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Instead of misbehaving in case we would encounter such an IOMMU, refuse to use it. Signed-off-by: Jan Beulich --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -1267,8 +1267,11 @@ int __init iommu_alloc(struct acpi_drhd_ quirk_iommu_caps(iommu); + nr_dom = cap_ndoms(iommu->cap); + if ( cap_fault_reg_offset(iommu->cap) + cap_num_fault_regs(iommu->cap) * PRIMARY_FAULT_REG_LEN > PAGE_SIZE || + ((nr_dom - 1) >> 16) /* I.e. cap.nd > 6 */ || (has_register_based_invalidation(iommu) && ecap_iotlb_offset(iommu->ecap) >= PAGE_SIZE) ) { @@ -1294,8 +1297,6 @@ int __init iommu_alloc(struct acpi_drhd_ if ( !ecap_coherent(iommu->ecap) ) iommu_non_coherent = true; - nr_dom = cap_ndoms(iommu->cap); - if ( nr_dom <= DOMID_MASK * 2 + cap_caching_mode(iommu->cap) ) { /* Allocate domain id (bit) maps. */