-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On Sat, Nov 09, 2019 at 07:18:40PM -0500, Demi M. Obenour wrote: > I was trying to use adb with QubesOS’s USB passthrough, and I was > not able to get it to work.
- From what I remember from my experiments with adb and qvm-usb, USBIP don't pass through device reset requests. And even when device is reset externally, qvm-usb won't assign it back automatically. The later thing may be actually a good thing, to prevent device suddenly changing its identification - like you think you attach some harmless device, but it switches to some exotic device with a known bug in its driver. But it breaks this use case. > According to a post on LKML, the USBIP driver (used by QubesOS > USB passthrough) and libusb are not meant to work together. > One alternative would be to use qemu in the stubdomain to present an > emulated PCI USB device, instead of requiring USBIP support in the > guest kernel. This would also allow USB passthrough to work to VMs > that do not support USBIP, or indeed even qrexec. This is interesting idea and indeed something we consider for non-Linux VMs. It won't help you for PVH domains though, as there is no qemu involved. Anyway, we'd be very welcome in a contributed patches in this area. > Right now, I plan on using adb in sys-usb itself, after blacklisting > drivers for USB devices not in use. There ought to be a better way. > IMO, sys-usb should *only* support USBIP, with the real protocol > handling done in other domains, and the resulting devices (be they > block devices or others) attached to yet other domains. Given performance and complexity of USB vs block protocols, IMO handling mass-storage directly in sys-usb and connecting it further as block device is a better idea. But otherwise I agree. Also, disposable sys-usb is a good idea when you use more complex devices directly in sys-usb: https://www.qubes-os.org/doc/disposablevm-customization/#using-static-disposablevms-for-sys- Using intermediate DisposableVM for "unpacking" USB protocol to something simpler would work in a principle, but has two major usability issues: - DisposableVM (or more specifically: Linux VM) takes some precious memory - USBIP is slow - -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhrpukzGPukRmQqkK24/THMrX1ywFAl3HXZQACgkQ24/THMrX 1ywBvQgAleE2CF2y/kBtt604DTGxhHAhJ6UMJLaB4G7g7YaFsk/0fBTXlVY05M5t 5hw/Re3WUxyWq0BVZ6Vio4Yw6AiSiULDDjsB2dU++eitom7XfIVaUagI1STzzPR+ mzASfdzfyBwO7k7TwcAYhFI1/E/n9BxDyVRjcPAhAbQtQSvYimmrhiW0OdpkNn7+ L3tvWlLWhQzYAjCsobERm4OelT6u0xhXPzaV7R/kGN1DG5ABmnkLfWZaicvFVw5T tmfE9FM8ry7zOTIN7WX+R9n0cny0UqYBVY68Bj1kY+eXEl8/cqpDSUnrN0CGOb7Y u2Dre8SjnwknZolJ9qJWbI2LTr39nw== =EbQp -----END PGP SIGNATURE----- -- You received this message because you are subscribed to the Google Groups "qubes-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-devel/20191110004508.GF5763%40mail-itl.
