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    SubjectRe: [PATCH 03/11] PCI: pci_stub: Suppress kernel DMA ownership auto-claiming
    On Mon, Nov 15, 2021 at 10:05:44AM +0800, Lu Baolu wrote:
    > pci_stub allows the admin to block driver binding on a device and make
    > it permanently shared with userspace. Since pci_stub does not do DMA,
    > it is safe.

    If an IOMMU is setup and dma-iommu or friends are not used nothing is
    unsafe anyway, it just is that IOMMU won't work..

    > However the admin must understand that using pci_stub allows
    > userspace to attack whatever device it was bound to.

    I don't understand this sentence at all.

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