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

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Message-ID: <20070822223424.GE3672@sequoia.sous-sol.org>
Date:	Wed, 22 Aug 2007 15:34:24 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	James Courtier-Dutton <James@...erbug.demon.co.uk>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	Jeremy Fitzhardinge <jeremy@...p.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 (James@...erbug.demon.co.uk) 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.

Depends on your goals.  You can certainly give a paravirt Xen guest[1]
physical hardware without any VT extentions.  But that guest will be
able to DMA anywhere in memory without VT-d, so if it's an untrusted
guest you'd be taking a huge risk.

thanks,
-chris

[1] Note: this is with the xenbits.xensource.com kernel, not with a
kernel you'll get from kernel.org ATM.
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