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Wed, 29 Jul 2026 08:29:56 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 66T8TqU230212496 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 29 Jul 2026 08:29:52 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 65E5D2004B; Wed, 29 Jul 2026 08:29:52 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 308A820040; Wed, 29 Jul 2026 08:29:50 +0000 (GMT) Received: from shivang.upadyay (unknown [9.123.12.247]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 29 Jul 2026 08:29:49 +0000 (GMT) Message-ID: Subject: Re: [PATCH] ppc/fadump: collect dump if the collected size is lesser than reserved From: Shivang Upadhyay To: Sourabh Jain , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Cc: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, adri.vero.dev@gmail.com, adityag@linux.ibm.com, anushree.mathur@linux.vnet.ibm.com Date: Wed, 29 Jul 2026 13:59:49 +0530 In-Reply-To: <93bd50eb-0205-4ed6-a3cb-a29bda61db3d@linux.ibm.com> References: <20260714173010.615682-1-shivangu@linux.ibm.com> <446c84c2-8639-4ecb-8a46-1e203a166e46@linux.ibm.com> <72589eca-2e97-4a2f-8665-b2a817a04722@linux.ibm.com> <7618bf3e48f6770a803f8350d0b3b084c23042fa.camel@linux.ibm.com> <7eb8ed5f-0652-4675-9369-913a17463093@linux.ibm.com> <4e7bd9342efa0cbdd162445a994f73c9ad473645.camel@linux.ibm.com> <93bd50eb-0205-4ed6-a3cb-a29bda61db3d@linux.ibm.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: 1d0Vcxr9yfaewvsKtKNh2BqsgKPSssPk X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI5MDA2NyBTYWx0ZWRfX69DtPFzraI49 eFQ1cyt4lO0aL8CGOOKjc3Fqe33TeiUJRqdEXOWxItAz7ZLZNWSN7ft+okmd2z1G1Wu0uSHjjDQ ewauO3mKHEgOZK1/PgIw6V9gx5OXjhg= X-Authority-Analysis: v=2.4 cv=E/z9Y6dl c=1 sm=1 tr=0 ts=6a69ba05 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=rpqpEAD7TqKRoYK_KpsA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI5MDA2NyBTYWx0ZWRfX5DxMEKmnpeU4 I/1iZSLA9V0z16VQB7keOUa6Vj3K1kxbcyWUpMPkLlgvZFTmno/naeUtI0UJeXNYZGruC+zbxhf S7T4yBqYbHepAcG4SpYICpND/NbxhOoum1ovMyngKAsucE5v58etDWF8jSs7EcPttOBr8N/+o34 bzQZ7xCbp9qUc0i8hZM6mbeUg8Bsqq8S0FRwJUFfv5HnnEIzso55vmMicURp/K9DJJiPJvRJEjI juM6+MlISQue1+BABnS/wi0KzPmbiO6/ZQx0C3nqoz/nQ4tyEBfaxq9o2F6hZcYWJyFxS0KLL4Z ynmUxtxs8ZLMr8zlFkSOSTztSAcQFr84D7484QJMOUUC6O8V7GB7qrVvrgrLhXdhZwPZv83OLv6 mOa4uMf7uXliVe5r5Xt5SQUDEeV6ECB43kGvsF2aD3pozdRwZPqZCxr4BjSWdmLlTVtWwKxV9ju xZ7ao0xbmya94iQh8sw== X-Proofpoint-GUID: qga9K5d7LE2WnBUUIQ7B1ZmnhjZgUc_v X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-29_03,2026-07-28_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 spamscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 bulkscore=0 malwarescore=0 impostorscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607290067 On Wed, 2026-07-29 at 13:43 +0530, Sourabh Jain wrote: > > > But the firmware not copying the entire Real Mode memory is also > > > a > > > problem for > > > the kernel, isn't it? > > >=20 > > I think it should be fine. Firmware will report it status flags, > > right? >=20 > I don't know. Does PAPR says anything about the error code > corresponds > to when memory to not copied completely? As much as i could search, I didn't see this case metioned there. I think if, fw is failing to copy full content it should report one of the below errors. - copy from [x...x+size] to [y...y+size].=20 - x + x_i is not valid=20 - leads to invalid source address. - y + y+i is not valid - leads to invalid dest address. But anyways, As the source/proper description is not available, we can't prove much here. Would it be appropriate, if I just make this case for CPU_DATA area? ~Shivang.