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Wed, 16 Sep 2026 15:37:06 +0000 (GMT) Received: from [0.0.0.0] (unknown [9.111.77.88]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 16 Sep 2026 15:37:06 +0000 (GMT) Message-ID: Date: Wed, 16 Sep 2026 17:37:06 +0200 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 v4] s390/iomem: register initrd as an iomem resource when retain_initrd is set From: Ilya Leoshkevich To: Christian Brauner , Alexander Graf Cc: eoin.mcnamara@ibm.com, linux-s390@vger.kernel.org, Joseph Cathcart References: <20260818175755.3520-1-josephc@linux.ibm.com> <6f66956a-9793-4f96-b973-6e5875e5e433@linux.ibm.com> Content-Language: en-US In-Reply-To: <6f66956a-9793-4f96-b973-6e5875e5e433@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE2MDIxMSBTYWx0ZWRfX4FdJkzWDvfA2 /Pv1aqVNpnMA5JIIc7XmJFFDaF4FYHrLL8YASf4+U9dB5Y9O/uJvH6Nk6YjHAWjchgh9fhfbm9d JbcygvZ4YTn1nnG3objYvNSA4nAT8UKOJ4ut7QVOfcK7NJlU+DEzcwykXlV1NQSCFGv+/SIKx6a CacBUsPovbx7UN2hmPb9kEGhHlzWHOLfE+pdkai/eEfXqJzsC+R5rbJbpYLfhw1gjx5xLwNho4O 39VNHMn/Xa1d3OMnhEQbg+TnqXrHnK0HYKnCoZIvn7xNr5sveOLj6+iD53ZFmAN1VyAIk/I0r6C SFCo48pxnPkjZ8A2FsnFZcmpwOH0O8fbTShYbbr5xepeXtxEr7e5TJEA3B1ZFByzCBOIu51U3GO rcWcnrCJyll9cc7Ykd/7adUB4PWmU5kx2TgeIi2C4v8eXX6srCkhJIolHvCo5rLyebVpxzUm5LU fXVK/YWpOz0WvbyVIIw== X-Proofpoint-ORIG-GUID: sqUzDof7kwguD2SNK7smNyIA_tFrkphw X-Proofpoint-GUID: sqUzDof7kwguD2SNK7smNyIA_tFrkphw X-Proofpoint-Spam-Info: AW1haW4tMjYwOTE2MDIxMSBTYWx0ZWRfXyijzV3YqPLH8 q8GytlM0GOeopndpeqE9ibcuuu9z9hJhY8MArkvHYdcihnQifBGB6x/ssBu0ZXblUsPz2D2XnKL 7jbqwztnJJpIriDXiKVCpLUgll0BYA0= X-Authority-Analysis: v=2.4 cv=cY9HPXDM c=1 sm=1 tr=0 ts=6aaab7a5 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=f9Wuf_kVOTRuHot6Ck0A:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 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=2026-09-16_02,2026-09-16_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 bulkscore=0 clxscore=1015 suspectscore=0 impostorscore=0 malwarescore=0 phishscore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609160211 On 8/19/26 08:40, Ilya Leoshkevich wrote: > > > On 8/18/26 19:57, Joseph Cathcart wrote: >> Currently, /proc/iomem contains no reference to initrd memory, even >> when initrd is retained and still held in RAM. This makes the memory >> ranges invisible from userspace, and unusable to programs such as >> kexec. (A sysfs bin file is created for initrd, but this doesn't >> help programs which need the explicit memory ranges) >> >> Add initrd to standard_resources[] unconditionally. Add initrd as a >> child of iomem_resources only if retain_initrd is specified. >> >> strstr() could match substrings like "retain_initrd=0" or >> "no_retain_initrd", but this is how PPC chose to check for >> "retain_initrd" param too. (arch/powerpc/kexec/ranges.c) >> >> Signed-off-by: Joseph Cathcart >> --- >>   arch/s390/kernel/setup.c | 22 ++++++++++++++++++++++ >>   1 file changed, 22 insertions(+) [...] > Cc: Christian and Alexander. > > I wonder if it would make sense to move initrd resource creation to > do_populate_rootfs(), right after /sys/firmware/initrd creation, > enabling this feature on all architectures? Ping.