iommu/vt-d: Always reserve a domain ID for identity setup

[ Upstream commit 2c13012 ] We will use a global static identity domain. Reserve a static domain ID for it. Signed-off-by: Lu Baolu <[email protected]> Reviewed-by: Jason Gunthorpe <[email protected]> Reviewed-by: Kevin Tian <[email protected]> Reviewed-by: Jerry Snitselaar <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Joerg Roedel <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
pop-os · Oct 10, 2024 · d97b7dd · d97b7dd
1 parent e58cd57
commit d97b7dd
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
@@ -1447,10 +1447,10 @@ static int iommu_init_domains(struct intel_iommu *iommu)
 	 * 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.
+	 * this purpose. This domain id is also used for identity domain
+	 * in legacy mode.
 	 */
-	if (sm_supported(iommu))
-		set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
+	set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
 
 	return 0;
 }