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When trying to passthru a DHRD-ignored PCI device, iommu_attach_device shall report success. Otherwise, the assign_vdev_pt_iommu_domain will result in HV panic. Same for iommu_detach_device case. Tracked-On: #5240 Signed-off-by: Stanley Chang <stanley.chang@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>