diff options
Diffstat (limited to 'kernel/kexec.c')
| -rw-r--r-- | kernel/kexec.c | 41 |
1 files changed, 29 insertions, 12 deletions
diff --git a/kernel/kexec.c b/kernel/kexec.c index 296fbc84d659..dc7bc0829286 100644 --- a/kernel/kexec.c +++ b/kernel/kexec.c @@ -498,7 +498,7 @@ static struct page *kimage_alloc_crash_control_pages(struct kimage *image, while (hole_end <= crashk_res.end) { unsigned long i; - if (hole_end > KEXEC_CONTROL_MEMORY_LIMIT) + if (hole_end > KEXEC_CRASH_CONTROL_MEMORY_LIMIT) break; if (hole_end > crashk_res.end) break; @@ -999,6 +999,7 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, kimage_free(xchg(&kexec_crash_image, NULL)); result = kimage_crash_alloc(&image, entry, nr_segments, segments); + crash_map_reserved_pages(); } if (result) goto out; @@ -1015,6 +1016,8 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments, goto out; } kimage_terminate(image); + if (flags & KEXEC_ON_CRASH) + crash_unmap_reserved_pages(); } /* Install the new kernel, and Uninstall the old */ image = xchg(dest_image, image); @@ -1026,6 +1029,18 @@ out: return result; } +/* + * Add and remove page tables for crashkernel memory + * + * Provide an empty default implementation here -- architecture + * code may override this + */ +void __weak crash_map_reserved_pages(void) +{} + +void __weak crash_unmap_reserved_pages(void) +{} + #ifdef CONFIG_COMPAT asmlinkage long compat_sys_kexec_load(unsigned long entry, unsigned long nr_segments, @@ -1134,14 +1149,16 @@ int crash_shrink_memory(unsigned long new_size) goto unlock; } - start = roundup(start, PAGE_SIZE); - end = roundup(start + new_size, PAGE_SIZE); + start = roundup(start, KEXEC_CRASH_MEM_ALIGN); + end = roundup(start + new_size, KEXEC_CRASH_MEM_ALIGN); + crash_map_reserved_pages(); crash_free_reserved_phys_range(end, crashk_res.end); if ((start == end) && (crashk_res.parent != NULL)) release_resource(&crashk_res); crashk_res.end = end - 1; + crash_unmap_reserved_pages(); unlock: mutex_unlock(&kexec_mutex); @@ -1380,24 +1397,23 @@ int __init parse_crashkernel(char *cmdline, } - -void crash_save_vmcoreinfo(void) +static void update_vmcoreinfo_note(void) { - u32 *buf; + u32 *buf = vmcoreinfo_note; if (!vmcoreinfo_size) return; - - vmcoreinfo_append_str("CRASHTIME=%ld", get_seconds()); - - buf = (u32 *)vmcoreinfo_note; - buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data, vmcoreinfo_size); - final_note(buf); } +void crash_save_vmcoreinfo(void) +{ + vmcoreinfo_append_str("CRASHTIME=%ld", get_seconds()); + update_vmcoreinfo_note(); +} + void vmcoreinfo_append_str(const char *fmt, ...) { va_list args; @@ -1483,6 +1499,7 @@ static int __init crash_save_vmcoreinfo_init(void) VMCOREINFO_NUMBER(PG_swapcache); arch_crash_save_vmcoreinfo(); + update_vmcoreinfo_note(); return 0; } |