On 9/19/2023 5:25 PM, Yi Liu wrote:
This adds the domain_alloc_user op implementation. It supports allocating domains to be used as parent under nested translation.Signed-off-by: Yi Liu <yi.l....@intel.com> --- drivers/iommu/intel/iommu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 5db283c17e0d..491bcde1ff96 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4074,6 +4074,25 @@ 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; + + 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);
The outer caller has checked (flags & IOMMU_HWPT_ALLOC_NEST_PARENT) before it comes here. If this callback is dedicated for nested domain allocation, then you may omit the condition here.
