lkml.org 
[lkml]   [2018]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/mm] x86/pconfig: Provide defines and helper to run MKTME_KEY_PROG leaf
Commit-ID:  24c517856af6511be1339dd55edd131160e37aac
Gitweb: https://git.kernel.org/tip/24c517856af6511be1339dd55edd131160e37aac
Author: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
AuthorDate: Mon, 5 Mar 2018 19:25:53 +0300
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 12 Mar 2018 12:10:54 +0100

x86/pconfig: Provide defines and helper to run MKTME_KEY_PROG leaf

MKTME_KEY_PROG allows to manipulate MKTME keys in the CPU.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Kai Huang <kai.huang@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20180305162610.37510-6-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/include/asm/intel_pconfig.h | 50 ++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)

diff --git a/arch/x86/include/asm/intel_pconfig.h b/arch/x86/include/asm/intel_pconfig.h
index fb7a37c3798b..3cb002b1d0f9 100644
--- a/arch/x86/include/asm/intel_pconfig.h
+++ b/arch/x86/include/asm/intel_pconfig.h
@@ -12,4 +12,54 @@ enum pconfig_target {

int pconfig_target_supported(enum pconfig_target target);

+enum pconfig_leaf {
+ MKTME_KEY_PROGRAM = 0,
+ PCONFIG_LEAF_INVALID,
+};
+
+#define PCONFIG ".byte 0x0f, 0x01, 0xc5"
+
+/* Defines and structure for MKTME_KEY_PROGRAM of PCONFIG instruction */
+
+/* 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)
+
+/* Return codes from the PCONFIG MKTME_KEY_PROGRAM */
+#define MKTME_PROG_SUCCESS 0
+#define MKTME_INVALID_PROG_CMD 1
+#define MKTME_ENTROPY_ERROR 2
+#define MKTME_INVALID_KEYID 3
+#define MKTME_INVALID_ENC_ALG 4
+#define MKTME_DEVICE_BUSY 5
+
+/* Hardware requires the structure to be 256 byte alinged. Otherwise #GP(0). */
+struct mktme_key_program {
+ u16 keyid;
+ u32 keyid_ctrl;
+ u8 __rsvd[58];
+ u8 key_field_1[64];
+ u8 key_field_2[64];
+} __packed __aligned(256);
+
+static inline int mktme_key_program(struct mktme_key_program *key_program)
+{
+ unsigned long rax = MKTME_KEY_PROGRAM;
+
+ if (!pconfig_target_supported(MKTME_TARGET))
+ return -ENXIO;
+
+ asm volatile(PCONFIG
+ : "=a" (rax), "=b" (key_program)
+ : "0" (rax), "1" (key_program)
+ : "memory", "cc");
+
+ return rax;
+}
+
#endif /* _ASM_X86_INTEL_PCONFIG_H */
\
 
 \ /
  Last update: 2018-03-12 13:24    [W:0.180 / U:0.428 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site