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

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Message-ID: <46CCB8BA.6060007@superbug.demon.co.uk>
Date:	Wed, 22 Aug 2007 23:29:14 +0100
From:	James Courtier-Dutton <James@...erbug.demon.co.uk>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	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

Chris Wright wrote:
> * James Courtier-Dutton (James@...erbug.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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