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s390/mm: define Real Memory Copy size and mask macros

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Make Real Memory Copy area size and mask explicit.
This does not bring any functional change and only
needed for clarity.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2023-08-04 15:39:06 +02:00 committed by Heiko Carstens
parent 8ddccc8a7d
commit a984f27ec2
4 changed files with 9 additions and 5 deletions
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2
arch/s390/boot/startup.c
View file

@ -204,7 +204,7 @@ static unsigned long setup_kernel_memory_layout(void)
/* force vmalloc and modules below kasan shadow */
vmax = min(vmax, KASAN_SHADOW_START);
#endif
__memcpy_real_area = round_down(vmax - PAGE_SIZE, PAGE_SIZE);
__memcpy_real_area = round_down(vmax - MEMCPY_REAL_SIZE, PAGE_SIZE);
__abs_lowcore = round_down(__memcpy_real_area - ABS_LOWCORE_MAP_SIZE,
sizeof(struct lowcore));
MODULES_END = round_down(__abs_lowcore, _SEGMENT_SIZE);

3
arch/s390/include/asm/maccess.h
View file

@ -4,6 +4,9 @@
#include <linux/types.h>
#define MEMCPY_REAL_SIZE PAGE_SIZE
#define MEMCPY_REAL_MASK PAGE_MASK
struct iov_iter;
extern unsigned long __memcpy_real_area;

2
arch/s390/mm/dump_pagetables.c
View file

@ -297,7 +297,7 @@ static int pt_dump_init(void)
address_markers[ABS_LOWCORE_NR].start_address = __abs_lowcore;
address_markers[ABS_LOWCORE_END_NR].start_address = __abs_lowcore + ABS_LOWCORE_MAP_SIZE;
address_markers[MEMCPY_REAL_NR].start_address = __memcpy_real_area;
address_markers[MEMCPY_REAL_END_NR].start_address = __memcpy_real_area + PAGE_SIZE;
address_markers[MEMCPY_REAL_END_NR].start_address = __memcpy_real_area + MEMCPY_REAL_SIZE;
address_markers[VMEMMAP_NR].start_address = (unsigned long) vmemmap;
address_markers[VMEMMAP_END_NR].start_address = (unsigned long)vmemmap + vmemmap_size;
address_markers[VMALLOC_NR].start_address = VMALLOC_START;

7
arch/s390/mm/maccess.c
View file

@ -86,11 +86,12 @@ size_t memcpy_real_iter(struct iov_iter *iter, unsigned long src, size_t count)
void *chunk;
pte_t pte;
BUILD_BUG_ON(MEMCPY_REAL_SIZE != PAGE_SIZE);
while (count) {
phys = src & PAGE_MASK;
offset = src & ~PAGE_MASK;
phys = src & MEMCPY_REAL_MASK;
offset = src & ~MEMCPY_REAL_MASK;
chunk = (void *)(__memcpy_real_area + offset);
len = min(count, PAGE_SIZE - offset);
len = min(count, MEMCPY_REAL_SIZE - offset);
pte = mk_pte_phys(phys, PAGE_KERNEL_RO);
mutex_lock(&memcpy_real_mutex);