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iommu/vt-d: Enhance capability check for nested parent domain allocation

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This adds the scalable mode check before allocating the nested parent domain
as checking nested capability is not enough. User may turn off scalable mode
which also means no nested support even if the hardware supports it.

Fixes: c97d1b20d3 ("iommu/vt-d: Add domain_alloc_user op")
Link: https://lore.kernel.org/r/20231024150011.44642-1-yi.l.liu@intel.com
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu 2023-10-24 08:00:11 -07:00 committed by Jason Gunthorpe
parent 55a01657cb
commit a2cdecdf9d
2 changed files with 3 additions and 1 deletions
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2
drivers/iommu/intel/iommu.c
View File

@ -4095,7 +4095,7 @@ intel_iommu_domain_alloc_user(struct device *dev, u32 flags,
if (!iommu)
return ERR_PTR(-ENODEV);
if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ecap_nest(iommu->ecap))
if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !nested_supported(iommu))
return ERR_PTR(-EOPNOTSUPP);
dirty_tracking = (flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING);

2
drivers/iommu/intel/iommu.h
View File

@ -544,6 +544,8 @@ enum {
ecap_pasid((iommu)->ecap))
#define ssads_supported(iommu) (sm_supported(iommu) && \
ecap_slads((iommu)->ecap))
#define nested_supported(iommu) (sm_supported(iommu) && \
ecap_nest((iommu)->ecap))
struct pasid_entry;
struct pasid_state_entry;