KVM: x86/mmu: Prepend "kvm_" to memory cache helpers that will be global

Rename the memory helpers that will soon be moved to common code and be
made globaly available via linux/kvm_host.h.  "mmu" alone is not a
sufficient namespace for globally available KVM symbols.

Opportunistically add "nr_" in mmu_memory_cache_free_objects() to make
it clear the function returns the number of free objects, as opposed to
freeing existing objects.
Suggested-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200703023545.8771-14-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -1072,7 +1072,7 @@ static inline void *mmu_memory_cache_alloc_obj(struct kvm_mmu_memory_cache *mc,
 		return (void *)__get_free_page(gfp_flags);
 }
 
-static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min)
+static int kvm_mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min)
 {
 	void *obj;
 
@@ -1087,12 +1087,12 @@ static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *mc, int min)
 	return 0;
 }
 
-static int mmu_memory_cache_free_objects(struct kvm_mmu_memory_cache *mc)
+static int kvm_mmu_memory_cache_nr_free_objects(struct kvm_mmu_memory_cache *mc)
 {
 	return mc->nobjs;
 }
 
-static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
+static void kvm_mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
 {
 	while (mc->nobjs) {
 		if (mc->kmem_cache)
@@ -1107,33 +1107,33 @@ static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu, bool maybe_indirect)
 	int r;
 
 	/* 1 rmap, 1 parent PTE per level, and the prefetched rmaps. */
-	r = mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache,
+	r = kvm_mmu_topup_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache,
 				       1 + PT64_ROOT_MAX_LEVEL + PTE_PREFETCH_NUM);
 	if (r)
 		return r;
-	r = mmu_topup_memory_cache(&vcpu->arch.mmu_shadow_page_cache,
+	r = kvm_mmu_topup_memory_cache(&vcpu->arch.mmu_shadow_page_cache,
 				       PT64_ROOT_MAX_LEVEL);
 	if (r)
 		return r;
 	if (maybe_indirect) {
-		r = mmu_topup_memory_cache(&vcpu->arch.mmu_gfn_array_cache,
+		r = kvm_mmu_topup_memory_cache(&vcpu->arch.mmu_gfn_array_cache,
 					       PT64_ROOT_MAX_LEVEL);
 		if (r)
 			return r;
 	}
-	return mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache,
+	return kvm_mmu_topup_memory_cache(&vcpu->arch.mmu_page_header_cache,
 					  PT64_ROOT_MAX_LEVEL);
 }
 
 static void mmu_free_memory_caches(struct kvm_vcpu *vcpu)
 {
-	mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache);
-	mmu_free_memory_cache(&vcpu->arch.mmu_shadow_page_cache);
-	mmu_free_memory_cache(&vcpu->arch.mmu_gfn_array_cache);
-	mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache);
+	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_pte_list_desc_cache);
+	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_shadow_page_cache);
+	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_gfn_array_cache);
+	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_header_cache);
 }
 
-static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
+static void *kvm_mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
 {
 	void *p;
 
@@ -1147,7 +1147,7 @@ static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc)
 
 static struct pte_list_desc *mmu_alloc_pte_list_desc(struct kvm_vcpu *vcpu)
 {
-	return mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache);
+	return kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_pte_list_desc_cache);
 }
 
 static void mmu_free_pte_list_desc(struct pte_list_desc *pte_list_desc)
@@ -1418,7 +1418,7 @@ static bool rmap_can_add(struct kvm_vcpu *vcpu)
 	struct kvm_mmu_memory_cache *mc;
 
 	mc = &vcpu->arch.mmu_pte_list_desc_cache;
-	return mmu_memory_cache_free_objects(mc);
+	return kvm_mmu_memory_cache_nr_free_objects(mc);
 }
 
 static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
@@ -2090,10 +2090,10 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu, int direct
 {
 	struct kvm_mmu_page *sp;
 
-	sp = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_header_cache);
-	sp->spt = mmu_memory_cache_alloc(&vcpu->arch.mmu_shadow_page_cache);
+	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 = mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache);
+		sp->gfns = kvm_mmu_memory_cache_alloc(&vcpu->arch.mmu_gfn_array_cache);
 	set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
 
 	/*