Replies: 4 comments 9 replies
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Cloud Hypervisor doesn't support USB passthrough. |
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@sboeuf Got it. Is it (USB passthrough) on the road map? |
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No it's not. |
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Would USB support be interesting for the project at all? Especially in edge scenarios USB passthrough is very useful and we might have some time to work on this. |
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My preferred eventual solution here would be the standalone vhost-user devices idea that @stsquad suggested a while ago. It would allow, with very few modifications necessary, a VMM to query all the information it needs about the device from the backend, avoiding the need for the VMM to enumerate every type of vhost-user device it supports. (This is a lot nicer than a vfio-user device, because vhost-user devices are simpler to implement (just virtio, not full PCI), and because there are lots of vhost-user devices already out there that could be very easily made to support this.) |
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That's true and this proposal would simplify the vhost-user flow, but it's ultimately limited to virtio devices. That's ok for many usecases, but especially for Windows guests it's really convenient to be able to emulate standard devices that Windows already knows how to drive. So from my point, both the vhost-user standalone extensions and vfio-user are super useful! |
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We would be interested in supporting USB devices for SlicerVM.com users - mostly home users who have some kind of USB device like a TPU or radio for Flightaware. I hadn't thought of passing a whole USB controller through VFIO.. that's an interesting idea if supported well in a computer's IOMMU groups |
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You might also be interested in https://github.com/cyberus-technology/usbvfiod. |
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Thanks that does look worth a try |
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So I was trying to passthrough a host USB device to a cloud hypervisor VM, but when starting the VM, the API call failed with
start instance: request failed: 500 Internal Server Error: VmBoot(VmBoot(DeviceManager(VfioCreate(InvalidPath)))).Here's the device config I'm using:
{ ... "devices":[ { "path":"/dev/bus/usb/002/003", "iommu":false, "id":"usb", "pci_segment":0 } ] }I also tried to replace the path with
/sys/bus/usb/devices/2-2, got the same error too. Does cloud hypervisor (v21.0) support USB passthrough? If so, what path should I use here?Beta Was this translation helpful? Give feedback.
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