On 11/5/25 9:34 AM, Mukesh Ojha wrote: > On Wed, Nov 05, 2025 at 08:17:14AM +0100, Krzysztof Kozlowski wrote: >> On 04/11/2025 08:35, Mukesh Ojha wrote: >>> Most Qualcomm platforms feature Gunyah hypervisor which handles IOMMU >> >> I don't think that's true. Washn't Gunyah something new? Like since >> SM8550? Look how many Qualcomm platforms we have in the arm/qcom.yaml >> bindings - for sure most of them are not post SM8550. > > > I should have rephrased it, thanks > > "Qualcomm platform which feature QHEE based hypervisor or a module in Gunyah > ... " > >> >>> configuration for remote processor and when it is not present, the >>> operating system must perform these configurations instead and for that >>> firmware stream should be presented to the operating system. Hence, add >>> iommus property as optional property for PAS supported devices. >> >> So which platforms actually need to do this? > > As I said above, almost every platform which features QHEE or Gunyah > hypervisor that support PAS based remoteproc subsystem should have this.
For added context, QHEE (pre-Gunyah hyp) has been with us almost forever Konrad
