* Elliot Berman [off-list ref] [2023-01-20 14:46:11]:

+static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_mem_parcel *p)
+{
+	size_t msg_size = 0, initial_n_mem_entries = p->n_mem_entries;
+	void *msg;
+	__le32 *resp;
+	struct gh_mem_share_req_header *req_header;
+	struct gh_mem_share_req_acl_section *acl_section;
+	struct gh_mem_share_req_mem_section *mem_section;
+	u32 *mem_attr_section;
+	size_t resp_size;
+	int ret;
+
+	if (!p->acl_entries || !p->n_acl_entries || !p->mem_entries || !p->n_mem_entries ||
+	    p->n_acl_entries > U8_MAX || p->mem_handle != GH_MEM_HANDLE_INVAL)
+		return -EINVAL;
+
+	if (initial_n_mem_entries > GH_RM_MAX_MEM_ENTRIES)
+		initial_n_mem_entries = GH_RM_MAX_MEM_ENTRIES;
+
+	/* The format of the message goes:
+	 * request header
+	 * ACL entries (which VMs get what kind of access to this memory parcel)
+	 * Memory entries (list of memory regions to share)
+	 * Memory attributes (currently unused, we'll hard-code the size to 0)
+	 */
+	msg_size += sizeof(struct gh_mem_share_req_header);
+	msg_size += offsetof(struct gh_mem_share_req_acl_section, entries[p->n_acl_entries]);
+	msg_size += offsetof(struct gh_mem_share_req_mem_section, entries[initial_n_mem_entries]);
+	msg_size += sizeof(u32); /* for memory attributes, currently unused */
+
+	msg = kzalloc(msg_size, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	ret = gh_rm_platform_pre_mem_share(rm, p);

Hmm ..I think gh_rm_platform_pre_mem_share() is not yet defined as of this
patch, so you probably want this in a later patch.

+	if (ret) {
+		kfree(msg);
+		return ret;
+	}
+

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