Message-ID: <46CCB8BA.6060007@superbug.demon.co.uk>
Date: Wed, 22 Aug 2007 23:29:14 +0100
From: James Courtier-Dutton <James@superbug.demon.co.uk>
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To: Chris Wright <chrisw@sous-sol.org>
CC: Jeremy Fitzhardinge <jeremy@goop.org>, Zachary Amsden <zach@vmware.com>,
       Andrew Morton <akpm@osdl.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Virtualization Mailing List <virtualization@lists.osdl.org>,
       Rusty Russell <rusty@rustcorp.com.au>, Avi Kivity <avi@qumranet.com>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt
References: <46CBC842.4070100@vmware.com> <46CCB088.8070606@goop.org> <46CCB56F.8090308@superbug.co.uk> <20070822222036.GD3672@sequoia.sous-sol.org>
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Chris Wright wrote:
> * James Courtier-Dutton (James@superbug.co.uk) wrote:
>> If one could directly expose a device to the guest, this feature could
>> be extremely useful for me.
>> Is it possible? How would it manage to handle the DMA bus mastering?
> 
> Yes it's possible (Xen supports pci pass through).  Without an IOMMU
> (like Intel VT-d or AMD IOMMU) it's not DMA safe.
> 
> thanks,
> -chris

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.

Kind Regards

James


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