Re: [PATCH v3 12/13] PCI/TSM: support TDI related operations for host TSM driver

[Alexey Kardashevskiy <aik@amd.com>]

On 4/6/25 08:47, Dan Williams wrote:
> Suzuki K Poulose wrote:
> [..]
>>> Ok, something like this? and iommufd will call tsm_bind()?
>>
>> Remember that there may be other devices, AMBA CHI based devices
>> being assigned. Not sure if they pretend to be PCI or not.
> 
> I have been thinking about this especially with the relative ease of
> creating samples/devsec/ given the existing Linux infrastructure
> emulating PCI host bridges.
> 
> Why not require PCI emulation for non-PCI devices? The tipping point is
> whether the relative maintenance burden of not needing to maintain
> multi-bus Device Security infrastructure outweighs the complexity of
> impedance matching those other buses to PCI.
> 
> Make "PCI" the lingua franca of Device Security.

This is how virtio started, and now it has to behave like a proper PCI device, i.e. use DMA API. Or ivshmem which maps memory as "PCI" (which it is not PCI but the guest does not know it) and is deprecated now. Not the best idea to enforce PCI from day1 imho.


-- 
Alexey