[PATCHv2 23/59] x86/pconfig: Set an activated algorithm in all MKTME commands

Kirill A. Shutemov
2019-07-31T15:09:22Z

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

The Intel MKTME architecture specification requires an activated
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, do not require the user to
specify an algorithm. Define a default algorithm, that is 'any
activated algorithm' to cover those two special cases.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.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..4f27b0c532ee 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_ACTIVATED_ALG (1 << __ffs(mktme_algs) << 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 activated encryption algorithm, ENC_ALG, in bits [23:8]
+ */
+#define MKTME_KEYID_CLEAR_KEY (2 | MKTME_ANY_ACTIVATED_ALG)
+#define MKTME_KEYID_NO_ENCRYPT (3 | MKTME_ANY_ACTIVATED_ALG)

/* Return codes from the PCONFIG MKTME_KEY_PROGRAM */
#define MKTME_PROG_SUCCESS 0
--
2.21.0