Jamie Lokier wrote: > Anthony Liguori wrote: > >> Richard W.M. Jones wrote: >> Have you considered using a usb serial device? Something attractive >> about it is that a productid/vendorid can be specified which means that >> you can use that as a method of enumerating devices. >> >> Hot add/remove is supported automagically. >> > > The same applies to PCI: productid/vendorid (and subids); > PCI hotplug is possible though not as native as USB. >
What's nice about USB is that HID specifies quite a few functional generic devices that can be extended to increase functionality. This means you can implement a more sophisticated usb device that satisfies the serial interface, provide a special more featureful driver for Linux, and just use normal serial for Windows. The downside is that USB emulation stinks. > Here's another idea: Many devices these days have a serial number or > id string. E.g. USB storage, ATA drives, media cards, etc. Linux > these days creates alias device nodes which include the id string in > the device name. E.g. /dev/disks/by-id/ata-FUJITSU_MHV2100BH_NWAQT662615H > > So in addition to (or instead of) /dev/vmch0, /dev/vmch1 etc., > Linux guests could easily generate: > > /dev/vmchannel/by-role/clipboard-0 > /dev/vmchannel/by-role/gueststats-0 > /dev/vmchannel/by-role/vmmanager-0 > > It's not necessary to do this at the beginning. All that is needed is > to provide enough id information that will appear in /sys/..., so that > that a udev policy for naming devices can be created at some later date. > Well my thinking is that the "clipboard" device actually becomes a USB serial device. It's easy to enumerate and detect via the existing Linux infrastructure. Plus usb drivers can be implemented in userspace which is a nice plus (cross platform too via libusb). Regards, Anthony Liguori > -- Jamie > _______________________________________________ Virtualization mailing list [email protected] https://lists.linux-foundation.org/mailman/listinfo/virtualization
