Re: [PATCH v3 17/28] arm64/sve: Preserve SVE registers around kernel-mode NEON use

Catalin Marinas
2017-10-12T10:15:48Z

On Tue, Oct 10, 2017 at 07:38:34PM +0100, Dave P Martin wrote:
> Kernel-mode NEON will corrupt the SVE vector registers, due to the
> way they alias the FPSIMD vector registers in the hardware.
>
> This patch ensures that any live SVE register content for the task
> is saved by kernel_neon_begin(). The data will be restored in the
> usual way on return to userspace.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>