On Mon, Feb 07, 2022 at 03:20:45PM +0000, Mark Brown wrote: > When in streaming mode we need to save and restore the streaming mode > SVE register state rather than the regular SVE register state. This uses > the streaming mode vector length and omits FFR but is otherwise identical, > if TIF_SVE is enabled when we are in streaming mode then streaming mode > takes precedence. > > This does not handle use of streaming SVE state with KVM, ptrace or > signals. This will be updated in further patches. I think I get this but a state diagram somewhere would help ;). IIUC you don't disable SM on a context switch, you just leave it in place until a task_fpsimd_load(). It shouldn't be a problem as kernel_neon_begin() disables it anyway. Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
