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iommu/vt-d: Add domain_alloc_user op

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Add the domain_alloc_user() op implementation. It supports allocating
domains to be used as parent under nested translation.

Unlike other drivers VT-D uses only a single page table format so it only
needs to check if the HW can support nesting.

Link: https://lore.kernel.org/r/20230928071528.26258-7-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 2023-09-28 00:15:28 -07:00 committed by Jason Gunthorpe
parent 408663619f
commit c97d1b20d3
1 changed files with 28 additions and 0 deletions
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28
drivers/iommu/intel/iommu.c
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@ -4074,6 +4074,33 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type)
return NULL;
}
static struct iommu_domain *
intel_iommu_domain_alloc_user(struct device *dev, u32 flags)
{
struct iommu_domain *domain;
struct intel_iommu *iommu;
if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT))
return ERR_PTR(-EOPNOTSUPP);
iommu = device_to_iommu(dev, NULL, NULL);
if (!iommu)
return ERR_PTR(-ENODEV);
if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ecap_nest(iommu->ecap))
return ERR_PTR(-EOPNOTSUPP);
/*
* domain_alloc_user op needs to fully initialize a domain
* before return, so uses iommu_domain_alloc() here for
* simple.
*/
domain = iommu_domain_alloc(dev->bus);
if (!domain)
domain = ERR_PTR(-ENOMEM);
return domain;
}
static void intel_iommu_domain_free(struct iommu_domain *domain)
{
if (domain != &si_domain->domain && domain != &blocking_domain)
@ -4807,6 +4834,7 @@ const struct iommu_ops intel_iommu_ops = {
.capable = intel_iommu_capable,
.hw_info = intel_iommu_hw_info,
.domain_alloc = intel_iommu_domain_alloc,
.domain_alloc_user = intel_iommu_domain_alloc_user,
.probe_device = intel_iommu_probe_device,
.probe_finalize = intel_iommu_probe_finalize,
.release_device = intel_iommu_release_device,