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s390/boot: Uncouple virtual and physical kernel offsets

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

Currently __kaslr_offset is the kernel offset in both
physical memory on boot and in virtual memory after DAT
mode is enabled.

Uncouple these offsets and rename the physical address
space variant to __kaslr_offset_phys while keep the name
__kaslr_offset for the offset in virtual address space.

Do not use __kaslr_offset_phys after DAT mode is enabled
just yet, but still make it a persistent boot variable
for later use.

Use __kaslr_offset and __kaslr_offset_phys offsets in
proper contexts and alter handle_relocs() function to
distinguish between the two.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Alexander Gordeev
2024-02-20 14:35:43 +01:00
parent 236f324b74
commit 3bb11234b1
4 changed files with 20 additions and 9 deletions
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2
arch/s390/include/asm/page.h
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@@ -180,12 +180,14 @@ int arch_make_page_accessible(struct page *page);
struct vm_layout {
unsigned long kaslr_offset;
unsigned long kaslr_offset_phys;
unsigned long identity_size;
};
extern struct vm_layout vm_layout;
#define __kaslr_offset vm_layout.kaslr_offset
#define __kaslr_offset_phys vm_layout.kaslr_offset_phys
#define ident_map_size vm_layout.identity_size
static inline unsigned long kaslr_offset(void)