From: Marc Zyngier <maz@kernel.org>
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@arm.com, will@kernel.org, suzuki.poulose@arm.com,
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@arm.com, justin.he@arm.com, nd@arm.com
Subject: Re: [PATCH v14 09/10] doc: add ptp_kvm introduction for arm64 support
Date: Fri, 04 Sep 2020 17:18:31 +0100 [thread overview]
Message-ID: <87d031qzvs.wl-maz@kernel.org> (raw)
In-Reply-To: <20200904092744.167655-10-jianyong.wu@arm.com>
On Fri, 04 Sep 2020 10:27:43 +0100,
Jianyong Wu <jianyong.wu@arm.com> wrote:
>
> ptp_kvm implementation depends on hypercall using SMCCC. So we
> introduce a new SMCCC service ID. This doc explain how we define
> and use this new ID.
>
> Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>
> ---
> Documentation/virt/kvm/arm/ptp_kvm.rst | 72 ++++++++++++++++++++++++++
> 1 file changed, 72 insertions(+)
> create mode 100644 Documentation/virt/kvm/arm/ptp_kvm.rst
>
> diff --git a/Documentation/virt/kvm/arm/ptp_kvm.rst b/Documentation/virt/kvm/arm/ptp_kvm.rst
> new file mode 100644
> index 000000000000..455591e2587a
> --- /dev/null
> +++ b/Documentation/virt/kvm/arm/ptp_kvm.rst
> @@ -0,0 +1,72 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +PTP_KVM support for arm64
> +=========================
> +
> +PTP_KVM is used for time sync between guest and host in a high precison.
> +It needs get wall time and counter value from host and transfer these data
> +to guest via hypercall service. So one more hypercall service should be
> +added.
> +
> +This new SMCCC hypercall will be defined as:
> +
> +* ARM_SMCCC_HYP_KVM_PTP_FUNC_ID: 0xC6000001
> +
> +As we only support 64-bits ptp_kvm client, so we choose SMC64/HVC64
> +calling convention.
This isn't what the code does, as it is explicitly set as an SMC32
service... Furthermore, we still run 32bit guests, and will do for the
foreseeable future. Having removed KVM support for 32bit doesn't mean
32bits are gone.
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2020-09-04 16:18 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-04 9:27 [PATCH v14 00/10] Enable ptp_kvm for arm64 Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 01/10] arm64: Probe for the presence of KVM hypervisor services during boot Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 02/10] arm/arm64: KVM: Advertise KVM UID to guests via SMCCC Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 03/10] smccc: Export smccc conduit get helper Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 04/10] ptp: Reorganize ptp_kvm module to make it arch-independent Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 05/10] time: Add mechanism to recognize clocksource in time_get_snapshot Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 06/10] clocksource: Add clocksource id for arm arch counter Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 07/10] arm64/kvm: Add hypercall service for kvm ptp Jianyong Wu
2020-09-04 16:15 ` Marc Zyngier
2020-09-07 8:10 ` Jianyong Wu
2020-09-05 11:04 ` Marc Zyngier
2020-09-07 8:13 ` Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 08/10] ptp: arm64: Enable ptp_kvm for arm64 Jianyong Wu
2020-09-05 11:01 ` Marc Zyngier
2020-09-06 10:00 ` Marc Zyngier
2020-09-07 8:40 ` Jianyong Wu
2020-09-07 8:54 ` Marc Zyngier
2020-09-07 9:28 ` Jianyong Wu
2020-09-07 9:47 ` Marc Zyngier
2020-09-07 10:11 ` Jianyong Wu
2020-09-05 11:33 ` Marc Zyngier
2020-09-07 8:51 ` Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 09/10] doc: add ptp_kvm introduction for arm64 support Jianyong Wu
2020-09-04 16:18 ` Marc Zyngier [this message]
2020-09-07 7:55 ` Jianyong Wu
2020-09-04 9:27 ` [PATCH v14 10/10] arm64: Add kvm capability check extension for ptp_kvm Jianyong Wu
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