diff options
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index c5d78c87248a..49a669b1ce11 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -440,7 +440,14 @@ static int iommu_init_device(struct device *dev) dev_data->alias = get_alias(dev); - if (dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) { + /* + * By default we use passthrough mode for IOMMUv2 capable device. + * But if amd_iommu=force_isolation is set (e.g. to debug DMA to + * invalid address), we ignore the capability for the device so + * it'll be forced to go into translation mode. + */ + if ((iommu_pass_through || !amd_iommu_force_isolation) && + dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) { struct amd_iommu *iommu; iommu = amd_iommu_rlookup_table[dev_data->devid]; |