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

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Date:	Thu, 20 Sep 2012 14:30:26 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Marc Zyngier <marc.zyngier@....com>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"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>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] arm: introduce a DTS for Xen unprivileged virtual
 machines

On Thu, 2012-09-20 at 13:28 +0100, Marc Zyngier wrote:
> I think the important thing here is that the memory map is RS1. As this
> is a (very limited) subset of a vexpress A15, it seems to make some sense.

Looking at arch/arm/boot/dts/vexpress-v2m-rs1.dtsi I don't think we
provide anything which is on rs1 though.

The Xen VM environment has only a gic (via a combination of the gic
virtualisation mode for CPU regs and emulation for the distributor), the
arch timers and xenbus (which is the s/w bus which Xen uses to discover
its paravirtualised peripherals).

Currently we provide a very simple output only emulation of UART0,
simply to get the debug output from the decompresser, but we want that
to go away not get baked in.

Ian.

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