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Thu, 20 Mar 2025 16:34:46 +0000 (GMT) Message-ID: <96b38fd7-b134-4b54-bbdb-7fea6b37dbe1@linux.ibm.com> Date: Thu, 20 Mar 2025 17:34:45 +0100 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 20/20] s390/pkey/crypto: Introduce xflags param for pkey in-kernel API To: Harald Freudenberger , ifranzki@linux.ibm.com, fcallies@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com Cc: linux-s390@vger.kernel.org, herbert@gondor.apana.org.au References: <20250304172116.85374-1-freude@linux.ibm.com> <20250304172116.85374-21-freude@linux.ibm.com> Content-Language: en-US From: Holger Dengler In-Reply-To: <20250304172116.85374-21-freude@linux.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: Jxph_4Us5K3G9DFfcNOp2VgK-BA69LM7 X-Proofpoint-ORIG-GUID: Jxph_4Us5K3G9DFfcNOp2VgK-BA69LM7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1093,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-20_04,2025-03-20_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 mlxscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 phishscore=0 malwarescore=0 bulkscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503200104 On 04/03/2025 18:21, Harald Freudenberger wrote: > Add a new parameter xflags to the in-kernel API function > pkey_key2protkey(). Currently there is only one flag supported: > > * PKEY_XFLAG_NOMEMALLOC: > If this flag is given in the xflags parameter, the pkey implementation > is not allowed to allocate memory but instead should fall back to use > preallocated memory or simple fail with -ENOMEM. > This flag is for protected key derive within a cipher or similar > which must not allocate memory which would cause io operations - see > also the CRYPTO_ALG_ALLOCATES_MEMORY flag in crypto.h. > > The one and only user of this in-kernel API - the skcipher > implementations PAES in paes_s390.c set this flag upon request > to derive a protected key from the given raw key material. > > Signed-off-by: Harald Freudenberger Reviewed-by: Holger Dengler -- Mit freundlichen Grüßen / Kind regards Holger Dengler -- IBM Systems, Linux on IBM Z Development dengler@linux.ibm.com