This is a note to let you know that I've just added the patch titled
iommu/vt-d: Always reserve a domain ID for identity setup
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-vt-d-always-reserve-a-domain-id-for-identity-s.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5beeafaad8655610b97914834fc912c484861bbc
Author: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Mon Sep 2 10:27:13 2024 +0800
iommu/vt-d: Always reserve a domain ID for identity setup
[ 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@xxxxxxxxxxxxxxx>
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
Reviewed-by: Jerry Snitselaar <jsnitsel@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240809055431.36513-4-baolu.lu@xxxxxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 46b2751c3f003..acb870a877ec0 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -1846,10 +1846,10 @@ 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;
}
