@ -2127,7 +2122,6 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 	sp = kvm_mmu_alloc_page(vcpu, direct);
 
 	sp->parent_ptes.val = 0;
-	mmu_page_add_parent_pte(vcpu, sp, parent_pte);
 
 	sp->gfn = gfn;
 	sp->role = role;
@@ -2196,7 +2190,8 @@ static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator)
 	return __shadow_walk_next(iterator, *iterator->sptep);
 }
 
-static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed)
+static void link_shadow_page(struct kvm_vcpu *vcpu, u64 *sptep,
+			     struct kvm_mmu_page *sp, bool accessed)
 {
 	u64 spte;
 
@@ -2210,6 +2205,11 @@ static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp, bool accessed)
 		spte |= shadow_accessed_mask;
 
 	mmu_spte_set(sptep, spte);
+
+	if (sp->unsync_children || sp->unsync)
+		mark_unsync(sptep);
+
+	mmu_page_add_parent_pte(vcpu, sp, sptep);
 }
 
 static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
@@ -2268,11 +2268,6 @@ static void kvm_mmu_page_unlink_children(struct kvm *kvm,
 		mmu_page_zap_pte(kvm, sp, sp->spt + i);
 }
 
-static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte)
-{
-	mmu_page_remove_parent_pte(sp, parent_pte);
-}
-
 static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp)
 {
 	u64 *sptep;
@@ -2738,7 +2733,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, int write, int map_writable,
 					      iterator.level - 1,
 					      1, ACC_ALL, iterator.sptep);
 
-			link_shadow_page(iterator.sptep, sp, true);
+			link_shadow_page(vcpu, iterator.sptep, sp, true);
 		}
 	}
 	return emulate;
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 9d21b44..f414ca6 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -598,7 +598,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 			goto out_gpte_changed;
 
 		if (sp)
-			link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK);
+			link_shadow_page(vcpu, it.sptep, sp, PT_GUEST_ACCESSED_MASK);
 	}
 
 	for (;
@@ -618,7 +618,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 
 		sp = kvm_mmu_get_page(vcpu, direct_gfn, addr, it.level-1,
 				      true, direct_access, it.sptep);
-		link_shadow_page(it.sptep, sp, PT_GUEST_ACCESSED_MASK);
+		link_shadow_page(vcpu, it.sptep, sp, PT_GUEST_ACCESSED_MASK);
 	}
 
 	clear_sp_write_flooding_count(it.sptep);
@@ -629,8 +629,6 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 	return emulate;
 
 out_gpte_changed:
-	if (sp)
-		kvm_mmu_put_page(sp, it.sptep);
 	kvm_release_pfn_clean(pfn);
 	return 0;
 }
-- 
2.1.0

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