diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
index 411b8c69e628..624897ccb3de 100644
--- a/arch/x86/coco/tdx/tdx.c
+++ b/arch/x86/coco/tdx/tdx.c
@@ -39,6 +39,8 @@
 
 #define TDREPORT_SUBTYPE_0	0
 
+static atomic_long_t nr_shared;
+
 /* Called from __tdx_hypercall() for unrecoverable failure */
 noinstr void __noreturn __tdx_hypercall_failed(void)
 {
@@ -826,6 +828,11 @@ static int tdx_enc_status_change_finish(unsigned long vaddr, int numpages,
 	if (!enc && !tdx_enc_status_changed(vaddr, numpages, enc))
 		return -EIO;
 
+	if (enc)
+		atomic_long_sub(numpages, &nr_shared);
+	else
+		atomic_long_add(numpages, &nr_shared);
+
 	return 0;
 }