linux-kernel - [PATCHv2 24/59] keys/mktme: Introduce a Kernel Key Service for MKTME

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Message-Id: <20190731150813.26289-25-kirill.shutemov@linux.intel.com>
Date:   Wed, 31 Jul 2019 18:07:38 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
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: [PATCHv2 24/59] keys/mktme: Introduce a Kernel Key Service for MKTME

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

MKTME (Multi-Key Total Memory Encryption) is a technology that allows
transparent memory encryption in upcoming Intel platforms. MKTME will
support multiple encryption domains, each having their own key.

The MKTME key service will manage the hardware encryption keys. It
will map Userspace Keys to Hardware KeyIDs and program the hardware
with the user requested encryption options.

Here the mapping structure is introduced, as well as the key service
initialization and registration.

Signed-off-by: Alison Schofield <alison.schofield@...el.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 security/keys/Makefile     |  1 +
 security/keys/mktme_keys.c | 60 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 61 insertions(+)
 create mode 100644 security/keys/mktme_keys.c

diff --git a/security/keys/Makefile b/security/keys/Makefile
index 9cef54064f60..28799be801a9 100644
--- a/security/keys/Makefile
+++ b/security/keys/Makefile
@@ -30,3 +30,4 @@ obj-$(CONFIG_ASYMMETRIC_KEY_TYPE) += keyctl_pkey.o
 obj-$(CONFIG_BIG_KEYS) += big_key.o
 obj-$(CONFIG_TRUSTED_KEYS) += trusted.o
 obj-$(CONFIG_ENCRYPTED_KEYS) += encrypted-keys/
+obj-$(CONFIG_X86_INTEL_MKTME) += mktme_keys.o
diff --git a/security/keys/mktme_keys.c b/security/keys/mktme_keys.c
new file mode 100644
index 000000000000..d262e0f348e4
--- /dev/null
+++ b/security/keys/mktme_keys.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0
+
+/* Documentation/x86/mktme/ */
+
+#include <linux/init.h>
+#include <linux/key.h>
+#include <linux/key-type.h>
+#include <linux/mm.h>
+#include <keys/user-type.h>
+
+#include "internal.h"
+
+static unsigned int mktme_available_keyids;  /* Free Hardware KeyIDs */
+
+enum mktme_keyid_state {
+	KEYID_AVAILABLE,	/* Available to be assigned */
+	KEYID_ASSIGNED,		/* Assigned to a userspace key */
+	KEYID_REF_KILLED,	/* Userspace key has been destroyed */
+	KEYID_REF_RELEASED,	/* Last reference is released */
+};
+
+/* 1:1 Mapping between Userspace Keys (struct key) and Hardware KeyIDs */
+struct mktme_mapping {
+	struct key		*key;
+	enum mktme_keyid_state	state;
+};
+
+static struct mktme_mapping *mktme_map;
+
+struct key_type key_type_mktme = {
+	.name		= "mktme",
+	.describe	= user_describe,
+};
+
+static int __init init_mktme(void)
+{
+	int ret;
+
+	/* Verify keys are present */
+	if (mktme_nr_keyids() < 1)
+		return 0;
+
+	mktme_available_keyids = mktme_nr_keyids();
+
+	/* Mapping of Userspace Keys to Hardware KeyIDs */
+	mktme_map = kvzalloc((sizeof(*mktme_map) * (mktme_nr_keyids() + 1)),
+			     GFP_KERNEL);
+	if (!mktme_map)
+		return -ENOMEM;
+
+	ret = register_key_type(&key_type_mktme);
+	if (!ret)
+		return ret;			/* SUCCESS */
+
+	kvfree(mktme_map);
+
+	return -ENOMEM;
+}
+
+late_initcall(init_mktme);
-- 
2.21.0