diff options
| -rw-r--r-- | arch/arm64/include/asm/fpsimd.h | 2 | ||||
| -rw-r--r-- | arch/arm64/kernel/entry-fpsimd.S | 12 | ||||
| -rw-r--r-- | arch/arm64/kernel/fpsimd.c | 6 |
3 files changed, 15 insertions, 5 deletions
diff --git a/arch/arm64/include/asm/fpsimd.h b/arch/arm64/include/asm/fpsimd.h index 2599504674b5..c072161d5c65 100644 --- a/arch/arm64/include/asm/fpsimd.h +++ b/arch/arm64/include/asm/fpsimd.h @@ -69,7 +69,7 @@ static inline void *sve_pffr(struct thread_struct *thread) extern void sve_save_state(void *state, u32 *pfpsr); extern void sve_load_state(void const *state, u32 const *pfpsr, unsigned long vq_minus_1); -extern void sve_flush_live(void); +extern void sve_flush_live(unsigned long vq_minus_1); extern void sve_load_from_fpsimd_state(struct user_fpsimd_state const *state, unsigned long vq_minus_1); extern unsigned int sve_get_vl(void); diff --git a/arch/arm64/kernel/entry-fpsimd.S b/arch/arm64/kernel/entry-fpsimd.S index dd8382e5ce82..0a7a64753878 100644 --- a/arch/arm64/kernel/entry-fpsimd.S +++ b/arch/arm64/kernel/entry-fpsimd.S @@ -69,10 +69,18 @@ SYM_FUNC_START(sve_load_from_fpsimd_state) ret SYM_FUNC_END(sve_load_from_fpsimd_state) -/* Zero all SVE registers but the first 128-bits of each vector */ +/* + * Zero all SVE registers but the first 128-bits of each vector + * + * VQ must already be configured by caller, any further updates of VQ + * will need to ensure that the register state remains valid. + * + * x0 = VQ - 1 + */ SYM_FUNC_START(sve_flush_live) + cbz x0, 1f // A VQ-1 of 0 is 128 bits so no extra Z state sve_flush_z - sve_flush_p_ffr +1: sve_flush_p_ffr ret SYM_FUNC_END(sve_flush_live) diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c index ad3dd34a83cf..e57b23f95284 100644 --- a/arch/arm64/kernel/fpsimd.c +++ b/arch/arm64/kernel/fpsimd.c @@ -957,8 +957,10 @@ void do_sve_acc(unsigned int esr, struct pt_regs *regs) * disabling the trap, otherwise update our in-memory copy. */ if (!test_thread_flag(TIF_FOREIGN_FPSTATE)) { - sve_set_vq(sve_vq_from_vl(current->thread.sve_vl) - 1); - sve_flush_live(); + unsigned long vq_minus_one = + sve_vq_from_vl(current->thread.sve_vl) - 1; + sve_set_vq(vq_minus_one); + sve_flush_live(vq_minus_one); fpsimd_bind_task_to_cpu(); } else { fpsimd_to_sve(current); |