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/test-bug.h | 97 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 include/kunit/test-bug.h (limited to 'include/kunit/test-bug.h') diff --git a/include/kunit/test-bug.h b/include/kunit/test-bug.h new file mode 100644 index 000000000..99869029f --- /dev/null +++ b/include/kunit/test-bug.h @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * KUnit API providing hooks for non-test code to interact with tests. + * + * Copyright (C) 2020, Google LLC. + * Author: Uriel Guajardo + */ + +#ifndef _KUNIT_TEST_BUG_H +#define _KUNIT_TEST_BUG_H + +#include /* for NULL */ +#include /* for bool */ + +#if IS_ENABLED(CONFIG_KUNIT) + +#include /* For static branch */ +#include + +/* Static key if KUnit is running any tests. */ +DECLARE_STATIC_KEY_FALSE(kunit_running); + +/* Hooks table: a table of function pointers filled in when kunit loads */ +extern struct kunit_hooks_table { + __printf(3, 4) void (*fail_current_test)(const char*, int, const char*, ...); + void *(*get_static_stub_address)(struct kunit *test, void *real_fn_addr); + bool (*is_suppressed_warning)(bool count); +} kunit_hooks; + +/** + * kunit_get_current_test() - Return a pointer to the currently running + * KUnit test. + * + * If a KUnit test is running in the current task, returns a pointer to its + * associated struct kunit. This pointer can then be passed to any KUnit + * function or assertion. If no test is running (or a test is running in a + * different task), returns NULL. + * + * This function is safe to call even when KUnit is disabled. If CONFIG_KUNIT + * is not enabled, it will compile down to nothing and will return quickly no + * test is running. + */ +static inline struct kunit *kunit_get_current_test(void) +{ + if (!static_branch_unlikely(&kunit_running)) + return NULL; + + return current->kunit_test; +} + + +/** + * kunit_fail_current_test() - If a KUnit test is running, fail it. + * + * If a KUnit test is running in the current task, mark that test as failed. + */ +#define kunit_fail_current_test(fmt, ...) do { \ + if (static_branch_unlikely(&kunit_running)) { \ + /* Guaranteed to be non-NULL when kunit_running true*/ \ + kunit_hooks.fail_current_test(__FILE__, __LINE__, \ + fmt, ##__VA_ARGS__); \ + } \ + } while (0) + +/** + * kunit_is_suppressed_warning() - Check if warnings are being suppressed + * by the current KUnit test. + * @count: if true, increment the suppression counter on match. + * + * Returns true if the current task has active warning suppression. + * Uses the kunit_running static branch for zero overhead when no tests run. + * + * A single WARN*() may traverse multiple call sites in the warning path + * (e.g., __warn_printk() and __report_bug()). Pass @count = true at the + * primary suppression point to count each warning exactly once, and + * @count = false at secondary points to suppress output without + * inflating the count. + */ +static inline bool kunit_is_suppressed_warning(bool count) +{ + if (!static_branch_unlikely(&kunit_running)) + return false; + + return kunit_hooks.is_suppressed_warning && + kunit_hooks.is_suppressed_warning(count); +} + +#else + +static inline struct kunit *kunit_get_current_test(void) { return NULL; } +static inline bool kunit_is_suppressed_warning(bool count) { return false; } + +#define kunit_fail_current_test(fmt, ...) do {} while (0) + +#endif + +#endif /* _KUNIT_TEST_BUG_H */ -- cgit v1.3.1