Hi Jason, On 4/16/21 4:34 PM, Jason Gunthorpe wrote: > On Fri, Apr 16, 2021 at 04:26:19PM +0200, Auger Eric wrote: > >> This was largely done during several confs including plumber, KVM forum, >> for several years. Also API docs were shared on the ML. I don't remember >> any voice was raised at those moments. > > I don't think anyone objects to the high level ideas, but > implementation does matter. I don't think anyone presented "hey we > will tunnel an uAPI through VFIO to the IOMMU subsystem" - did they? At minimum https://events19.linuxfoundation.cn/wp-content/uploads/2017/11/Shared-Virtual-Memory-in-KVM_Yi-Liu.pdf But most obviously everything is documented in Documentation/userspace-api/iommu.rst where the VFIO tunneling is clearly stated ;-) But well let's work together to design a better and more elegant solution then. Thanks Eric > > Look at the fairly simple IMS situation, for example. This was > presented at plumbers too, and the slides were great - but the > implementation was too hacky. It required a major rework of the x86 > interrupt handling before it was OK. > > Jason >
