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scripts/gdb: set vabits_actual based on TCR_EL1

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We encounter the following issue after commit 9cce9c6c2c ("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@canonical.com
Fixes: 9cce9c6c2c ("arm64: mm: Handle LVA support as a CPU feature")
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>
This commit is contained in:
Kuan-Ying Lee 2024-06-19 15:49:09 +08:00 committed by Andrew Morton
parent 3c0e9a2004
commit 04a40baec0
1 changed files with 3 additions and 1 deletions
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4
scripts/gdb/linux/mm.py
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@ -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