diff --git a/hw/cxl/cxl-device-utils.c b/hw/cxl/cxl-device-utils.c
index 83ce7a8270..4c5e88aaf5 100644
--- a/hw/cxl/cxl-device-utils.c
+++ b/hw/cxl/cxl-device-utils.c
@@ -267,5 +267,5 @@ void cxl_device_register_init_common(CXLDeviceState *cxl_dstate)
     cxl_device_cap_init(cxl_dstate, MEMORY_DEVICE, 0x4000);
     memdev_reg_init_common(cxl_dstate);
 
-    assert(cxl_initialize_mailbox(cxl_dstate) == 0);
+    cxl_initialize_mailbox(cxl_dstate);
 }
diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 3f67b665f5..206e04a4b8 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -193,7 +193,11 @@ static ret_code cmd_timestamp_set(struct cxl_cmd *cmd,
     return CXL_MBOX_SUCCESS;
 }
 
-static QemuUUID cel_uuid;
+/* CXL 3.0 8.2.9.5.2.1 Command Effects Log (CEL) */
+static const QemuUUID cel_uuid = {
+    .data = UUID(0x0da9c0b5, 0xbf41, 0x4b78, 0x8f, 0x79,
+                 0x96, 0xb1, 0x62, 0x3b, 0x3f, 0x17)
+};
 
 /* 8.2.9.4.1 */
 static ret_code cmd_logs_get_supported(struct cxl_cmd *cmd,
@@ -458,11 +462,8 @@ void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
                      DOORBELL, 0);
 }
 
-int cxl_initialize_mailbox(CXLDeviceState *cxl_dstate)
+void cxl_initialize_mailbox(CXLDeviceState *cxl_dstate)
 {
-    /* CXL 2.0: Table 169 Get Supported Logs Log Entry */
-    const char *cel_uuidstr = "0da9c0b5-bf41-4b78-8f79-96b1623b3f17";
-
     for (int set = 0; set < 256; set++) {
         for (int cmd = 0; cmd < 256; cmd++) {
             if (cxl_cmd_set[set][cmd].handler) {
@@ -476,6 +477,4 @@ int cxl_initialize_mailbox(CXLDeviceState *cxl_dstate)
             }
         }
     }
-
-    return qemu_uuid_parse(cel_uuidstr, &cel_uuid);
 }
diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
index 250adf18b2..7e5ad65c1d 100644
--- a/include/hw/cxl/cxl_device.h
+++ b/include/hw/cxl/cxl_device.h
@@ -170,7 +170,7 @@ CXL_DEVICE_CAPABILITY_HEADER_REGISTER(MEMORY_DEVICE,
                                       CXL_DEVICE_CAP_HDR1_OFFSET +
                                           CXL_DEVICE_CAP_REG_SIZE * 2)
 
-int cxl_initialize_mailbox(CXLDeviceState *cxl_dstate);
+void cxl_initialize_mailbox(CXLDeviceState *cxl_dstate);
 void cxl_process_mailbox(CXLDeviceState *cxl_dstate);
 
 #define cxl_device_cap_init(dstate, reg, cap_id)                           \