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>
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 97de120..4a29308 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -340,6 +340,8 @@
#define _REGION3_ENTRY_EMPTY (_REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INV)
#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 */
#define _SEGMENT_ENTRY_ORIGIN ~0x7ffUL/* segment table origin */
diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index 04e4892..3ad65b0 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -49,10 +49,13 @@
{ "ASCE", "PGD", "PUD", "PMD", "PTE" };
seq_printf(m, "%s ", level_name[level]);
- if (pr & _PAGE_INVALID)
+ if (pr & _PAGE_INVALID) {
seq_printf(m, "I\n");
- else
- seq_printf(m, "%s\n", pr & _PAGE_RO ? "RO" : "RW");
+ return;
+ }
+ 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,
@@ -125,6 +128,12 @@
}
}
+#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,
pud_t *pud, unsigned long addr)
{
@@ -137,7 +146,7 @@
pmd = pmd_offset(pud, addr);
if (!pmd_none(*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);
} else
walk_pte_level(m, st, pmd, addr);
@@ -147,6 +156,12 @@
}
}
+#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,
pgd_t *pgd, unsigned long addr)
{
@@ -159,7 +174,7 @@
pud = pud_offset(pgd, addr);
if (!pud_none(*pud))
if (pud_large(*pud)) {
- prot = pud_val(*pud) & _PAGE_RO;
+ prot = pud_val(*pud) & _PUD_PROT_MASK;
note_page(m, st, prot, 2);
} else
walk_pmd_level(m, st, pud, addr);
