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

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Message-ID: <46CCC361.6020600@goop.org>
Date:	Wed, 22 Aug 2007 16:14:41 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	James Courtier-Dutton <James@...erbug.demon.co.uk>
CC:	Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>,
	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Avi Kivity <avi@...ranet.com>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt

James Courtier-Dutton wrote:
> Ok, so I need to get a new CPU like the Intel Core Duo that has VT
> features? I have an old Pentium 4 at the moment, without any VT features.
>   

No, VT-d (as opposed to VT) is a chipset feature which allows the
hypervisor to control who's allowed to DMA where.  So you'd need a very
new machine with a VT-d capable chipset (which would also have VT, since
all new processors do).

    J
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