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Groups > linux.kernel > #1341714

[PATCH 09/11] KVM: MMU: use page track for non-leaf shadow pages

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non-leaf shadow pages are always write protected, it can be the user
of page track

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
 arch/x86/kvm/mmu.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 58c067d..74684b2 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -806,11 +806,17 @@ static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
 	struct kvm_memory_slot *slot;
 	gfn_t gfn;
 
+	kvm->arch.indirect_shadow_pages++;
 	gfn = sp->gfn;
 	slots = kvm_memslots_for_spte_role(kvm, sp->role);
 	slot = __gfn_to_memslot(slots, gfn);
+
+	/* the non-leaf shadow pages are keeping readonly. */
+	if (sp->role.level > PT_PAGE_TABLE_LEVEL)
+		return kvm_slot_page_track_add_page(kvm, slot, gfn,
+						    KVM_PAGE_TRACK_WRITE);
+
 	kvm_mmu_gfn_disallow_lpage(slot, gfn);
-	kvm->arch.indirect_shadow_pages++;
 }
 
 static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
@@ -819,11 +825,15 @@ static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp)
 	struct kvm_memory_slot *slot;
 	gfn_t gfn;
 
+	kvm->arch.indirect_shadow_pages--;
 	gfn = sp->gfn;
 	slots = kvm_memslots_for_spte_role(kvm, sp->role);
 	slot = __gfn_to_memslot(slots, gfn);
+	if (sp->role.level > PT_PAGE_TABLE_LEVEL)
+		return kvm_slot_page_track_remove_page(kvm, slot, gfn,
+						       KVM_PAGE_TRACK_WRITE);
+
 	kvm_mmu_gfn_allow_lpage(slot, gfn);
-	kvm->arch.indirect_shadow_pages--;
 }
 
 static bool __mmu_gfn_lpage_is_disallowed(gfn_t gfn, int level,
@@ -2132,12 +2142,18 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
 	hlist_add_head(&sp->hash_link,
 		&vcpu->kvm->arch.mmu_page_hash[kvm_page_table_hashfn(gfn)]);
 	if (!direct) {
-		if (rmap_write_protect(vcpu, gfn))
+		/*
+		 * we should do write protection before syncing pages
+		 * otherwise the content of the synced shadow page may
+		 * be inconsistent with guest page table.
+		 */
+		account_shadowed(vcpu->kvm, sp);
+
+		if (level == PT_PAGE_TABLE_LEVEL &&
+		      rmap_write_protect(vcpu, gfn))
 			kvm_flush_remote_tlbs(vcpu->kvm);
 		if (level > PT_PAGE_TABLE_LEVEL && need_sync)
 			kvm_sync_pages(vcpu, gfn);
-
-		account_shadowed(vcpu->kvm, sp);
 	}
 	sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
 	clear_page(sp->spt);
-- 
1.8.3.1

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[PATCH v4 00/11] KVM: x86: track guest page access Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:00 +0100
  [PATCH 11/11] KVM: MMU: apply page track notifier Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 05/11] KVM: page track: introduce kvm_slot_page_track_{add,remove}_page Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 09/11] KVM: MMU: use page track for non-leaf shadow pages Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
    Re: [PATCH 09/11] KVM: MMU: use page track for non-leaf shadow pages Paolo Bonzini <pbonzini@redhat.com> - 2016-02-29 16:30 +0100
  [PATCH 10/11] KVM: MMU: simplify mmu_need_write_protect Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 04/11] KVM: page track: add the framework of guest page tracking Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 06/11] KVM: MMU: let page fault handler be aware tracked page Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 08/11] KVM: page track: add notifier support Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 07/11] KVM: MMU: clear write-flooding on the fast path of tracked page Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 01/11] KVM: MMU: rename has_wrprotected_page to mmu_gfn_lpage_is_disallowed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 11:10 +0100
  [PATCH 02/11] KVM: MMU: introduce kvm_mmu_gfn_{allow,disallow}_lpage Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 12:30 +0100
  [PATCH 03/11] KVM: MMU: introduce kvm_mmu_slot_gfn_write_protect Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-02-24 12:30 +0100
  Re: [PATCH v4 00/11] KVM: x86: track guest page access Paolo Bonzini <pbonzini@redhat.com> - 2016-02-24 14:50 +0100

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