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It does: Figure 9-8. Format for Second-Stage Paging Entries Bit 2 = X^1 1. X field is ignored by hardware if Execute Request Support (ERS) is reported as Clear in the Extended Capability Register or if SSEE=0 in the scalable-mode PASID-table entry referencing the second-stage paging entries. > > +static struct io_pgtable_ops * > > +vtdss_pt_iommu_alloc_io_pgtable(struct pt_iommu_vtdss_cfg *cfg, > > + struct device *iommu_dev, > > + struct io_pgtable_cfg **unused_pgtbl_cfg) { > > + struct io_pgtable_cfg pgtbl_cfg = {}; > > + > > + pgtbl_cfg.ias = 48; > > + pgtbl_cfg.oas = 52; > > Since the alloca_io_pgtable_ops() is used for PT allocation, the > pgtbl_cfg.ias and pgtbl_cfg.oas can be provided with the theoretical > max address sizes or simply leave them unassigned here. It doesn't work if they are unassigned. The map op returns EFAULT. Thanks, Jason