[coreboot] DMA protection? [AMD-Vi]

[ron minnich]

On Sun, Nov 20, 2016 at 3:49 PM Kyösti Mälkki <kyosti.malkki at gmail.com>
wrote:

> On Mon, Nov 21, 2016 at 1:36 AM, ron minnich <rminnich at gmail.com> wrote:
>
> The way coreboot has always enforced DMA protections is to not set bus
> master enabling on IO devices. I trust that particular setting a lot more
> than I trust trying to configure an IOMMU, given that such configuration
> seems to require trying to parse ACPI DMAR tables. If you will now tell me
> that some bad IO device might ignore BME, then I would want to know how to
> disable PCI bus mastering in the root complex, but certainly not via the
> IOMMU.
>
>
> And just grepping for PCI_COMMAND_MASTER would suggest such enforcing has
> completely been forgotten for some years. Like for the UART of
> intel/skylake in bootblock already.
>
> <https://www.coreboot.org/mailman/listinfo/coreboot>
>
>

That needs to be fixed it would seem :-)

ron
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