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    SubjectRe: [PATCH 3/9] add frontend implementation for the IOMMU API
    On Tue, Dec 02, 2008 at 12:58:29AM +0900, FUJITA Tomonori wrote:
    > On Mon, 01 Dec 2008 16:33:11 +0200
    > Avi Kivity <avi@redhat.com> wrote:
    >
    > > Joerg Roedel wrote:
    > > > Hmm, is there any hardware IOMMU with which we can't emulate domains by
    > > > partitioning the IO address space? This concept works for GART and
    > > > Calgary.
    > > >
    > > >
    > >
    > > Is partitioning secure? Domain X's user could program its hardware to
    > > dma to domain Y's addresses, zapping away Domain Y's user's memory.
    >
    > It can't be secure. So what's the point to emulate the domain
    > partitioning in many traditional hardware IOMMUs that doesn't support
    > it.

    Its a generic way to make non-contiguous host memory io-contiguous. I
    already pointed out some potential users for this.

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