linux-kernel - Re: [PATCH v2 3/3] kvm/arm: Align the VMID allocation with the arm64 ASID one

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Message-ID: <43b32e77-52b1-8524-63a1-c99578c2dd1d@arm.com>
Date:   Thu, 22 Jul 2021 16:22:26 +0100
From:   Vladimir Murzin <vladimir.murzin@....com>
To:     Will Deacon <will@...nel.org>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>
Cc:     "jean-philippe@...aro.org" <jean-philippe@...aro.org>,
        "maz@...nel.org" <maz@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linuxarm <linuxarm@...wei.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 3/3] kvm/arm: Align the VMID allocation with the arm64
 ASID one

On 7/22/21 10:50 AM, Will Deacon wrote:
> As an aside: I'm more and more inclined to rip out the CnP stuff given
> that it doesn't appear to being any benefits, but does have some clear
> downsides. Perhaps something for next week.

Can you please clarify what do you mean by "it doesn't appear to being any
benefits"? IIRC, Cortex-A65 implements CnP hint and I've heard that some
payloads seen improvement...

Cheers
Vladimir