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s390/mm: implement set_memory_4k()

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Implement set_memory_4k() which will split any present large or huge
mapping in the given range to a 4k mapping.

Link: https://lore.kernel.org/r/20210728190254.3921642-2-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-07-28 21:02:51 +02:00
parent 00e67bf030
commit b3e1a00c8f
2 changed files with 18 additions and 2 deletions
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6
arch/s390/include/asm/set_memory.h
View File

@ -10,6 +10,7 @@ extern struct mutex cpa_mutex;
#define SET_MEMORY_RW 2UL
#define SET_MEMORY_NX 4UL
#define SET_MEMORY_X 8UL
#define SET_MEMORY_4K 16UL
int __set_memory(unsigned long addr, int numpages, unsigned long flags);
@ -33,4 +34,9 @@ static inline int set_memory_x(unsigned long addr, int numpages)
return __set_memory(addr, numpages, SET_MEMORY_X);
}
static inline int set_memory_4k(unsigned long addr, int numpages)
{
return __set_memory(addr, numpages, SET_MEMORY_4K);
}
#endif

14
arch/s390/mm/pageattr.c
View File

@ -85,6 +85,8 @@ static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
{
pte_t *ptep, new;
if ((flags & SET_MEMORY_4K) == SET_MEMORY_4K)
return 0;
ptep = pte_offset_kernel(pmdp, addr);
do {
new = *ptep;
@ -155,6 +157,7 @@ static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
unsigned long flags)
{
unsigned long next;
int need_split;
pmd_t *pmdp;
int rc = 0;
@ -164,7 +167,10 @@ static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
return -EINVAL;
next = pmd_addr_end(addr, end);
if (pmd_large(*pmdp)) {
if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
need_split = !!(flags & SET_MEMORY_4K);
need_split |= !!(addr & ~PMD_MASK);
need_split |= !!(addr + PMD_SIZE > next);
if (need_split) {
rc = split_pmd_page(pmdp, addr);
if (rc)
return rc;
@ -232,6 +238,7 @@ static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
unsigned long flags)
{
unsigned long next;
int need_split;
pud_t *pudp;
int rc = 0;
@ -241,7 +248,10 @@ static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
return -EINVAL;
next = pud_addr_end(addr, end);
if (pud_large(*pudp)) {
if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
need_split = !!(flags & SET_MEMORY_4K);
need_split |= !!(addr & ~PUD_MASK);
need_split |= !!(addr + PUD_SIZE > next);
if (need_split) {
rc = split_pud_page(pudp, addr);
if (rc)
break;