linux-kernel - Re: [RFC PATCH v2 4/6] kvm: arm64: Add support for get

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Date:   Sat, 1 Apr 2023 10:28:21 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     David Dai <davidai@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>
Cc:     Saravana Kannan <saravanak@...gle.com>, kernel-team@...roid.com,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.linux.dev
Subject: Re: [RFC PATCH v2 4/6] kvm: arm64: Add support for get_freqtbl
 service

On Thu, Mar 30, 2023 at 06:43:48PM -0700, David Dai wrote:
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 38ce33564efc..8f905456e2b4 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -8400,6 +8400,14 @@ after normalizing for architecture. This is useful when guests are tracking
>  workload on its vCPUs. Util hints allow the host to make more accurate
>  frequency selections and task placement for vCPU threads.
>  
> +8.42 KVM_CAP_GET_CPUFREQ_TBL
> +---------------------------
> +
> +:Architectures: arm64
> +
> +This capability indicates that the KVM supports getting the
> +frequency table of the current CPU that the vCPU thread is running on.
> +
>  9. Known KVM API problems
>  =========================
>  
> diff --git a/Documentation/virt/kvm/arm/get_freqtbl.rst b/Documentation/virt/kvm/arm/get_freqtbl.rst
> new file mode 100644
> index 000000000000..f6832d7566e7
> --- /dev/null
> +++ b/Documentation/virt/kvm/arm/get_freqtbl.rst
> @@ -0,0 +1,23 @@
> +.. SPDX-License-Identifier: GPL-2.0
> +
> +get_freqtbl support for arm/arm64
> +=============================
> +
> +Allows guest to query the frequency(in KHz) table of the current CPU that
> +the vCPU thread is running on.
> +
> +* ARM_SMCCC_VENDOR_HYP_KVM_GET_CPUFREQ_TBL_FUNC_ID: 0x86000042
> +
> +This hypercall uses the SMC32/HVC32 calling convention:
> +
> +ARM_SMCCC_VENDOR_HYP_KVM_GET_CPUFREQ_TBL_FUNC_ID
> +    ==============    ========    =====================================
> +    Function ID:      (uint32)    0x86000042
> +    Arguments:        (uint32)    index of the current CPU's frequency table
> +    Return Values:    (int32)     NOT_SUPPORTED(-1) on error, or
> +                      (uint32)    Frequency table entry of requested index
> +                                  in KHz
> +                                  of current CPU(r1)
> +    Endianness:                   Must be the same endianness
> +                                  as the host.
> +    ==============    ========    =====================================

Sphinx reports htmldocs warnings:
/home/bagas/repo/linux-kernel/Documentation/virt/kvm/api.rst:8404: WARNING: Title underline too short.

8.42 KVM_CAP_GET_CPUFREQ_TBL
---------------------------
/home/bagas/repo/linux-kernel/Documentation/virt/kvm/api.rst:8404: WARNING: Title underline too short.

8.42 KVM_CAP_GET_CPUFREQ_TBL
---------------------------
/home/bagas/repo/linux-kernel/Documentation/virt/kvm/arm/get_freqtbl.rst:4: WARNING: Title underline too short.

get_freqtbl support for arm/arm64
=============================

I have applied the fixup:

---- >8 ----
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index baf8a4c43b5839..3579c470375938 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -8401,7 +8401,7 @@ workload on its vCPUs. Util hints allow the host to make more accurate
 frequency selections and task placement for vCPU threads.
 
 8.42 KVM_CAP_GET_CPUFREQ_TBL
----------------------------
+----------------------------
 
 :Architectures: arm64
 
diff --git a/Documentation/virt/kvm/arm/get_freqtbl.rst b/Documentation/virt/kvm/arm/get_freqtbl.rst
index f6832d7566e7e5..215bf0f653e461 100644
--- a/Documentation/virt/kvm/arm/get_freqtbl.rst
+++ b/Documentation/virt/kvm/arm/get_freqtbl.rst
@@ -1,7 +1,7 @@
 .. SPDX-License-Identifier: GPL-2.0
 
 get_freqtbl support for arm/arm64
-=============================
+=================================
 
 Allows guest to query the frequency(in KHz) table of the current CPU that
 the vCPU thread is running on.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara