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

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Date:   Fri, 12 May 2023 12:09:27 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Yi-De Wu <yi-de.wu@...iatek.com>
CC:     Yingshiuan Pan <yingshiuan.pan@...iatek.com>,
        Ze-Yu Wang <ze-yu.wang@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arch@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        David Bradil <dbrazdil@...gle.com>,
        Jade Shih <jades.shih@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Ivan Tseng <ivan.tseng@...iatek.com>,
        My Chuang <my.chuang@...iatek.com>,
        Shawn Hsiao <shawn.hsiao@...iatek.com>,
        PeiLun Suei <peilun.suei@...iatek.com>,
        Liju Chen <liju-clr.chen@...iatek.com>
Subject: Re: [PATCH v3 2/7] dt-bindings: hypervisor: Add MediaTek GenieZone
 hypervisor

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.

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