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s390: make sure vmemmap is top region table entry aligned 

Since commit 29d37e5b82 ("s390/protvirt: add ultravisor initialization")
vmax is adjusted to the ultravisor secure storage limit. This limit is
currently applied when 4-level paging is used. Later vmax is also used
to align vmemmap address to the top region table entry border. When vmax
is set to the ultravisor secure storage limit this is no longer the case.

Instead of changing vmax, make only MODULES_END be affected by the
secure storage limit, so that vmax stays intact for further vmemmap
address alignment.

Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Vasily Gorbik 2020-10-15 10:20:08 +02:00 committed by Heiko Carstens
parent a3453d923e
commit 97b142b740
1 changed files with 6 additions and 5 deletions
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11
arch/s390/kernel/setup.c
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@ -568,13 +568,14 @@ static void __init setup_memory_end(void)
vmax = _REGION2_SIZE; /* 3-level kernel page table */
else
vmax = _REGION1_SIZE; /* 4-level kernel page table */
if (is_prot_virt_host())
adjust_to_uv_max(&vmax);
#ifdef CONFIG_KASAN
vmax = kasan_vmax;
#endif
/* module area is at the end of the kernel address space. */
MODULES_END = vmax;
if (is_prot_virt_host())
adjust_to_uv_max(&MODULES_END);
#ifdef CONFIG_KASAN
vmax = _REGION1_SIZE;
MODULES_END = kasan_vmax;
#endif
MODULES_VADDR = MODULES_END - MODULES_LEN;
VMALLOC_END = MODULES_VADDR;
VMALLOC_START = VMALLOC_END - vmalloc_size;