linux-kernel - Re: [PATCH] Add I/O hypercalls for i386 paravirt

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Date:	Thu, 23 Aug 2007 04:34:04 +0200
From:	Andi Kleen <ak@...e.de>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andi Kleen <ak@...e.de>,
	James Courtier-Dutton <James@...erbug.demon.co.uk>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt

On Wed, Aug 22, 2007 at 05:38:31PM -0700, Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> > On Wed, Aug 22, 2007 at 04:14:41PM -0700, Jeremy Fitzhardinge wrote:
> >   
> >> (which would also have VT, since
> >> all new processors do).
> >>     
> >
> > Not true unfortunately. The Intel low end parts like Celerons (which 
> > are actually shipped in very large numbers) don't. Also Intel
> > is still shipping some CPUs that don't support it at all, like
> > the ULV Centrinos which are based on an older core.
> >   
> 
> Likely to be missing VT-d too, right?

VT-d is chipset functionality. So it depends on the chipset.

At least initially the non Intel chipsets and lowend chips are unlikely
to get IOMMUs I guess.

There might be some exceptions. e.g. the GPU vendors seem
to want to to their own IOMMUs, so perhaps graphic devices
might have them anyways.

-Andi
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