KVM: Fix comments that refer to the non-existent install_new_memslots()

Fix stale comments that were left behind when install_new_memslots() was
replaced by kvm_swap_active_memslots() as part of the scalable memslots
rework.

Fixes: a54d806688 ("KVM: Keep memslots in tree-based structures instead of array-based ones")
Signed-off-by: Jun Miao <jun.miao@intel.com>
Link: https://lore.kernel.org/r/20230223052851.1054799-1-jun.miao@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Documentation/virt/kvm/locking.rst

@@ -21,7 +21,7 @@ The acquisition orders for mutexes are as follows:
 - kvm->mn_active_invalidate_count ensures that pairs of
   invalidate_range_start() and invalidate_range_end() callbacks
   use the same memslots array.  kvm->slots_lock and kvm->slots_arch_lock
-  are taken on the waiting side in install_new_memslots, so MMU notifiers
+  are taken on the waiting side when modifying memslots, so MMU notifiers
   must not take either kvm->slots_lock or kvm->slots_arch_lock.
 
 For SRCU:

include/linux/kvm_host.h

@@ -58,7 +58,7 @@
 
 /*
  * Bit 63 of the memslot generation number is an "update in-progress flag",
- * e.g. is temporarily set for the duration of install_new_memslots().
+ * e.g. is temporarily set for the duration of kvm_swap_active_memslots().
  * This flag effectively creates a unique generation number that is used to
  * mark cached memslot data, e.g. MMIO accesses, as potentially being stale,
  * i.e. may (or may not) have come from the previous memslots generation.
@@ -713,7 +713,7 @@ struct kvm {
 	 * use by the VM. To be used under the slots_lock (above) or in a
 	 * kvm->srcu critical section where acquiring the slots_lock would
 	 * lead to deadlock with the synchronize_srcu in
-	 * install_new_memslots.
+	 * kvm_swap_active_memslots().
 	 */
 	struct mutex slots_arch_lock;
 	struct mm_struct *mm; /* userspace tied to this vm */

virt/kvm/kvm_main.c

@@ -1298,7 +1298,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
 	 * At this point, pending calls to invalidate_range_start()
 	 * have completed but no more MMU notifiers will run, so
 	 * mn_active_invalidate_count may remain unbalanced.
-	 * No threads can be waiting in install_new_memslots as the
+	 * No threads can be waiting in kvm_swap_active_memslots() as the
 	 * last reference on KVM has been dropped, but freeing
 	 * memslots would deadlock without this manual intervention.
 	 */
@@ -1742,13 +1742,13 @@ static void kvm_invalidate_memslot(struct kvm *kvm,
 	kvm_arch_flush_shadow_memslot(kvm, old);
 	kvm_arch_guest_memory_reclaimed(kvm);
 
-	/* Was released by kvm_swap_active_memslots, reacquire. */
+	/* Was released by kvm_swap_active_memslots(), reacquire. */
 	mutex_lock(&kvm->slots_arch_lock);
 
 	/*
 	 * Copy the arch-specific field of the newly-installed slot back to the
 	 * old slot as the arch data could have changed between releasing
-	 * slots_arch_lock in install_new_memslots() and re-acquiring the lock
+	 * slots_arch_lock in kvm_swap_active_memslots() and re-acquiring the lock
 	 * above.  Writers are required to retrieve memslots *after* acquiring
 	 * slots_arch_lock, thus the active slot's data is guaranteed to be fresh.
 	 */
@@ -1810,11 +1810,11 @@ static int kvm_set_memslot(struct kvm *kvm,
 	int r;
 
 	/*
-	 * Released in kvm_swap_active_memslots.
+	 * Released in kvm_swap_active_memslots().
 	 *
-	 * Must be held from before the current memslots are copied until
-	 * after the new memslots are installed with rcu_assign_pointer,
-	 * then released before the synchronize srcu in kvm_swap_active_memslots.
+	 * Must be held from before the current memslots are copied until after
+	 * the new memslots are installed with rcu_assign_pointer, then
+	 * released before the synchronize srcu in kvm_swap_active_memslots().
 	 *
 	 * When modifying memslots outside of the slots_lock, must be held
 	 * before reading the pointer to the current memslots until after all