> From: joro@xxxxxxxxxx <joro@xxxxxxxxxx> > Sent: Monday, October 18, 2021 7:38 PM > > On Thu, Oct 14, 2021 at 03:00:38AM +0000, Tian, Kevin wrote: > > I saw a concept of deferred attach in iommu core. See iommu_is_ > > attach_deferred(). Currently this is vendor specific and I haven't > > looked into the exact reason why some vendor sets it now. Just > > be curious whether the same reason might be applied to virtio-iommu. > > The reason for attach_deferred is kdump support, where the IOMMU driver > needs to keep the mappings from the old kernel until the device driver > of the new kernel takes over. > ok. Then there is no problem with the original statement: All endpoints managed by the IOMMU should be attached to a domain, so global bypass isn't in use after endpoints are probed. Thanks Kevin _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization