[PATCH v11 15/40] arm64/sme: Implement SVCR context switching

[Catalin Marinas]

On Mon, Feb 07, 2022 at 03:20:44PM +0000, Mark Brown wrote:
> In SME the use of both streaming SVE mode and ZA are tracked through
> PSTATE.SM and PSTATE.ZA, visible through the system register SVCR.  In
> order to context switch the floating point state for SME we need to
> context switch the contents of this register as part of context
> switching the floating point state.
> 
> Since changing the vector length exits streaming SVE mode and disables
> ZA we also make sure we update SVCR appropriately when setting vector
> length, and similarly ensure that new threads have streaming SVE mode
> and ZA disabled.
> 
> Signed-off-by: Mark Brown <broonie at kernel.org>

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