Re: [libvirt] [Qemu-devel] [PATCH for-4.0 v4 0/2] virtio: Provide version-specific variants of virtio PCI devices

Sorry to resurrect such an old thread, but I have been wondering... On Wed, 2018-12-05 at 17:57 -0200, Eduardo Habkost wrote: [...] ... if doing this was a good idea after all? While I understand that something like virtio-gpu, which supports the 1.0 specification exclusively, only really needs to have a single device associated with it from the functionality point of view, looking at it from a user's perspective it seems to me like providing an explicit non-transitional variant would be appropriate for consistency reasons, so that your guest could look like -device virtio-blk-pci-non-transitional \ -device virtio-net-pci-non-transitional \ -device virtio-gpu-pci-non-transitional \ and you wouldn't have to question why you can use the non-transitional variant for pretty much everything, except for the few cases where you can't - for no apparent reason... It would also signal quite clearly which devices support both transitional and non-transitional variants and which ones don't, without having to infer that the complete lack of (non-)transitional variants means that only the non-transitional variant is available - except you have to use the suffix-less device name to use it. tl;dr providing the non-transitional variant for virtio 1.0-only devices would make using this much more user-friendly. -- Andrea Bolognani / Red Hat / Virtualization