The patch titled
Subject: scripts/gdb: set vabits_actual based on TCR_EL1
has been added to the -mm mm-nonmm-unstable branch. Its filename is
scripts-gdb-set-vabits_actual-based-on-tcr_el1.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/scripts-gdb-set-vabits_actual-based-on-tcr_el1.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Kuan-Ying Lee <kuan-ying.lee@xxxxxxxxxxxxx>
Subject: scripts/gdb: set vabits_actual based on TCR_EL1
Date: Wed, 19 Jun 2024 15:49:09 +0800
We encounter the following issue after commit 9cce9c6c2c3b ("arm64: mm: Handle
LVA support as a CPU feature").
(gdb) lx-slabinfo
Python Exception <class 'gdb.error'>: No symbol "vabits_actual" in current context.
Error occurred in Python: No symbol "vabits_actual" in current context.
We set vabits_actual based on TCR_EL1 value when
VA_BITS is bigger than 48.
Link: https://lkml.kernel.org/r/20240619074911.100434-5-kuan-ying.lee@xxxxxxxxxxxxx
Fixes: 9cce9c6c2c3b ("arm64: mm: Handle LVA support as a CPU feature")
Signed-off-by: Kuan-Ying Lee <kuan-ying.lee@xxxxxxxxxxxxx>
Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Cc: Kieran Bingham <kbingham@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
scripts/gdb/linux/mm.py | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/scripts/gdb/linux/mm.py~scripts-gdb-set-vabits_actual-based-on-tcr_el1
+++ a/scripts/gdb/linux/mm.py
@@ -48,7 +48,9 @@ class aarch64_page_ops():
self.VA_BITS = constants.LX_CONFIG_ARM64_VA_BITS
if self.VA_BITS > 48:
self.VA_BITS_MIN = 48
- self.vabits_actual = gdb.parse_and_eval('vabits_actual')
+ 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)
else:
self.VA_BITS_MIN = self.VA_BITS
self.vabits_actual = self.VA_BITS
_
Patches currently in -mm which might be from kuan-ying.lee@xxxxxxxxxxxxx are
scripts-gdb-redefine-max_order-sanely.patch
scripts-gdb-rework-module-va-range.patch
scripts-gdb-change-the-layout-of-vmemmap.patch
scripts-gdb-set-vabits_actual-based-on-tcr_el1.patch
scripts-gdb-change-va_bits_min-when-we-use-16k-page.patch
scripts-gdb-rename-pool_index-to-pool_index_plus_1.patch
