linux-kernel - Re: [PATCH] arm: introduce a DTS for Xen unprivileged virtual machines

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Date:	Thu, 20 Sep 2012 11:17:02 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Pawel Moll <pawel.moll@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm: introduce a DTS for Xen unprivileged virtual
 machines

On Wed, 2012-09-19 at 18:44 +0100, Stefano Stabellini wrote:
> +/include/ "skeleton.dtsi"
> +
> +/ {
> +	model = "XENVM-4.2";

Why the shouty caps?

Did you mean 4.3 here and throughout?

> +	compatible = "xen,xenvm-4.2", "arm,vexpress";

Is this second compatible thing actually true? We don't actually emulate
much (anything?) of what would be on a real vexpress motherboard.

"arm,vexpress" is used only in v2m.c and I don't think we want the
majority of that -- we don't provide any of the peripherals which it
registers.

I think the only things we might want out of that lot are the arch timer
and perhaps the uart0 (as a debug port).

I suspect we should have our own xen machine .c.

[...]
> +	gic: interrupt-controller@...01000 {
> +		compatible = "arm,cortex-a9-gic";

Don't we mean "arm,cortex-a15-gic" here? That's what we actually
provide. I'm not sure how the a9 and a15 differ.

> +		#interrupt-cells = <3>;
> +		#address-cells = <0>;
> +		interrupt-controller;
> +		reg = <0x2c001000 0x1000>,
> +		      <0x2c002000 0x100>;
> +	};
> +

Ian.

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