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Fri, 17 Jul 2020 04:46:29 +0000 (GMT) Received: from [9.102.1.129] (unknown [9.102.1.129]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTP id D3ACF5227A; Fri, 17 Jul 2020 04:46:26 +0000 (GMT) Subject: Re: [PATCH v3 02/12] powerpc/kexec_file: mark PPC64 specific code To: Thiago Jung Bauermann References: <159466074408.24747.10036072269371204890.stgit@hbathini.in.ibm.com> <159466085652.24747.2414199807974963385.stgit@hbathini.in.ibm.com> <87v9io8c13.fsf@morokweng.localdomain> From: Hari Bathini Message-ID: <63d551a9-684b-768b-8b0f-2a0da68d7f11@linux.ibm.com> Date: Fri, 17 Jul 2020 10:16:25 +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: <87v9io8c13.fsf@morokweng.localdomain> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-16_11:2020-07-16, 2020-07-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_spam_definite policy=outbound score=100 malwarescore=0 bulkscore=0 adultscore=0 clxscore=1015 phishscore=0 spamscore=100 impostorscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 mlxscore=100 mlxlogscore=-1000 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007170029 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: Pingfan Liu , Petr Tesarik , Nayna Jain , Kexec-ml , Mahesh J Salgaonkar , Mimi Zohar , lkml , linuxppc-dev , Sourabh Jain , Andrew Morton , Dave Young , Vivek Goyal , Eric Biederman Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 16/07/20 7:19 am, Thiago Jung Bauermann wrote: > > I didn't forget about this patch. I just wanted to see more of the > changes before comenting on it. > > Hari Bathini writes: > >> Some of the kexec_file_load code isn't PPC64 specific. Move PPC64 >> specific code from kexec/file_load.c to kexec/file_load_64.c. Also, >> rename purgatory/trampoline.S to purgatory/trampoline_64.S in the >> same spirit. > > There's only a 64 bit implementation of kexec_file_load() so this is a > somewhat theoretical exercise, but there's no harm in getting the code > organized, so: > > Reviewed-by: Thiago Jung Bauermann > > I have just one question below. >> +/** >> + * setup_new_fdt_ppc64 - Update the flattend device-tree of the kernel >> + * being loaded. >> + * @image: kexec image being loaded. >> + * @fdt: Flattened device tree for the next kernel. >> + * @initrd_load_addr: Address where the next initrd will be loaded. >> + * @initrd_len: Size of the next initrd, or 0 if there will be none. >> + * @cmdline: Command line for the next kernel, or NULL if there will >> + * be none. >> + * >> + * Returns 0 on success, negative errno on error. >> + */ >> +int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, >> + unsigned long initrd_load_addr, >> + unsigned long initrd_len, const char *cmdline) >> +{ >> + int chosen_node, ret; >> + >> + /* Remove memory reservation for the current device tree. */ >> + ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params), >> + fdt_totalsize(initial_boot_params)); >> + if (ret == 0) >> + pr_debug("Removed old device tree reservation.\n"); >> + else if (ret != -ENOENT) { >> + pr_err("Failed to remove old device-tree reservation.\n"); >> + return ret; >> + } >> + >> + ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, >> + cmdline, &chosen_node); >> + if (ret) >> + return ret; >> + >> + ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0); >> + if (ret) >> + pr_err("Failed to update device-tree with linux,booted-from-kexec\n"); >> + >> + return ret; >> +} > > For setup_purgatory_ppc64() you start with an empty function and build > from there, but for setup_new_fdt_ppc64() you moved some code here. Is > the code above 64 bit specific? Actually, I was not quiet sure if fdt updates like in patch 6 & patch 9 can be done after setup_ima_buffer() call. If you can confirm, I will move them back to setup_purgatory() Thanks Hari