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| author | Lu Baolu | 2018-12-10 02:58:59 +0100 |
|---|---|---|
| committer | Joerg Roedel | 2018-12-11 10:45:58 +0100 |
| commit | 3b33d4ab3217337f648f7ff3e57e755e6444c748 (patch) | |
| tree | d3d57942c0777b924091d9ef3884251d8a6dc861 /drivers/iommu/intel-iommu.c | |
| parent | iommu/vt-d: Add 256-bit invalidation descriptor support (diff) | |
| download | kernel-qcow2-linux-3b33d4ab3217337f648f7ff3e57e755e6444c748.tar.gz kernel-qcow2-linux-3b33d4ab3217337f648f7ff3e57e755e6444c748.tar.xz kernel-qcow2-linux-3b33d4ab3217337f648f7ff3e57e755e6444c748.zip | |
iommu/vt-d: Reserve a domain id for FL and PT modes
Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid
entry for first-level or pass-through translation should be
programmed with a domain id different from those used for
second-level or nested translation. It is recommended that
software could use a same domain id for all first-only and
pass-through translations.
This reserves a domain id for first-level and pass-through
translations.
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Liu Yi L <yi.l.liu@intel.com>
Cc: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel-iommu.c')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index d55254abd5ff..9818aaf2d0f7 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1621,6 +1621,16 @@ static int iommu_init_domains(struct intel_iommu *iommu) */ set_bit(0, iommu->domain_ids); + /* + * Vt-d spec rev3.0 (section 6.2.3.1) requires that each pasid + * 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. + */ + if (sm_supported(iommu)) + set_bit(FLPT_DEFAULT_DID, iommu->domain_ids); + return 0; } |