On 2016-06-08 17:17, Mark Rutland 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. I don't want to write yet another virtual driver but ideally reuse pci-host-generic. Possibly a dumb question, but bow can I make Linux instantiate a device node compatible with that driver and with the desired resources? That's what made me think of overlays. Thanks, Jan -- Siemens AG, Corporate Technology, CT RDA ITP SES-DE Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
