tags 645336 + moreinfo thanks On 14.10.2011 19:26, martin f krafft wrote: > Package: qemu-kvm > Version: 1:0.14.1+dfsg-4 > Severity: normal > > Instead of the classic command line switches like -serial and > -usbdevice, libvirt invokes kvm with the more generic syntax, e.g. > > -device serial,… > -device usb_host,…
Do you have a reference on this - I mean from libvirt side, not from qemu[-kvm] side? Libvirt usually does it the other way around: it adopts its code based on changes in qemu. So new devices/syntaxes appears in qemu first, and only after that they're being used in libvirt. In particular, -device serial does not exist and never did, but instead the right device is isa-serial, and that one existed for a very long time. For -device usb-host (correct spelling is usb-host not usb_host), this option exists and works. In order to use it, you have to declare usb bus first. I verfied it in 0.14 -- kvm -usb -device usb-host,vendorid=xx,productid=yy works just fine. > Unfortunately, kvm does not seem to support those, and the device is > not made available to the guest. If I manually influence the command > line and use the classic command line switches, then it works, > however. I'm not sure if I understand what you're saying here. > The reason why libvirt uses those generic -device lines is due to > hotplug support. Apparently -device … is hotpluggable, while > -usbdevice is not. Hot-UN-pluggable you mean? Because you can't hot-plug something which is already plugged. Anyway, all usb devices - regardless if you specified them as -device usb-foo or -usbfoo or used usb_add at runtime -- all of them are hot-unpluggable. Ditto for almost all pci devices. But devices like isa-serial (and anything on isa bus) is not hot-(un-)pluggable, by definition, because ISA bus does not support this feature and so there's no way for a guest to handle it even if it'll be supported by qemu itself. > It would be good if kvm would support those generic device > specifications, not only because it advertises them in its manpage, > but mostly because libvirt makes use of them already. It does already, it looks like. Can you provide some more background for all this? Thanks! /mjt -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
