[PATCH v4 1/5] arm64: mte: Add asynchronous mode support

[Catalin Marinas]

On Mon, Jan 18, 2021 at 06:30:29PM +0000, Vincenzo Frascino wrote:
> MTE provides an asynchronous mode for detecting tag exceptions. In
> particular instead of triggering a fault the arm64 core updates a
> register which is checked by the kernel after the asynchronous tag
> check fault has occurred.
> 
> Add support for MTE asynchronous mode.
> 
> The exception handling mechanism will be added with a future patch.
> 
> Note: KASAN HW activates async mode via kasan.mode kernel parameter.
> The default mode is set to synchronous.
> The code that verifies the status of TFSR_EL1 will be added with a
> future patch.
> 
> Cc: Catalin Marinas <catalin.marinas at arm.com>
> Cc: Will Deacon <will at kernel.org>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino at arm.com>

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