diff options
| author | Lu Baolu <baolu.lu@linux.intel.com> | 2024-09-02 10:27:11 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2024-09-02 18:14:54 +0200 |
| commit | 184bee388d4661c3fea633f135a5c45ff03c7ec6 (patch) | |
| tree | c4966ec785c51be8830e3b78213cdebece4f7812 /drivers/iommu/intel | |
| parent | 7c626ce4bae1ac14f60076d00eafe71af30450ba (diff) | |
iommu/vt-d: Require DMA domain if hardware not support passthrough
The iommu core defines the def_domain_type callback to query the iommu
driver about hardware capability and quirks. The iommu driver should
declare IOMMU_DOMAIN_DMA requirement for hardware lacking pass-through
capability.
Earlier VT-d hardware implementations did not support pass-through
translation mode. The iommu driver relied on a paging domain with all
physical system memory addresses identically mapped to the same IOVA
to simulate pass-through translation before the def_domain_type was
introduced and it has been kept until now. It's time to adjust it now
to make the Intel iommu driver follow the def_domain_type semantics.
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Link: https://lore.kernel.org/r/20240809055431.36513-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 9ff8b83c19a3..90ad794a1be7 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2149,6 +2149,16 @@ static bool device_rmrr_is_relaxable(struct device *dev) static int device_def_domain_type(struct device *dev) { + struct device_domain_info *info = dev_iommu_priv_get(dev); + struct intel_iommu *iommu = info->iommu; + + /* + * Hardware does not support the passthrough translation mode. + * Always use a dynamaic mapping domain. + */ + if (!ecap_pass_through(iommu->ecap)) + return IOMMU_DOMAIN_DMA; + if (dev_is_pci(dev)) { struct pci_dev *pdev = to_pci_dev(dev); |