scripts/gdb: change VA_BITS_MIN when we use 16K page

Change VA_BITS_MIN when we use 16K page.

Link: https://lkml.kernel.org/r/20240619074911.100434-6-kuan-ying.lee@canonical.com
Fixes: 9684ec1 ("arm64: Enable LPA2 at boot if supported by the system")
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@canonical.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Author: kylee0215

scripts/gdb/linux/mm.py

@@ -47,7 +47,10 @@ def __init__(self):
 
         self.VA_BITS = constants.LX_CONFIG_ARM64_VA_BITS
         if self.VA_BITS > 48:
-            self.VA_BITS_MIN = 48
+            if constants.LX_CONFIG_ARM64_16K_PAGES:
+                self.VA_BITS_MIN = 47
+            else:
+                self.VA_BITS_MIN = 48
             tcr_el1 = gdb.execute("info registers $TCR_EL1", to_string=True)
             tcr_el1 = int(tcr_el1.split()[1], 16)
             self.vabits_actual = 64 - ((tcr_el1 >> 16) & 63)