diff options
Diffstat (limited to 'arch/s390/boot/startup.c')
| -rw-r--r-- | arch/s390/boot/startup.c | 86 |
1 files changed, 48 insertions, 38 deletions
diff --git a/arch/s390/boot/startup.c b/arch/s390/boot/startup.c index 50475bf25ecd..bc07e24329b9 100644 --- a/arch/s390/boot/startup.c +++ b/arch/s390/boot/startup.c @@ -21,7 +21,6 @@ unsigned long __bootdata_preserved(__kaslr_offset); unsigned long __bootdata_preserved(__abs_lowcore); unsigned long __bootdata_preserved(__memcpy_real_area); pte_t *__bootdata_preserved(memcpy_real_ptep); -unsigned long __bootdata(__amode31_base); unsigned long __bootdata_preserved(VMALLOC_START); unsigned long __bootdata_preserved(VMALLOC_END); struct page *__bootdata_preserved(vmemmap); @@ -29,7 +28,6 @@ unsigned long __bootdata_preserved(vmemmap_size); unsigned long __bootdata_preserved(MODULES_VADDR); unsigned long __bootdata_preserved(MODULES_END); unsigned long __bootdata(ident_map_size); -struct initrd_data __bootdata(initrd_data); u64 __bootdata_preserved(stfle_fac_list[16]); u64 __bootdata_preserved(alt_stfle_fac_list[16]); @@ -75,17 +73,20 @@ unsigned long mem_safe_offset(void) } #endif -static unsigned long rescue_initrd(unsigned long safe_addr) +static void rescue_initrd(unsigned long min, unsigned long max) { + unsigned long old_addr, addr, size; + if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD)) - return safe_addr; - if (!initrd_data.start || !initrd_data.size) - return safe_addr; - if (initrd_data.start < safe_addr) { - memmove((void *)safe_addr, (void *)initrd_data.start, initrd_data.size); - initrd_data.start = safe_addr; - } - return initrd_data.start + initrd_data.size; + return; + if (!get_physmem_reserved(RR_INITRD, &addr, &size)) + return; + if (addr >= min && addr + size <= max) + return; + old_addr = addr; + physmem_free(RR_INITRD); + addr = physmem_alloc_top_down(RR_INITRD, size, 0); + memmove((void *)addr, (void *)old_addr, size); } static void copy_bootdata(void) @@ -267,46 +268,52 @@ static void offset_vmlinux_info(unsigned long offset) vmlinux.invalid_pg_dir_off += offset; } -static unsigned long reserve_amode31(unsigned long safe_addr) -{ - __amode31_base = PAGE_ALIGN(safe_addr); - return __amode31_base + vmlinux.amode31_size; -} - void startup_kernel(void) { unsigned long max_physmem_end; unsigned long random_lma; - unsigned long safe_addr; unsigned long asce_limit; + unsigned long safe_addr; void *img; psw_t psw; - initrd_data.start = parmarea.initrd_start; - initrd_data.size = parmarea.initrd_size; + setup_lpp(); + safe_addr = mem_safe_offset(); + /* + * reserve decompressor memory together with decompression heap, buffer and + * memory which might be occupied by uncompressed kernel at default 1Mb + * position (if KASLR is off or failed). + */ + physmem_reserve(RR_DECOMPRESSOR, 0, safe_addr); + if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && parmarea.initrd_size) + physmem_reserve(RR_INITRD, parmarea.initrd_start, parmarea.initrd_size); oldmem_data.start = parmarea.oldmem_base; oldmem_data.size = parmarea.oldmem_size; - setup_lpp(); store_ipl_parmblock(); - safe_addr = mem_safe_offset(); - safe_addr = reserve_amode31(safe_addr); - safe_addr = read_ipl_report(safe_addr); + read_ipl_report(); uv_query_info(); - safe_addr = rescue_initrd(safe_addr); sclp_early_read_info(); setup_boot_command_line(); parse_boot_command_line(); detect_facilities(); sanitize_prot_virt_host(); - max_physmem_end = detect_memory(&safe_addr); + max_physmem_end = detect_max_physmem_end(); setup_ident_map_size(max_physmem_end); setup_vmalloc_size(); asce_limit = setup_kernel_memory_layout(); + /* got final ident_map_size, physmem allocations could be performed now */ physmem_set_usable_limit(ident_map_size); + detect_physmem_online_ranges(max_physmem_end); + save_ipl_cert_comp_list(); + rescue_initrd(safe_addr, ident_map_size); +#ifdef CONFIG_KASAN + physmem_alloc_top_down(RR_KASAN, kasan_estimate_memory_needs(get_physmem_usable_total()), + _SEGMENT_SIZE); +#endif if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_enabled) { - random_lma = get_random_base(safe_addr); + random_lma = get_random_base(); if (random_lma) { __kaslr_offset = random_lma - vmlinux.default_lma; img = (void *)vmlinux.default_lma; @@ -317,8 +324,16 @@ void startup_kernel(void) if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) { img = decompress_kernel(); memmove((void *)vmlinux.default_lma, img, vmlinux.image_size); - } else if (__kaslr_offset) + } else if (__kaslr_offset) { memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size); + memset(img, 0, vmlinux.image_size); + } + + /* vmlinux decompression is done, shrink reserved low memory */ + physmem_reserve(RR_DECOMPRESSOR, 0, (unsigned long)_decompressor_end); + if (!__kaslr_offset) + physmem_reserve(RR_VMLINUX, vmlinux.default_lma, vmlinux.image_size + vmlinux.bss_size); + physmem_alloc_range(RR_AMODE31, vmlinux.amode31_size, PAGE_SIZE, 0, SZ_2G, true); /* * The order of the following operations is important: @@ -338,16 +353,11 @@ void startup_kernel(void) setup_vmem(asce_limit); copy_bootdata(); - if (__kaslr_offset) { - /* - * Save KASLR offset for early dumps, before vmcore_info is set. - * Mark as uneven to distinguish from real vmcore_info pointer. - */ - S390_lowcore.vmcore_info = __kaslr_offset | 0x1UL; - /* Clear non-relocated kernel */ - if (IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) - memset(img, 0, vmlinux.image_size); - } + /* + * Save KASLR offset for early dumps, before vmcore_info is set. + * Mark as uneven to distinguish from real vmcore_info pointer. + */ + S390_lowcore.vmcore_info = __kaslr_offset ? __kaslr_offset | 0x1UL : 0; /* * Jump to the decompressed kernel entry point and switch DAT mode on. |