[PATCH V2] riscv: mm: Fixup no5lvl failure when vaddr is invalid

[guoren at kernel.org]

From: "Guo Ren (Alibaba DAMO Academy)" <guoren at kernel.org>

Unlike no4lvl, no5lvl still continues detect satp, which
requires va=pa mapping. When pa=0x800000000000, no5lvl
would fail in Sv48 mode due to an illegal VA value of
0x800000000000.

So, prevent detecting the satp flow for no5lvl, when
vaddr is invalid. Add the is_vaddr_valid() function for
checking.

Fixes: 26e7aacb83df ("riscv: Allow to downgrade paging mode from the command line")
Cc: Alexandre Ghiti <alexghiti at rivosinc.com>
Cc: Björn Töpel <bjorn at rivosinc.com>
Signed-off-by: Guo Ren (Alibaba DAMO Academy) <guoren at kernel.org>
---
Changelog:

v2:
 - Use is_vaddr_valid() instead of simple return.
 - Don't change the original no5lvl code logic.

v1:
https://lore.kernel.org/linux-riscv/20260118145441.291302-1-guoren@kernel.org/
---
 arch/riscv/mm/init.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index addb8a9305be..bfea9f73e703 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -852,6 +852,27 @@ static void __init set_mmap_rnd_bits_max(void)
 	mmap_rnd_bits_max = MMAP_VA_BITS - PAGE_SHIFT - 3;
 }
 
+static bool __init is_vaddr_valid(unsigned long va)
+{
+	unsigned long up = 0;
+
+	switch (satp_mode) {
+	case SATP_MODE_39:
+		up = 1UL << 38;
+		break;
+	case SATP_MODE_48:
+		up = 1UL << 47;
+		break;
+	case SATP_MODE_57:
+		up = 1UL << 56;
+		break;
+	default:
+		return false;
+	}
+
+	return (va < up) || (va >= (ULONG_MAX - up + 1));
+}
+
 /*
  * There is a simple way to determine if 4-level is supported by the
  * underlying hardware: establish 1:1 mapping in 4-level page table mode
@@ -893,6 +914,9 @@ static __init void set_satp_mode(uintptr_t dtb_pa)
 			   set_satp_mode_pmd + PMD_SIZE,
 			   PMD_SIZE, PAGE_KERNEL_EXEC);
 retry:
+	if (!is_vaddr_valid(set_satp_mode_pmd))
+		goto out;
+
 	create_pgd_mapping(early_pg_dir,
 			   set_satp_mode_pmd,
 			   pgtable_l5_enabled ?
@@ -915,6 +939,7 @@ static __init void set_satp_mode(uintptr_t dtb_pa)
 		disable_pgtable_l4();
 	}
 
+out:
 	memset(early_pg_dir, 0, PAGE_SIZE);
 	memset(early_p4d, 0, PAGE_SIZE);
 	memset(early_pud, 0, PAGE_SIZE);
-- 
2.40.1