linux-kernel - Re: [PATCH v2 0/6] Device tree support for Hyper-V VMBus driver

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Message-ID: <20230201020449.GC20379@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
Date:   Tue, 31 Jan 2023 18:04:49 -0800
From:   Saurabh Singh Sengar <ssengar@...ux.microsoft.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     krzysztof.kozlowski+dt@...aro.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, wei.liu@...nel.org, decui@...rosoft.com,
        daniel.lezcano@...aro.org, tglx@...utronix.de,
        virtualization@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hyperv@...r.kernel.org, mikelley@...rosoft.com,
        ssengar@...rosoft.com
Subject: Re: [PATCH v2 0/6] Device tree support for Hyper-V VMBus driver

On Tue, Jan 31, 2023 at 02:27:51PM -0600, Rob Herring wrote:
> On Tue, Jan 31, 2023 at 12:10 PM Saurabh Sengar
> <ssengar@...ux.microsoft.com> wrote:
> >
> > This set of patches expands the VMBus driver to include device tree
> > support.
> >
> > The first two patches enable compilation of Hyper-V APIs in a non-ACPI
> > build.
> >
> > The third patch converts the VMBus driver from acpi to more generic
> > platform driver.
> >
> > Further to add device tree documentation for VMBus, it needs to club with
> > other virtualization driver's documentation. For this rename the virtio
> > folder to more generic hypervisor, so that all the hypervisor based
> > devices can co-exist in a single place in device tree documentation. The
> > fourth patch does this renaming.
> >
> > The fifth patch introduces the device tree documentation for VMBus.
> >
> > The sixth patch adds device tree support to the VMBus driver. Currently
> > this is tested only for x86 and it may not work for other archs.
> 
> I can read all the patches and see *what* they do. You don't really
> need to list that here. I'm still wondering *why*. That is what the
> cover letter and commit messages should answer. Why do you need DT
> support? How does this even work on x86? FDT is only enabled for
> CE4100 platform.

HI Rob,

Thanks for your comments.
We are working on a solution where kernel is booted without ACPI tables to keep
the overall system's memory footprints slim and possibly faster boot time.
We have tested this by enabling CONFIG_OF for x86.

I can add this info in cover letter in next version.

Regards,
Saurabh

> 
> Rob