arm64/ptdump: Test both PTE_TABLE_BIT and PTE_VALID for block mappings

Test both PTE_TABLE_BIT and PTE_VALID for block mappings, similar to KVM S2
ptdump. This ensures consistency in identifying block mappings, both in the
S1 and the S2 page tables. Besides being kernel page tables, there will not
be any unmapped (!PTE_VALID) block mappings.

Cc: Will Deacon <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Ryan Roberts <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Anshuman Khandual <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

Author: Anshuman Khandual

arch/arm64/mm/ptdump.c

@@ -80,10 +80,10 @@ static const struct ptdump_prot_bits pte_bits[] = {
 		.set	= "CON",
 		.clear	= "   ",
 	}, {
-		.mask	= PTE_TABLE_BIT,
-		.val	= PTE_TABLE_BIT,
-		.set	= "   ",
-		.clear	= "BLK",
+		.mask	= PTE_TABLE_BIT | PTE_VALID,
+		.val	= PTE_VALID,
+		.set	= "BLK",
+		.clear	= "   ",
 	}, {
 		.mask	= PTE_UXN,
 		.val	= PTE_UXN,