Hi Mark, > On Jun 8, 2016, at 18:17 , Mark Rutland <[email protected]> wrote: > > On Wed, Jun 08, 2016 at 04:16:32PM +0200, Jan Kiszka wrote: >> Hi all, >> >> already started the discussion off-list with Pantelis, but it's better >> done in public: >> >> I'm currently exploring ways to make Linux recognize dynamically added >> virtual hardware when running under the Jailhouse hypervisor [1]. We >> need to load drivers for inter-partition communication devices that only >> appear after Jailhouse started (which is done from within Linux, i.e. >> long after boot) or when a partition was added later on. Probably, we >> will simply add a virtual PCI host bridge on systems without physical >> PCI and let the IPC device be explored that way (already works on x86). >> Still, that leaves us with hotplug and unplug on hypervisor activation >> and deactivation. > > If I've understood correctly you want to use overlays to inject the > virtual PCI host bridge? > > Given that you know precisely what you want to inject, I'm not sure I > see the value of using an overlay. > > Is there some reason you can't just create a device without having to go > via an intermediate step? As I understand it, Xen does that for (some) > virtual devices provided to Dom0 and DomU. >
As far as I understand it PCI is just one of the cases. You could conceivably inject any kind of virtio device like serial/storage networking etc. The question is since overlays exist and do work, why should he do anything else besides using them? I doubt he’s interested in writing yet another driver for something that already exists and works. > Thanks, > Mark. Regards — Pantelis
