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| author | Fuad Tabba <fuad.tabba@linux.dev> | 2026-09-22 19:14:30 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-09-23 12:34:30 +0000 |
| commit | 2bc6b218717b9d08f466f88209251d54bc09b207 (patch) | |
| tree | cb91c941eccb15f94cbec4e96aa3a9c8736b5d66 /drivers/accessibility/Kconfig | |
| download | linux-stable-2bc6b218717b9d08f466f88209251d54bc09b207.tar.gz linux-stable-2bc6b218717b9d08f466f88209251d54bc09b207.zip | |
arm64/boot: Disable trapping of PMZR_EL0 writes to EL2grafted
__init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2.
PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in
HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host
traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The
kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU
driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a
write from EL0 reaches the trap and takes the host down without a panic
message.
Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already
does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9
bits.
Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9")
Cc: stable@vger.kernel.org
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/accessibility/Kconfig')
| -rw-r--r-- | drivers/accessibility/Kconfig | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/accessibility/Kconfig b/drivers/accessibility/Kconfig new file mode 100644 index 000000000..6b2f79d1f --- /dev/null +++ b/drivers/accessibility/Kconfig @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: GPL-2.0 +menuconfig ACCESSIBILITY + bool "Accessibility support" + help + Accessibility handles all special kinds of hardware devices or + software adapters which help people with disabilities (e.g. + blindness) to use computers. + + That includes braille devices, speech synthesis, keyboard + remapping, etc. + + Say Y here to get to see options for accessibility. + This option alone does not add any kernel code. + + If you say N, all options in this submenu will be skipped and disabled. + + If unsure, say N. + +if ACCESSIBILITY +config A11Y_BRAILLE_CONSOLE + bool "Console on braille device" + depends on VT + depends on SERIAL_CORE_CONSOLE + help + Enables console output on a braille device connected to a 8250 + serial port. For now only the VisioBraille device is supported. + + To actually enable it, you need to pass option + console=brl,ttyS0 + to the kernel. Options are the same as for serial console. + + If unsure, say N. + +source "drivers/accessibility/speakup/Kconfig" + +endif # ACCESSIBILITY |