diff options
Diffstat (limited to 'arch/arm64/kernel/fpsimd.c')
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 40 |
1 files changed, 32 insertions, 8 deletions
diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index 3041e55b1581..eb42b00dce54 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -395,11 +395,37 @@ static void task_fpsimd_load(void) WARN_ON(!system_supports_fpsimd()); WARN_ON(!have_cpu_fpsimd_context()); - /* Check if we should restore SVE first */ - if (IS_ENABLED(CONFIG_ARM64_SVE) && test_thread_flag(TIF_SVE)) { - sve_set_vq(sve_vq_from_vl(task_get_sve_vl(current)) - 1); - restore_sve_regs = true; - restore_ffr = true; + if (system_supports_sve()) { + switch (current->thread.fp_type) { + case FP_STATE_FPSIMD: + /* Stop tracking SVE for this task until next use. */ + if (test_and_clear_thread_flag(TIF_SVE)) + sve_user_disable(); + break; + case FP_STATE_SVE: + if (!thread_sm_enabled(¤t->thread) && + !WARN_ON_ONCE(!test_and_set_thread_flag(TIF_SVE))) + sve_user_enable(); + + if (test_thread_flag(TIF_SVE)) + sve_set_vq(sve_vq_from_vl(task_get_sve_vl(current)) - 1); + + restore_sve_regs = true; + restore_ffr = true; + break; + default: + /* + * This indicates either a bug in + * fpsimd_save() or memory corruption, we + * should always record an explicit format + * when we save. We always at least have the + * memory allocated for FPSMID registers so + * try that and hope for the best. + */ + WARN_ON_ONCE(1); + clear_thread_flag(TIF_SVE); + break; + } } /* Restore SME, override SVE register configuration if needed */ @@ -415,10 +441,8 @@ static void task_fpsimd_load(void) if (thread_za_enabled(¤t->thread)) za_load_state(current->thread.za_state); - if (thread_sm_enabled(¤t->thread)) { - restore_sve_regs = true; + if (thread_sm_enabled(¤t->thread)) restore_ffr = system_supports_fa64(); - } } if (restore_sve_regs) { |