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Ard Biesheuvel 8abf613006 arm64/mm: Override PARange for !LPA2 and use it consistently

commit 62cffa496a upstream.

When FEAT_LPA{,2} are not implemented, the ID_AA64MMFR0_EL1.PARange and
TCR.IPS values corresponding with 52-bit physical addressing are
reserved.

Setting the TCR.IPS field to 0b110 (52-bit physical addressing) has side
effects, such as how the TTBRn_ELx.BADDR fields are interpreted, and so
it is important that disabling FEAT_LPA2 (by overriding the
ID_AA64MMFR0.TGran fields) also presents a PARange field consistent with
that.

So limit the field to 48 bits unless LPA2 is enabled, and update
existing references to use the override consistently.

Fixes: 352b0395b5 ("arm64: Enable 52-bit virtual addressing for 4k and 16k granule configs")
Cc: stable@vger.kernel.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241212081841.2168124-10-ardb+git@google.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2025-02-17 10:05:05 +01:00

.gitignore

arm64: gitignore: ignore relacheck

2024-02-22 21:57:52 +00:00

idreg-override.c

arm64/mm: Override PARange for !LPA2 and use it consistently

2025-02-17 10:05:05 +01:00

kaslr_early.c

arm64: head: Move early kernel mapping routines into C code

2024-02-16 12:42:33 +00:00

Makefile

Makefile: remove redundant tool coverage variables