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OpenCloudOS-Kernel
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s390/boot: do not change default_lma 

The current modification of the default_lma is illogical and should be
avoided. It would be more appropriate to introduce and utilize a new
variable vmlinux_lma instead, so that default_lma remains unchanged and
at its original "default" value of 0x100000.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2023-03-15 10:19:57 +01:00
parent 26300860c2
commit a1d2d9cbaf
1 changed files with 12 additions and 13 deletions
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25
arch/s390/boot/startup.c
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@ -235,9 +235,9 @@ static unsigned long setup_kernel_memory_layout(void)
/*
* This function clears the BSS section of the decompressed Linux kernel and NOT the decompressor's.
*/
static void clear_bss_section(void)
static void clear_bss_section(unsigned long vmlinux_lma)
{
memset((void *)vmlinux.default_lma + vmlinux.image_size, 0, vmlinux.bss_size);
memset((void *)vmlinux_lma + vmlinux.image_size, 0, vmlinux.bss_size);
}
/*
@ -256,7 +256,6 @@ static void setup_vmalloc_size(void)
static void offset_vmlinux_info(unsigned long offset)
{
vmlinux.default_lma += offset;
*(unsigned long *)(&vmlinux.entry) += offset;
vmlinux.bootdata_off += offset;
vmlinux.bootdata_preserved_off += offset;
@ -278,7 +277,7 @@ static void offset_vmlinux_info(unsigned long offset)
void startup_kernel(void)
{
unsigned long max_physmem_end;
unsigned long random_lma;
unsigned long vmlinux_lma = 0;
unsigned long asce_limit;
unsigned long safe_addr;
void *img;
@ -316,26 +315,26 @@ void startup_kernel(void)
rescue_initrd(safe_addr, ident_map_size);
if (kaslr_enabled()) {
random_lma = get_random_base();
if (random_lma) {
__kaslr_offset = random_lma - vmlinux.default_lma;
img = (void *)vmlinux.default_lma;
vmlinux_lma = get_random_base();
if (vmlinux_lma) {
__kaslr_offset = vmlinux_lma - vmlinux.default_lma;
offset_vmlinux_info(__kaslr_offset);
}
}
vmlinux_lma = vmlinux_lma ?: vmlinux.default_lma;
physmem_reserve(RR_VMLINUX, vmlinux_lma, vmlinux.image_size + vmlinux.bss_size);
if (!IS_ENABLED(CONFIG_KERNEL_UNCOMPRESSED)) {
img = decompress_kernel();
memmove((void *)vmlinux.default_lma, img, vmlinux.image_size);
memmove((void *)vmlinux_lma, img, vmlinux.image_size);
} else if (__kaslr_offset) {
memcpy((void *)vmlinux.default_lma, img, vmlinux.image_size);
img = (void *)vmlinux.default_lma;
memmove((void *)vmlinux_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);
/*
@ -351,7 +350,7 @@ void startup_kernel(void)
* - copy_bootdata() must follow setup_vmem() to propagate changes to
* bootdata made by setup_vmem()
*/
clear_bss_section();
clear_bss_section(vmlinux_lma);
handle_relocs(__kaslr_offset);
setup_vmem(asce_limit);
copy_bootdata();