xref: /openbmc/linux/drivers/s390/crypto/pkey_api.c (revision efc598e6c8a93491868ef7dc7c6fd28508898af2)

// SPDX-License-Identifier: GPL-2.0
/*
 *  pkey device driver
 *
 *  Copyright IBM Corp. 2017
 *  Author(s): Harald Freudenberger
 */

#define KMSG_COMPONENT "pkey"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/kallsyms.h>
#include <linux/debugfs.h>
#include <linux/random.h>
#include <linux/cpufeature.h>
#include <asm/zcrypt.h>
#include <asm/cpacf.h>
#include <asm/pkey.h>
#include <crypto/aes.h>

#include "zcrypt_api.h"
#include "zcrypt_ccamisc.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("s390 protected key interface");

/* mask of available pckmo subfunctions, fetched once at module init */
static cpacf_mask_t pckmo_functions;

/*
 * debug feature data and functions
 */

static debug_info_t *debug_info;

#define DEBUG_DBG(...)	debug_sprintf_event(debug_info, 6, ##__VA_ARGS__)
#define DEBUG_INFO(...) debug_sprintf_event(debug_info, 5, ##__VA_ARGS__)
#define DEBUG_WARN(...) debug_sprintf_event(debug_info, 4, ##__VA_ARGS__)
#define DEBUG_ERR(...)	debug_sprintf_event(debug_info, 3, ##__VA_ARGS__)

static void __init pkey_debug_init(void)
{
	/* 5 arguments per dbf entry (including the format string ptr) */
	debug_info = debug_register("pkey", 1, 1, 5 * sizeof(long));
	debug_register_view(debug_info, &debug_sprintf_view);
	debug_set_level(debug_info, 3);
}

static void __exit pkey_debug_exit(void)
{
	debug_unregister(debug_info);
}

/* inside view of a protected key token (only type 0x00 version 0x01) */
struct protaeskeytoken {
	u8  type;     /* 0x00 for PAES specific key tokens */
	u8  res0[3];
	u8  version;  /* should be 0x01 for protected AES key token */
	u8  res1[3];
	u32 keytype;  /* key type, one of the PKEY_KEYTYPE values */
	u32 len;      /* bytes actually stored in protkey[] */
	u8  protkey[MAXPROTKEYSIZE]; /* the protected key blob */
} __packed;

/*
 * Create a protected key from a clear key value.
 */
int pkey_clr2protkey(u32 keytype,
		     const struct pkey_clrkey *clrkey,
		     struct pkey_protkey *protkey)
{
	long fc;
	int keysize;
	u8 paramblock[64];

	switch (keytype) {
	case PKEY_KEYTYPE_AES_128:
		keysize = 16;
		fc = CPACF_PCKMO_ENC_AES_128_KEY;
		break;
	case PKEY_KEYTYPE_AES_192:
		keysize = 24;
		fc = CPACF_PCKMO_ENC_AES_192_KEY;
		break;
	case PKEY_KEYTYPE_AES_256:
		keysize = 32;
		fc = CPACF_PCKMO_ENC_AES_256_KEY;
		break;
	default:
		DEBUG_ERR("%s unknown/unsupported keytype %d\n",
			  __func__, keytype);
		return -EINVAL;
	}

	/*
	 * Check if the needed pckmo subfunction is available.
	 * These subfunctions can be enabled/disabled by customers
	 * in the LPAR profile or may even change on the fly.
	 */
	if (!cpacf_test_func(&pckmo_functions, fc)) {
		DEBUG_ERR("%s pckmo functions not available\n", __func__);
		return -ENODEV;
	}

	/* prepare param block */
	memset(paramblock, 0, sizeof(paramblock));
	memcpy(paramblock, clrkey->clrkey, keysize);

	/* call the pckmo instruction */
	cpacf_pckmo(fc, paramblock);

	/* copy created protected key */
	protkey->type = keytype;
	protkey->len = keysize + 32;
	memcpy(protkey->protkey, paramblock, keysize + 32);

	return 0;
}
EXPORT_SYMBOL(pkey_clr2protkey);

/*
 * Find card and transform secure key into protected key.
 */
int pkey_skey2pkey(const struct pkey_seckey *seckey,
		   struct pkey_protkey *pkey)
{
	u16 cardnr, domain;
	int rc, verify;

	/*
	 * The cca_sec2protkey call may fail when a card has been
	 * addressed where the master key was changed after last fetch
	 * of the mkvp into the cache. Try 3 times: First witout verify
	 * then with verify and last round with verify and old master
	 * key verification pattern match not ignored.
	 */
	for (verify = 0; verify < 3; verify++) {
		rc = cca_findcard(seckey->seckey, &cardnr, &domain, verify);
		if (rc < 0)
			continue;
		if (rc > 0 && verify < 2)
			continue;
		rc = cca_sec2protkey(cardnr, domain, seckey->seckey,
				     pkey->protkey, &pkey->len, &pkey->type);
		if (rc == 0)
			break;
	}

	if (rc)
		DEBUG_DBG("%s failed rc=%d\n", __func__, rc);

	return rc;
}
EXPORT_SYMBOL(pkey_skey2pkey);

/*
 * Verify key and give back some info about the key.
 */
int pkey_verifykey(const struct pkey_seckey *seckey,
		   u16 *pcardnr, u16 *pdomain,
		   u16 *pkeysize, u32 *pattributes)
{
	struct secaeskeytoken *t = (struct secaeskeytoken *) seckey;
	u16 cardnr, domain;
	int rc;

	/* check the secure key for valid AES secure key */
	rc = cca_check_secaeskeytoken(debug_info, 3, (u8 *) seckey, 0);
	if (rc)
		goto out;
	if (pattributes)
		*pattributes = PKEY_VERIFY_ATTR_AES;
	if (pkeysize)
		*pkeysize = t->bitsize;

	/* try to find a card which can handle this key */
	rc = cca_findcard(seckey->seckey, &cardnr, &domain, 1);
	if (rc < 0)
		goto out;

	if (rc > 0) {
		/* key mkvp matches to old master key mkvp */
		DEBUG_DBG("%s secure key has old mkvp\n", __func__);
		if (pattributes)
			*pattributes |= PKEY_VERIFY_ATTR_OLD_MKVP;
		rc = 0;
	}

	if (pcardnr)
		*pcardnr = cardnr;
	if (pdomain)
		*pdomain = domain;

out:
	DEBUG_DBG("%s rc=%d\n", __func__, rc);
	return rc;
}
EXPORT_SYMBOL(pkey_verifykey);

/*
 * Generate a random protected key
 */
int pkey_genprotkey(__u32 keytype, struct pkey_protkey *protkey)
{
	struct pkey_clrkey clrkey;
	int keysize;
	int rc;

	switch (keytype) {
	case PKEY_KEYTYPE_AES_128:
		keysize = 16;
		break;
	case PKEY_KEYTYPE_AES_192:
		keysize = 24;
		break;
	case PKEY_KEYTYPE_AES_256:
		keysize = 32;
		break;
	default:
		DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
			  keytype);
		return -EINVAL;
	}

	/* generate a dummy random clear key */
	get_random_bytes(clrkey.clrkey, keysize);

	/* convert it to a dummy protected key */
	rc = pkey_clr2protkey(keytype, &clrkey, protkey);
	if (rc)
		return rc;

	/* replace the key part of the protected key with random bytes */
	get_random_bytes(protkey->protkey, keysize);

	return 0;
}
EXPORT_SYMBOL(pkey_genprotkey);

/*
 * Verify if a protected key is still valid
 */
int pkey_verifyprotkey(const struct pkey_protkey *protkey)
{
	unsigned long fc;
	struct {
		u8 iv[AES_BLOCK_SIZE];
		u8 key[MAXPROTKEYSIZE];
	} param;
	u8 null_msg[AES_BLOCK_SIZE];
	u8 dest_buf[AES_BLOCK_SIZE];
	unsigned int k;

	switch (protkey->type) {
	case PKEY_KEYTYPE_AES_128:
		fc = CPACF_KMC_PAES_128;
		break;
	case PKEY_KEYTYPE_AES_192:
		fc = CPACF_KMC_PAES_192;
		break;
	case PKEY_KEYTYPE_AES_256:
		fc = CPACF_KMC_PAES_256;
		break;
	default:
		DEBUG_ERR("%s unknown/unsupported keytype %d\n", __func__,
			  protkey->type);
		return -EINVAL;
	}

	memset(null_msg, 0, sizeof(null_msg));

	memset(param.iv, 0, sizeof(param.iv));
	memcpy(param.key, protkey->protkey, sizeof(param.key));

	k = cpacf_kmc(fc | CPACF_ENCRYPT, &param, null_msg, dest_buf,
		      sizeof(null_msg));
	if (k != sizeof(null_msg)) {
		DEBUG_ERR("%s protected key is not valid\n", __func__);
		return -EKEYREJECTED;
	}

	return 0;
}
EXPORT_SYMBOL(pkey_verifyprotkey);

/*
 * Transform a non-CCA key token into a protected key
 */
static int pkey_nonccatok2pkey(const __u8 *key, __u32 keylen,
			       struct pkey_protkey *protkey)
{
	struct keytoken_header *hdr = (struct keytoken_header *)key;
	struct protaeskeytoken *t;

	switch (hdr->version) {
	case TOKVER_PROTECTED_KEY:
		if (keylen != sizeof(struct protaeskeytoken))
			return -EINVAL;

		t = (struct protaeskeytoken *)key;
		protkey->len = t->len;
		protkey->type = t->keytype;
		memcpy(protkey->protkey, t->protkey,
		       sizeof(protkey->protkey));

		return pkey_verifyprotkey(protkey);
	default:
		DEBUG_ERR("%s unknown/unsupported non-CCA token version %d\n",
			  __func__, hdr->version);
		return -EINVAL;
	}
}

/*
 * Transform a CCA internal key token into a protected key
 */
static int pkey_ccainttok2pkey(const __u8 *key, __u32 keylen,
			       struct pkey_protkey *protkey)
{
	struct keytoken_header *hdr = (struct keytoken_header *)key;

	switch (hdr->version) {
	case TOKVER_CCA_AES:
		if (keylen != sizeof(struct secaeskeytoken))
			return -EINVAL;

		return pkey_skey2pkey((struct pkey_seckey *)key,
				      protkey);
	default:
		DEBUG_ERR("%s unknown/unsupported CCA internal token version %d\n",
			  __func__, hdr->version);
		return -EINVAL;
	}
}

/*
 * Transform a key blob (of any type) into a protected key
 */
int pkey_keyblob2pkey(const __u8 *key, __u32 keylen,
		      struct pkey_protkey *protkey)
{
	struct keytoken_header *hdr = (struct keytoken_header *)key;

	if (keylen < sizeof(struct keytoken_header))
		return -EINVAL;

	switch (hdr->type) {
	case TOKTYPE_NON_CCA:
		return pkey_nonccatok2pkey(key, keylen, protkey);
	case TOKTYPE_CCA_INTERNAL:
		return pkey_ccainttok2pkey(key, keylen, protkey);
	default:
		DEBUG_ERR("%s unknown/unsupported blob type %d\n", __func__,
			  hdr->type);
		return -EINVAL;
	}
}
EXPORT_SYMBOL(pkey_keyblob2pkey);

/*
 * File io functions
 */

static long pkey_unlocked_ioctl(struct file *filp, unsigned int cmd,
				unsigned long arg)
{
	int rc;

	switch (cmd) {
	case PKEY_GENSECK: {
		struct pkey_genseck __user *ugs = (void __user *) arg;
		struct pkey_genseck kgs;

		if (copy_from_user(&kgs, ugs, sizeof(kgs)))
			return -EFAULT;
		rc = cca_genseckey(kgs.cardnr, kgs.domain,
				   kgs.keytype, kgs.seckey.seckey);
		DEBUG_DBG("%s cca_genseckey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(ugs, &kgs, sizeof(kgs)))
			return -EFAULT;
		break;
	}
	case PKEY_CLR2SECK: {
		struct pkey_clr2seck __user *ucs = (void __user *) arg;
		struct pkey_clr2seck kcs;

		if (copy_from_user(&kcs, ucs, sizeof(kcs)))
			return -EFAULT;
		rc = cca_clr2seckey(kcs.cardnr, kcs.domain, kcs.keytype,
				    kcs.clrkey.clrkey, kcs.seckey.seckey);
		DEBUG_DBG("%s cca_clr2seckey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(ucs, &kcs, sizeof(kcs)))
			return -EFAULT;
		memzero_explicit(&kcs, sizeof(kcs));
		break;
	}
	case PKEY_SEC2PROTK: {
		struct pkey_sec2protk __user *usp = (void __user *) arg;
		struct pkey_sec2protk ksp;

		if (copy_from_user(&ksp, usp, sizeof(ksp)))
			return -EFAULT;
		rc = cca_sec2protkey(ksp.cardnr, ksp.domain,
				     ksp.seckey.seckey, ksp.protkey.protkey,
				     NULL, &ksp.protkey.type);
		DEBUG_DBG("%s cca_sec2protkey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(usp, &ksp, sizeof(ksp)))
			return -EFAULT;
		break;
	}
	case PKEY_CLR2PROTK: {
		struct pkey_clr2protk __user *ucp = (void __user *) arg;
		struct pkey_clr2protk kcp;

		if (copy_from_user(&kcp, ucp, sizeof(kcp)))
			return -EFAULT;
		rc = pkey_clr2protkey(kcp.keytype,
				      &kcp.clrkey, &kcp.protkey);
		DEBUG_DBG("%s pkey_clr2protkey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(ucp, &kcp, sizeof(kcp)))
			return -EFAULT;
		memzero_explicit(&kcp, sizeof(kcp));
		break;
	}
	case PKEY_FINDCARD: {
		struct pkey_findcard __user *ufc = (void __user *) arg;
		struct pkey_findcard kfc;

		if (copy_from_user(&kfc, ufc, sizeof(kfc)))
			return -EFAULT;
		rc = cca_findcard(kfc.seckey.seckey,
				  &kfc.cardnr, &kfc.domain, 1);
		DEBUG_DBG("%s cca_findcard()=%d\n", __func__, rc);
		if (rc < 0)
			break;
		if (copy_to_user(ufc, &kfc, sizeof(kfc)))
			return -EFAULT;
		break;
	}
	case PKEY_SKEY2PKEY: {
		struct pkey_skey2pkey __user *usp = (void __user *) arg;
		struct pkey_skey2pkey ksp;

		if (copy_from_user(&ksp, usp, sizeof(ksp)))
			return -EFAULT;
		rc = pkey_skey2pkey(&ksp.seckey, &ksp.protkey);
		DEBUG_DBG("%s pkey_skey2pkey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(usp, &ksp, sizeof(ksp)))
			return -EFAULT;
		break;
	}
	case PKEY_VERIFYKEY: {
		struct pkey_verifykey __user *uvk = (void __user *) arg;
		struct pkey_verifykey kvk;

		if (copy_from_user(&kvk, uvk, sizeof(kvk)))
			return -EFAULT;
		rc = pkey_verifykey(&kvk.seckey, &kvk.cardnr, &kvk.domain,
				    &kvk.keysize, &kvk.attributes);
		DEBUG_DBG("%s pkey_verifykey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(uvk, &kvk, sizeof(kvk)))
			return -EFAULT;
		break;
	}
	case PKEY_GENPROTK: {
		struct pkey_genprotk __user *ugp = (void __user *) arg;
		struct pkey_genprotk kgp;

		if (copy_from_user(&kgp, ugp, sizeof(kgp)))
			return -EFAULT;
		rc = pkey_genprotkey(kgp.keytype, &kgp.protkey);
		DEBUG_DBG("%s pkey_genprotkey()=%d\n", __func__, rc);
		if (rc)
			break;
		if (copy_to_user(ugp, &kgp, sizeof(kgp)))
			return -EFAULT;
		break;
	}
	case PKEY_VERIFYPROTK: {
		struct pkey_verifyprotk __user *uvp = (void __user *) arg;
		struct pkey_verifyprotk kvp;

		if (copy_from_user(&kvp, uvp, sizeof(kvp)))
			return -EFAULT;
		rc = pkey_verifyprotkey(&kvp.protkey);
		DEBUG_DBG("%s pkey_verifyprotkey()=%d\n", __func__, rc);
		break;
	}
	case PKEY_KBLOB2PROTK: {
		struct pkey_kblob2pkey __user *utp = (void __user *) arg;
		struct pkey_kblob2pkey ktp;
		__u8 __user *ukey;
		__u8 *kkey;

		if (copy_from_user(&ktp, utp, sizeof(ktp)))
			return -EFAULT;
		if (ktp.keylen < MINKEYBLOBSIZE ||
		    ktp.keylen > MAXKEYBLOBSIZE)
			return -EINVAL;
		ukey = ktp.key;
		kkey = kmalloc(ktp.keylen, GFP_KERNEL);
		if (kkey == NULL)
			return -ENOMEM;
		if (copy_from_user(kkey, ukey, ktp.keylen)) {
			kfree(kkey);
			return -EFAULT;
		}
		rc = pkey_keyblob2pkey(kkey, ktp.keylen, &ktp.protkey);
		DEBUG_DBG("%s pkey_keyblob2pkey()=%d\n", __func__, rc);
		kfree(kkey);
		if (rc)
			break;
		if (copy_to_user(utp, &ktp, sizeof(ktp)))
			return -EFAULT;
		break;
	}
	default:
		/* unknown/unsupported ioctl cmd */
		return -ENOTTY;
	}

	return rc;
}

/*
 * Sysfs and file io operations
 */

/*
 * Sysfs attribute read function for all protected key binary attributes.
 * The implementation can not deal with partial reads, because a new random
 * protected key blob is generated with each read. In case of partial reads
 * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
 */
static ssize_t pkey_protkey_aes_attr_read(u32 keytype, bool is_xts, char *buf,
					  loff_t off, size_t count)
{
	struct protaeskeytoken protkeytoken;
	struct pkey_protkey protkey;
	int rc;

	if (off != 0 || count < sizeof(protkeytoken))
		return -EINVAL;
	if (is_xts)
		if (count < 2 * sizeof(protkeytoken))
			return -EINVAL;

	memset(&protkeytoken, 0, sizeof(protkeytoken));
	protkeytoken.type = TOKTYPE_NON_CCA;
	protkeytoken.version = TOKVER_PROTECTED_KEY;
	protkeytoken.keytype = keytype;

	rc = pkey_genprotkey(protkeytoken.keytype, &protkey);
	if (rc)
		return rc;

	protkeytoken.len = protkey.len;
	memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);

	memcpy(buf, &protkeytoken, sizeof(protkeytoken));

	if (is_xts) {
		rc = pkey_genprotkey(protkeytoken.keytype, &protkey);
		if (rc)
			return rc;

		protkeytoken.len = protkey.len;
		memcpy(&protkeytoken.protkey, &protkey.protkey, protkey.len);

		memcpy(buf + sizeof(protkeytoken), &protkeytoken,
		       sizeof(protkeytoken));

		return 2 * sizeof(protkeytoken);
	}

	return sizeof(protkeytoken);
}

static ssize_t protkey_aes_128_read(struct file *filp,
				    struct kobject *kobj,
				    struct bin_attribute *attr,
				    char *buf, loff_t off,
				    size_t count)
{
	return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
					  off, count);
}

static ssize_t protkey_aes_192_read(struct file *filp,
				    struct kobject *kobj,
				    struct bin_attribute *attr,
				    char *buf, loff_t off,
				    size_t count)
{
	return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
					  off, count);
}

static ssize_t protkey_aes_256_read(struct file *filp,
				    struct kobject *kobj,
				    struct bin_attribute *attr,
				    char *buf, loff_t off,
				    size_t count)
{
	return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
					  off, count);
}

static ssize_t protkey_aes_128_xts_read(struct file *filp,
					struct kobject *kobj,
					struct bin_attribute *attr,
					char *buf, loff_t off,
					size_t count)
{
	return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
					  off, count);
}

static ssize_t protkey_aes_256_xts_read(struct file *filp,
					struct kobject *kobj,
					struct bin_attribute *attr,
					char *buf, loff_t off,
					size_t count)
{
	return pkey_protkey_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
					  off, count);
}

static BIN_ATTR_RO(protkey_aes_128, sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_192, sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_256, sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_128_xts, 2 * sizeof(struct protaeskeytoken));
static BIN_ATTR_RO(protkey_aes_256_xts, 2 * sizeof(struct protaeskeytoken));

static struct bin_attribute *protkey_attrs[] = {
	&bin_attr_protkey_aes_128,
	&bin_attr_protkey_aes_192,
	&bin_attr_protkey_aes_256,
	&bin_attr_protkey_aes_128_xts,
	&bin_attr_protkey_aes_256_xts,
	NULL
};

static struct attribute_group protkey_attr_group = {
	.name	   = "protkey",
	.bin_attrs = protkey_attrs,
};

/*
 * Sysfs attribute read function for all secure key ccadata binary attributes.
 * The implementation can not deal with partial reads, because a new random
 * protected key blob is generated with each read. In case of partial reads
 * (i.e. off != 0 or count < key blob size) -EINVAL is returned.
 */
static ssize_t pkey_ccadata_aes_attr_read(u32 keytype, bool is_xts, char *buf,
					  loff_t off, size_t count)
{
	int rc;
	struct pkey_seckey *seckey = (struct pkey_seckey *) buf;

	if (off != 0 || count < sizeof(struct secaeskeytoken))
		return -EINVAL;
	if (is_xts)
		if (count < 2 * sizeof(struct secaeskeytoken))
			return -EINVAL;

	rc = cca_genseckey(-1, -1, keytype, seckey->seckey);
	if (rc)
		return rc;

	if (is_xts) {
		seckey++;
		rc = cca_genseckey(-1, -1, keytype, seckey->seckey);
		if (rc)
			return rc;

		return 2 * sizeof(struct secaeskeytoken);
	}

	return sizeof(struct secaeskeytoken);
}

static ssize_t ccadata_aes_128_read(struct file *filp,
				    struct kobject *kobj,
				    struct bin_attribute *attr,
				    char *buf, loff_t off,
				    size_t count)
{
	return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, false, buf,
					  off, count);
}

static ssize_t ccadata_aes_192_read(struct file *filp,
				    struct kobject *kobj,
				    struct bin_attribute *attr,
				    char *buf, loff_t off,
				    size_t count)
{
	return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_192, false, buf,
					  off, count);
}

static ssize_t ccadata_aes_256_read(struct file *filp,
				    struct kobject *kobj,
				    struct bin_attribute *attr,
				    char *buf, loff_t off,
				    size_t count)
{
	return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, false, buf,
					  off, count);
}

static ssize_t ccadata_aes_128_xts_read(struct file *filp,
					struct kobject *kobj,
					struct bin_attribute *attr,
					char *buf, loff_t off,
					size_t count)
{
	return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_128, true, buf,
					  off, count);
}

static ssize_t ccadata_aes_256_xts_read(struct file *filp,
					struct kobject *kobj,
					struct bin_attribute *attr,
					char *buf, loff_t off,
					size_t count)
{
	return pkey_ccadata_aes_attr_read(PKEY_KEYTYPE_AES_256, true, buf,
					  off, count);
}

static BIN_ATTR_RO(ccadata_aes_128, sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_192, sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_256, sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_128_xts, 2 * sizeof(struct secaeskeytoken));
static BIN_ATTR_RO(ccadata_aes_256_xts, 2 * sizeof(struct secaeskeytoken));

static struct bin_attribute *ccadata_attrs[] = {
	&bin_attr_ccadata_aes_128,
	&bin_attr_ccadata_aes_192,
	&bin_attr_ccadata_aes_256,
	&bin_attr_ccadata_aes_128_xts,
	&bin_attr_ccadata_aes_256_xts,
	NULL
};

static struct attribute_group ccadata_attr_group = {
	.name	   = "ccadata",
	.bin_attrs = ccadata_attrs,
};

static const struct attribute_group *pkey_attr_groups[] = {
	&protkey_attr_group,
	&ccadata_attr_group,
	NULL,
};

static const struct file_operations pkey_fops = {
	.owner		= THIS_MODULE,
	.open		= nonseekable_open,
	.llseek		= no_llseek,
	.unlocked_ioctl = pkey_unlocked_ioctl,
};

static struct miscdevice pkey_dev = {
	.name	= "pkey",
	.minor	= MISC_DYNAMIC_MINOR,
	.mode	= 0666,
	.fops	= &pkey_fops,
	.groups = pkey_attr_groups,
};

/*
 * Module init
 */
static int __init pkey_init(void)
{
	cpacf_mask_t kmc_functions;

	/*
	 * The pckmo instruction should be available - even if we don't
	 * actually invoke it. This instruction comes with MSA 3 which
	 * is also the minimum level for the kmc instructions which
	 * are able to work with protected keys.
	 */
	if (!cpacf_query(CPACF_PCKMO, &pckmo_functions))
		return -ENODEV;

	/* check for kmc instructions available */
	if (!cpacf_query(CPACF_KMC, &kmc_functions))
		return -ENODEV;
	if (!cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
	    !cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
	    !cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256))
		return -ENODEV;

	pkey_debug_init();

	return misc_register(&pkey_dev);
}

/*
 * Module exit
 */
static void __exit pkey_exit(void)
{
	misc_deregister(&pkey_dev);
	pkey_debug_exit();
}

module_cpu_feature_match(MSA, pkey_init);
module_exit(pkey_exit);