diff options
| author | Lu Baolu <baolu.lu@linux.intel.com> | 2023-03-29 21:47:20 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-03-31 10:06:15 +0200 |
| commit | bfd3c6b9fa4a1dc78139dd1621d5bea321ffa69d (patch) | |
| tree | 9a159f9aa827ab992bbcf856405831f5bd02c6df | |
| parent | c7d624520c1bd4e42d8ceb8283d6505fc90acccb (diff) | |
iommu/vt-d: Allow zero SAGAW if second-stage not supported
The VT-d spec states (in section 11.4.2) that hardware implementations
reporting second-stage translation support (SSTS) field as Clear also
report the SAGAW field as 0. Fix an inappropriate check in alloc_iommu().
Fixes: 792fb43ce2c9 ("iommu/vt-d: Enable Intel IOMMU scalable mode by default")
Suggested-by: Raghunathan Srinivasan <raghunathan.srinivasan@intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20230318024824.124542-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20230329134721.469447-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/intel/dmar.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index 6acfe879589c..23828d189c2a 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -1071,7 +1071,8 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd) } err = -EINVAL; - if (cap_sagaw(iommu->cap) == 0) { + if (!cap_sagaw(iommu->cap) && + (!ecap_smts(iommu->ecap) || ecap_slts(iommu->ecap))) { pr_info("%s: No supported address widths. Not attempting DMA translation.\n", iommu->name); drhd->ignored = 1; |