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

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Message-ID: <1391426067.10515.54.camel@kazak.uk.xensource.com>
Date:	Mon, 3 Feb 2014 11:14:27 +0000
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Christoffer Dall <christoffer.dall@...aro.org>
CC:	Christopher Covington <cov@...eaurora.org>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, Arnd Bergmann <arnd@...db.de>,
	Pawel Moll <pawel.moll@....com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Will Deacon <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, "Rob Herring" <robh+dt@...nel.org>,
	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 Sun, 2014-02-02 at 20:56 -0800, Christoffer Dall wrote:
> On Thu, Jan 30, 2014 at 11:54:46AM -0500, Christopher Covington wrote:
> > Hi Ian,
> > 
> > On 01/30/2014 11:11 AM, Ian Campbell wrote:
> > > mach-virt has existed for a while but it is not written down what it actually
> > > consists of. Although it seems a bit unusual to document a binding for an
> > > entire platform since mach-virt is entirely virtual it is helpful to have
> > > something to refer to in the absence of a single concrete implementation.
> > > 
> > > I've done my best to capture the requirements based on the git log and my
> > > memory/understanding.
> > > 
> > > While here remove the xenvm dts example, the Xen tools will now build a
> > > suitable mach-virt compatible dts when launching the guest.
> > 
> 
> [...]
> 
> > > +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.
> > 
> 
> I disagree: that would only encourage limited testing or assumptions
> about these specific devices when really this platform is just a
> bare-bones platform driven by device tree which should make no
> preference, whatsoever, about which devices are used with the platform.

Thanks, I think this is exactly what I was failing to express coherently
last week ;-)

Ian.

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