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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] Re: [PATCH 2 of 5] add can_dma/post_dma for direct IO
Date: Tue, 16 Dec 2008 16:29:58 +0000
References: <cc5d812eb9369a7ad2ef.1229105804@duo.random>
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To: qemu-devel@nongnu.org
Cc: Andrea Arcangeli <aarcange@redhat.com>, chrisw@redhat.com, kvm@vger.kernel.org, Blue Swirl <blauwirbel@gmail.com>, Gerd Hoffmann <kraxel@redhat.com>, Avi Kivity <avi@redhat.com>

> The generic resolving API should look something like
>
> int (*resolve)(target_phys_addr_t address_in, target_phys_addr_t
> length_in, target_phys_addr_t &address_out, target_phys_addr_t
> &length_out)

I don't think this is sufficient. A paged iommu may split a single range into 
multiple disjoint sections. i.e. we need SG lists.

Paul