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Wed, 17 Jun 2026 09:48:24 +0000 (GMT) Received: from funtu2.ehn-de.ibm.com (unknown [9.224.92.54]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 17 Jun 2026 09:48:24 +0000 (GMT) From: Harald Freudenberger To: richard.henderson@linaro.org, iii@linux.ibm.com, david@kernel.org, thuth@redhat.com, berrange@redhat.com Cc: qemu-s390x@nongnu.org, qemu-devel@nongnu.org, linux390-list@tuxmaker.boeblingen.de.ibm.com, linux-s390@vger.kernel.org, dengler@linux.ibm.com, borntraeger@linux.ibm.com, fcallies@linux.ibm.com, cohuck@redhat.com Subject: [PATCH v7 15/17] docs/s390: Document CPACF instructions support Date: Wed, 17 Jun 2026 11:48:18 +0200 Message-ID: <20260617094820.34402-16-freude@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260617094820.34402-1-freude@linux.ibm.com> References: <20260617094820.34402-1-freude@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=OcSoyBTY c=1 sm=1 tr=0 ts=6a326d6c cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=yFZ0Su8qAlDFIkEhSqQA:9 a=5wi_FRADO1KgGG3s:21 a=O8hF6Hzn-FEA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE3MDA5MiBTYWx0ZWRfX0QC0dd0Lq6q0 e1ppgAnRcldp4AbSRbiDmuwstsSR1TkrT0ShshIe/3d2f1cGK1DztySTdILfCgnecKTh6v4BMmX wqlPXeMJYMz9tlPSjQeDv4My/Ps/uYsJlMW9vfA80qRz1Tm6AncSK9n+TUc5iqmg55VlOFrcgqZ AZquevEcKQ7/oBlTM4rngyTdJV3bK755S14go1jNq4T+84fFcS4NCdj3UCF27EUTulSmlxtqhE8 RXzUJZ14SRtYwmxwPcJzIL1wMWn8UGuVuplKbGi8FZlHWOdDz/YIrJKqCwI7JstNAa6BkyyWSi3 eZa6bT+0asxtdGYnk0woueMGs4R0D/AWFylLMmSX1T1099i0XbRjODf6IHNaX4D//BnOKjZYUen KxFHDtRBApCnGo96LRjj5t9zWAoMYtWP2JaRtH2S+Ppk6ZTDykipEUlwVk0yzFa8Z9xKa5ROCYT Hw73OSIloU0HsD+xjEg== X-Proofpoint-GUID: sa6fKmT46F8-35g2JtmvgmU5mEdVMk3N X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE3MDA5MiBTYWx0ZWRfX8u6t4g1Vt6GC +VPSskN63vHHcTKvIYH4judjW1OuW0le1LgxC4AjrnwdqtgQm1ZP7wC3NU9bOqnqfHN/U0w6ENF L0faWsaHrOi5kbOQZuUAivtjaL6/Lw4= X-Proofpoint-ORIG-GUID: sa6fKmT46F8-35g2JtmvgmU5mEdVMk3N X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-17_01,2026-06-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 bulkscore=0 suspectscore=0 lowpriorityscore=0 impostorscore=0 malwarescore=0 spamscore=0 adultscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606170092 Add a first document covering the Qemu s390 CPACF instructions and functions supported. Signed-off-by: Harald Freudenberger --- docs/system/s390x/cpacf.rst | 116 +++++++++++++++++++++++++++++++++++ docs/system/target-s390x.rst | 1 + 2 files changed, 117 insertions(+) create mode 100644 docs/system/s390x/cpacf.rst diff --git a/docs/system/s390x/cpacf.rst b/docs/system/s390x/cpacf.rst new file mode 100644 index 0000000000..85f35b4e9c --- /dev/null +++ b/docs/system/s390x/cpacf.rst @@ -0,0 +1,116 @@ +CPACF Support +============= + +CPACF +----- + +CP Assist for Cryptographic Function (CPACF) is a hardware-integrated +coprocessor feature built into every processor core of IBM Z and +LinuxONE mainframes (s390x architecture). It provides high-speed, +hardware-accelerated encryption and hashing directly on the CPU. + +CPACF provides a set of z/Architecture instructions (known as Message +Security Assist or MSA) that execute cryptographic operations +synchronously with the main processor. + +- Symmetric Encryption: Support for AES (128, 192, 256-bit), DES, and + Triple-DES (TDES). +- Hashing: Acceleration for SHA-1, SHA-2 (up to SHA-512), SHA-3 and + SHAKE. +- Random Number Generation: Pseudo Random Number Generator (PRNG) and + a hardware-based True Random Number Generator (TRNG). +- Asymmetric Support: Elliptic Curve Cryptography (ECC) primitives + P-256, P-384, P-521, Montgomery/Edwards curves (e.g., Ed25519). + +Documentation about CPACF instructions is public available and +can be found in the "z/Architecture Principles of Operation" +accessible at the IBM documentation hub https://www.ibm.com/docs/en. +For example the latest version as a pdf is available here: +https://www.ibm.com/support/pages/zvm/library/other/22783214.pdf + + +CPACF instructions +------------------ + +Here is a list of implemented CPACF instructions and the supported +functions for each instruction: + +KDSA (COMPUTE DIGITAL SIGNATURE AUTHENTICATION) +- Function code 0x00 - Function Query + +KIMD (COMPUTE INTERMEDIATE MESSAGE DIGEST) +- Function code 0x00 - Function Query +- Function code 0x02 - CPACF_KIMD_SHA_256 +- Function code 0x03 - CPACF_KIMD_SHA_512 + +KLMD (COMPUTE LAST MESSAGE DIGEST) +- Function code 0x00 - Function Query +- Function code 0x02 - CPACF_KLMD_SHA_256 +- Function code 0x03 - CPACF_KLMD_SHA_512 + +KM (CIPHER MESSAGE) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_KM_AES_128 +- Function code 0x13 - CPACF_KM_AES_192 +- Function code 0x14 - CPACF_KM_AES_256 +- Function code 0x1a - CPACF_KM_PAES_128 +- Function code 0x1b - CPACF_KM_PAES_192 +- Function code 0x1c - CPACF_KM_PAES_256 +- Function code 0x32 - CPACF_KM_XTS_128 +- Function code 0x34 - CPACF_KM_XTS_256 +- Function code 0x3a - CPACF_KM_PXTS_128 +- Function code 0x3c - CPACF_KM_PXTS_256 + +KMAC (COMPUTE MESSAGE AUTHENTICATION CODE) +- Function code 0x00 - Function Query + +KMC (CIPHER MESSAGE WITH CHAINING) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_KMC_AES_128 +- Function code 0x13 - CPACF_KMC_AES_192 +- Function code 0x14 - CPACF_KMC_AES_256 +- Function code 0x1a - CPACF_KMC_PAES_128 +- Function code 0x1b - CPACF_KMC_PAES_192 +- Function code 0x1c - CPACF_KMC_PAES_256 + +KMCTR (CIPHER MESSAGE WITH COUNTER) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_KMCTR_AES_128 +- Function code 0x13 - CPACF_KMCTR_AES_192 +- Function code 0x14 - CPACF_KMCTR_AES_256 +- Function code 0x1a - CPACF_KMCTR_PAES_128 +- Function code 0x1b - CPACF_KMCTR_PAES_192 +- Function code 0x1c - CPACF_KMCTR_PAES_256 + +KMF (CIPHER MESSAGE WITH CIPHER FEEDBACK) +- not supported + +KMO (CIPHER MESSAGE WITH OUTPUT FEEDBACK) +- not supported + +PCC (PERFORM CRYPTOGRAPHIC COMPUTATION) +- Function code 0x00 - Function Query +- Function code 0x32 - compute XTS param AES-128 +- Function code 0x34 - compute XTS param AES-256 +- Function code 0x3a - compute XTS param Encrypted AES-128 +- Function code 0x3c - compute XTS param Encrypted AES-256 + +PCKMO (PERFORM CRYPTOGRAPHIC KEY MANAGEMENT OPERATION) +- Function code 0x00 - Function Query +- Function code 0x12 - CPACF_PCKMO_ENC_AES_128_KEY +- Function code 0x13 - CPACF_PCKMO_ENC_AES_192_KEY +- Function code 0x14 - CPACF_PCKMO_ENC_AES_256_KEY + +PRNO (PERFORM RANDOM NUMBER OPERATION) +- Function code 0x00 - Function Query +- Function code 0x72 - CPACF_PRNO_TRNG + +Note that the use of a not supported CPACF instruction (KMF and KMO) +or invocation of a not listed function will result in a Specification +Exception. + +Not listed CPACF instructions (KMF, KMO) cause an Operation Exception +when used. Not listed functions cause a Specification Exception when +called. If only the query function is listed (KDSA), then the query +function will return a function status word with all but the query +function bit set to 0. diff --git a/docs/system/target-s390x.rst b/docs/system/target-s390x.rst index 94c981e732..49159826eb 100644 --- a/docs/system/target-s390x.rst +++ b/docs/system/target-s390x.rst @@ -35,3 +35,4 @@ Architectural features s390x/bootdevices s390x/protvirt s390x/cpu-topology + s390x/cpacf -- 2.43.0