From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by smtp.subspace.kernel.org (Postfix) with ESMTPS id 448A9351C3B;
	Thu, 27 Aug 2026 06:25:38 +0000 (UTC)
Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1
ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;
	t=1787811940; cv=none; b=C/QCzC7dsZKouCglK3bJQfh7q0CGSsm+meVtMzMWt/PKxaI65x4T9qUUxVH2ZaLANU4BaGrTr+miygLwDReBEvRHbhv6I7iDtxouGt7mgqjZTVExpihiIBFoQ9S0QUGHoI7v+Y9SF+N0gQYCQwv3ufi4FofKijpjC1OXFRgokcc=
ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org;
	s=arc-20240116; t=1787811940; c=relaxed/simple;
	bh=GnmLu7YMeQRiC5xtBFbqInbE2DRNeuRqMOiBzbuxJSo=;
	h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:
	 MIME-Version; b=iuNr0k1Ah2ipTFO4HMmgmBNb2c9eb76EHjitNezLVNG/UPhNDr17KY44IZha6XaqjlZZplSyhDjjTI2fR82ZJdzrFHYYB8D3WsaAc1H2aQPy6AnfXJuC17SEeBQnXeqQlAnHCzoe0Hy5enbLDwrqTohp6X8tP1hWQGKF46N3DNg=
ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=HOp2l4BR; arc=none smtp.client-ip=148.163.156.1
Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com
Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com
Authentication-Results: smtp.subspace.kernel.org;
	dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="HOp2l4BR"
Received: from pps.filterd (m0356517.ppops.net [127.0.0.1])
	by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 67R3VVIW1823404;
	Thu, 27 Aug 2026 06:25:23 GMT
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc
	:content-transfer-encoding:date:from:in-reply-to:message-id
	:mime-version:references:subject:to; s=pp1; bh=X2yKp8KODl7jyBAVu
	L3HGsUW2Jbd4ijTx73X1Vy2WAA=; b=HOp2l4BRHPn/sJsNsec/sVHdwWsFNhgXK
	n81NmS9ZI0P7Fpci5xeNPGwmcZl0cqi0Vk7z5iqnlVq3LH0svBjDrlcTMDJQd+XX
	HECijYN4RxRtvId9t0srDt87qCa8ehldXXlv0Aef/dyMVtB0DzIX0dRTujxcyvPM
	XBoPtrPWLV2cjvZ+ixruC0fAy7GlqukBOt9lVUu00UvYrd9o/1j12jKm5nZcb/Od
	bwRQex8NEGN6DR41JsmzQ5cFLQdCxVDtt/pREM/i5bqoxX3KWBZkx0uyI/heCl9l
	dzXu8yHqImhuHn9NcK7P9cX7+ynwdc4GdIGkgyMRx8BmRpYOSI5Ww==
Received: from ppma12.dal12v.mail.ibm.com (dc.9e.1632.ip4.static.sl-reverse.com [50.22.158.220])
	by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4g73g53n32-1
	(version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
	Thu, 27 Aug 2026 06:25:22 +0000 (GMT)
Received: from pps.filterd (ppma12.dal12v.mail.ibm.com [127.0.0.1])
	by ppma12.dal12v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 67R6BFk2000452;
	Thu, 27 Aug 2026 06:25:21 GMT
Received: from smtprelay03.fra02v.mail.ibm.com ([9.218.2.224])
	by ppma12.dal12v.mail.ibm.com (PPS) with ESMTPS id 4g7p3qeq88-1
	(version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT);
	Thu, 27 Aug 2026 06:25:21 +0000 (GMT)
Received: from smtpav01.fra02v.mail.ibm.com (smtpav01.fra02v.mail.ibm.com [10.20.54.100])
	by smtprelay03.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 67R6PIOj32440780
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK);
	Thu, 27 Aug 2026 06:25:18 GMT
Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1])
	by IMSVA (Postfix) with ESMTP id E891920040;
	Thu, 27 Aug 2026 06:25:17 +0000 (GMT)
Received: from smtpav01.fra02v.mail.ibm.com (unknown [127.0.0.1])
	by IMSVA (Postfix) with ESMTP id CAFAB20043;
	Thu, 27 Aug 2026 06:25:01 +0000 (GMT)
Received: from li-fc74f8cc-3279-11b2-a85c-ef5828687581.ibm.com.com (unknown [9.76.202.253])
	by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP;
	Thu, 27 Aug 2026 06:25:01 +0000 (GMT)
From: Srish Srinivasan <ssrish@linux.ibm.com>
To: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org
Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com,
        christophe.leroy@csgroup.eu, James.Bottomley@HansenPartnership.com,
        jarkko@kernel.org, zohar@linux.ibm.com, linux-kernel@vger.kernel.org,
        linux-security-module@vger.kernel.org, nayna@linux.ibm.com,
        rnsastry@linux.ibm.com, ssrish@linux.ibm.com
Subject: [PATCH 8/8] pseries/plpks/wrapkey: expose PKWM wrapping key management to userspace via sysfs
Date: Thu, 27 Aug 2026 11:53:08 +0530
Message-ID: <20260827062309.724808-9-ssrish@linux.ibm.com>
X-Mailer: git-send-email 2.55.0
In-Reply-To: <20260827062309.724808-1-ssrish@linux.ibm.com>
References: <20260827062309.724808-1-ssrish@linux.ibm.com>
Precedence: bulk
X-Mailing-List: linux-kernel@vger.kernel.org
List-Id: <linux-kernel.vger.kernel.org>
List-Subscribe: <mailto:linux-kernel+subscribe@vger.kernel.org>
List-Unsubscribe: <mailto:linux-kernel+unsubscribe@vger.kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-TM-AS-GCONF: 00
X-Proofpoint-Reinject: loops=2 maxloops=12
X-Proofpoint-ORIG-GUID: 9h3Hccq7bhrOmIQ0gtJwST0LtE5Lz8Kc
X-Proofpoint-Spam-Info: AW1haW4tMjYwODI3MDA0OCBTYWx0ZWRfX4WsaghuumOI0
 o6fHYgxAbMEYvUH0K05pXLJu1lzHyw4B8DOE0cE5WFyAwP3on9pTjM/CaKZM4+Qne5HJ34lsYnC
 c738fDVsLAvSRSosmnMd9w2Z6t9UkJo=
X-Proofpoint-GUID: NU4h1gJS27UmDOdgHJilV3B0QMRBneKz
X-Authority-Analysis: v=2.4 cv=JZyMa0KV c=1 sm=1 tr=0 ts=6a8fd853 cx=c_pps
 a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17
 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22
 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=Dm_dBKYgswZ8qGTShzQA:9
X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI3MDA0OCBTYWx0ZWRfX/xl5Z+jfN8lK
 Dk5iNH0iOG0CzI/vZREIbyy46qcxB/QsXkSKK6gkUAEl2eay9nq3Yv5YicvjYnp7Ze0apD+DR9z
 KuZDBPSVW33vPcUiJJ04RYWw7LcKKwuOP1tUfBsakfoR/iG3qqKBG2VBhF4j6wLUz69vlccGJ9x
 dqDg4PngYWwrleIQ/RFEdIMhF9g000cq1nyjNUSyPXB/zBsxJSlvIImA/fDILfHE2jFmEomGBWK
 eY4mWJGZbv5NHtRssexBnVh8NjaG+1Sh+HoDAaldvKfiQriOmAGCiGzbcJsHpSm1PAjWrJtayRo
 srSX/RxOKOTFI+5eChVZdvWKJrLX3pH6vtmBM5t2tgZ45Cpw0h22YbAuzbYkva6BsMlWD22G9Py
 9OXqOZp4LJu4cX4uXaGuBDMhxi9pGVv1TurYiTiCA4ZXf1pBpg3XQIbkS4DT6rHmKHrCGqhV6qY
 VE9nndGPlEDnfO/hqiQ==
X-Proofpoint-Virus-Version: vendor=baseguard
 engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49
 definitions=2026-08-27_02,2026-08-26_02,2025-10-01_01
X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0
 spamscore=0 clxscore=1015 adultscore=0 priorityscore=1501 impostorscore=0
 malwarescore=0 bulkscore=0 lowpriorityscore=0 suspectscore=0 phishscore=0
 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0
 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608270048

The PKWM trusted source currently uses a single default wrapping key
created during initialization. However, PKWM also supports user-created
wrapping keys for better isolation between trusted keys.

Expose wrapping key lifecycle operations through sysfs to allow users to
create and manage their own wrapping keys.

Create a sysfs interface at /sys/firmware/plpks/wrapkey with the following
attributes:

  create        - Create a new wrapping key with a user-provided label
  delete        - Delete a revoked wrapping key by label
  revoke        - Revoke a wrapping key by label
  unrevoke      - Unrevoke a previously revoked wrapping key by label
  list_active   - List labels of all active (non-revoked) wrapping keys
  list_revoked  - List labels of all revoked wrapping keys

User-provided labels are validated to contain only alphanumeric characters.

Wrapping key lifecycle constraints:
- A wrapping key must be revoked before it can be deleted
- Revoked wrapping keys cannot be used for wrap operations until unrevoked
- The default wrapping key cannot be revoked or deleted; it always appears
  in list_active

The wrapping keys themselves are confidential objects stored in PLPKS. Only
the user-provided labels are exposed to userspace for identification and
management purposes.

These user-created wrapping keys can be used in seal/unseal operations via
the wrapping_key=<label> option.

Signed-off-by: Srish Srinivasan <ssrish@linux.ibm.com>
---
 .../ABI/testing/sysfs-firmware-plpks          | 106 +++++
 arch/powerpc/include/asm/plpks.h              |   9 +
 arch/powerpc/platforms/pseries/Kconfig        |  13 +
 arch/powerpc/platforms/pseries/Makefile       |   1 +
 arch/powerpc/platforms/pseries/plpks-sysfs.c  |  11 +
 .../platforms/pseries/plpks-wrapkey-sysfs.c   | 407 ++++++++++++++++++
 arch/powerpc/platforms/pseries/plpks.c        |   1 -
 7 files changed, 547 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/platforms/pseries/plpks-wrapkey-sysfs.c

diff --git a/Documentation/ABI/testing/sysfs-firmware-plpks b/Documentation/ABI/testing/sysfs-firmware-plpks
index cba061e4eee2..ebcdef17a8a8 100644
--- a/Documentation/ABI/testing/sysfs-firmware-plpks
+++ b/Documentation/ABI/testing/sysfs-firmware-plpks
@@ -56,3 +56,109 @@ Description:	Bitmask of the wrapping features indicating the wrapping
 		algorithms that are supported for the H_PKS_WRAP_OBJECT requests
 		, represented as a 8 byte hexadecimal ASCII string. Consult the
 		hypervisor documentation for what these flags mean.
+
+What:		/sys/firmware/plpks/wrapkey
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	This directory provides the interface for creating and managing
+		user-created PKWM wrapping keys.
+
+		The directory is present only when CONFIG_PLPKS_WRAPKEY_SYSFS is
+		enabled and the system supports the H_PKS_{UN}REVOKE_OBJECT
+		interfaces.
+
+		Only alphanumeric characters are accepted in wrapping key
+		labels. The wrapping keys themselves are confidential PLPKS
+		objects and are not exposed to userspace. Only their labels are
+		exposed for identification and management.
+
+		Each write is processed as an independent operation and accepts
+		exactly one wrapping key label. The resulting state can be
+		verified through list_active or list_revoked, as appropriate.
+
+		The default wrapping key cannot be revoked or deleted.
+
+What:		/sys/firmware/plpks/wrapkey/create
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	(WO) Create a wrapping key with the specified label.
+
+		On success, the label appears in list_active.
+
+		For example, to create a wrapping key labelled "wk1":
+
+			echo -n wk1 > /sys/firmware/plpks/wrapkey/create
+
+		or:
+
+			printf '%s' 'wk1' > /sys/firmware/plpks/wrapkey/create
+
+What:		/sys/firmware/plpks/wrapkey/delete
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	(WO) Delete a revoked wrapping key identified by the specified
+		label. A wrapping key must be revoked before it can be deleted.
+
+		On success, the label no longer appears in list_revoked.
+
+		For example, to delete a revoked wrapping key labelled "wk1":
+
+			echo -n wk1 > /sys/firmware/plpks/wrapkey/delete
+
+		or:
+
+			printf '%s' 'wk1' > /sys/firmware/plpks/wrapkey/delete
+
+What:		/sys/firmware/plpks/wrapkey/revoke
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	(WO) Revoke a wrapping key identified by the specified label. A
+		revoked wrapping key cannot be used for seal or unseal
+		operations until it is unrevoked.
+
+		On success, the label appears in list_revoked and no longer
+		appears in list_active.
+
+		For example, to revoke a wrapping key labelled "wk1":
+
+			echo -n wk1 > /sys/firmware/plpks/wrapkey/revoke
+
+		or:
+
+			printf '%s' 'wk1' > /sys/firmware/plpks/wrapkey/revoke
+
+What:		/sys/firmware/plpks/wrapkey/unrevoke
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	(WO) Unrevoke a revoked wrapping key identified by the specified
+		label.
+
+		On success, the label appears in list_active and no longer
+		appears in list_revoked.
+
+		For example, to unrevoke a revoked wrapping key labelled "wk1":
+
+			echo -n wk1 > /sys/firmware/plpks/wrapkey/unrevoke
+
+		or:
+
+			printf '%s' 'wk1' > /sys/firmware/plpks/wrapkey/unrevoke
+
+What:		/sys/firmware/plpks/wrapkey/list_active
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	(RO) List the labels of active, non-revoked wrapping keys. The
+		default wrapping key is always included in this list.
+
+		For example:
+
+			cat /sys/firmware/plpks/wrapkey/list_active
+
+What:		/sys/firmware/plpks/wrapkey/list_revoked
+Date:		August 2026
+Contact:	Srish Srinivasan <ssrish@linux.ibm.com>
+Description:	(RO) List the labels of revoked wrapping keys.
+
+		For example:
+
+			cat /sys/firmware/plpks/wrapkey/list_revoked
diff --git a/arch/powerpc/include/asm/plpks.h b/arch/powerpc/include/asm/plpks.h
index badb07afe749..420945aeeb0e 100644
--- a/arch/powerpc/include/asm/plpks.h
+++ b/arch/powerpc/include/asm/plpks.h
@@ -56,6 +56,8 @@
 // Component for a PKWM wrapping key
 #define PLPKS_WRAPKEY_COMPONENT	"PLPKSWR"
 
+#define PLPKS_OBJLABEL_LEN_FIELD_SIZE	2
+
 struct plpks_var {
 	char *component;
 	u8 *name;
@@ -144,6 +146,9 @@ int plpks_get_object_labels(u8 **output_buf, u64 *output_len,
 
 bool plpks_revoke_is_supported(void);
 
+int plpks_init_child_kobj(struct kobject *kobj, const struct kobj_type *ktype,
+			  const char *name);
+
 #else // CONFIG_PSERIES_PLPKS
 static inline bool plpks_is_available(void) { return false; }
 static inline u16 plpks_get_passwordlen(void) { BUILD_BUG(); }
@@ -151,6 +156,10 @@ static inline void plpks_early_init_devtree(void) { }
 static inline int plpks_populate_fdt(void *fdt) { BUILD_BUG(); }
 static inline int plpks_config_create_softlink(struct kobject *from)
 						{ return 0; }
+static inline int plpks_init_child_kobj(struct kobject *kobj,
+					const struct kobj_type *ktype,
+					const char *name)
+						{ return 0; }
 #endif // CONFIG_PSERIES_PLPKS
 
 #endif // _ASM_POWERPC_PLPKS_H
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index 74910ce3a541..77afd9fd6c90 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -216,3 +216,16 @@ config PPC_SVM
 	 those guests.
 
 	 If unsure, say "N".
+
+config PLPKS_WRAPKEY_SYSFS
+	bool "Enable sysfs based user interface for managing PKWM wrapping keys"
+	default n
+	depends on PSERIES_PLPKS
+	depends on SYSFS
+	depends on TRUSTED_KEYS_PKWM
+	help
+	  The PKWM trusted source has support for user-created wrapping keys
+	  that are managed and controlled by OS. These wrapping keys can be
+	  created, revoked, unrevoked, deleted, and their labels can be viewed
+	  via the sysfs. Say Y if you have PLPKS enabled and want to setup PKWM
+	  as the trusted source.
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 3ced289a675b..c604be40f546 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_FA_DUMP)		+= rtas-fadump.o
 obj-$(CONFIG_PSERIES_PLPKS)	+= plpks.o plpks-sysfs.o
 obj-$(CONFIG_PPC_SECURE_BOOT)	+= plpks-secvar.o
 obj-$(CONFIG_PSERIES_PLPKS_SED)	+= plpks_sed_ops.o
+obj-$(CONFIG_PLPKS_WRAPKEY_SYSFS) += plpks-wrapkey-sysfs.o
 obj-$(CONFIG_SUSPEND)		+= suspend.o
 obj-$(CONFIG_PPC_VAS)		+= vas.o vas-sysfs.o
 
diff --git a/arch/powerpc/platforms/pseries/plpks-sysfs.c b/arch/powerpc/platforms/pseries/plpks-sysfs.c
index f2436229f323..0ca13bb6405f 100644
--- a/arch/powerpc/platforms/pseries/plpks-sysfs.c
+++ b/arch/powerpc/platforms/pseries/plpks-sysfs.c
@@ -55,6 +55,17 @@ static umode_t plpks_config_attr_is_visible(struct kobject *kobj,
 	return attr->mode;
 }
 
+int plpks_init_child_kobj(struct kobject *kobj, const struct kobj_type *ktype,
+			  const char *name)
+{
+	kobject_init(kobj, ktype);
+
+	if (!plpks_kobj)
+		return -ENODEV;
+
+	return kobject_add(kobj, plpks_kobj, "%s", name);
+}
+
 int plpks_config_create_softlink(struct kobject *from)
 {
 	if (!plpks_config_kobj)
diff --git a/arch/powerpc/platforms/pseries/plpks-wrapkey-sysfs.c b/arch/powerpc/platforms/pseries/plpks-wrapkey-sysfs.c
new file mode 100644
index 000000000000..7493d3f58546
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/plpks-wrapkey-sysfs.c
@@ -0,0 +1,407 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2025 IBM Corporation <ssrish@linux.ibm.com>
+ *
+ * This code exposes wrapping key management options to the user via the
+ * sysfs
+ */
+
+#define pr_fmt(fmt) "wrapkey-sysfs: " fmt
+#define PLPKS_WRAPKEY_REVOKED 1
+#define PLPKS_WRAPKEY_UNREVOKED 0
+
+#include <linux/slab.h>
+#include <linux/compat.h>
+#include <linux/string.h>
+#include <linux/of.h>
+#include <linux/ctype.h>
+#include <linux/unaligned.h>
+#include <asm/plpks.h>
+
+static struct kobject *wrapkey_kobj;
+
+static bool is_wrapkey_label_alnum(const char *key_label, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		if (!isalnum((unsigned char)key_label[i])) {
+			pr_err("key label <%*pE> is not alphanumeric\n",
+			       (int)len, key_label);
+			return false;
+		}
+	}
+
+	return true;
+}
+
+static ssize_t list_key_labels(char *buf, u8 *obj_labels_buf,
+			       u64 obj_labels_count, int revoked)
+{
+	struct plpks_var var = {0};
+	u8 *obj_labels_buf_ptr, *comp_prefix;
+	u8 *key_label_ptr;
+	u16 obj_label_len;
+	int len = 0;
+	int is_revoked;
+	u64 i;
+
+	var.os = PLPKS_VAR_LINUX;
+	var.component = PLPKS_WRAPKEY_COMPONENT;
+	obj_labels_buf_ptr = obj_labels_buf;
+
+	for (i = 0; i < obj_labels_count; ++i) {
+		obj_label_len = get_unaligned_be16(obj_labels_buf_ptr);
+		comp_prefix = obj_labels_buf_ptr +
+			      PLPKS_OBJLABEL_LEN_FIELD_SIZE;
+
+		var.namelen = obj_label_len - PLPKS_MAX_LABEL_ATTR_SIZE;
+		var.name = kzalloc(var.namelen + 1, GFP_KERNEL);
+
+		if (!var.name)
+			return -ENOMEM;
+
+		key_label_ptr = comp_prefix + PLPKS_MAX_LABEL_ATTR_SIZE;
+		memcpy(var.name, key_label_ptr, var.namelen);
+
+		is_revoked = plpks_is_wrapping_key_revoked(&var);
+		if (is_revoked == revoked)
+			len += sysfs_emit_at(buf, len, "<%s>\n",
+					     (char *)var.name);
+		else if (is_revoked < 0)
+			pr_warn("Failed to get revocation status for <%s>\n",
+				(char *)var.name);
+
+		kfree(var.name);
+		obj_labels_buf_ptr = key_label_ptr + var.namelen;
+	}
+
+	return len;
+}
+
+static ssize_t list_active_show(struct kobject *kobj,
+				struct kobj_attribute *attr, char *buf)
+{
+	u8 *obj_labels_buf;
+	u64 obj_labels_count = 0;
+	int rc;
+
+	rc = plpks_get_object_labels(&obj_labels_buf, &obj_labels_count,
+				     PLPKS_WRAPKEY_COMPONENT);
+	if (rc) {
+		pr_err("Retrieving object labels failed. rc=%d\n", rc);
+		goto out;
+	}
+
+	rc = list_key_labels(buf, obj_labels_buf, obj_labels_count,
+			     PLPKS_WRAPKEY_UNREVOKED);
+
+out:
+	kfree(obj_labels_buf);
+	return rc;
+}
+
+static ssize_t list_revoked_show(struct kobject *kobj,
+				 struct kobj_attribute *attr, char *buf)
+{
+	u8 *obj_labels_buf;
+	u64 obj_labels_count = 0;
+	int rc;
+
+	rc = plpks_get_object_labels(&obj_labels_buf, &obj_labels_count,
+				     PLPKS_WRAPKEY_COMPONENT);
+	if (rc) {
+		pr_err("Retrieving object labels failed. rc=%d\n", rc);
+		goto out;
+	}
+
+	rc = list_key_labels(buf, obj_labels_buf, obj_labels_count,
+			     PLPKS_WRAPKEY_REVOKED);
+
+out:
+	kfree(obj_labels_buf);
+	return rc;
+}
+
+static ssize_t create_store(struct kobject *kobj, struct kobj_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct plpks_var var = {0};
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!count) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (count > PLPKS_MAX_NAME_SIZE) {
+		rc = -ENAMETOOLONG;
+		goto out;
+	}
+
+	if (!strcmp(buf, PLPKS_DEFAULT_WRAPKEY_LABEL)) {
+		pr_warn("<%s> creation is restricted to pkwm init\n",
+			PLPKS_DEFAULT_WRAPKEY_LABEL);
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!is_wrapkey_label_alnum(buf, count)) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	var.name = kstrndup(buf, count, GFP_KERNEL);
+	if (!var.name) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	var.namelen = count;
+	var.policy = PLPKS_WRAPPINGKEY;
+	var.os = PLPKS_VAR_LINUX;
+	var.component = PLPKS_WRAPKEY_COMPONENT;
+
+	rc = plpks_gen_wrapping_key(&var);
+	if (rc) {
+		pr_err("creation of wrapping key <%s> failed. rc = %d\n",
+		       (char *)var.name, rc);
+		goto out;
+	}
+
+	rc = count;
+out:
+	kfree(var.name);
+	return rc;
+}
+
+static ssize_t revoke_store(struct kobject *kobj, struct kobj_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct plpks_var var = {0};
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!count) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (count > PLPKS_MAX_NAME_SIZE) {
+		rc = -ENAMETOOLONG;
+		goto out;
+	}
+
+	if (!strcmp(buf, PLPKS_DEFAULT_WRAPKEY_LABEL)) {
+		pr_warn("<%s> must not be revoked\n",
+			PLPKS_DEFAULT_WRAPKEY_LABEL);
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!is_wrapkey_label_alnum(buf, count)) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	var.name = kstrndup(buf, count, GFP_KERNEL);
+	if (!var.name) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	var.namelen = count;
+	var.os = PLPKS_VAR_LINUX;
+	var.component = PLPKS_WRAPKEY_COMPONENT;
+
+	rc = plpks_revoke_wrapping_key(&var);
+
+	if (rc) {
+		pr_err("revocation of wrapping key <%s> failed. rc = %d\n",
+		       (char *)var.name, rc);
+		goto out;
+	}
+
+	rc = count;
+out:
+	kfree(var.name);
+	return rc;
+}
+
+static ssize_t unrevoke_store(struct kobject *kobj, struct kobj_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct plpks_var var = {0};
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!count) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (count > PLPKS_MAX_NAME_SIZE) {
+		rc = -ENAMETOOLONG;
+		goto out;
+	}
+
+	if (!strcmp(buf, PLPKS_DEFAULT_WRAPKEY_LABEL)) {
+		pr_warn("unrevoke on <%s> is invalid\n",
+			PLPKS_DEFAULT_WRAPKEY_LABEL);
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (!is_wrapkey_label_alnum(buf, count)) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	var.name = kstrndup(buf, count, GFP_KERNEL);
+	if (!var.name) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	var.namelen = count;
+	var.os = PLPKS_VAR_LINUX;
+	var.component = PLPKS_WRAPKEY_COMPONENT;
+
+	rc = plpks_unrevoke_wrapping_key(&var);
+
+	if (rc) {
+		pr_err("un-revocation of wrapping key <%s> failed. rc = %d\n",
+		       (char *)var.name, rc);
+		goto out;
+	}
+
+	rc = count;
+out:
+	kfree(var.name);
+	return rc;
+}
+
+static ssize_t delete_store(struct kobject *kobj, struct kobj_attribute *attr,
+			    const char *buf, size_t count)
+{
+	struct plpks_var var = {0};
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN)) {
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!count) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	if (count > PLPKS_MAX_NAME_SIZE) {
+		rc = -ENAMETOOLONG;
+		goto out;
+	}
+
+	if (!strcmp(buf, PLPKS_DEFAULT_WRAPKEY_LABEL)) {
+		pr_warn("<%s> must not be deleted\n",
+			PLPKS_DEFAULT_WRAPKEY_LABEL);
+		rc = -EPERM;
+		goto out;
+	}
+
+	if (!is_wrapkey_label_alnum(buf, count)) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	var.name = kstrndup(buf, count, GFP_KERNEL);
+	if (!var.name) {
+		rc = -ENOMEM;
+		goto out;
+	}
+
+	var.namelen = count;
+	var.os = PLPKS_VAR_LINUX;
+	var.component = PLPKS_WRAPKEY_COMPONENT;
+
+	rc = plpks_del_wrapping_key(&var);
+
+	if (rc) {
+		pr_err("deletion of wrapping key <%s> failed. rc = %d\n",
+		       (char *)var.name, rc);
+		goto out;
+	}
+
+	rc = count;
+out:
+	kfree(var.name);
+	return rc;
+}
+
+static struct kobj_attribute view_active_attr = __ATTR_RO(list_active);
+
+static struct kobj_attribute view_revoked_attr = __ATTR_RO(list_revoked);
+
+static struct kobj_attribute create_attr = __ATTR_WO(create);
+
+static struct kobj_attribute revoke_attr = __ATTR_WO(revoke);
+
+static struct kobj_attribute unrevoke_attr = __ATTR_WO(unrevoke);
+
+static struct kobj_attribute delete_attr = __ATTR_WO(delete);
+
+static struct attribute *wrapkey_attrs[] = {
+	&view_active_attr.attr,
+	&view_revoked_attr.attr,
+	&create_attr.attr,
+	&revoke_attr.attr,
+	&unrevoke_attr.attr,
+	&delete_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group wrapkey_attr_group = {
+	.attrs = wrapkey_attrs,
+};
+__ATTRIBUTE_GROUPS(wrapkey_attr);
+
+static const struct kobj_type wrapkey_ktype = {
+	.sysfs_ops	= &kobj_sysfs_ops,
+	.default_groups = wrapkey_attr_groups,
+};
+
+static __init int wrapkey_sysfs_init(void)
+{
+	int rc;
+
+	if (!plpks_revoke_is_supported()) {
+		pr_err("H_PKS_{UN}REVOKE_OBJECT interface not supported\n");
+		return -ENODEV;
+	}
+
+	wrapkey_kobj = kzalloc_obj(*wrapkey_kobj);
+	if (!wrapkey_kobj)
+		return -ENOMEM;
+
+	rc = plpks_init_child_kobj(wrapkey_kobj, &wrapkey_ktype, "wrapkey");
+
+	if (rc)
+		kobject_put(wrapkey_kobj);
+
+	return rc;
+}
+
+late_initcall(wrapkey_sysfs_init);
diff --git a/arch/powerpc/platforms/pseries/plpks.c b/arch/powerpc/platforms/pseries/plpks.c
index f8c263e29bb6..7edeca7eee62 100644
--- a/arch/powerpc/platforms/pseries/plpks.c
+++ b/arch/powerpc/platforms/pseries/plpks.c
@@ -25,7 +25,6 @@
  */
 #define PLPKS_OBJLABEL_BUF_MAX	2550
 
-#define PLPKS_OBJLABEL_LEN_FIELD_SIZE	2
 #define PLPKS_OBJLABEL_PREFIX_LEN	8
 
 #define PLPKS_WRAP_INTERFACE_BIT	3
-- 
2.52.0