[PATCHv2 21/29] x86/dump_pagetables: support 5-level paging
From: Kirill A. Shutemov
Date: Mon Dec 26 2016 - 20:56:14 EST
Simple extension to support one more page table level.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
---
arch/x86/mm/dump_pagetables.c | 49 ++++++++++++++++++++++++++++++++++++-------
1 file changed, 42 insertions(+), 7 deletions(-)
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index ea9c49adaa1f..15670b55861b 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -100,7 +100,8 @@ static struct addr_marker address_markers[] = {
#define PTE_LEVEL_MULT (PAGE_SIZE)
#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
-#define PGD_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
+#define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
+#define PGD_LEVEL_MULT (PTRS_PER_PUD * P4D_LEVEL_MULT)
#define pt_dump_seq_printf(m, to_dmesg, fmt, args...) \
({ \
@@ -326,14 +327,14 @@ static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
#if PTRS_PER_PUD > 1
-static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
+static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr,
unsigned long P)
{
int i;
pud_t *start;
pgprotval_t prot;
- start = (pud_t *) pgd_page_vaddr(addr);
+ start = (pud_t *) p4d_page_vaddr(addr);
for (i = 0; i < PTRS_PER_PUD; i++) {
st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
@@ -353,9 +354,43 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
}
#else
-#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(pgd_val(a)),p)
-#define pgd_large(a) pud_large(__pud(pgd_val(a)))
-#define pgd_none(a) pud_none(__pud(pgd_val(a)))
+#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(p4d_val(a)),p)
+#define p4d_large(a) pud_large(__pud(p4d_val(a)))
+#define p4d_none(a) pud_none(__pud(p4d_val(a)))
+#endif
+
+#if PTRS_PER_P4D > 1
+
+static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
+ unsigned long P)
+{
+ int i;
+ p4d_t *start;
+ pgprotval_t prot;
+
+ start = (p4d_t *) pgd_page_vaddr(addr);
+
+ for (i = 0; i < PTRS_PER_P4D; i++) {
+ st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
+ if (!p4d_none(*start)) {
+ if (p4d_large(*start) || !p4d_present(*start)) {
+ prot = p4d_flags(*start);
+ note_page(m, st, __pgprot(prot), 2);
+ } else {
+ walk_pud_level(m, st, *start,
+ P + i * P4D_LEVEL_MULT);
+ }
+ } else
+ note_page(m, st, __pgprot(0), 2);
+
+ start++;
+ }
+}
+
+#else
+#define walk_p4d_level(m,s,a,p) walk_pud_level(m,s,__p4d(pgd_val(a)),p)
+#define pgd_large(a) p4d_large(__p4d(pgd_val(a)))
+#define pgd_none(a) p4d_none(__p4d(pgd_val(a)))
#endif
static inline bool is_hypervisor_range(int idx)
@@ -400,7 +435,7 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
prot = pgd_flags(*start);
note_page(m, &st, __pgprot(prot), 1);
} else {
- walk_pud_level(m, &st, *start,
+ walk_p4d_level(m, &st, *start,
i * PGD_LEVEL_MULT);
}
} else
--
2.11.0