>+int intel_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
>+{
>+ return !dma_addr;
>+}
The implementation of inte_dma_mapping_error is incomplete.
Dma_addr is valid only when it belongs to hwdev's domain. This is all about VT-d isolation fundamental.
+int intel_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr)
+{
+ struct pci_dev *pdev = to_pci_dev(hwdev);
+ struct dmar_domain *domain;
+ struct iova *iova;
+
+ domain = find_domain(pdev);
+
+ iova = find_iova(&domain->iovad, IOVA_PFN(dma_addr));
+ if (!iova)
+ return -EINVAL;
+ return 0;
+}
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