Only Device TX direction KEY/IV are generated by CXL_GETKEY if capable

Signed-off-by: Min Xu <[email protected]>

Author: mxu9

teeio-validator/library/cxl_ide_test_lib/test_case/ide_km_common.c

@@ -70,7 +70,11 @@ static bool cxl_ide_generate_key(const void *pci_doe_context,
     memset(key_buffer->key, direction == CXL_IDE_KM_KEY_DIRECTION_RX ? TEEIO_TEST_FIXED_RX_KEY_BYTE_VALUE : TEEIO_TEST_FIXED_TX_KEY_BYTE_VALUE, sizeof(key_buffer->key));
     *cxl_ide_km_iv = CXL_IDE_KM_KEY_IV_DEFAULT;
   } else {
-    if(key_iv_gen_capable) {
+
+    // According to CXL Spec 3.1 Section 11.4.5, if iv_generation_capable and key_generation_capable are supported,
+    // key/iv for Device TX direction is recommended to be generated by sending CXL_GETKEY to device (which will then
+    // generate the key/iv in device side).
+    if(key_iv_gen_capable && direction == CXL_IDE_KM_KEY_DIRECTION_TX) {
       TEEIO_DEBUG((TEEIO_DEBUG_INFO, "Generate key/iv in device with cxl_ide_km_get_key.\n"));
       memset(key_buffer->iv, 0, sizeof(key_buffer->iv));
       status = cxl_ide_km_get_key(pci_doe_context, spdm_context, session_id,