On Thu, Oct 29, 2020 at 06:43:51PM +0100, Stefano Garzarella wrote: > This patch enables the IOTLB API support for vhost-vsock devices, > allowing the userspace to emulate an IOMMU for the guest. > > These changes were made following vhost-net, in details this patch: > - exposes VIRTIO_F_ACCESS_PLATFORM feature and inits the iotlb > device if the feature is acked > - implements VHOST_GET_BACKEND_FEATURES and > VHOST_SET_BACKEND_FEATURES ioctls > - calls vq_meta_prefetch() before vq processing to prefetch vq > metadata address in IOTLB > - provides .read_iter, .write_iter, and .poll callbacks for the > chardev; they are used by the userspace to exchange IOTLB messages > > This patch was tested with QEMU and a patch applied [1] to fix a > simple issue: > $ qemu -M q35,accel=kvm,kernel-irqchip=split \ > -drive file=fedora.qcow2,format=qcow2,if=virtio \ > -device intel-iommu,intremap=on \ > -device vhost-vsock-pci,guest-cid=3,iommu_platform=on > > [1] https://lists.gnu.org/archive/html/qemu-devel/2020-10/msg09077.html > > Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx> > --- > drivers/vhost/vsock.c | 68 +++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 65 insertions(+), 3 deletions(-) Reviewed-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
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