[PATCH 18/31] KVM: Encapsulate memattrs array into anonymous struct

[Paolo Bonzini <pbonzini@redhat.com>]

From: Nicolas Saenz Julienne <nsaenz@amazon.com>

The metadata surrounding memory attributes is about to grow, so
encapsulate the memory attributes array within an anonymous struct to
provide namespacing.

Signed-off-by: Nicolas Saenz Julienne <nsaenz@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/linux/kvm_host.h |  8 +++++---
 virt/kvm/kvm_main.c      | 10 +++++-----
 2 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index cddf0b943757..24d04322d89e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -875,8 +875,10 @@ struct kvm {
 	struct notifier_block pm_notifier;
 #endif
 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
-	/* Protected by slots_lock (for writes) and RCU (for reads) */
-	struct xarray mem_attr_array;
+	struct {
+		/* Protected by slots_lock (for writes) and RCU (for reads) */
+		struct xarray array;
+	} mem_attrs;
 #endif
 	char stats_id[KVM_STATS_NAME_SIZE];
 };
@@ -2592,7 +2594,7 @@ static inline bool kvm_mem_attributes_may_exec(u64 attrs)
 
 static inline unsigned long kvm_get_memory_attributes(struct kvm *kvm, gfn_t gfn)
 {
-	return xa_to_value(xa_load(&kvm->mem_attr_array, gfn));
+	return xa_to_value(xa_load(&kvm->mem_attrs.array, gfn));
 }
 
 bool kvm_range_has_memory_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1d111502b8c1..b8e419fb6cbf 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1117,7 +1117,7 @@ static struct kvm *kvm_create_vm(unsigned long type, const char *fdname)
 	rcuwait_init(&kvm->mn_memslots_update_rcuwait);
 	xa_init(&kvm->vcpu_array);
 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
-	xa_init(&kvm->mem_attr_array);
+	xa_init(&kvm->mem_attrs.array);
 #endif
 
 	INIT_LIST_HEAD(&kvm->gpc_list);
@@ -1302,7 +1302,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
 	srcu_barrier(&kvm->srcu);
 	cleanup_srcu_struct(&kvm->srcu);
 #ifdef CONFIG_KVM_GENERIC_MEMORY_ATTRIBUTES
-	xa_destroy(&kvm->mem_attr_array);
+	xa_destroy(&kvm->mem_attrs.array);
 #endif
 	kvm_arch_free_vm(kvm);
 	preempt_notifier_dec();
@@ -2440,7 +2440,7 @@ u64 kvm_supported_mem_attributes(struct kvm *kvm)
 bool kvm_range_has_memory_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
 				     unsigned long mask, unsigned long attrs)
 {
-	XA_STATE(xas, &kvm->mem_attr_array, start);
+	XA_STATE(xas, &kvm->mem_attrs.array, start);
 	unsigned long supported_attrs;
 	unsigned long index;
 	void *entry;
@@ -2579,7 +2579,7 @@ static int kvm_vm_set_mem_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
 	 * partway through setting the new attributes.
 	 */
 	for (i = start; i < end; i++) {
-		r = xa_reserve(&kvm->mem_attr_array, i, GFP_KERNEL_ACCOUNT);
+		r = xa_reserve(&kvm->mem_attrs.array, i, GFP_KERNEL_ACCOUNT);
 		if (r)
 			goto out_unlock;
 
@@ -2589,7 +2589,7 @@ static int kvm_vm_set_mem_attributes(struct kvm *kvm, gfn_t start, gfn_t end,
 	kvm_handle_gfn_range(kvm, &pre_set_range);
 
 	for (i = start; i < end; i++) {
-		r = xa_err(xa_store(&kvm->mem_attr_array, i, entry,
+		r = xa_err(xa_store(&kvm->mem_attrs.array, i, entry,
 				    GFP_KERNEL_ACCOUNT));
 		KVM_BUG_ON(r, kvm);
 		cond_resched();
-- 
2.52.0