On Wed, Sep 27, 2023 at 08:20:05PM -0300, Jason Gunthorpe wrote: > On Wed, Sep 27, 2023 at 05:38:55PM -0400, Michael S. Tsirkin wrote: > > On Tue, Sep 26, 2023 at 10:50:57AM -0300, Jason Gunthorpe wrote: > > > On Tue, Sep 26, 2023 at 01:42:52AM -0400, Michael S. Tsirkin wrote: > > > > On Mon, Sep 25, 2023 at 09:40:59PM -0300, Jason Gunthorpe wrote: > > > > > On Mon, Sep 25, 2023 at 03:44:11PM -0400, Michael S. Tsirkin wrote: > > > > > > > VDPA is very different from this. You might call them both mediation, > > > > > > > sure, but then you need another word to describe the additional > > > > > > > changes VPDA is doing. > > > > > > > > > > > > Sorry about hijacking the thread a little bit, but could you > > > > > > call out some of the changes that are the most problematic > > > > > > for you? > > > > > > > > > > I don't really know these details. > > > > > > > > Maybe, you then should desist from saying things like "It entirely fails > > > > to achieve the most important thing it needs to do!" You are not making > > > > any new friends with saying this about a piece of software without > > > > knowing the details. > > > > > > I can't tell you what cloud operators are doing, but I can say with > > > confidence that it is not the same as VDPA. As I said, if you want to > > > know more details you need to ask a cloud operator. > > > > So it's not the changes that are problematic, it's that you have > > customers who are not using vdpa. The "most important thing" that vdpa > > fails at is simply converting your customers from vfio to vdpa. > > I said the most important thing was that VFIO presents exactly the > same virtio device to the VM as the baremetal. Do you dispute that, > technically, VDPA does not actually achieve that? I dispute that it is the most important. The important thing is to have guests work. > Then why is it so surprising that people don't want a solution that > changes the vPCI ABI they worked hard to create in the first place? > > I'm still baffled why you think everyone should use vdpa.. > > Jason They shouldn't. If you want proprietary extensions then vfio is the way to go, I don't think vdpa will support that. -- MST
