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s390/mm: Create virtual memory layout structure

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This is a preparatory rework to allow uncoupling virtual
and physical addresses spaces.

Put virtual memory layout information into a structure
to improve code generation when accessing the structure
members, which are currently only ident_map_size and
__kaslr_offset.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Alexander Gordeev 2023-12-02 10:57:15 +01:00
parent bbe72f3902
commit 236f324b74
3 changed files with 12 additions and 5 deletions
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3
arch/s390/boot/startup.c
View File

@ -19,7 +19,7 @@
#include "boot.h"
#include "uv.h"
unsigned long __bootdata_preserved(__kaslr_offset);
struct vm_layout __bootdata_preserved(vm_layout);
unsigned long __bootdata_preserved(__abs_lowcore);
unsigned long __bootdata_preserved(__memcpy_real_area);
pte_t *__bootdata_preserved(memcpy_real_ptep);
@ -30,7 +30,6 @@ unsigned long __bootdata_preserved(vmemmap_size);
unsigned long __bootdata_preserved(MODULES_VADDR);
unsigned long __bootdata_preserved(MODULES_END);
unsigned long __bootdata_preserved(max_mappable);
unsigned long __bootdata(ident_map_size);
u64 __bootdata_preserved(stfle_fac_list[16]);
u64 __bootdata_preserved(alt_stfle_fac_list[16]);

11
arch/s390/include/asm/page.h
View File

@ -178,7 +178,16 @@ int arch_make_page_accessible(struct page *page);
#define HAVE_ARCH_MAKE_PAGE_ACCESSIBLE
#endif
extern unsigned long __kaslr_offset;
struct vm_layout {
unsigned long kaslr_offset;
unsigned long identity_size;
};
extern struct vm_layout vm_layout;
#define __kaslr_offset vm_layout.kaslr_offset
#define ident_map_size vm_layout.identity_size
static inline unsigned long kaslr_offset(void)
{
return __kaslr_offset;

3
arch/s390/kernel/setup.c
View File

@ -146,10 +146,9 @@ static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
unsigned long __bootdata_preserved(max_mappable);
unsigned long __bootdata(ident_map_size);
struct physmem_info __bootdata(physmem_info);
unsigned long __bootdata_preserved(__kaslr_offset);
struct vm_layout __bootdata_preserved(vm_layout);
int __bootdata_preserved(__kaslr_enabled);
unsigned int __bootdata_preserved(zlib_dfltcc_support);
EXPORT_SYMBOL(zlib_dfltcc_support);