Date: Fri, 9 Jul 2010 13:24:21 +0900
From: Simon Horman <horms@verge.net.au>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
       Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>,
       Matthew Wilcox <matthew@wil.cx>, tglx@linutronix.de, mingo@redhat.com,
       linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
       macro@linux-mips.org, kamezawa.hiroyu@jp.fujitsu.com,
       eike-kernel@sf-tec.de
Subject: Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling
Message-ID: <20100709042421.GB2951@verge.net.au>
References: <4C197A49.6020400@jp.fujitsu.com>
 <4C197A9E.5040509@jp.fujitsu.com>
 <20100617025052.GH9298@parisc-linux.org>
 <4C19A2EE.2010203@zytor.com>
 <4C19AABA.8000706@jp.fujitsu.com>
 <4C19BA9A.4010300@zytor.com>
 <4C19EC57.3000409@goop.org>
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On Thu, Jun 17, 2010 at 10:35:19AM +0100, Jeremy Fitzhardinge wrote:
> On 06/17/2010 07:03 AM, H. Peter Anvin wrote:
> > On 06/16/2010 09:55 PM, Kenji Kaneshige wrote:

[snip]

> >> greater value when 44-bits physical address limit is eliminated. And
> >> maybe we need to change phys_addr_valid() returns error if physical
> >> address is above (1 << __PHYSICAL_MASK_SHIFT)?
> >>     
> > The real question is how much we can fix without an unreasonable cost.
> >   
> 
> I think it would be a pretty large change.  From the Xen's perspective,
> any machine even approximately approaching the 2^44 limit will be
> capable of running Xen guests in hvm mode, so PV isn't really a concern.

Hi Jeremy,

Is the implication of that statement that HVM is preferred where
supported by HW?
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