aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/pci
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/intel-iommu.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index e3e84ca..4660795 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1530,12 +1530,15 @@ static int domain_context_mapping_one(struct dmar_domain *domain, int segment,
/* Skip top levels of page tables for
* iommu which has less agaw than default.
+ * Unnecessary for PT mode.
*/
- for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
- pgd = phys_to_virt(dma_pte_addr(pgd));
- if (!dma_pte_present(pgd)) {
- spin_unlock_irqrestore(&iommu->lock, flags);
- return -ENOMEM;
+ if (translation != CONTEXT_TT_PASS_THROUGH) {
+ for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
+ pgd = phys_to_virt(dma_pte_addr(pgd));
+ if (!dma_pte_present(pgd)) {
+ spin_unlock_irqrestore(&iommu->lock, flags);
+ return -ENOMEM;
+ }
}
}
}