1 files changed, 24 insertions, 20 deletions

diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 360983865398..d64ccb417c60 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -20,6 +20,16 @@ extern bool dbg;
 #define MMU_WARN_ON(x) do { } while (0)
 #endif
 
+/*
+ * Unlike regular MMU roots, PAE "roots", a.k.a. PDPTEs/PDPTRs, have a PRESENT
+ * bit, and thus are guaranteed to be non-zero when valid.  And, when a guest
+ * PDPTR is !PRESENT, its corresponding PAE root cannot be set to INVALID_PAGE,
+ * as the CPU would treat that as PRESENT PDPTR with reserved bits set.  Use
+ * '0' instead of INVALID_PAGE to indicate an invalid PAE root.
+ */
+#define INVALID_PAE_ROOT	0
+#define IS_VALID_PAE_ROOT(x)	(!!(x))
+
 struct kvm_mmu_page {
 	struct list_head link;
 	struct hlist_node hash_link;
@@ -40,7 +50,11 @@ struct kvm_mmu_page {
 	u64 *spt;
 	/* hold the gfn of each spte inside spt */
 	gfn_t *gfns;
-	int root_count;          /* Currently serving as active root */
+	/* Currently serving as active root */
+	union {
+		int root_count;
+		refcount_t tdp_mmu_root_count;
+	};
 	unsigned int unsync_children;
 	struct kvm_rmap_head parent_ptes; /* rmap pointers to parent sptes */
 	DECLARE_BITMAP(unsync_child_bitmap, 512);
@@ -78,9 +92,14 @@ static inline struct kvm_mmu_page *sptep_to_sp(u64 *sptep)
 	return to_shadow_page(__pa(sptep));
 }
 
+static inline int kvm_mmu_role_as_id(union kvm_mmu_page_role role)
+{
+	return role.smm ? 1 : 0;
+}
+
 static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
 {
-	return sp->role.smm ? 1 : 0;
+	return kvm_mmu_role_as_id(sp->role);
 }
 
 static inline bool kvm_vcpu_ad_need_write_protect(struct kvm_vcpu *vcpu)
@@ -108,22 +127,6 @@ bool kvm_mmu_slot_gfn_write_protect(struct kvm *kvm,
 void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
 					u64 start_gfn, u64 pages);
 
-static inline void kvm_mmu_get_root(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	BUG_ON(!sp->root_count);
-	lockdep_assert_held(&kvm->mmu_lock);
-
-	++sp->root_count;
-}
-
-static inline bool kvm_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
-	lockdep_assert_held(&kvm->mmu_lock);
-	--sp->root_count;
-
-	return !sp->root_count;
-}
-
 /*
  * Return values of handle_mmio_page_fault, mmu.page_fault, and fast_page_fault().
  *
@@ -146,8 +149,9 @@ enum {
 #define SET_SPTE_NEED_REMOTE_TLB_FLUSH	BIT(1)
 #define SET_SPTE_SPURIOUS		BIT(2)
 
-int kvm_mmu_max_mapping_level(struct kvm *kvm, struct kvm_memory_slot *slot,
-			      gfn_t gfn, kvm_pfn_t pfn, int max_level);
+int kvm_mmu_max_mapping_level(struct kvm *kvm,
+			      const struct kvm_memory_slot *slot, gfn_t gfn,
+			      kvm_pfn_t pfn, int max_level);
 int kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
 			    int max_level, kvm_pfn_t *pfnp,
 			    bool huge_page_disallowed, int *req_level);