Hi Jason, Shameer, On 9/8/25 3:40 PM, Jason Gunthorpe wrote: > On Mon, Sep 08, 2025 at 08:22:59AM +0000, Shameer Kolothum wrote: >>> nit: strictly speaking couldn't we have a stage2 being used at guest >>> level implemented by a stage1 at physical level? >>> but it is totally fair to restrict the support. >> Yeah it is possible I guess. But then we have to use the S2TTB to configure >> Host SMMUv3 S1 instead of S1ContextPtr which is used now. > S1 and S2 have different PTE formats, you cannot take a guest S2 table > with S2 PTEs and have the hypervisor program it to a S1. > > The guest must see a SMMU with no S2 support in the IDRs.
Yes you're right. As PTE are different we cannot do it. Sorry for the noise. Eric > > Jason >
