On Sun, Nov 20, 2016 at 3:49 PM Kyösti Mälkki <[email protected]> wrote:
> On Mon, Nov 21, 2016 at 1:36 AM, ron minnich <[email protected]> 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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