Re: [PATCH v11 09/40] arm64/sme: Early CPU setup for SME

On Mon, Feb 07, 2022 at 03:20:38PM +0000, Mark Brown wrote:

SME requires similar setup to that for SVE: disable traps to EL2 and make sure that the maximum vector length is available to EL1, for SME we have two traps - one for SME itself and one for TPIDR2.

In addition since we currently make no active use of priority control for SCMUs we map all SME priorities lower ELs may configure to 0, the architecture specified minimum priority, to ensure that nothing we manage is able to configure itself to consume excessive resources. This will need to be revisited should there be a need to manage SME priorities at runtime.

Signed-off-by: Mark Brown broonie@kernel.org

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