KVM: x86/mmu: Consolidate shadow page allocation and initialization

Consolidate kvm_mmu_alloc_page() and kvm_mmu_alloc_shadow_page() under
the latter so that all shadow page allocation and initialization happens
in one place.

No functional change intended.
Signed-off-by: David Matlack <dmatlack@google.com>
Message-Id: <20220516232138.1783324-8-dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -1664,27 +1664,6 @@ static void drop_parent_pte(struct kvm_mmu_page *sp,
 	mmu_spte_clear_no_track(parent_pte);
 }
 
-static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, bool direct)
-{
-	struct kvm_mmu_page *sp;
-
-	sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache);
-	sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache);
-	if (!direct)
-		sp->gfns = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache);
-	set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
-
-	/*
-	 * active_mmu_pages must be a FIFO list, as kvm_zap_obsolete_pages()
-	 * depends on valid pages being added to the head of the list.  See
-	 * comments in kvm_zap_obsolete_pages().
-	 */
-	sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
-	list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
-	kvm_mod_used_mmu_pages(vcpu->kvm, +1);
-	return sp;
-}
-
 static void mark_unsync(u64 *spte);
 static void kvm_mmu_mark_parents_unsync(struct kvm_mmu_page *sp)
 {
@@ -2072,7 +2051,23 @@ static struct kvm_mmu_page *kvm_mmu_alloc_shadow_page(struct kvm_vcpu *vcpu,
 						      struct hlist_head *sp_list,
 						      union kvm_mmu_page_role role)
 {
-	struct kvm_mmu_page *sp = kvm_mmu_alloc_page(vcpu, role.direct);
+	struct kvm_mmu_page *sp;
+
+	sp = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache);
+	sp->spt = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache);
+	if (!role.direct)
+		sp->gfns = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache);
+
+	set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
+
+	/*
+	 * active_mmu_pages must be a FIFO list, as kvm_zap_obsolete_pages()
+	 * depends on valid pages being added to the head of the list.  See
+	 * comments in kvm_zap_obsolete_pages().
+	 */
+	sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
+	list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
+	kvm_mod_used_mmu_pages(vcpu->kvm, +1);
 
 	sp->gfn = gfn;
 	sp->role = role;