linux-kernel - Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

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Message-ID: <20100709042421.GB2951@verge.net.au>
Date:	Fri, 9 Jul 2010 13:24:21 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
	Matthew Wilcox <matthew@....cx>, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, macro@...ux-mips.org,
	kamezawa.hiroyu@...fujitsu.com, eike-kernel@...tec.de
Subject: Re: [PATCH 1/2] x86: ioremap: fix wrong physical address handling

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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