[PATCH 1/6] KVM: Open code kvm_set_memory_region() into its sole caller (ioctl() API)

[Sean Christopherson <seanjc@google.com>]

Open code kvm_set_memory_region() into its sole caller in preparation for
adding a dedicated API for setting internal memslots.

Oppurtunistically use the fancy new guard(mutex) to avoid a local 'r'
variable.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 include/linux/kvm_host.h |  2 --
 virt/kvm/kvm_main.c      | 15 ++-------------
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 689e8be873a7..b341d00aae37 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1179,8 +1179,6 @@ enum kvm_mr_change {
 	KVM_MR_FLAGS_ONLY,
 };
 
-int kvm_set_memory_region(struct kvm *kvm,
-			  const struct kvm_userspace_memory_region2 *mem);
 int __kvm_set_memory_region(struct kvm *kvm,
 			    const struct kvm_userspace_memory_region2 *mem);
 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d0788d0a72cc..0557d663b69b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2105,25 +2105,14 @@ int __kvm_set_memory_region(struct kvm *kvm,
 }
 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
 
-int kvm_set_memory_region(struct kvm *kvm,
-			  const struct kvm_userspace_memory_region2 *mem)
-{
-	int r;
-
-	mutex_lock(&kvm->slots_lock);
-	r = __kvm_set_memory_region(kvm, mem);
-	mutex_unlock(&kvm->slots_lock);
-	return r;
-}
-EXPORT_SYMBOL_GPL(kvm_set_memory_region);
-
 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
 					  struct kvm_userspace_memory_region2 *mem)
 {
 	if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
 		return -EINVAL;
 
-	return kvm_set_memory_region(kvm, mem);
+	guard(mutex)(&kvm->slots_lock);
+	return  __kvm_set_memory_region(kvm, mem);
 }
 
 #ifndef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
-- 
2.46.0.rc2.264.g509ed76dc8-goog