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    SubjectRe: [PATCH] Xen-SWIOTBL v0.8.3 used for Xen PCI pass through for PV guests.
    On Tue, 2010-06-22 at 15:42 -0400, Konrad Rzeszutek Wilk wrote:
    > These nineteen patches lay the groundwork for Xen Paravirtualized (PV)
    > domains to access PCI pass-through devices. These patches utilize the
    > SWIOTLB library modifications (
    > The end user of this is the Xen PCI frontend and Xen PCI [1] which
    > require a DMA API "backend" that understands Xen's MMU. This allows the
    > PV domains to use PCI devices.

    Hi Konrad,

    Sorry if I missed it, but I didn't see any mention or apparent
    requirement of a hardware iommu in xen for this code. Is that true? If
    so, is there anything to stop a PV guest with ownership of a DMA capable
    PCI device from reading all sorts of memory that the domain wouldn't
    otherwise have access to? I was under the impression that the old PCI
    front/back for PV guests was mainly an interesting hack with limited
    applications due to security. Thanks,


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