KVM: MMU: Rename PT64_ROOT_LEVEL to PT64_ROOT_4LEVEL.

Now we have 4 level page table and 5 level page table in 64 bits
long mode, let's rename the PT64_ROOT_LEVEL to PT64_ROOT_4LEVEL,
then we can use PT64_ROOT_5LEVEL for 5 level page table, it's
helpful to make the code more clear.

Also PT64_ROOT_MAX_LEVEL is defined as 4, so that we can just
redefine it to 5 whenever a replacement is needed for 5 level
paging.
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -315,8 +315,10 @@ struct kvm_pio_request {
 	int size;
 };
 
+#define PT64_ROOT_MAX_LEVEL 4
+
 struct rsvd_bits_validate {
-	u64 rsvd_bits_mask[2][4];
+	u64 rsvd_bits_mask[2][PT64_ROOT_MAX_LEVEL];
 	u64 bad_mt_xwr;
 };
 

arch/x86/kvm/mmu.c

@@ -2167,8 +2167,8 @@ static bool kvm_sync_pages(struct kvm_vcpu *vcpu, gfn_t gfn,
 }
 
 struct mmu_page_path {
-	struct kvm_mmu_page *parent[PT64_ROOT_LEVEL];
-	unsigned int idx[PT64_ROOT_LEVEL];
+	struct kvm_mmu_page *parent[PT64_ROOT_MAX_LEVEL];
+	unsigned int idx[PT64_ROOT_MAX_LEVEL];
 };
 
 #define for_each_sp(pvec, sp, parents, i)			\
@@ -2383,8 +2383,8 @@ static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator,
 	iterator->shadow_addr = vcpu->arch.mmu.root_hpa;
 	iterator->level = vcpu->arch.mmu.shadow_root_level;
 
-	if (iterator->level == PT64_ROOT_LEVEL &&
-	    vcpu->arch.mmu.root_level < PT64_ROOT_LEVEL &&
+	if (iterator->level == PT64_ROOT_4LEVEL &&
+	    vcpu->arch.mmu.root_level < PT64_ROOT_4LEVEL &&
 	    !vcpu->arch.mmu.direct_map)
 		--iterator->level;
 
@@ -3322,8 +3322,8 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu)
 	if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
 		return;
 
-	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL &&
-	    (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL ||
+	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_4LEVEL &&
+	    (vcpu->arch.mmu.root_level == PT64_ROOT_4LEVEL ||
 	     vcpu->arch.mmu.direct_map)) {
 		hpa_t root = vcpu->arch.mmu.root_hpa;
 
@@ -3375,13 +3375,13 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
 	struct kvm_mmu_page *sp;
 	unsigned i;
 
-	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_4LEVEL) {
 		spin_lock(&vcpu->kvm->mmu_lock);
 		if(make_mmu_pages_available(vcpu) < 0) {
 			spin_unlock(&vcpu->kvm->mmu_lock);
 			return 1;
 		}
-		sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_LEVEL, 1, ACC_ALL);
+		sp = kvm_mmu_get_page(vcpu, 0, 0, PT64_ROOT_4LEVEL, 1, ACC_ALL);
 		++sp->root_count;
 		spin_unlock(&vcpu->kvm->mmu_lock);
 		vcpu->arch.mmu.root_hpa = __pa(sp->spt);
@@ -3425,7 +3425,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 	 * Do we shadow a long mode page table? If so we need to
 	 * write-protect the guests page table root.
 	 */
-	if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
+	if (vcpu->arch.mmu.root_level == PT64_ROOT_4LEVEL) {
 		hpa_t root = vcpu->arch.mmu.root_hpa;
 
 		MMU_WARN_ON(VALID_PAGE(root));
@@ -3435,7 +3435,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 			spin_unlock(&vcpu->kvm->mmu_lock);
 			return 1;
 		}
-		sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL,
+		sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_4LEVEL,
 				      0, ACC_ALL);
 		root = __pa(sp->spt);
 		++sp->root_count;
@@ -3450,7 +3450,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 	 * the shadow page table may be a PAE or a long mode page table.
 	 */
 	pm_mask = PT_PRESENT_MASK;
-	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL)
+	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_4LEVEL)
 		pm_mask |= PT_ACCESSED_MASK | PT_WRITABLE_MASK | PT_USER_MASK;
 
 	for (i = 0; i < 4; ++i) {
@@ -3486,7 +3486,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 	 * If we shadow a 32 bit page table with a long mode page
 	 * table we enter this path.
 	 */
-	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+	if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_4LEVEL) {
 		if (vcpu->arch.mmu.lm_root == NULL) {
 			/*
 			 * The additional page necessary for this is only
@@ -3531,7 +3531,7 @@ static void mmu_sync_roots(struct kvm_vcpu *vcpu)
 
 	vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY);
 	kvm_mmu_audit(vcpu, AUDIT_PRE_SYNC);
-	if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
+	if (vcpu->arch.mmu.root_level == PT64_ROOT_4LEVEL) {
 		hpa_t root = vcpu->arch.mmu.root_hpa;
 		sp = page_header(root);
 		mmu_sync_children(vcpu, sp);
@@ -3614,7 +3614,7 @@ static bool
 walk_shadow_page_get_mmio_spte(struct kvm_vcpu *vcpu, u64 addr, u64 *sptep)
 {
 	struct kvm_shadow_walk_iterator iterator;
-	u64 sptes[PT64_ROOT_LEVEL], spte = 0ull;
+	u64 sptes[PT64_ROOT_MAX_LEVEL], spte = 0ull;
 	int root, leaf;
 	bool reserved = false;
 
@@ -4057,7 +4057,7 @@ __reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
 		rsvd_check->rsvd_bits_mask[1][0] =
 			rsvd_check->rsvd_bits_mask[0][0];
 		break;
-	case PT64_ROOT_LEVEL:
+	case PT64_ROOT_4LEVEL:
 		rsvd_check->rsvd_bits_mask[0][3] = exb_bit_rsvd |
 			nonleaf_bit8_rsvd | rsvd_bits(7, 7) |
 			rsvd_bits(maxphyaddr, 51);
@@ -4367,7 +4367,7 @@ static void paging64_init_context_common(struct kvm_vcpu *vcpu,
 static void paging64_init_context(struct kvm_vcpu *vcpu,
 				  struct kvm_mmu *context)
 {
-	paging64_init_context_common(vcpu, context, PT64_ROOT_LEVEL);
+	paging64_init_context_common(vcpu, context, PT64_ROOT_4LEVEL);
 }
 
 static void paging32_init_context(struct kvm_vcpu *vcpu,
@@ -4422,7 +4422,7 @@ static void init_kvm_tdp_mmu(struct kvm_vcpu *vcpu)
 		context->root_level = 0;
 	} else if (is_long_mode(vcpu)) {
 		context->nx = is_nx(vcpu);
-		context->root_level = PT64_ROOT_LEVEL;
+		context->root_level = PT64_ROOT_4LEVEL;
 		reset_rsvds_bits_mask(vcpu, context);
 		context->gva_to_gpa = paging64_gva_to_gpa;
 	} else if (is_pae(vcpu)) {
@@ -4533,7 +4533,7 @@ static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu)
 		g_context->gva_to_gpa = nonpaging_gva_to_gpa_nested;
 	} else if (is_long_mode(vcpu)) {
 		g_context->nx = is_nx(vcpu);
-		g_context->root_level = PT64_ROOT_LEVEL;
+		g_context->root_level = PT64_ROOT_4LEVEL;
 		reset_rsvds_bits_mask(vcpu, g_context);
 		g_context->gva_to_gpa = paging64_gva_to_gpa_nested;
 	} else if (is_pae(vcpu)) {

arch/x86/kvm/mmu.h

@@ -37,7 +37,7 @@
 #define PT32_DIR_PSE36_MASK \
 	(((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
 
-#define PT64_ROOT_LEVEL 4
+#define PT64_ROOT_4LEVEL 4
 #define PT32_ROOT_LEVEL 2
 #define PT32E_ROOT_LEVEL 3
 

arch/x86/kvm/mmu_audit.c

@@ -62,11 +62,11 @@ static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
 	if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
 		return;
 
-	if (vcpu->arch.mmu.root_level == PT64_ROOT_LEVEL) {
+	if (vcpu->arch.mmu.root_level == PT64_ROOT_4LEVEL) {
 		hpa_t root = vcpu->arch.mmu.root_hpa;
 
 		sp = page_header(root);
-		__mmu_spte_walk(vcpu, sp, fn, PT64_ROOT_LEVEL);
+		__mmu_spte_walk(vcpu, sp, fn, PT64_ROOT_4LEVEL);
 		return;
 	}
 

arch/x86/kvm/svm.c

@@ -584,7 +584,7 @@ static inline void invlpga(unsigned long addr, u32 asid)
 static int get_npt_level(void)
 {
 #ifdef CONFIG_X86_64
-	return PT64_ROOT_LEVEL;
+	return PT64_ROOT_4LEVEL;
 #else
 	return PT32E_ROOT_LEVEL;
 #endif