diff --git a/prov/efa/src/efa_mr.c b/prov/efa/src/efa_mr.c
index 0e540109fbd..44bc4f6efd3 100644
--- a/prov/efa/src/efa_mr.c
+++ b/prov/efa/src/efa_mr.c
@@ -337,47 +337,6 @@ void efa_mr_cache_entry_dereg(struct ofi_mr_cache *cache,
 		EFA_WARN(FI_LOG_MR, "Unable to dereg mr: %d\n", ret);
 }
 
-/*
- * efa_mr_reg_shm() is called by rxr_read_init_iov to used to generate
- * shm only memory registrations. Such memory registrations were used
- * when read message protocol was applied to SHM EP. In which case,
- * we need to register the send iov as FI_REMOTE_READ.
- *
- * Note when we open the SHM domain we did not specify FI_MR_PROV_KEY
- * therefore the SHM domain require us to proivde a key when calling
- * fi_mr_reg on it. (rxr_set_shm_hints())
- *
- * The reason we did not specify FI_MR_PROV_KEY when opening SHM
- * domain is because we want ibv_mr and shm_mr to use the same
- * key. For that, we first call ibv_reg_mr() to register memory
- * and get a key, and use that key to register shm. (efa_m_reg_impl())
- *
- * However, for SHM's read message protocol, we do not want to call
- * ibv_reg_mr() because it is expensive, so we use a static variable
- * SHM_MR_KEYGEN to generate key.
- *
- * It is initialized as 0x100000000, and each call to efa_mr_reg_shm()
- * will use shm_mr_keygen as current key and increase it by 1.
- *
- * Note SHM_MR_KEYGEN starts from 0x100000000 because the key
- * returned from ibv_reg_mr() is a 32 bits integer, thus is always
- * smaller than 0x100000000. By starting from 0x100000000, we avoid
- * key collision.
- */
-int efa_mr_reg_shm(struct fid_domain *domain_fid, struct iovec *iov,
-		   uint64_t access, struct fid_mr **mr_fid)
-{
-	static uint64_t SHM_MR_KEYGEN =	SHM_MR_KEYGEN_INIT;
-	uint64_t requested_key;
-	struct efa_domain *efa_domain;
-
-	efa_domain = container_of(domain_fid, struct efa_domain, util_domain.domain_fid.fid);
-	assert(efa_domain->shm_domain);
-
-	requested_key = SHM_MR_KEYGEN++;
-	return fi_mr_regv(efa_domain->shm_domain, iov, 1, access, 0, requested_key, 0, mr_fid, NULL);
-}
-
 static int efa_mr_cache_regattr(struct fid *fid, const struct fi_mr_attr *attr,
 				uint64_t flags, struct fid_mr **mr_fid)
 {
diff --git a/prov/efa/src/efa_mr.h b/prov/efa/src/efa_mr.h
index 83f9cacf781..9e6ac545cbf 100644
--- a/prov/efa/src/efa_mr.h
+++ b/prov/efa/src/efa_mr.h
@@ -80,9 +80,6 @@ int efa_mr_cache_entry_reg(struct ofi_mr_cache *cache,
 void efa_mr_cache_entry_dereg(struct ofi_mr_cache *cache,
 			      struct ofi_mr_entry *entry);
 
-int efa_mr_reg_shm(struct fid_domain *domain_fid, struct iovec *iov,
-		   uint64_t access, struct fid_mr **mr_fid);
-
 static inline bool efa_mr_is_hmem(struct efa_mr *efa_mr)
 {
 	return efa_mr ? (efa_mr->peer.iface == FI_HMEM_CUDA ||