linux-kernel - Re: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp

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Message-ID: <a5f5fc5bf913c9a22923d1a556f511e6@kernel.org>
Date:   Thu, 09 Jan 2020 09:46:14 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Jianyong Wu <Jianyong.Wu@....com>
Cc:     netdev@...r.kernel.org, yangbo.lu@....com, john.stultz@...aro.org,
        tglx@...utronix.de, pbonzini@...hat.com,
        sean.j.christopherson@...el.com, richardcochran@...il.com,
        Mark Rutland <Mark.Rutland@....com>, will@...nel.org,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        Steven Price <Steven.Price@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        Steve Capper <Steve.Capper@....com>,
        Kaly Xin <Kaly.Xin@....com>, Justin He <Justin.He@....com>,
        nd <nd@....com>, kvm-owner@...r.kernel.org
Subject: Re: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64

On 2020-01-09 09:24, Marc Zyngier wrote:
> On 2020-01-09 05:59, Jianyong Wu wrote:

[...]

>> So we focus it on arm64. Also I have never tested it on arm32 machine
>> ( we lack of arm32 machine)
> 
> I'm sure your employer can provide you with such a box. I can probably
> even tell you which cupboard they are stored in... ;-)
> 
>> Do you think it's necessary to enable ptp_kvm on arm32? If so, I can 
>> do that.
> 
> I can't see why we wouldn't, given that it should be a zero effort task
> (none of the code here is arch specific).

To be clear, what I'm after is support for 32bit *guests*. I don't 
expect any
issue with a 32bit host (it's all common code), but you should be able 
to test
32bit guests pretty easily (most ARMv8.0 CPUs support 32bit EL1).

         M.
-- 
Jazz is not dead. It just smells funny...