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 --- include/kunit/of.h | 121 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 include/kunit/of.h (limited to 'include/kunit/of.h') diff --git a/include/kunit/of.h b/include/kunit/of.h new file mode 100644 index 000000000..75a760a4e --- /dev/null +++ b/include/kunit/of.h @@ -0,0 +1,121 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _KUNIT_OF_H +#define _KUNIT_OF_H + +#include + +struct device_node; + +#ifdef CONFIG_OF + +void of_node_put_kunit(struct kunit *test, struct device_node *node); + +#else + +static inline +void of_node_put_kunit(struct kunit *test, struct device_node *node) +{ + kunit_skip(test, "requires CONFIG_OF"); +} + +#endif /* !CONFIG_OF */ + +#if defined(CONFIG_OF) && defined(CONFIG_OF_OVERLAY) && defined(CONFIG_OF_EARLY_FLATTREE) + +int of_overlay_fdt_apply_kunit(struct kunit *test, void *overlay_fdt, + u32 overlay_fdt_size, int *ovcs_id); +#else + +static inline int +of_overlay_fdt_apply_kunit(struct kunit *test, void *overlay_fdt, + u32 overlay_fdt_size, int *ovcs_id) +{ + kunit_skip(test, "requires CONFIG_OF and CONFIG_OF_OVERLAY and CONFIG_OF_EARLY_FLATTREE for root node"); + return -EINVAL; +} + +#endif + +/** + * __of_overlay_apply_kunit() - Test managed of_overlay_fdt_apply() variant + * @test: test context + * @overlay_begin: start address of overlay to apply + * @overlay_end: end address of overlay to apply + * + * This is mostly internal API. See of_overlay_apply_kunit() for the wrapper + * that makes this easier to use. + * + * Similar to of_overlay_fdt_apply(), except the overlay is managed by the test + * case and is automatically removed with of_overlay_remove() after the test + * case concludes. + * + * Return: 0 on success, negative errno on failure + */ +static inline int __of_overlay_apply_kunit(struct kunit *test, + u8 *overlay_begin, + const u8 *overlay_end) +{ + int unused; + + return of_overlay_fdt_apply_kunit(test, overlay_begin, + overlay_end - overlay_begin, + &unused); +} + +#define of_overlay_begin(overlay_name) __dtbo_##overlay_name##_begin +#define of_overlay_end(overlay_name) __dtbo_##overlay_name##_end + +#define OF_OVERLAY_DECLARE(overlay_name) \ + extern uint8_t of_overlay_begin(overlay_name)[]; \ + extern uint8_t of_overlay_end(overlay_name)[] \ + +/** + * of_overlay_apply_kunit() - Test managed of_overlay_fdt_apply() for built-in overlays + * @test: test context + * @overlay_name: name of overlay to apply + * + * This macro is used to apply a device tree overlay built with the + * cmd_dt_S_dtbo rule in scripts/Makefile.lib that has been compiled into the + * kernel image or KUnit test module. The overlay is automatically removed when + * the test is finished. + * + * Unit tests that need device tree nodes should compile an overlay file with + * @overlay_name\.dtbo.o in their Makefile along with their unit test and then + * load the overlay during their test. The @overlay_name matches the filename + * of the overlay without the dtbo filename extension. If CONFIG_OF_OVERLAY is + * not enabled, the @test will be skipped. + * + * In the Makefile + * + * .. code-block:: none + * + * obj-$(CONFIG_OF_OVERLAY_KUNIT_TEST) += overlay_test.o kunit_overlay_test.dtbo.o + * + * In the test + * + * .. code-block:: c + * + * static void of_overlay_kunit_of_overlay_apply(struct kunit *test) + * { + * struct device_node *np; + * + * KUNIT_ASSERT_EQ(test, 0, + * of_overlay_apply_kunit(test, kunit_overlay_test)); + * + * np = of_find_node_by_name(NULL, "test-kunit"); + * KUNIT_EXPECT_NOT_ERR_OR_NULL(test, np); + * of_node_put(np); + * } + * + * Return: 0 on success, negative errno on failure. + */ +#define of_overlay_apply_kunit(test, overlay_name) \ +({ \ + OF_OVERLAY_DECLARE(overlay_name); \ + \ + __of_overlay_apply_kunit((test), \ + of_overlay_begin(overlay_name), \ + of_overlay_end(overlay_name)); \ +}) + +#endif -- cgit v1.3.1