Re: [PATCH 13/15] PCI, device core: Add private memory access for DEVICE_TRUST_TCB

[Aneesh Kumar K.V <aneesh.kumar@kernel.org>]

"Dan Williams (nvidia)" <djbw@kernel.org> writes:

> Aneesh Kumar K.V wrote:
>> Dan Williams <djbw@kernel.org> writes:
>> 
>> > A device that wants to access private memory needs to have its trust
>> > elevated to DEVICE_TRUST_TCB. That trust is established either at compile
>> > time (unlikely), the bus knows the device is within the TCB to start (some
>> > paravisor setups), or the device is dynamically added to the TCB in
>> > coordination with a TSM driver (primary TDISP use case) and the trust is
>> > elevated by driver match.
>> >
>> 
>> 
>> Do we have the last case, where the device is dynamically added to the
>> TCB in coordination with a TSM, implemented in this series? Do we expect
>> the CCA driver to set that up?
>
> In this case "dynamically added" means pre-existing device converted
> from shared to private operation. I.e. the model the work-in-progress
> CCA patches already cover if that was your question?

So we accept the device and then load the driver with trust=tcb ?. If not,
where do we set the device->bus_trust = DEVICE_TRUST_TCB? 

-aneesh