linux-kernel - Re: [Xen-devel] [PATCH v6 1/4] arm: introduce psci_smp

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Message-ID: <1366388166.29403.2.camel@dagon.hellion.org.uk>
Date:	Fri, 19 Apr 2013 17:16:06 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"arnd@...db.de" <arnd@...db.de>,
	"marc.zyngier@....com" <marc.zyngier@....com>,
	"will.deacon@....com" <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v6 1/4] arm: introduce psci_smp_ops

On Fri, 2013-04-19 at 16:47 +0100, Nicolas Pitre wrote:
> No one should be probing registers without making sure it is safe to do 
> so.  Even on non virtualized hardware this can be a dangerous thing to 
> do.

Won't people writing per machine code consider, not unreasonably, that
having been called through a mdesc machine specific hook constitutes
enough "making sure" that they think it is safe to touch registers which
are specific to that machine?

Ian.

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