Hi, In order to simulate some devices and write tests completely independent of real PCI devices, we continued the development of time-travel and related bits, and are adding PCI support here now.
The way it works is that it communicates with the outside (of UML) with virtio, which we previously added using vhost-user, and then offers a PCI bus to the inside system, where normal PCI probing etc. happens, but all config space & IO accesses are forwarded over virtio. To enable that, add lib/logic_iomem, similar to logic_pio but for iomem regions, this way, ioread/iowrite can be redirected over the virtio device. Since currently no official virtio device ID is assigned yet a Kconfig option for that is required to be set to the value you want to use locally for experimentation. Once we have an official value we can change the default (currently -1 which makes it non-functional) or remove the option entirely. johannes
