{"id":2175291,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2175291/?format=json","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.0/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<20251217172505.112398-7-ssrish@linux.ibm.com>","date":"2025-12-17T17:25:05","name":"[v2,6/6] docs: trusted-encryped: add PKWM as a new trust source","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"d9df95d65e9669819c7657735fb591a2558f7b65","submitter":{"id":90762,"url":"http://patchwork.ozlabs.org/api/1.0/people/90762/?format=json","name":"Srish 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","To":"linux-integrity@vger.kernel.org, keyrings@vger.kernel.org,\n linuxppc-dev@lists.ozlabs.org","Cc":"maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com,\n christophe.leroy@csgroup.eu, James.Bottomley@HansenPartnership.com,\n jarkko@kernel.org, zohar@linux.ibm.com, nayna@linux.ibm.com,\n rnsastry@linux.ibm.com, linux-kernel@vger.kernel.org,\n linux-security-module@vger.kernel.org, ssrish@linux.ibm.com","Subject":"[PATCH v2 6/6] docs: trusted-encryped: add PKWM as a new trust source","Date":"Wed, 17 Dec 2025 22:55:05 +0530","Message-ID":"<20251217172505.112398-7-ssrish@linux.ibm.com>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"<20251217172505.112398-1-ssrish@linux.ibm.com>","References":"<20251217172505.112398-1-ssrish@linux.ibm.com>","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-TM-AS-GCONF":"00","X-Proofpoint-ORIG-GUID":"ceeOyiP6uF2BvNLHd10ohXNW5vn1otzm","X-Authority-Analysis":"v=2.4 cv=CLgnnBrD c=1 sm=1 tr=0 ts=6942e78f cx=c_pps\n a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17\n a=wP3pNCr1ah4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8\n a=T8Lk_pw-g3mOOJD1yd4A:9","X-Proofpoint-GUID":"vOmHre_G-yGWxqiKVb5Ic0lRl4uaAeUZ","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjUxMjEzMDAwOSBTYWx0ZWRfX+yNIHZ5fBBmo\n DmuJLc+Fr+H4Xxc07KwI4ji8pJzhohjS3GVMuqPh/MRk2QBZ7mWVgk1vvcUmNV4guytylTcluW4\n G5WJVi8pthzWmd8EvLI+XOVHFp8zj46CuFznMz1bSfNc+XP3bVi0M7D5GJ/WLrHyLiNXZMD551y\n Mk9eY3K3D3n2WKCUDdv3juvy0mZGrEDEGxvXCgtufl3T5rWJ7rYvDPr1ho+PJnY482ZoURA+z14\n nv6kWo00MdtKX2aRKn007yd4Nk1I9xY5CGGbCUD2L6wWMGFcPrRJNPrqoZSaUuYHK6XdCmr0LSH\n EgVMRDhDi5pyQyDXwd8qe2DJq0FE0os0/K1ooa9Y4sJA9Ret5SL+9JE7GAFPckTyqkqHCe+HnAC\n 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Documentation/\nadmin-guide/kernel-parameters.txt with PowerVM Key Wrapping Module (PKWM)\nas a new trust source\n\nSigned-off-by: Nayna Jain \nSigned-off-by: Srish Srinivasan \n---\n .../admin-guide/kernel-parameters.txt | 1 +\n .../security/keys/trusted-encrypted.rst | 50 +++++++++++++++++++\n 2 files changed, 51 insertions(+)","diff":"diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt\nindex a8d0afde7f85..ccb9c2f502fb 100644\n--- a/Documentation/admin-guide/kernel-parameters.txt\n+++ b/Documentation/admin-guide/kernel-parameters.txt\n@@ -7755,6 +7755,7 @@ Kernel parameters\n \t\t\t- \"tee\"\n \t\t\t- \"caam\"\n \t\t\t- \"dcp\"\n+\t\t\t- \"pkwm\"\n \t\t\tIf not specified then it defaults to iterating through\n \t\t\tthe trust source list starting with TPM and assigns the\n \t\t\tfirst trust source as a backend which is initialized\ndiff --git a/Documentation/security/keys/trusted-encrypted.rst b/Documentation/security/keys/trusted-encrypted.rst\nindex eae6a36b1c9a..ddff7c7c2582 100644\n--- a/Documentation/security/keys/trusted-encrypted.rst\n+++ b/Documentation/security/keys/trusted-encrypted.rst\n@@ -81,6 +81,14 @@ safe.\n and the UNIQUE key. Default is to use the UNIQUE key, but selecting\n the OTP key can be done via a module parameter (dcp_use_otp_key).\n \n+ (5) PKWM (PowerVM Key Wrapping Module: IBM PowerVM + Platform KeyStore)\n+\n+ Rooted to a unique, per-LPAR key, which is derived from a system-wide,\n+ randomly generated LPAR root key. Both the per-LPAR keys and the LPAR\n+ root key are stored in hypervisor-owned secure memory at runtime,\n+ and the LPAR root key is additionally persisted in secure locations\n+ such as the processor SEEPROMs and encrypted NVRAM.\n+\n * Execution isolation\n \n (1) TPM\n@@ -102,6 +110,14 @@ safe.\n environment. Only basic blob key encryption is executed there.\n The actual key sealing/unsealing is done on main processor/kernel space.\n \n+ (5) PKWM (PowerVM Key Wrapping Module: IBM PowerVM + Platform KeyStore)\n+\n+ Fixed set of cryptographic operations done on on-chip hardware\n+ cryptographic acceleration unit NX. Keys for wrapping and unwrapping\n+ are managed by PowerVM Platform KeyStore, which stores keys in an\n+ isolated in-memory copy in secure hypervisor memory, as well as in a\n+ persistent copy in hypervisor-encrypted NVRAM.\n+\n * Optional binding to platform integrity state\n \n (1) TPM\n@@ -129,6 +145,11 @@ safe.\n Relies on Secure/Trusted boot process (called HAB by vendor) for\n platform integrity.\n \n+ (5) PKWM (PowerVM Key Wrapping Module: IBM PowerVM + Platform KeyStore)\n+\n+ Relies on secure and trusted boot process of IBM Power systems for\n+ platform integrity.\n+\n * Interfaces and APIs\n \n (1) TPM\n@@ -149,6 +170,11 @@ safe.\n Vendor-specific API that is implemented as part of the DCP crypto driver in\n ``drivers/crypto/mxs-dcp.c``.\n \n+ (5) PKWM (PowerVM Key Wrapping Module: IBM PowerVM + Platform KeyStore)\n+\n+ Platform Keystore has well documented interfaces in PAPR document.\n+ Refer to ``Documentation/arch/powerpc/papr_hcalls.rst``\n+\n * Threat model\n \n The strength and appropriateness of a particular trust source for a given\n@@ -191,6 +217,10 @@ selected trust source:\n a dedicated hardware RNG that is independent from DCP which can be enabled\n to back the kernel RNG.\n \n+ * PKWM (PowerVM Key Wrapping Module: IBM PowerVM + Platform KeyStore)\n+\n+ The normal kernel random number generator is used to generate keys.\n+\n Users may override this by specifying ``trusted.rng=kernel`` on the kernel\n command-line to override the used RNG with the kernel's random number pool.\n \n@@ -321,6 +351,26 @@ Usage::\n specific to this DCP key-blob implementation. The key length for new keys is\n always in bytes. Trusted Keys can be 32 - 128 bytes (256 - 1024 bits).\n \n+Trusted Keys usage: PKWM\n+------------------------\n+\n+Usage::\n+\n+ keyctl add trusted name \"new keylen [options]\" ring\n+ keyctl add trusted name \"load hex_blob\" ring\n+ keyctl print keyid\n+\n+ options:\n+ wrap_flags= ascii hex value of security policy requirement\n+ 0x00: no secure boot requirement (default)\n+ 0x01: require secure boot to be in either audit or\n+ enforced mode\n+ 0x02: require secure boot to be in enforced mode\n+\n+\"keyctl print\" returns an ASCII hex copy of the sealed key, which is in format\n+specific to PKWM key-blob implementation. The key length for new keys is\n+always in bytes. Trusted Keys can be 32 - 128 bytes (256 - 1024 bits).\n+\n Encrypted Keys usage\n --------------------\n \n","prefixes":["v2","6/6"]}