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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