On 01/05/23 at 10:17am, Eric DeVolder wrote:
......
> @@ -394,10 +409,37 @@ int crash_load_segments(struct kimage *image)
> if (ret)
> return ret;
>
> - image->elf_headers = kbuf.buffer;
> - image->elf_headers_sz = kbuf.bufsz;
> + image->elf_headers = kbuf.buffer;
> + image->elf_headers_sz = kbuf.bufsz;
> + kbuf.memsz = kbuf.bufsz;
> +
> + if (IS_ENABLED(CONFIG_CRASH_HOTPLUG)) {
> + /*
> + * Ensure the elfcorehdr segment large enough for hotplug changes.
> + * Start with VMCOREINFO and kernel_map.
> + */
> + unsigned long pnum = 2;
> +
> + if (IS_ENABLED(CONFIG_HOTPLUG_CPU))
> + pnum += CONFIG_NR_CPUS_DEFAULT;
> +
> + if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG))
> + pnum += CRASH_MAX_MEMORY_RANGES;
Logic of pnum calculating is a little confusing to me. If I only enable
one of CONFIG_HOTPLUG_CPU and CONFIG_MEMORY_HOTPLUG, is it OK? Say I
only enable CONFIG_HOTPLUG_CPU and CONFIG_SMP, on x86_64,
CONFIG_NR_CPUS_DEFAULT will be 64. pnum will be 64, is it OK. Am I miss
anything?
> +
> + if (pnum < (unsigned long)PN_XNUM) {
> + kbuf.memsz = pnum * sizeof(Elf64_Phdr);
> + kbuf.memsz += sizeof(Elf64_Ehdr);
> +
> + image->elfcorehdr_index = image->nr_segments;
> + image->elfcorehdr_index_valid = true;
> +
> + /* Mark as usable to crash kernel, else crash kernel fails on boot */
> + image->elf_headers_sz = kbuf.memsz;
> + } else {
> + pr_err("number of Phdrs %lu exceeds max\n", pnum);
> + }
> + }
>
> - kbuf.memsz = kbuf.bufsz;
> kbuf.buf_align = ELF_CORE_HEADER_ALIGN;
> kbuf.mem = KEXEC_BUF_MEM_UNKNOWN;
> ret = kexec_add_buffer(&kbuf);
> @@ -412,3 +454,67 @@ int crash_load_segments(struct kimage *image)
> return ret;
> }
> #endif /* CONFIG_KEXEC_FILE */
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