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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/dpll/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/dpll/Kconfig')
| -rw-r--r-- | drivers/dpll/Kconfig | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/dpll/Kconfig b/drivers/dpll/Kconfig new file mode 100644 index 000000000..be98969f0 --- /dev/null +++ b/drivers/dpll/Kconfig @@ -0,0 +1,28 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Generic DPLL drivers configuration +# + +menu "DPLL device support" + +config DPLL + bool + +config DPLL_REFCNT_TRACKER + bool "DPLL reference count tracking" + depends on DEBUG_KERNEL && STACKTRACE_SUPPORT && DPLL + select REF_TRACKER + help + Enable reference count tracking for DPLL devices and pins. + This helps debugging reference leaks and use-after-free bugs + by recording stack traces for each get/put operation. + + The tracking information is exposed via debugfs at: + /sys/kernel/debug/ref_tracker/dpll_device_* + /sys/kernel/debug/ref_tracker/dpll_pin_* + + If unsure, say N. + +source "drivers/dpll/zl3073x/Kconfig" + +endmenu |