On Thu, Sep 06, 2018 at 07:09:09PM -0500, Jiandi An wrote: > For virtio device we have to pass in iommu_platform=true flag for > this to set the VIRTIO_F_IOMMU_PLATFORM flag. But for example > QEMU has the use of iommu_platform attribute disabled for virtio-gpu > device. So would also like to move towards not having to specify > the VIRTIO_F_IOMMU_PLATFORM flag. Specifying VIRTIO_F_IOMMU_PLATFORM is the right thing for your platform given that you can't directly use physical addresses. Please fix qemu so that virtio-gpu works with VIRTIO_F_IOMMU_PLATFORM. Also just as I said for the power folks: you should really work with the qemu folks that VIRTIO_F_IOMMU_PLATFORM (or whatever we call the properly documented flag) can be set by default, and no pointless performance overhead is implied by having a sane and simple implementation. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
