From 2bc6b218717b9d08f466f88209251d54bc09b207 Mon Sep 17 00:00:00 2001 From: Fuad Tabba Date: Tue, 22 Sep 2026 19:14:30 +0100 Subject: arm64/boot: Disable trapping of PMZR_EL0 writes to EL2 __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 Reviewed-by: Anshuman Khandual Reviewed-by: Oliver Upton Signed-off-by: Will Deacon --- drivers/of/Kconfig | 129 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 129 insertions(+) create mode 100644 drivers/of/Kconfig (limited to 'drivers/of/Kconfig') diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig new file mode 100644 index 000000000..50697cc3b --- /dev/null +++ b/drivers/of/Kconfig @@ -0,0 +1,129 @@ +# SPDX-License-Identifier: GPL-2.0 +config DTC + bool + +config GENERIC_BUILTIN_DTB + bool + +config BUILTIN_DTB_ALL + bool + +menuconfig OF + bool "Device Tree and Open Firmware support" + help + This option enables the device tree infrastructure. + It is automatically selected by platforms that need it or can + be enabled manually for unittests, overlays or + compile-coverage. + +if OF + +config OF_UNITTEST + bool "Device Tree runtime unit tests" + depends on OF_EARLY_FLATTREE + select IRQ_DOMAIN + select OF_RESOLVE + help + This option builds in test cases for the device tree infrastructure + that are executed once at boot time, and the results dumped to the + console. + + This option should only be enabled for a development kernel. The tests + will taint the kernel with TAINT_TEST. The tests will cause ERROR and + WARNING messages to print on the console. The tests will cause stack + traces to print on the console. It is possible that the tests will + leave the devicetree in a corrupted state. + + The unittest output will be verbose. Copy the output to a file + via capturing the console output or via the dmesg command. Process + this file with scripts/dtc/of_unittest_expect to reduce the + verbosity, test whether expected output is present, and to + summarize the results. + + If unsure, say N here. This option is not safe to enable. + +config OF_KUNIT_TEST + tristate "Devicetree KUnit Test" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + help + This option builds KUnit unit tests for device tree infrastructure. + + If unsure, say N here, but this option is safe to enable. + +config OF_ALL_DTBS + bool "Build all Device Tree Blobs" + depends on COMPILE_TEST + select DTC + help + This option builds all possible Device Tree Blobs (DTBs) for the + current architecture. + + If unsure, say N here, but this option is safe to enable. + +config OF_FLATTREE + bool + select DTC + select LIBFDT + select CRC32 + +config OF_EARLY_FLATTREE + def_bool OF && !(SPARC || ALPHA || HEXAGON || M68K || PARISC || S390) + select DMA_DECLARE_COHERENT if HAS_DMA && HAS_IOMEM + select OF_FLATTREE + +config OF_PROMTREE + bool + +config OF_KOBJ + def_bool SYSFS + +# Hardly any platforms need this. It is safe to select, but only do so if you +# need it. +config OF_DYNAMIC + bool "Support for dynamic device trees" if OF_UNITTEST + select OF_KOBJ + help + On some platforms, the device tree can be manipulated at runtime. + While this option is selected automatically on such platforms, you + can enable it manually to improve device tree unit test coverage. + +config OF_ADDRESS + def_bool y + depends on !SPARC && (HAS_IOMEM || UML) + +config OF_IRQ + def_bool y + depends on !SPARC && IRQ_DOMAIN + +config OF_RESERVED_MEM + def_bool OF_EARLY_FLATTREE + +config OF_RESOLVE + bool + +config OF_OVERLAY + bool "Device Tree overlays" + select OF_DYNAMIC + select OF_FLATTREE + select OF_RESOLVE + help + Overlays are a method to dynamically modify part of the kernel's + device tree with dynamically loaded data. + While this option is selected automatically when needed, you can + enable it manually to improve device tree unit test coverage. + +config OF_OVERLAY_KUNIT_TEST + tristate "Device Tree overlay KUnit tests" if !KUNIT_ALL_TESTS + depends on KUNIT + default KUNIT_ALL_TESTS + select DTC + help + This option builds KUnit unit tests for the device tree overlay code. + + If unsure, say N here, but this option is safe to enable. + +config OF_NUMA + bool + +endif # OF -- cgit v1.3.1