diff options
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 10 | ||||
| -rw-r--r-- | drivers/iommu/intel-pasid.h | 6 |
2 files changed, 16 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index d55254abd5ff..9818aaf2d0f7 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1621,6 +1621,16 @@ static int iommu_init_domains(struct intel_iommu *iommu) */ set_bit(0, iommu->domain_ids); + /* + * Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid + * entry for first-level or pass-through translation modes should + * be programmed with a domain id different from those used for + * second-level or nested translation. We reserve a domain id for + * this purpose. + */ + if (sm_supported(iommu)) + set_bit(FLPT_DEFAULT_DID, iommu->domain_ids); + return 0; } diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h index 12f480c2bb8b..03c1612d173c 100644 --- a/drivers/iommu/intel-pasid.h +++ b/drivers/iommu/intel-pasid.h @@ -17,6 +17,12 @@ #define PDE_PFN_MASK PAGE_MASK #define PASID_PDE_SHIFT 6 +/* + * Domain ID reserved for pasid entries programmed for first-level + * only and pass-through transfer modes. + */ +#define FLPT_DEFAULT_DID 1 + struct pasid_dir_entry { u64 val; }; |