Bumping this, running virsh nodedev-detach pci_0000_xx_yy_z' (with proper numbers) and/or having managed=yes in the xml file changes nothing (actually i had this already), ovmf still hangs waiting for i have no idea what. Cannot run by unbinding the device through script either, seems that i was lucky, or maybe i did something that i forgot. Tried to add nodedev-detach to modprobe but it seems that i did not do it in the proper way so it wasn't working
2016-01-16 11:30 GMT+01:00 thibaut noah <[email protected]>: > Didn't know libvirt was capable of unbinding devices on its own, good to > know, i'm gonna try this and if i manage to make it work i don't have any > reason to bother myself more with this. (note that i don't use virt-manager > since you advise me to use libvirt directly) > Though the usb card will only be use by the vm, i have more than enough > usb ports on my backpanel. > > Tried the gpu method by adding the id of the device in modprobe.d after > gpu's ids but it didn't work. > > I paid it 50euros :( > Thanks for the explanations alex > > > 2016-01-15 18:59 GMT+01:00 Alex Williamson <[email protected]>: > >> A couple comments, first, boot time pre-binding to vfio-pci is really >> only necessary for devices where the native host drivers behave poorly >> if you take the device away from them later. This is why we do it for >> GPUs and their companion sound device, host GPU drivers don't like to >> give up the device, it plays poorly with any sort of graphics on the >> host, and sequestering the audio device prevents host tools from >> getting confused (and there are some bugs in the audio driver limiting >> number of attach/detach cycles iirc). >> >> For anything else, you can dynamically unbind the device from the host >> driver, bind it to vfio while the VM is running, and give it back to >> the host on shutdown. libvirt will do this automatically for you if >> your XML sets managed='yes' for the <hostdev> device. This is the >> default, so if you use virt-manager to add the device, just select Add >> Hardware -> PCI Host Device -> select device -> Finish. Done. If for some >> reason you don't want the device flopping back and forth between host and >> guest, just run 'virsh nodedev-detach pci_0000_xx_yy_z' at bootup where >> xx_yy_z is the PCI bus (xx), device (yy), and function (z) numbers, the >> same as in lspci. You can adopt some of the GPU methods for doing this if >> you want it to happen earlier as well, there are lots of ways to do this >> with modprobe.d (install options, softdep, etc..) >> >> Finally, yes I've seen OVMF hang with some crappy USB controllers. I'm >> not sure if it's dependent on the devices attached or the controller >> itself, but cheaper isn't always better when it comes to selecting >> devices to use with device assignment. Thanks, >> >> Alex >> > >
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