[PATCH v3 26/39] arm64: mte: Add in-kernel tag fault handler

[Catalin Marinas]

On Fri, Sep 25, 2020 at 12:50:33AM +0200, Andrey Konovalov wrote:
> From: Vincenzo Frascino <vincenzo.frascino at arm.com>
> 
> Add the implementation of the in-kernel fault handler.
> 
> When a tag fault happens on a kernel address:
> * MTE is disabled on the current CPU,
> * the execution continues.
> 
> When a tag fault happens on a user address:
> * the kernel executes do_bad_area() and panics.
> 
> The tag fault handler for kernel addresses is currently empty and will be
> filled in by a future commit.
> 
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino at arm.com>
> Co-developed-by: Andrey Konovalov <andreyknvl at google.com>
> Signed-off-by: Andrey Konovalov <andreyknvl at google.com>

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