From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: Re: RFC: vfio / iommu driver for hardware with no iommu Date: Wed, 24 Apr 2013 12:57:18 +0200 Message-ID: <20130424105718.GJ17148@8bytes.org> References: <9F6FE96B71CF29479FF1CDC8046E15035BE0A3@039-SN1MPN1-002.039d.mgd.msft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <9F6FE96B71CF29479FF1CDC8046E15035BE0A3-TcFNo7jSaXPiTqIcKZ1S2K4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Yoder Stuart-B08248 Cc: "iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org" List-Id: iommu@lists.linux-foundation.org On Tue, Apr 23, 2013 at 04:13:00PM +0000, Yoder Stuart-B08248 wrote: > We're aware of the obvious limitations-- no protection, > DMA'able memory must be physically contiguous and will > have no iova->phy translation. But there are use cases > where all OSes involved are trusted and customers can > live with those limitations. Virtualization is used > here not to sandbox untrusted code, but to consolidate > multiple OSes. One of the major points of VFIO is to provide a userspace interface for hardware IOMMUs. So if you have a platform without an IOMMU why do you care about VFIO at all? Joerg