Re: [PATCH] PCI: ACPI: Allow internal devices to be marked as untrusted

[Mika Westerberg]

On Mon, Jan 24, 2022 at 08:27:17AM +0200, Mika Westerberg wrote:
> > > This patch introduces a new "UntrustedDevice" property that can be used
> > > by the firmware to mark any device as untrusted.
> 
> I think this new property should be documented somewhere too (also
> explain when to use it instead of ExternalFacingPort). If not in the
> next ACPI spec or some supplemental doc then perhaps in the DT bindings
> under Documentation/devicetree/bindings.

Actually Microsoft has similar already:

https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports#identifying-internal-pcie-ports-accessible-to-users-and-requiring-dma-protection

I think we should use that too here.