From: Greg Joyce <gjoyce@xxxxxxxxxxxxxxxxxx>
Define operations for SED Opal to read/write keys
from POWER LPAR Platform KeyStore(PLPKS). This allows
for non-volatile storage of SED Opal keys.
Signed-off-by: Greg Joyce <gjoyce@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Jonathan Derrick <jonathan.derrick@xxxxxxxxx>
---
arch/powerpc/platforms/pseries/Makefile | 1 +
.../powerpc/platforms/pseries/plpks_sed_ops.c | 129 ++++++++++++++++++
2 files changed, 130 insertions(+)
create mode 100644 arch/powerpc/platforms/pseries/plpks_sed_ops.c
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 92310202bdd7..5bedc06ee2cc 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_PPC_SPLPAR) += vphn.o
obj-$(CONFIG_PPC_SVM) += svm.o
obj-$(CONFIG_FA_DUMP) += rtas-fadump.o
obj-$(CONFIG_PSERIES_PLPKS) += plpks.o
+obj-$(CONFIG_PSERIES_PLPKS) += plpks_sed_ops.o
obj-$(CONFIG_SUSPEND) += suspend.o
obj-$(CONFIG_PPC_VAS) += vas.o vas-sysfs.o
diff --git a/arch/powerpc/platforms/pseries/plpks_sed_ops.c b/arch/powerpc/platforms/pseries/plpks_sed_ops.c
new file mode 100644
index 000000000000..cd1084d07716
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/plpks_sed_ops.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * POWER Platform specific code for non-volatile SED key access
+ * Copyright (C) 2022 IBM Corporation
+ *
+ * Define operations for SED Opal to read/write keys
+ * from POWER LPAR Platform KeyStore(PLPKS).
+ *
+ * Self Encrypting Drives(SED) key storage using PLPKS
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/ioctl.h>
+#include <linux/sed-opal-key.h>
+#include "plpks.h"
+
+/*
+ * structure that contains all SED data
+ */
+struct plpks_sed_object_data {
+ u_char version;
+ u_char pad1[7];
+ u_long authority;
+ u_long range;
+ u_int key_len;
+ u_char key[32];
+};
+
+#define PLPKS_PLATVAR_POLICY WORLDREADABLE
+#define PLPKS_PLATVAR_OS_COMMON 4
+
+#define PLPKS_SED_OBJECT_DATA_V0 0
+#define PLPKS_SED_MANGLED_LABEL "/default/pri"
+#define PLPKS_SED_COMPONENT "sed-opal"
+#define PLPKS_SED_KEY "opal-boot-pin"
+
+/*
+ * authority is admin1 and range is global
+ */
+#define PLPKS_SED_AUTHORITY 0x0000000900010001
+#define PLPKS_SED_RANGE 0x0000080200000001
+
+void plpks_init_var(struct plpks_var *var, char *keyname)
+{
+ var->name = keyname;
+ var->namelen = strlen(keyname);
+ if (strcmp(PLPKS_SED_KEY, keyname) == 0) {
+ var->name = PLPKS_SED_MANGLED_LABEL;
+ var->namelen = strlen(keyname);
+ }
+ var->policy = PLPKS_PLATVAR_POLICY;
+ var->os = PLPKS_PLATVAR_OS_COMMON;
+ var->data = NULL;
+ var->datalen = 0;
+ var->component = PLPKS_SED_COMPONENT;
+}
+
+/*
+ * Read the SED Opal key from PLPKS given the label
+ */
+int sed_read_key(char *keyname, char *key, u_int *keylen)
+{
+ struct plpks_var var;
+ struct plpks_sed_object_data *data;
+ u_int offset;
+ int ret;
+ u_int len;
+
+ plpks_init_var(&var, keyname);
+
+ ret = plpks_read_os_var(&var);
+ if (ret != 0)
+ return ret;
+
+ offset = offsetof(struct plpks_sed_object_data, key);
+ if (offset > var.datalen) {
+ kfree(var.data);
+ return -EINVAL;
+ }
+
+ data = (struct plpks_sed_object_data *)var.data;
+ len = min(be32_to_cpu(data->key_len), *keylen);
+
+ if (var.data) {
+ memcpy(key, data->key, len);
+ kfree(var.data);
+ } else
+ len = 0;
+
+ key[len] = '\0';
+ *keylen = len;
+
+ return 0;
+}
+
+/*
+ * Write the SED Opal key to PLPKS given the label
+ */
+int sed_write_key(char *keyname, char *key, u_int keylen)
+{
+ struct plpks_var var;
+ struct plpks_sed_object_data data;
+ struct plpks_var_name vname;
+
+ plpks_init_var(&var, keyname);
+
+ var.datalen = sizeof(struct plpks_sed_object_data);
+ var.data = (u8 *)&data;
+
+ /* initialize SED object */
+ data.version = PLPKS_SED_OBJECT_DATA_V0;
+ data.authority = cpu_to_be64(PLPKS_SED_AUTHORITY);
+ data.range = cpu_to_be64(PLPKS_SED_RANGE);
+ memset(&data.pad1, '\0', sizeof(data.pad1));
+ data.key_len = cpu_to_be32(keylen);
+ memcpy(data.key, (char *)key, keylen);
+
+ /*
+ * Key update requires remove first. The return value
+ * is ignored since it's okay if the key doesn't exist.
+ */
+ vname.namelen = var.namelen;
+ vname.name = var.name;
+ plpks_remove_var(var.component, var.os, vname);
+
+ return plpks_write_var(var);
+}
--
gjoyce@xxxxxxxxxxxxxxxxxx
