linux-kernel - Re: [RFC PATCH v4 3/5] psci: Add hvc call service for ptp

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Message-ID: <3586ca5b-7abb-12b2-2368-cbc09fe3777f@cogentembedded.com>
Date:   Fri, 27 Sep 2019 12:20:25 +0300
From:   Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:     Jianyong Wu <jianyong.wu@....com>, netdev@...r.kernel.org,
        yangbo.lu@....com, john.stultz@...aro.org, tglx@...utronix.de,
        pbonzini@...hat.com, sean.j.christopherson@...el.com,
        maz@...nel.org, richardcochran@...il.com, Mark.Rutland@....com,
        Will.Deacon@....com, suzuki.poulose@....com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, kvm@...r.kernel.org,
        Steve.Capper@....com, Kaly.Xin@....com, justin.he@....com,
        nd@....com
Subject: Re: [RFC PATCH v4 3/5] psci: Add hvc call service for ptp_kvm.

Hello!

On 26.09.2019 14:42, Jianyong Wu wrote:

> This patch is the base of ptp_kvm for arm64.
> ptp_kvm modules will call hvc to get this service.
> The service offers real time and counter cycle of host for guest.
> 
> Signed-off-by: Jianyong Wu <jianyong.wu@....com>
> ---
>   include/linux/arm-smccc.h | 12 ++++++++++++
>   virt/kvm/arm/psci.c       | 18 ++++++++++++++++++
>   2 files changed, 30 insertions(+)

[...]
> diff --git a/virt/kvm/arm/psci.c b/virt/kvm/arm/psci.c
> index 0debf49bf259..3f30fc42a5ca 100644
> --- a/virt/kvm/arm/psci.c
> +++ b/virt/kvm/arm/psci.c
[...]
> @@ -431,6 +433,22 @@ int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
>   	case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
>   		val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
>   		break;
> +	/*
> +	 * This will used for virtual ptp kvm clock. three
                     ^ be?                            ^ T

[...]

MBR, Sergei