> From: Liu, Yi L <yi.l.liu@xxxxxxxxx> > Sent: Wednesday, November 23, 2022 9:49 PM > > Jason's "Connect VFIO to IOMMUFD" introduces vfio iommufd compat mode. > Under > this mode, vfio_iommufd_bind() creates an access which has an unmap > callback, > which can be called immediately. This means mdev drivers may receive > unmap > requests before the mdev is opened. For now, most dma_unmap() callbacks > are > tolerant with such unmap requests, except for gvt-g and vfio-ap. This series > tries to enhance the two drivers. > there are only three drivers (gvt, vfio-ap and vfio-ccw) providing dma_unmap(). I'd not call the situation where only one driver is OK as "most dma_unmap() callbacks are tolerant".
