On 2020/8/23 下午2:40, Eli Cohen wrote:
+static void vhost_vdpa_set_iova_range(struct vhost_vdpa *v) +{ + struct vdpa_iova_range *range = &v->range; + struct iommu_domain_geometry geo; + struct vdpa_device *vdpa = v->vdpa; + const struct vdpa_config_ops *ops = vdpa->config; + + if (ops->get_iova_range) { + *range = ops->get_iova_range(vdpa); + } else if (v->domain && + !iommu_domain_get_attr(v->domain, + DOMAIN_ATTR_GEOMETRY, &geo) && + geo.force_aperture) { + range->first = geo.aperture_start; + range->last = geo.aperture_end; + } else { + range->first = 0; + range->last = ULLONG_MAX; + }Shouldn't we require drivers that publish VIRTIO_F_ACCESS_PLATFORM to implement get_iova_range?
Probably not, since ACCESS_PLATFORM does not exclude the device that depends on the chipset IOMMU to work. So in that case, we should query IOMMU driver instead of vDPA device driver.
Thanks
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