diff options
Diffstat (limited to 'results/classifier/gemma3:12b/device/1843711')
| -rw-r--r-- | results/classifier/gemma3:12b/device/1843711 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/results/classifier/gemma3:12b/device/1843711 b/results/classifier/gemma3:12b/device/1843711 new file mode 100644 index 000000000..e23e49a1a --- /dev/null +++ b/results/classifier/gemma3:12b/device/1843711 @@ -0,0 +1,12 @@ + +qemu-xhci device should detect if libusb host supports streams + +When using USBÂ passthrough with the qemu-xhci (and nec-usb-xhci), streams are enabled by default, but if the host xHCI controller doesn't support them, it will trigger hard-to-debug UAS guest errors. + +This should be possible to detect since the kernel returns ENOSYS (errno 38) when xhci host controller does not support streams: + libusb: error [do_streams_ioctl] streams-ioctl failed error -1 errno 38 + qemu: libusb_alloc_streams: -99 [OTHER] + +Maybe libusb should return a dedicated error instead of LIBUSB_ERROR_OTHER in this case, but qemu does not handle any other error code anyway. + +Just trying to enable streams before enabling them in qemu should do it. I don't know if it should be done in hcd-xhci.c, host-libusb.c or elsewhere, but this would be detectable at launch instead of a static option true/false, maybe a ternary with auto would be better. \ No newline at end of file |