[PATCH v4 25/28] arm64/sve: Detect SVE and activate runtime support

[Catalin Marinas]

On Fri, Oct 27, 2017 at 11:51:07AM +0100, Dave P Martin wrote:
> This patch enables detection of hardware SVE support via the
> cpufeatures framework, and reports its presence to the kernel and
> userspace via the new ARM64_SVE cpucap and HWCAP_SVE hwcap
> respectively.
> 
> Userspace can also detect SVE using ID_AA64PFR0_EL1, using the
> cpufeatures MRS emulation.
> 
> When running on hardware that supports SVE, this enables runtime
> kernel support for SVE, and allows user tasks to execute SVE
> instructions and make of the of the SVE-specific user/kernel
> interface extensions implemented by this series.
> 
> Signed-off-by: Dave Martin <Dave.Martin at arm.com>
> Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>
> Cc: Catalin Marinas <catalin.marinas at arm.com>

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