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Add a helper to allocate an iommufd device's virtual device (in the user space) per a viommu instance. While at it, introduce a struct IOMMUFDVdev for later use by vendor IOMMU implementations. Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com> Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> Tested-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Shameer Kolothum <skolothumtho@nvidia.com> Reviewed-by: Yi Liu <yi.l.liu@intel.com> Message-id: 20260126104342.253965-3-skolothumtho@nvidia.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>