From: Song Shuai <suagrfillet@xxxxxxxxx>
The pt_level uses CONFIG_PGTABLE_LEVELS to display page table names.
But if page mode is downgraded from kernel cmdline or restricted by
the hardware in 64BIT, it will give a wrong name.
Like, using no4lvl for sv39, ptdump named the 1G-mapping as "PUD"
that should be "PGD":
0xffffffd840000000-0xffffffd900000000 0x00000000c0000000 3G PUD D A G . . W R V
So select "P4D/PUD" or "PGD" via pgtable_l5/4_enabled to correct it.
Fixes: e8a62cc26ddf ("riscv: Implement sv48 support")
Reviewed-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx>
Signed-off-by: Song Shuai <suagrfillet@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230712115740.943324-1-suagrfillet@xxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230830044129.11481-3-palmer@xxxxxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
---
arch/riscv/mm/ptdump.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/riscv/mm/ptdump.c b/arch/riscv/mm/ptdump.c
index 20a9f991a6d7..e9090b38f811 100644
--- a/arch/riscv/mm/ptdump.c
+++ b/arch/riscv/mm/ptdump.c
@@ -384,6 +384,9 @@ static int __init ptdump_init(void)
kernel_ptd_info.base_addr = KERN_VIRT_START;
+ pg_level[1].name = pgtable_l5_enabled ? "P4D" : "PGD";
+ pg_level[2].name = pgtable_l4_enabled ? "PUD" : "PGD";
+
for (i = 0; i < ARRAY_SIZE(pg_level); i++)
for (j = 0; j < ARRAY_SIZE(pte_bits); j++)
pg_level[i].mask |= pte_bits[j].mask;
--
2.42.0
