linux-kernel - Re: [PATCH v1 2/6] dt-bindings: hypervisor: Add binding for MediaTek GenieZone hypervisor

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Date:   Fri, 14 Apr 2023 08:35:54 +0000
From:   Yi-De Wu (吳一德) <Yi-De.Wu@...iatek.com>
To:     "corbet@....net" <corbet@....net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski@...aro.org" <krzysztof.kozlowski@...aro.org>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        Yingshiuan Pan (潘穎軒) 
        <Yingshiuan.Pan@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "will@...nel.org" <will@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        MY Chuang (莊明躍) <MY.Chuang@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        PeiLun Suei (隋培倫) 
        <PeiLun.Suei@...iatek.com>,
        Liju-clr Chen (陳麗如) 
        <Liju-clr.Chen@...iatek.com>,
        Jades Shih (施向玨) 
        <jades.shih@...iatek.com>,
        "dbrazdil@...gle.com" <dbrazdil@...gle.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Shawn Hsiao (蕭志祥) 
        <shawn.hsiao@...iatek.com>,
        Miles Chen (陳民樺) 
        <Miles.Chen@...iatek.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Ivan Tseng (曾志軒) 
        <ivan.tseng@...iatek.com>,
        Ze-yu Wang (王澤宇) 
        <Ze-yu.Wang@...iatek.com>
Subject: Re: [PATCH v1 2/6] dt-bindings: hypervisor: Add binding for MediaTek
 GenieZone hypervisor

On Thu, 2023-04-13 at 15:05 +0200, Krzysztof Kozlowski wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 13/04/2023 11:07, Yi-De Wu wrote:
> > From: "Yingshiuan Pan" <yingshiuan.pan@...iatek.com>
> > 
> > Add documentation for GenieZone(gzvm) node. This node informs gzvm
> > driver to start probing if geniezone hypervisor is available and
> 
> Subject: drop second/last, redundant "binding for". The "dt-bindings"
> prefix is already stating that these are bindings.
> 
Thank you for the review comments. We would remove the "binding for"
wording in the subject on the next version.

> > able to do virtual machine operations.
> > 
> > Signed-off-by: Yingshiuan Pan <yingshiuan.pan@...iatek.com>
> > Signed-off-by: Yi-De Wu <yi-de.wu@...iatek.com>
> > ---
> >  .../bindings/hypervisor/mediatek,gzvm.yaml    | 30
> > +++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/hypervisor/mediatek,gzvm.yaml
> > 
> > diff --git
> > a/Documentation/devicetree/bindings/hypervisor/mediatek,gzvm.yaml
> > b/Documentation/devicetree/bindings/hypervisor/mediatek,gzvm.yaml
> > new file mode 100644
> > index 000000000000..35e1e5b18e47
> > --- /dev/null
> > +++
> > b/Documentation/devicetree/bindings/hypervisor/mediatek,gzvm.yaml
> > @@ -0,0 +1,30 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: 
> > https://urldefense.com/v3/__http://devicetree.org/schemas/hypervisor/mediatek,gzvm.yaml*__;Iw!!CTRNKA9wMg0ARbw!lp4d4WBp26cpOeEGcKn_aHcNGfyl1Y--BYzfR8oR_0Xzr9TLvUELfOQAAdqHlLIOra1W_QdjVSJv0-HMpLesJmA3TPJSag$
> > +$schema: 
> > https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!lp4d4WBp26cpOeEGcKn_aHcNGfyl1Y--BYzfR8oR_0Xzr9TLvUELfOQAAdqHlLIOra1W_QdjVSJv0-HMpLesJmDSXil_Qw$
> > +
> > +title: MediaTek GenieZone hypervisor
> > +
> > +maintainers:
> > +  - Yingshiuan Pan <yingshiuan.pan@...iatek.com>
> > +
> > +description:
> > +  GenieZone is MediaTek proprietary hypervisor. This device node
> > informs its
> > +  driver, gzvm, to probe if platform supports running virtual
> > machines.
> 
> Do not describe Linux, we all know how driver binding works, but
> hardware/firmware/hypervisor.
> 
Noted. We would enhance the description on next version.

> I don't know if we actually want to support proprietary hypervisors.
> There can be hundreds of them, one per each SoC manufacturer, and
> they
> can come with many ridiculous ideas.
> 
MediaTek, as a partner of Android, our GenieZone hypervisor has been
one of the backend options under Android Virtualization Framework(AVF)
now.
Thus, we'd like to donate these patches for better supporting the
Linux/Android ecosystem.

Reference link: https://crosvm.dev/book/hypervisors.html#geniezone 

> > +
> > +properties:
> > +  compatible:
> > +    const: mediatek,gzvm
> > +
> > +required:
> > +  - compatible
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    hypervisor {
> > +        compatible = "mediatek,gzvm";
> > +        status = "okay";
> 
> Drop status.
> 
> Best regards,
> Krzysztof
>