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

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Message-ID: <20100709061007.GD20370@verge.net.au>
Date:	Fri, 9 Jul 2010 15:10:07 +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, Jul 08, 2010 at 10:33:08PM -0700, Jeremy Fitzhardinge wrote:
> On 07/08/2010 09:24 PM, Simon Horman wrote:
> >> 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?
> >   
> 
> I wouldn't go that far; the PV vs HVM choice is pretty complex, and
> depends on what your workload is and what hardware you have available. 
> All I meant was what I said: that if you're running on a machine with a
> large amount of memory, then you should run your 32-bit domains as HVM
> rather than PV.  Though Xen could easily keep domains limited to memory
> that they can actually use (it already does this, in fact).

Hi Jeremy,

thanks for the clarification.
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