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Thu, 18 Nov 2021 17:50:18 +0000 From: Eric DeVolder To: linux-kernel@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, ebiederm@xmission.com, dyoung@redhat.com, bhe@redhat.com, vgoyal@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, nramas@linux.microsoft.com, thomas.lendacky@amd.com, robh@kernel.org, efault@gmx.de, rppt@kernel.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, eric.devolder@oracle.com Subject: [RFC v1 5/8] crash hp: kexec_file changes for use by crash hotplug handler Date: Thu, 18 Nov 2021 12:49:45 -0500 Message-Id: <20211118174948.37435-6-eric.devolder@oracle.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211118174948.37435-1-eric.devolder@oracle.com> References: <20211118174948.37435-1-eric.devolder@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SA9PR13CA0124.namprd13.prod.outlook.com (2603:10b6:806:27::9) To CO1PR10MB4531.namprd10.prod.outlook.com (2603:10b6:303:6c::22) MIME-Version: 1.0 Received: from localhost.localdomain (138.3.201.23) by SA9PR13CA0124.namprd13.prod.outlook.com (2603:10b6:806:27::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4734.7 via Frontend Transport; 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The prototype for kexec_calculate_store_digests() was hoisted to linux/kexec.h and the function made non-static. The crash_prepare_elf64_headers() had the struct kimage parameter added so that the check for the offlinecpu could be performed and this routine re-used by the crash hotplug handler. Finally, kexec_add_buffer() changed slightly so that it does not attempt to add the buffer to the kimage when being called from the crash hotplug handler. Signed-off-by: Eric DeVolder --- kernel/kexec_file.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 8347fc158d2b..c9e8e5b94382 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -29,8 +29,6 @@ #include #include "kexec_internal.h" -static int kexec_calculate_store_digests(struct kimage *image); - /* * Currently this is the only default function that is exported as some * architectures need it to do additional handlings. @@ -674,6 +672,12 @@ int kexec_add_buffer(struct kexec_buf *kbuf) struct kexec_segment *ksegment; int ret; +#ifdef CONFIG_CRASH_HOTPLUG + /* When servicing a hotplug event, do not add buffers to the image */ + if (kbuf->image->hotplug_event) + return 0; +#endif + /* Currently adding segment this way is allowed only in file mode */ if (!kbuf->image->file_mode) return -EINVAL; @@ -713,7 +717,7 @@ int kexec_add_buffer(struct kexec_buf *kbuf) } /* Calculate and store the digest of segments */ -static int kexec_calculate_store_digests(struct kimage *image) +int kexec_calculate_store_digests(struct kimage *image) { struct crypto_shash *tfm; struct shash_desc *desc; @@ -1260,8 +1264,8 @@ int crash_exclude_mem_range(struct crash_mem *mem, return 0; } -int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, - void **addr, unsigned long *sz) +int crash_prepare_elf64_headers(struct kimage *image, struct crash_mem *mem, + int kernel_map, void **addr, unsigned long *sz) { Elf64_Ehdr *ehdr; Elf64_Phdr *phdr; @@ -1308,6 +1312,11 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, /* Prepare one phdr of type PT_NOTE for each present CPU */ for_each_present_cpu(cpu) { +#ifdef CONFIG_CRASH_HOTPLUG + /* Skip the soon-to-be offlined cpu */ + if (image->hotplug_event && (cpu == image->offlinecpu)) + continue; +#endif phdr->p_type = PT_NOTE; notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu)); phdr->p_offset = phdr->p_paddr = notes_addr; -- 2.27.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx0b-00069f02.pphosted.com ([205.220.177.32]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mnlYb-008UKI-4X for kexec@lists.infradead.org; Thu, 18 Nov 2021 17:50:46 +0000 From: Eric DeVolder Subject: [RFC v1 5/8] crash hp: kexec_file changes for use by crash hotplug handler Date: Thu, 18 Nov 2021 12:49:45 -0500 Message-Id: <20211118174948.37435-6-eric.devolder@oracle.com> In-Reply-To: <20211118174948.37435-1-eric.devolder@oracle.com> References: <20211118174948.37435-1-eric.devolder@oracle.com> MIME-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: linux-kernel@vger.kernel.org, x86@kernel.org, kexec@lists.infradead.org, ebiederm@xmission.com, dyoung@redhat.com, bhe@redhat.com, vgoyal@redhat.com Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, nramas@linux.microsoft.com, thomas.lendacky@amd.com, robh@kernel.org, efault@gmx.de, rppt@kernel.org, konrad.wilk@oracle.com, boris.ostrovsky@oracle.com, eric.devolder@oracle.com Three minor changes are made to this file to facilitate re-using the functions from within a crash hotplug handler. The prototype for kexec_calculate_store_digests() was hoisted to linux/kexec.h and the function made non-static. The crash_prepare_elf64_headers() had the struct kimage parameter added so that the check for the offlinecpu could be performed and this routine re-used by the crash hotplug handler. Finally, kexec_add_buffer() changed slightly so that it does not attempt to add the buffer to the kimage when being called from the crash hotplug handler. Signed-off-by: Eric DeVolder --- kernel/kexec_file.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 8347fc158d2b..c9e8e5b94382 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -29,8 +29,6 @@ #include #include "kexec_internal.h" -static int kexec_calculate_store_digests(struct kimage *image); - /* * Currently this is the only default function that is exported as some * architectures need it to do additional handlings. @@ -674,6 +672,12 @@ int kexec_add_buffer(struct kexec_buf *kbuf) struct kexec_segment *ksegment; int ret; +#ifdef CONFIG_CRASH_HOTPLUG + /* When servicing a hotplug event, do not add buffers to the image */ + if (kbuf->image->hotplug_event) + return 0; +#endif + /* Currently adding segment this way is allowed only in file mode */ if (!kbuf->image->file_mode) return -EINVAL; @@ -713,7 +717,7 @@ int kexec_add_buffer(struct kexec_buf *kbuf) } /* Calculate and store the digest of segments */ -static int kexec_calculate_store_digests(struct kimage *image) +int kexec_calculate_store_digests(struct kimage *image) { struct crypto_shash *tfm; struct shash_desc *desc; @@ -1260,8 +1264,8 @@ int crash_exclude_mem_range(struct crash_mem *mem, return 0; } -int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, - void **addr, unsigned long *sz) +int crash_prepare_elf64_headers(struct kimage *image, struct crash_mem *mem, + int kernel_map, void **addr, unsigned long *sz) { Elf64_Ehdr *ehdr; Elf64_Phdr *phdr; @@ -1308,6 +1312,11 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map, /* Prepare one phdr of type PT_NOTE for each present CPU */ for_each_present_cpu(cpu) { +#ifdef CONFIG_CRASH_HOTPLUG + /* Skip the soon-to-be offlined cpu */ + if (image->hotplug_event && (cpu == image->offlinecpu)) + continue; +#endif phdr->p_type = PT_NOTE; notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu)); phdr->p_offset = phdr->p_paddr = notes_addr; -- 2.27.0 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec