linux-kernel - Re: [PATCH] arm: document "mach-virt" platform.

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Date:	Thu, 30 Jan 2014 17:15:49 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Christopher Covington <cov@...eaurora.org>
CC:	<linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, Pawel Moll <pawel.moll@....com>,
	"Stefano Stabellini" <stefano.stabellini@...citrix.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Kumar Gala <galak@...eaurora.org>,
	Olof Johansson <olof@...om.net>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: document "mach-virt" platform.

On Thu, 2014-01-30 at 11:54 -0500, Christopher Covington wrote:
> > +++ b/Documentation/devicetree/bindings/arm/mach-virt.txt
> > @@ -0,0 +1,32 @@
> > +* Mach-virt "Dummy Virtual Machine" platform
> > +
> > +"mach-virt" is the smallest, dumbest platform possible, to be used as
> > +a guest for Xen, KVM and other hypervisors.
> 
> The platform is also useful to, and used by, simulators like QEMU in TCG mode.

I can mention this, although I don't think the list needs to be
exhaustive.
                                      It has no
> > +properties/functionality of its own and is driven entirely by device
> > +tree.
> 
> I find this wording confusing. I read it as saying the platform has no
> properties or functionality. Perhaps you could phrase it slightly differently,
> such as having no properties or functionality beyond what's described in the
> device tree.

Yes, this is what I was trying to say, I'll update with something along
those lines.

> > +The platform may also provide hypervisor specific functionality
> > +(e.g. PV I/O), if it does so then this functionality must be
> > +discoverable (directly or indirectly) via device tree.
> 
> I think it would be informative to provide pointers here to commonly used
> paravirtualized devices, especially VirtIO PCI/MMIO.

Under what criteria would something be eligible/appropriate to be
listed? I was trying to avoid "advocating" any particular type of PV
devices. We already have something of a problem with people incorrectly
assuming that mach-virt == virtio, which is not the case.

If we did want to include an explicit list here at a minimum I would
also want to include the Xen PV devices as well and surely there would
be others which ought to be included too.

Ian.

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