Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h
index ac8c60b..592a0c1 100644
--- a/include/uapi/linux/psp-sev.h
+++ b/include/uapi/linux/psp-sev.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only WITH Linux-syscall-note */
 /*
  * Userspace interface for AMD Secure Encrypted Virtualization (SEV)
  * platform management commands.
@@ -6,12 +7,7 @@
  *
  * Author: Brijesh Singh <brijesh.singh@amd.com>
  *
- * SEV spec 0.14 is available at:
- * http://support.amd.com/TechDocs/55766_SEV-KM%20API_Specification.pdf
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
+ * SEV API specification is available at: https://developer.amd.com/sev/
  */
 
 #ifndef __PSP_SEV_USER_H__
@@ -30,7 +26,8 @@
 	SEV_PDH_GEN,
 	SEV_PDH_CERT_EXPORT,
 	SEV_PEK_CERT_IMPORT,
-	SEV_GET_ID,
+	SEV_GET_ID,	/* This command is deprecated, use SEV_GET_ID2 */
+	SEV_GET_ID2,
 
 	SEV_MAX,
 };
@@ -125,7 +122,7 @@
 } __packed;
 
 /**
- * struct sev_user_data_get_id - GET_ID command parameters
+ * struct sev_user_data_get_id - GET_ID command parameters (deprecated)
  *
  * @socket1: Buffer to pass unique ID of first socket
  * @socket2: Buffer to pass unique ID of second socket
@@ -136,6 +133,16 @@
 } __packed;
 
 /**
+ * struct sev_user_data_get_id2 - GET_ID command parameters
+ * @address: Buffer to store unique ID
+ * @length: length of the unique ID
+ */
+struct sev_user_data_get_id2 {
+	__u64 address;				/* In */
+	__u32 length;				/* In/Out */
+} __packed;
+
+/**
  * struct sev_issue_cmd - SEV ioctl parameters
  *
  * @cmd: SEV commands to execute