RE: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64

Jianyong Wu
2020-01-10T10:16:17Z

Hi Marc,

> -----Original Message-----
> From: Marc Zyngier <maz@kernel.org>
> Sent: Thursday, January 9, 2020 5:46 PM
> To: Jianyong Wu <Jianyong.Wu@arm.com>
> Cc: netdev@vger.kernel.org; yangbo.lu@nxp.com; john.stultz@linaro.org;
> tglx@linutronix.de; pbonzini@redhat.com; sean.j.christopherson@intel.com;
> richardcochran@gmail.com; Mark Rutland <Mark.Rutland@arm.com>;
> will@kernel.org; Suzuki Poulose <Suzuki.Poulose@arm.com>; Steven Price
> <Steven.Price@arm.com>; linux-kernel@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; kvmarm@lists.cs.columbia.edu;
> kvm@vger.kernel.org; Steve Capper <Steve.Capper@arm.com>; Kaly Xin
> <Kaly.Xin@arm.com>; Justin He <Justin.He@arm.com>; nd <nd@arm.com>;
> kvm-owner@vger.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).
>
Get it

Thanks
Jianyong

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