linux-kernel - Re: [RFC PATCH v1 0/3] arm64: tlb: add support for TTL field

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Date:   Wed, 11 Mar 2020 09:12:54 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Zhenyu Ye <yezhenyu2@...wei.com>
Cc:     mark.rutland@....com, catalin.marinas@....com, will@...nel.org,
        aneesh.kumar@...ux.ibm.com, steven.price@....com,
        broonie@...nel.org, guohanjun@...wei.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org, arm@...nel.org,
        xiexiangyou@...wei.com, prime.zeng@...ilicon.com
Subject: Re: [RFC PATCH v1 0/3] arm64: tlb: add support for TTL field

Zhenyu,

On 2020-03-11 02:53, Zhenyu Ye wrote:
> ARMv8.4-TTL provides the TTL field in tlbi instruction to indicate
> the level of translation table walk holding the leaf entry for the
> address that is being invalidated. Hardware can use this information
> to determine if there was a risk of splintering.
> 
> This set of patches adds TTL field to __TLBI_ADDR, and uses
> Architecture-specific MM context to pass the TTL value to tlb 
> interface.
> 
> The default value of TTL is 0, which will not have any impact on the
> TLB maintenance instructions. The last patch trys to use TTL field in
> some obviously tlb-flush interface.

I have already posted some support for ARMv8.4-TTL as part of my NV 
series [1],
patches 62, 67, 68 and 69. This only deals with Stage-2 translation so 
far.
If you intend to add Stage-1, please build on top of what I have already 
posted
(I can extract the patches on a separate branch if you want).

Thanks,

         M.

[1] 
https://lore.kernel.org/linux-arm-kernel/20200211174938.27809-1-maz@kernel.org/
-- 
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