KVM: x86: use struct kvm_mmu_root_info for mmu->root

The root_hpa and root_pgd fields form essentially a struct kvm_mmu_root_info.
Use the struct to have more consistency between mmu->root and
mmu->prev_roots.

The patch is entirely search and replace except for cached_root_available,
which does not need a temporary struct kvm_mmu_root_info anymore.
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/include/asm/kvm_host.h

@@ -432,8 +432,7 @@ struct kvm_mmu {
 	int (*sync_page)(struct kvm_vcpu *vcpu,
 			 struct kvm_mmu_page *sp);
 	void (*invlpg)(struct kvm_vcpu *vcpu, gva_t gva, hpa_t root_hpa);
-	hpa_t root_hpa;
-	gpa_t root_pgd;
+	struct kvm_mmu_root_info root;
 	union kvm_mmu_role mmu_role;
 	u8 root_level;
 	u8 shadow_root_level;

arch/x86/kvm/mmu.h

@@ -85,7 +85,7 @@ void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu);
 
 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 {
-	if (likely(vcpu->arch.mmu->root_hpa != INVALID_PAGE))
+	if (likely(vcpu->arch.mmu->root.hpa != INVALID_PAGE))
 		return 0;
 
 	return kvm_mmu_load(vcpu);
@@ -107,7 +107,7 @@ static inline unsigned long kvm_get_active_pcid(struct kvm_vcpu *vcpu)
 
 static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
 {
-	u64 root_hpa = vcpu->arch.mmu->root_hpa;
+	u64 root_hpa = vcpu->arch.mmu->root.hpa;
 
 	if (!VALID_PAGE(root_hpa))
 		return;

arch/x86/kvm/mmu/mmu.c

@@ -2146,7 +2146,7 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
 		 * prev_root is currently only used for 64-bit hosts. So only
 		 * the active root_hpa is valid here.
 		 */
-		BUG_ON(root != vcpu->arch.mmu->root_hpa);
+		BUG_ON(root != vcpu->arch.mmu->root.hpa);
 
 		iterator->shadow_addr
 			= vcpu->arch.mmu->pae_root[(addr >> 30) & 3];
@@ -2160,7 +2160,7 @@ static void shadow_walk_init_using_root(struct kvm_shadow_walk_iterator *iterato
 static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator,
 			     struct kvm_vcpu *vcpu, u64 addr)
 {
-	shadow_walk_init_using_root(iterator, vcpu, vcpu->arch.mmu->root_hpa,
+	shadow_walk_init_using_root(iterator, vcpu, vcpu->arch.mmu->root.hpa,
 				    addr);
 }
 
@@ -3229,7 +3229,7 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 	BUILD_BUG_ON(KVM_MMU_NUM_PREV_ROOTS >= BITS_PER_LONG);
 
 	/* Before acquiring the MMU lock, see if we need to do any real work. */
-	if (!(free_active_root && VALID_PAGE(mmu->root_hpa))) {
+	if (!(free_active_root && VALID_PAGE(mmu->root.hpa))) {
 		for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
 			if ((roots_to_free & KVM_MMU_ROOT_PREVIOUS(i)) &&
 			    VALID_PAGE(mmu->prev_roots[i].hpa))
@@ -3249,7 +3249,7 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 	if (free_active_root) {
 		if (mmu->shadow_root_level >= PT64_ROOT_4LEVEL &&
 		    (mmu->root_level >= PT64_ROOT_4LEVEL || mmu->direct_map)) {
-			mmu_free_root_page(kvm, &mmu->root_hpa, &invalid_list);
+			mmu_free_root_page(kvm, &mmu->root.hpa, &invalid_list);
 		} else if (mmu->pae_root) {
 			for (i = 0; i < 4; ++i) {
 				if (!IS_VALID_PAE_ROOT(mmu->pae_root[i]))
@@ -3260,8 +3260,8 @@ void kvm_mmu_free_roots(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 				mmu->pae_root[i] = INVALID_PAE_ROOT;
 			}
 		}
-		mmu->root_hpa = INVALID_PAGE;
-		mmu->root_pgd = 0;
+		mmu->root.hpa = INVALID_PAGE;
+		mmu->root.pgd = 0;
 	}
 
 	kvm_mmu_commit_zap_page(kvm, &invalid_list);
@@ -3334,10 +3334,10 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
 
 	if (is_tdp_mmu_enabled(vcpu->kvm)) {
 		root = kvm_tdp_mmu_get_vcpu_root_hpa(vcpu);
-		mmu->root_hpa = root;
+		mmu->root.hpa = root;
 	} else if (shadow_root_level >= PT64_ROOT_4LEVEL) {
 		root = mmu_alloc_root(vcpu, 0, 0, shadow_root_level, true);
-		mmu->root_hpa = root;
+		mmu->root.hpa = root;
 	} else if (shadow_root_level == PT32E_ROOT_LEVEL) {
 		if (WARN_ON_ONCE(!mmu->pae_root)) {
 			r = -EIO;
@@ -3352,15 +3352,15 @@ static int mmu_alloc_direct_roots(struct kvm_vcpu *vcpu)
 			mmu->pae_root[i] = root | PT_PRESENT_MASK |
 					   shadow_me_mask;
 		}
-		mmu->root_hpa = __pa(mmu->pae_root);
+		mmu->root.hpa = __pa(mmu->pae_root);
 	} else {
 		WARN_ONCE(1, "Bad TDP root level = %d\n", shadow_root_level);
 		r = -EIO;
 		goto out_unlock;
 	}
 
-	/* root_pgd is ignored for direct MMUs. */
-	mmu->root_pgd = 0;
+	/* root.pgd is ignored for direct MMUs. */
+	mmu->root.pgd = 0;
 out_unlock:
 	write_unlock(&vcpu->kvm->mmu_lock);
 	return r;
@@ -3473,7 +3473,7 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 	if (mmu->root_level >= PT64_ROOT_4LEVEL) {
 		root = mmu_alloc_root(vcpu, root_gfn, 0,
 				      mmu->shadow_root_level, false);
-		mmu->root_hpa = root;
+		mmu->root.hpa = root;
 		goto set_root_pgd;
 	}
 
@@ -3523,14 +3523,14 @@ static int mmu_alloc_shadow_roots(struct kvm_vcpu *vcpu)
 	}
 
 	if (mmu->shadow_root_level == PT64_ROOT_5LEVEL)
-		mmu->root_hpa = __pa(mmu->pml5_root);
+		mmu->root.hpa = __pa(mmu->pml5_root);
 	else if (mmu->shadow_root_level == PT64_ROOT_4LEVEL)
-		mmu->root_hpa = __pa(mmu->pml4_root);
+		mmu->root.hpa = __pa(mmu->pml4_root);
 	else
-		mmu->root_hpa = __pa(mmu->pae_root);
+		mmu->root.hpa = __pa(mmu->pae_root);
 
 set_root_pgd:
-	mmu->root_pgd = root_pgd;
+	mmu->root.pgd = root_pgd;
 out_unlock:
 	write_unlock(&vcpu->kvm->mmu_lock);
 
@@ -3643,13 +3643,13 @@ void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu)
 	if (vcpu->arch.mmu->direct_map)
 		return;
 
-	if (!VALID_PAGE(vcpu->arch.mmu->root_hpa))
+	if (!VALID_PAGE(vcpu->arch.mmu->root.hpa))
 		return;
 
 	vcpu_clear_mmio_info(vcpu, MMIO_GVA_ANY);
 
 	if (vcpu->arch.mmu->root_level >= PT64_ROOT_4LEVEL) {
-		hpa_t root = vcpu->arch.mmu->root_hpa;
+		hpa_t root = vcpu->arch.mmu->root.hpa;
 		sp = to_shadow_page(root);
 
 		if (!is_unsync_root(root))
@@ -3934,7 +3934,7 @@ static bool kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
 static bool is_page_fault_stale(struct kvm_vcpu *vcpu,
 				struct kvm_page_fault *fault, int mmu_seq)
 {
-	struct kvm_mmu_page *sp = to_shadow_page(vcpu->arch.mmu->root_hpa);
+	struct kvm_mmu_page *sp = to_shadow_page(vcpu->arch.mmu->root.hpa);
 
 	/* Special roots, e.g. pae_root, are not backed by shadow pages. */
 	if (sp && is_obsolete_sp(vcpu->kvm, sp))
@@ -4091,34 +4091,27 @@ static inline bool is_root_usable(struct kvm_mmu_root_info *root, gpa_t pgd,
 /*
  * Find out if a previously cached root matching the new pgd/role is available.
  * The current root is also inserted into the cache.
- * If a matching root was found, it is assigned to kvm_mmu->root_hpa and true is
+ * If a matching root was found, it is assigned to kvm_mmu->root.hpa and true is
  * returned.
- * Otherwise, the LRU root from the cache is assigned to kvm_mmu->root_hpa and
+ * Otherwise, the LRU root from the cache is assigned to kvm_mmu->root.hpa and
  * false is returned. This root should now be freed by the caller.
  */
 static bool cached_root_available(struct kvm_vcpu *vcpu, gpa_t new_pgd,
 				  union kvm_mmu_page_role new_role)
 {
 	uint i;
-	struct kvm_mmu_root_info root;
 	struct kvm_mmu *mmu = vcpu->arch.mmu;
 
-	root.pgd = mmu->root_pgd;
-	root.hpa = mmu->root_hpa;
-
-	if (is_root_usable(&root, new_pgd, new_role))
+	if (is_root_usable(&mmu->root, new_pgd, new_role))
 		return true;
 
 	for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
-		swap(root, mmu->prev_roots[i]);
+		swap(mmu->root, mmu->prev_roots[i]);
 
-		if (is_root_usable(&root, new_pgd, new_role))
+		if (is_root_usable(&mmu->root, new_pgd, new_role))
 			break;
 	}
 
-	mmu->root_hpa = root.hpa;
-	mmu->root_pgd = root.pgd;
-
 	return i < KVM_MMU_NUM_PREV_ROOTS;
 }
 
@@ -4174,7 +4167,7 @@ static void __kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd,
 	 */
 	if (!new_role.direct)
 		__clear_sp_write_flooding_count(
-				to_shadow_page(vcpu->arch.mmu->root_hpa));
+				to_shadow_page(vcpu->arch.mmu->root.hpa));
 }
 
 void kvm_mmu_new_pgd(struct kvm_vcpu *vcpu, gpa_t new_pgd)
@@ -5069,9 +5062,9 @@ int kvm_mmu_load(struct kvm_vcpu *vcpu)
 void kvm_mmu_unload(struct kvm_vcpu *vcpu)
 {
 	kvm_mmu_free_roots(vcpu, &vcpu->arch.root_mmu, KVM_MMU_ROOTS_ALL);
-	WARN_ON(VALID_PAGE(vcpu->arch.root_mmu.root_hpa));
+	WARN_ON(VALID_PAGE(vcpu->arch.root_mmu.root.hpa));
 	kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
-	WARN_ON(VALID_PAGE(vcpu->arch.guest_mmu.root_hpa));
+	WARN_ON(VALID_PAGE(vcpu->arch.guest_mmu.root.hpa));
 }
 
 static bool need_remote_flush(u64 old, u64 new)
@@ -5254,7 +5247,7 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
 	int r, emulation_type = EMULTYPE_PF;
 	bool direct = vcpu->arch.mmu->direct_map;
 
-	if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
+	if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root.hpa)))
 		return RET_PF_RETRY;
 
 	r = RET_PF_INVALID;
@@ -5326,7 +5319,7 @@ void kvm_mmu_invalidate_gva(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 		return;
 
 	if (root_hpa == INVALID_PAGE) {
-		mmu->invlpg(vcpu, gva, mmu->root_hpa);
+		mmu->invlpg(vcpu, gva, mmu->root.hpa);
 
 		/*
 		 * INVLPG is required to invalidate any global mappings for the VA,
@@ -5362,7 +5355,7 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
 	uint i;
 
 	if (pcid == kvm_get_active_pcid(vcpu)) {
-		mmu->invlpg(vcpu, gva, mmu->root_hpa);
+		mmu->invlpg(vcpu, gva, mmu->root.hpa);
 		tlb_flush = true;
 	}
 
@@ -5475,8 +5468,8 @@ static int __kvm_mmu_create(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu)
 	struct page *page;
 	int i;
 
-	mmu->root_hpa = INVALID_PAGE;
-	mmu->root_pgd = 0;
+	mmu->root.hpa = INVALID_PAGE;
+	mmu->root.pgd = 0;
 	for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++)
 		mmu->prev_roots[i] = KVM_MMU_ROOT_INFO_INVALID;
 

arch/x86/kvm/mmu/paging_tmpl.h

@@ -668,7 +668,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
 	if (FNAME(gpte_changed)(vcpu, gw, top_level))
 		goto out_gpte_changed;
 
-	if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
+	if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root.hpa)))
 		goto out_gpte_changed;
 
 	for (shadow_walk_init(&it, vcpu, fault->addr);

arch/x86/kvm/mmu/tdp_mmu.c

@@ -657,7 +657,7 @@ static inline void tdp_mmu_set_spte_no_dirty_log(struct kvm *kvm,
 		else
 
 #define tdp_mmu_for_each_pte(_iter, _mmu, _start, _end)		\
-	for_each_tdp_pte(_iter, to_shadow_page(_mmu->root_hpa), _start, _end)
+	for_each_tdp_pte(_iter, to_shadow_page(_mmu->root.hpa), _start, _end)
 
 /*
  * Yield if the MMU lock is contended or this thread needs to return control

arch/x86/kvm/mmu/tdp_mmu.h

@@ -95,7 +95,7 @@ static inline bool is_tdp_mmu_page(struct kvm_mmu_page *sp) { return sp->tdp_mmu
 static inline bool is_tdp_mmu(struct kvm_mmu *mmu)
 {
 	struct kvm_mmu_page *sp;
-	hpa_t hpa = mmu->root_hpa;
+	hpa_t hpa = mmu->root.hpa;
 
 	if (WARN_ON(!VALID_PAGE(hpa)))
 		return false;

arch/x86/kvm/vmx/nested.c

@@ -5466,7 +5466,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
 				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
 
 		roots_to_free = 0;
-		if (nested_ept_root_matches(mmu->root_hpa, mmu->root_pgd,
+		if (nested_ept_root_matches(mmu->root.hpa, mmu->root.pgd,
 					    operand.eptp))
 			roots_to_free |= KVM_MMU_ROOT_CURRENT;
 

arch/x86/kvm/vmx/vmx.c

@@ -2952,7 +2952,7 @@ static inline int vmx_get_current_vpid(struct kvm_vcpu *vcpu)
 static void vmx_flush_tlb_current(struct kvm_vcpu *vcpu)
 {
 	struct kvm_mmu *mmu = vcpu->arch.mmu;
-	u64 root_hpa = mmu->root_hpa;
+	u64 root_hpa = mmu->root.hpa;
 
 	/* No flush required if the current context is invalid. */
 	if (!VALID_PAGE(root_hpa))

arch/x86/kvm/x86.c

@@ -764,7 +764,7 @@ bool kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
 	if ((fault->error_code & PFERR_PRESENT_MASK) &&
 	    !(fault->error_code & PFERR_RSVD_MASK))
 		kvm_mmu_invalidate_gva(vcpu, fault_mmu, fault->address,
-				       fault_mmu->root_hpa);
+				       fault_mmu->root.hpa);
 
 	fault_mmu->inject_page_fault(vcpu, fault);
 	return fault->nested_page_fault;