linux-kernel - Re: [PATCH v3 2/7] dt-bindings: hypervisor: Add MediaTek GenieZone hypervisor

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Date:   Thu, 8 Jun 2023 06:11:38 +0000
From:   Yi-De Wu (吳一德) <Yi-De.Wu@...iatek.com>
To:     "conor.dooley@...rochip.com" <conor.dooley@...rochip.com>
CC:     "corbet@....net" <corbet@....net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        MY Chuang (莊明躍) <MY.Chuang@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "quic_tsoni@...cinc.com" <quic_tsoni@...cinc.com>,
        Shawn Hsiao (蕭志祥) 
        <shawn.hsiao@...iatek.com>,
        Miles Chen (陳民樺) 
        <Miles.Chen@...iatek.com>,
        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>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "yipei.chang@...il.com" <yipei.chang@...il.com>,
        "dbrazdil@...gle.com" <dbrazdil@...gle.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Yingshiuan Pan (潘穎軒) 
        <Yingshiuan.Pan@...iatek.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Ze-yu Wang (王澤宇) 
        <Ze-yu.Wang@...iatek.com>, "will@...nel.org" <will@...nel.org>,
        Ivan Tseng (曾志軒) 
        <ivan.tseng@...iatek.com>
Subject: Re: [PATCH v3 2/7] dt-bindings: hypervisor: Add MediaTek GenieZone
 hypervisor

On Fri, 2023-05-12 at 12:09 +0100, Conor Dooley wrote:
> On Fri, May 12, 2023 at 04:04:00PM +0800, 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
> > able to do virtual machine operations.
> 
> Propagated from v2:
> > > Why can't the driver just try and do virtual machine operations
> > > to
> > > see
> > > if the hypervisor is there? IOW, make your software interfaces
> > > discoverable. DT is for non-discoverable hardware.
> > 
> > Can do, our hypervisor is discoverable through invoking probing
> > hypercall, and we use the device tree to prevent unnecessary module
> > loading on all systems.
> 
> Rob is out of office at the moment, but that appears to be a request
> to
> drop the use of devicetree entirely. Mainly re-posting so that that
> conversation appears on the latest version of the patchset, given you
> only replied to Rob today.
> 
> Thanks,
> Conor.

We will remove our dt here and use the discoverable way to initialize
our devices. V4 patches which contain the changes mentioned would be
submitted soon in recent days.