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

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Message-ID: <20070822222036.GD3672@sequoia.sous-sol.org>
Date:	Wed, 22 Aug 2007 15:20:36 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	James Courtier-Dutton <James@...erbug.co.uk>
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>,
	Chris Wright <chrisw@...s-sol.org>,
	Avi Kivity <avi@...ranet.com>
Subject: Re: [PATCH] Add I/O hypercalls for i386 paravirt

* 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
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