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    SubjectRe: [PATCH 1/4] PCI / ACPI: Identify external PCI devices
    On Thu, Nov 15, 2018 at 08:27:41PM +0100, Lukas Wunner wrote:
    > On Thu, Nov 15, 2018 at 09:10:26PM +0200, Mika Westerberg wrote:
    > > I was thinking we could cover all these with is_external filling them
    > > based on the _DSD or some other means in the kernel.
    > >
    > > We would then deal all such devices as "untrusted" by default.
    >
    > Tinfoil hat on, even internal devices could be malicious.
    > What's the downside of enabling the feature for everything?

    Mostly performance, I think. That's the main reason we put all non
    external devices to passthrough IOMMU mode.

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