On Mon, 26 Feb 2018 02:12:39 -0500 "taii...@gmx.com" <taii...@gmx.com> wrote:
> How would I with libvirt/qemu and AMD-Vi v1.26 restrict device > communication inside a VM as it would be on the host? https://libvirt.org/formatdomain.html#elementsIommu (Yes, you can use Intel IOMMU emulation backed by an AMD IOMMU) The assigned devices cannot share an IOMMU group with any other assigned device as we cannot create separate address spaces for devices which are grouped together. This configuration will also impose performance overhead in the DMA mapping path. You'll need to determine for your use case if device assignment is sill a performance advantage vs other options. The typical use case for emulated IOMMU is isolated userspace drivers such as DPDK in the guest. Much like a VM use case, and unlike a kernel driver use case, these drivers generally use mostly static mappings for DMA. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
