[PATCH v4 5/6] KVM: Restrict kvm_get_kvm/kvm_put_kvm export to internal KVM modules

[Steffen Eiden <seiden@linux.ibm.com>]

Switch kvm_get_kvm, kvm_get_kvm_safe, and kvm_put_kvm from
EXPORT_SYMBOL_GPL to EXPORT_SYMBOL_FOR_KVM_INTERNAL. These symbols are
now only used within KVM itself. No external module needs them now that
VFIO uses file-based reference counting. Remove the corresponding
exemptions from the x86 KVM Makefile exports check.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
---
 arch/x86/kvm/Makefile | 5 +----
 virt/kvm/kvm_main.c   | 6 +++---
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index e6d395ede9e2..c6bf463f5032 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -61,10 +61,7 @@ exports_grep_trailer := --include='*.[ch]' -nrw $(srctree)/virt/kvm $(srctree)/a
 				-e kvm_page_track_unregister_notifier \
 				-e kvm_write_track_add_gfn \
 				-e kvm_write_track_remove_gfn \
-				-e kvm_file_to_kvm_fn \
-				-e kvm_get_kvm \
-				-e kvm_get_kvm_safe \
-				-e kvm_put_kvm
+				-e kvm_file_to_kvm_fn
 
 # Force grep to emit a goofy group separator that can in turn be replaced with
 # the above newline macro (newlines in Make are a nightmare).  Note, grep only
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 8e49ea809528..ff4fab9753ca 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1314,7 +1314,7 @@ void kvm_get_kvm(struct kvm *kvm)
 {
 	refcount_inc(&kvm->users_count);
 }
-EXPORT_SYMBOL_GPL(kvm_get_kvm);
+EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_get_kvm);
 
 /*
  * Make sure the vm is not during destruction, which is a safe version of
@@ -1324,14 +1324,14 @@ bool kvm_get_kvm_safe(struct kvm *kvm)
 {
 	return refcount_inc_not_zero(&kvm->users_count);
 }
-EXPORT_SYMBOL_GPL(kvm_get_kvm_safe);
+EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_get_kvm_safe);
 
 void kvm_put_kvm(struct kvm *kvm)
 {
 	if (refcount_dec_and_test(&kvm->users_count))
 		kvm_destroy_vm(kvm);
 }
-EXPORT_SYMBOL_GPL(kvm_put_kvm);
+EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_put_kvm);
 
 /*
  * Used to put a reference that was taken on behalf of an object associated

-- 
2.53.0