linux-kernel - [PATCH, RFC 22/62] x86/pconfig: Set a valid encryption algorithm for all MKTME commands

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Date:   Wed,  8 May 2019 17:43:42 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        David Howells <dhowells@...hat.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Kai Huang <kai.huang@...ux.intel.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Alison Schofield <alison.schofield@...el.com>,
        linux-mm@...ck.org, kvm@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH, RFC 22/62] x86/pconfig: Set a valid encryption algorithm for all MKTME commands

From: Alison Schofield <alison.schofield@...el.com>

The Intel MKTME architecture specification requires a valid encryption
algorithm for all command types.

For commands that actually perform encryption, SET_KEY_DIRECT and
SET_KEY_RANDOM, the user specifies the algorithm when requesting the
key through the MKTME Key Service.

For CLEAR_KEY and NO_ENCRYPT commands, a valid encryption algorithm is
also required by the MKTME hardware. However, it does not make sense to
ask userspace to specify one. Define the CLEAR_KEY and NO_ENCRYPT type
commands to always include a valid encryption algorithm.

Signed-off-by: Alison Schofield <alison.schofield@...el.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/x86/include/asm/intel_pconfig.h | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/include/asm/intel_pconfig.h b/arch/x86/include/asm/intel_pconfig.h
index 3cb002b1d0f9..15705699a14e 100644
--- a/arch/x86/include/asm/intel_pconfig.h
+++ b/arch/x86/include/asm/intel_pconfig.h
@@ -21,14 +21,20 @@ enum pconfig_leaf {
 
 /* Defines and structure for MKTME_KEY_PROGRAM of PCONFIG instruction */
 
+/* mktme_key_program::keyid_ctrl ENC_ALG, bits [23:8] */
+#define MKTME_AES_XTS_128	(1 << 8)
+#define MKTME_ANY_VALID_ALG	(1 << 8)
+
 /* mktme_key_program::keyid_ctrl COMMAND, bits [7:0] */
 #define MKTME_KEYID_SET_KEY_DIRECT	0
 #define MKTME_KEYID_SET_KEY_RANDOM	1
-#define MKTME_KEYID_CLEAR_KEY		2
-#define MKTME_KEYID_NO_ENCRYPT		3
 
-/* mktme_key_program::keyid_ctrl ENC_ALG, bits [23:8] */
-#define MKTME_AES_XTS_128	(1 << 8)
+/*
+ * CLEAR_KEY and NO_ENCRYPT require the COMMAND in bits [7:0]
+ * and any valid encryption algorithm, ENC_ALG, in bits [23:8]
+ */
+#define MKTME_KEYID_CLEAR_KEY  (2 | MKTME_ANY_VALID_ALG)
+#define MKTME_KEYID_NO_ENCRYPT (3 | MKTME_ANY_VALID_ALG)
 
 /* Return codes from the PCONFIG MKTME_KEY_PROGRAM */
 #define MKTME_PROG_SUCCESS	0
-- 
2.20.1