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Mon, 29 Jun 2020 05:55:08 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 05T5t6hY29098208 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 29 Jun 2020 05:55:06 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 148CAA404D; Mon, 29 Jun 2020 05:55:06 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 246A1A4040; Mon, 29 Jun 2020 05:55:03 +0000 (GMT) Received: from [9.102.0.109] (unknown [9.102.0.109]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 29 Jun 2020 05:55:02 +0000 (GMT) Subject: Re: [PATCH 04/11] ppc64/kexec_file: avoid stomping memory used by special regions To: piliu , Michael Ellerman , Andrew Morton References: <159319825403.16351.7253978047621755765.stgit@hbathini.in.ibm.com> <159319831192.16351.17443438699302756548.stgit@hbathini.in.ibm.com> <9cfda789-0747-a67a-b825-5ea6f15099b8@redhat.com> From: Hari Bathini Message-ID: Date: Mon, 29 Jun 2020 11:25:02 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <9cfda789-0747-a67a-b825-5ea6f15099b8@redhat.com> Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-29_04:2020-06-26, 2020-06-29 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 clxscore=1015 mlxlogscore=999 impostorscore=0 lowpriorityscore=0 suspectscore=0 mlxscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 phishscore=0 cotscore=-2147483648 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006290039 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kexec-ml , Petr Tesarik , Mahesh J Salgaonkar , Sourabh Jain , lkml , linuxppc-dev , Mimi Zohar , Thiago Jung Bauermann , Dave Young , Vivek Goyal , Eric Biederman Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 28/06/20 7:44 am, piliu wrote: > Hi Hari, Hi Pingfan, > > After a quick through for this series, I have a few question/comment on > this patch for the time being. Pls see comment inline. > > On 06/27/2020 03:05 AM, Hari Bathini wrote: >> crashkernel region could have an overlap with special memory regions >> like opal, rtas, tce-table & such. These regions are referred to as >> exclude memory ranges. Setup this ranges during image probe in order >> to avoid them while finding the buffer for different kdump segments. [...] >> + /* >> + * Use the locate_mem_hole logic in kexec_add_buffer() for regular >> + * kexec_file_load syscall >> + */ >> + if (kbuf->image->type != KEXEC_TYPE_CRASH) >> + return 0; > Can the ranges overlap [crashk_res.start, crashk_res.end]? Otherwise > there is no requirement for @exclude_ranges. The ranges like rtas, opal are loaded by f/w. They almost always overlap with crashkernel region. So, @exclude_ranges is required to support kdump. > I guess you have a design for future. If not true, then it is better to > fold the condition "if (kbuf->image->type != KEXEC_TYPE_CRASH)" into the > caller and rename this function to better distinguish use cases between > kexec and kdump Yeah, this condition will be folded. I have a follow-up patch for that explaining why kexec case should also be folded. Will try to add that to this series for v2. Thanks Hari