Adding newest psp-sev.h file. Supports get_id2

Todo, add get_id2 support to sev-tool

lib/psp-sev.h

@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Userspace interface for AMD Secure Encrypted Virtualization (SEV)
  * platform management commands.
@@ -6,12 +7,7 @@
  *
  * Author: Brijesh Singh <[email protected]>
  *
- * 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 @@ enum {
     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 @@ struct sev_user_data_pdh_cert_export {
 } __attribute__((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
@@ -135,6 +132,16 @@ struct sev_user_data_get_id {
     __u8 socket2[64];              /* Out */
 } __attribute__((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 */
+} __attribute__((packed));
+
 /**
  * struct sev_issue_cmd - SEV ioctl parameters
  *