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

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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>
This commit is contained in:
Lu Baolu 2024-09-02 10:27:13 +08:00 • committed by Joerg Roedel
parent 9e74e1b819
commit 2c13012e09
1 changed files with 3 additions and 3 deletions
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6
drivers/iommu/intel/iommu.c
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@ -1440,10 +1440,10 @@ 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;
}