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s390/page table dumper: add support for change-recording override bit 

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-02-16 11:47:27 +01:00 committed by Martin Schwidefsky
parent 2a7d2b96d5
commit 1819ed1f06
2 changed files with 22 additions and 5 deletions
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2
arch/s390/include/asm/pgtable.h
View File

@ -340,6 +340,8 @@ extern unsigned long MODULES_END;
#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV) #define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
#define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */ #define _REGION3_ENTRY_LARGE 0x400 /* RTTE-format control, large page */
#define _REGION3_ENTRY_RO 0x200 /* page protection bit */
#define _REGION3_ENTRY_CO 0x100 /* change-recording override */
/* Bits in the segment table entry */ /* Bits in the segment table entry */
#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */ #define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */

25
arch/s390/mm/dump_pagetables.c
View File

@ -49,10 +49,13 @@ static void print_prot(struct seq_file *m, unsigned int pr, int level)
{ "ASCE", "PGD", "PUD", "PMD", "PTE" }; { "ASCE", "PGD", "PUD", "PMD", "PTE" };
seq_printf(m, "%s ", level_name[level]); seq_printf(m, "%s ", level_name[level]);
if (pr & _PAGE_INVALID) if (pr & _PAGE_INVALID) {
seq_printf(m, "I\n"); seq_printf(m, "I\n");
else return;
seq_printf(m, "%s\n", pr & _PAGE_RO ? "RO" : "RW"); }
seq_printf(m, "%s", pr & _PAGE_RO ? "RO " : "RW ");
seq_printf(m, "%s", pr & _PAGE_CO ? "CO " : " ");
seq_putc(m, '\n');
} }
static void note_page(struct seq_file *m, struct pg_state *st, static void note_page(struct seq_file *m, struct pg_state *st,
@ -125,6 +128,12 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st,
} }
} }
#ifdef CONFIG_64BIT
#define _PMD_PROT_MASK (_SEGMENT_ENTRY_RO | _SEGMENT_ENTRY_CO)
#else
#define _PMD_PROT_MASK 0
#endif
static void walk_pmd_level(struct seq_file *m, struct pg_state *st, static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
pud_t *pud, unsigned long addr) pud_t *pud, unsigned long addr)
{ {
@ -137,7 +146,7 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
pmd = pmd_offset(pud, addr); pmd = pmd_offset(pud, addr);
if (!pmd_none(*pmd)) { if (!pmd_none(*pmd)) {
if (pmd_large(*pmd)) { if (pmd_large(*pmd)) {
prot = pmd_val(*pmd) & _SEGMENT_ENTRY_RO; prot = pmd_val(*pmd) & _PMD_PROT_MASK;
note_page(m, st, prot, 3); note_page(m, st, prot, 3);
} else } else
walk_pte_level(m, st, pmd, addr); walk_pte_level(m, st, pmd, addr);
@ -147,6 +156,12 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st,
} }
} }
#ifdef CONFIG_64BIT
#define _PUD_PROT_MASK (_REGION3_ENTRY_RO | _REGION3_ENTRY_CO)
#else
#define _PUD_PROT_MASK 0
#endif
static void walk_pud_level(struct seq_file *m, struct pg_state *st, static void walk_pud_level(struct seq_file *m, struct pg_state *st,
pgd_t *pgd, unsigned long addr) pgd_t *pgd, unsigned long addr)
{ {
@ -159,7 +174,7 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st,
pud = pud_offset(pgd, addr); pud = pud_offset(pgd, addr);
if (!pud_none(*pud)) if (!pud_none(*pud))
if (pud_large(*pud)) { if (pud_large(*pud)) {
prot = pud_val(*pud) & _PAGE_RO; prot = pud_val(*pud) & _PUD_PROT_MASK;
note_page(m, st, prot, 2); note_page(m, st, prot, 2);
} else } else
walk_pmd_level(m, st, pud, addr); walk_pmd_level(m, st, pud, addr);