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s390/boot: Allow KASAN mapping to fallback to small pages

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For KASAN shadow mappings, switch from physmem_alloc_or_die() to
physmem_alloc() and return INVALID_PHYS_ADDR on allocation failure. This
allows gracefully falling back from large pages to smaller pages (1MB
or 4KB) if the allocation of 2GB size/aligned pages cannot be fulfilled.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Vasily Gorbik
2024-12-10 11:18:32 +01:00
committed by Alexander Gordeev
parent aeb4358a52
commit 490a5e99ea
1 changed files with 7 additions and 3 deletions
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10
arch/s390/boot/vmem.c
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@@ -247,9 +247,13 @@ static unsigned long resolve_pa_may_alloc(unsigned long addr, unsigned long size
return __identity_pa(addr);
#ifdef CONFIG_KASAN
case POPULATE_KASAN_MAP_SHADOW:
addr = physmem_alloc_or_die(RR_VMEM, size, size);
memset((void *)addr, 0, size);
return addr;
/* Allow to fail large page allocations, this will fall back to 1mb/4k pages */
addr = physmem_alloc(RR_VMEM, size, size, size == PAGE_SIZE);
if (addr) {
memset((void *)addr, 0, size);
return addr;
}
return INVALID_PHYS_ADDR;
#endif
default:
return INVALID_PHYS_ADDR;