[PATCH AUTOSEL 6.11 124/244] iommu/vt-d: Always reserve a domain ID for identity setup

[Sasha Levin <sashal@kernel.org>]

From: Lu Baolu <baolu.lu@linux.intel.com>

[ Upstream commit 2c13012e09190174614fd6901857a1b8c199e17d ]

We will use a global static identity domain. Reserve a static domain ID
for it.

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/20240809055431.36513-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/intel/iommu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 4aa070cf56e70..e3e513cabc86a 100644
--- 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;
 }
-- 
2.43.0