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Fri, 27 Mar 2026 08:52:31 +0000 (GMT) Message-ID: <65c3d229-57ee-4980-a13f-bc9661b4dda1@linux.ibm.com> Date: Fri, 27 Mar 2026 09:52:31 +0100 Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] crypto: s390 - Remove des and des3_ede code To: Eric Biggers Cc: linux-crypto@vger.kernel.org, Herbert Xu , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org, Harald Freudenberger References: <20260326201246.57544-1-ebiggers@kernel.org> <20260326201246.57544-2-ebiggers@kernel.org> From: Holger Dengler Content-Language: de-DE, en-US In-Reply-To: <20260326201246.57544-2-ebiggers@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: C9kv1xhgntrj6fN5Vjn6ldIrWVEKKlgA X-Authority-Analysis: v=2.4 cv=aMr9aL9m c=1 sm=1 tr=0 ts=69c64553 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=w46-cfdy0MOtRbFV-QQA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI3MDA2NCBTYWx0ZWRfX0CSKyORlz5x4 Tm4DzJ+vaUcJYt+if12Wrb/uh1eTbLJjh705AtyR8SwXXBNa8Cl3jjlxU5wqnk1Y4zR8DGcJZNW IpgNd9uprG/MPxM+SzNmkCezi3jQZWvOGFdlnYTNfCW0sg/CQU11VzGN+Wfmbx/oO/5vqs3QVZk Rdm6PyHYWBRH4z9sD4FbO3RcuJXQU+E/s6ODZBcGyV3wsFq8Iq+8P5zFie8kuxaxiuuJRDY72qP kCfeRHBzONTEcYoGzNYMkfb9Lltr9RQrIZm64HJuRxgQ7p6tLZa0mQN4sbl7fFsBfvdmoPdGLin aZTGzPkLtSALBW7FMrzjEX5sPh5rURuOotqTSyAuTSihW6FfSroneMW2YP1AO5mL3yc+qq0zI+n aKjil6oFUCOzY3ZjwKT0ElYOB621HhWmw/HBbDmkawvII6xF+x/L53Vwl2kDuOn6euvPtsMgQ1Q EjplDl0CEkvMetEB12w== X-Proofpoint-GUID: C9kv1xhgntrj6fN5Vjn6ldIrWVEKKlgA X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-26_04,2026-03-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 adultscore=0 impostorscore=0 malwarescore=0 suspectscore=0 phishscore=0 priorityscore=1501 bulkscore=0 clxscore=1011 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603270064 Hi Eric, On 26/03/2026 21:12, Eric Biggers wrote: > Since DES and Triple DES are obsolete, there is very little point in > maintining architecture-optimized code for them. Remove it. > > Signed-off-by: Eric Biggers Are there plans to completely remove des/3des in-kernel crypto support from the kernel or is it just the arch-specific code, that is removed? In fact there are still customers using des/3des (unbelievable!), but the valid question is, do they also using the in-kernel crypto for their workloads. I'll try to figure that out. Unfortunately, Harald is a few days off and I need to discuss the removal with him as well. Regarding the testing: in our CI we're running all in-kernel crypto modules every night, including des/3des. So there is some test coverage. Regarding qemu: we're currently investigating if we can provide qemu-support for the s390 crypto instructions, but, to be honest, des/3des was not on our top-priority list until now... ;) We'll come back to you in a week or so. I hope, that's ok... -- Mit freundlichen Grüßen / Kind regards Holger Dengler -- IBM Systems, Linux on IBM Z Development dengler@linux.ibm.com