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Mon, 11 Dec 2023 08:31:51 +0000 (GMT) From: Sourabh Jain To: linuxppc-dev@ozlabs.org Subject: [PATCH v14 3/6] crash: add a new kexec flag for FDT update Date: Mon, 11 Dec 2023 14:00:53 +0530 Message-ID: <20231211083056.340404-4-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231211083056.340404-1-sourabhjain@linux.ibm.com> References: <20231211083056.340404-1-sourabhjain@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Zo0hfFvALfhaNcQe-_sSblPS0nfbeR0_ X-Proofpoint-GUID: TineP5Zea9Ovm8qcvZNG9pMjNlcyte7a X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-11_02,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 adultscore=0 phishscore=0 mlxscore=0 malwarescore=0 spamscore=0 mlxlogscore=999 lowpriorityscore=0 suspectscore=0 impostorscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2312110071 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: David Hildenbrand , Dave Hansen , Mimi Zohar , Eric DeVolder , Boris Ostrovsky , Valentin Schneider , Baoquan He , x86@kernel.org, "Aneesh Kumar K . V" , Laurent Dufour , Dave Young , Vivek Goyal , Naveen N Rao , Borislav Petkov , Thomas Gleixner , Hari Bathini , Oscar Salvador , Greg Kroah-Hartman , kexec@lists.infradead.org, Mahesh Salgaonkar , Sourabh Jain , Akhil Raj , Andrew Morton Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" The commit a72bbec70da2 ("crash: hotplug support for kexec_load()") introduced a new kexec flag, `KEXEC_UPDATE_ELFCOREHDR`. Kexec tool uses this flag to indicate kernel that it is safe to modify the elfcorehdr of kdump image loaded using kexec_load system call. Similarly, add a new kexec flag, `KEXEC_UPDATE_FDT`, for another kdump component named FDT (Flatten Device Tree). Architectures like PowerPC need to update FDT kdump image component on CPU hotplug events. Kexec tool passing `KEXEC_UPDATE_FDT` will be an indication to kernel that FDT segment is not part of SHA calculation hence it is safe to update it. With the `KEXEC_UPDATE_ELFCOREHDR` and `KEXEC_UPDATE_FDT` kexec flags, crash hotplug support can be added to PowerPC for the kexec_load syscall while maintaining the backward compatibility with older kexec tools that do not have these newly introduced flags. Signed-off-by: Sourabh Jain Cc: Akhil Raj Cc: Andrew Morton Cc: Aneesh Kumar K.V Cc: Baoquan He Cc: Borislav Petkov (AMD) Cc: Boris Ostrovsky Cc: Christophe Leroy Cc: Dave Hansen Cc: Dave Young Cc: David Hildenbrand Cc: Eric DeVolder Cc: Greg Kroah-Hartman Cc: Hari Bathini Cc: Laurent Dufour Cc: Mahesh Salgaonkar Cc: Michael Ellerman Cc: Mimi Zohar Cc: Naveen N Rao Cc: Oscar Salvador Cc: Thomas Gleixner Cc: Valentin Schneider Cc: Vivek Goyal Cc: kexec@lists.infradead.org Cc: x86@kernel.org --- include/linux/kexec.h | 6 ++++-- include/uapi/linux/kexec.h | 1 + kernel/kexec.c | 2 ++ 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 0f6ea35879ee..bcedb7625b1f 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -319,6 +319,7 @@ struct kimage { #ifdef CONFIG_CRASH_HOTPLUG /* If set, allow changes to elfcorehdr of kexec_load'd image */ unsigned int update_elfcorehdr:1; + unsigned int update_fdt:1; #endif #ifdef ARCH_HAS_KIMAGE_ARCH @@ -396,9 +397,10 @@ bool kexec_load_permitted(int kexec_image_type); /* List of defined/legal kexec flags */ #ifndef CONFIG_KEXEC_JUMP -#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_UPDATE_ELFCOREHDR) +#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_UPDATE_ELFCOREHDR | KEXEC_UPDATE_FDT) #else -#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR) +#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_UPDATE_ELFCOREHDR | \ + KEXEC_UPDATE_FDT) #endif /* List of defined/legal kexec file flags */ diff --git a/include/uapi/linux/kexec.h b/include/uapi/linux/kexec.h index 01766dd839b0..3d5b3d757bed 100644 --- a/include/uapi/linux/kexec.h +++ b/include/uapi/linux/kexec.h @@ -13,6 +13,7 @@ #define KEXEC_ON_CRASH 0x00000001 #define KEXEC_PRESERVE_CONTEXT 0x00000002 #define KEXEC_UPDATE_ELFCOREHDR 0x00000004 +#define KEXEC_UPDATE_FDT 0x00000008 #define KEXEC_ARCH_MASK 0xffff0000 /* diff --git a/kernel/kexec.c b/kernel/kexec.c index 8f35a5a42af8..97eb151cd931 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -132,6 +132,8 @@ static int do_kexec_load(unsigned long entry, unsigned long nr_segments, #ifdef CONFIG_CRASH_HOTPLUG if (flags & KEXEC_UPDATE_ELFCOREHDR) image->update_elfcorehdr = 1; + if (flags & KEXEC_UPDATE_FDT) + image->update_fdt = 1; #endif ret = machine_kexec_prepare(image);