Re: [PATCH v2 1/6] arm64: Detect the ARMv8.4 TTL feature

[Catalin Marinas]

On Thu, Apr 23, 2020 at 09:56:51PM +0800, Zhenyu Ye wrote:
> From: Marc Zyngier <maz@xxxxxxxxxx>
> 
> In order to reduce the cost of TLB invalidation, the ARMv8.4 TTL
> feature allows TLBs to be issued with a level allowing for quicker
> invalidation.
> 
> The TTL field indicates the level of page table walk
> holding the leaf entry for the address being invalidated.
> 
> Let's detect the feature for now. Further patches will implement
> its actual usage.
> 
> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> Signed-off-by: Zhenyu Ye <yezhenyu2@xxxxxxxxxx>

Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>