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    SubjectRe: [PATCH 0/1] uio_pci_generic: extensions to allow access for non-privileged processes
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    On Thursday 01 April 2010 05:52:18 am Joerg Roedel wrote:
    > On Wed, Mar 31, 2010 at 05:08:38PM -0700, Tom Lyon wrote:
    > > uio_pci_generic has previously been discussed on the KVM list, but this
    > > patch has nothing to do with KVM, so it is also going to LKML.
    >
    > But since you send it to the KVM list it should be suitable for KVM too,
    > no?
    I know not.

    >
    > > The point of this patch is to beef up the uio_pci_generic driver so that
    > > a non-privileged user process can run a user level driver for most PCIe
    > > devices. This can only be safe if there is an IOMMU in the system with
    > > per-device domains. Privileged users (CAP_SYS_RAWIO) are allowed if
    > > there is no IOMMU.
    >
    > If you rely on an IOMMU you can use the IOMMU-API instead of the DMA-API
    > for dma mappings. This change makes this driver suitable for KVM use
    > too. If the interface is designed clever enough we can even use it for
    > IOMMU emulation for pass-through devices.
    The use with privileged processes and no IOMMUs is still quite useful, so I'd
    rather stick with the DMA interface.



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