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KitsuneNoBaka · March 23, 2026, 10:45am

SR-IOV slice passthrough: libxenlight reports failed to create domain, device model not starting, error -9

opened 08:02PM - 20 Mar 25 UTC

closed 01:13AM - 17 Apr 25 UTC

C: Xen P: default hardware support diagnosed pr submitted affects-4.2 affects-4.3 r4.3-host-cur-test

### Qubes OS release Qubes OS 4.2 ### Brief summary Attempting to passthrough… a SR-IOV slice to a qube results in libxenlight failing to create the VM. /var/log/xen/console/guest-(vmname)-dm.log reports: ``` qemu: Failed to open: /sys/bus/pci/devices/0000:00:00.0/config: No such file or directory ``` /var/log/libvirt/libxl/libxl-driver.log reports: ``` 2025-03-20 19:48:44.596+0000: libxl: libxl_dm.c:2857:stubdom_xswait_cb: Domain 14:Stubdom 15 for 14 startup: startup timed out 2025-03-20 19:48:44.596+0000: libxl: libxl_create.c:1975:domcreate_devmodel_started: Domain 14:device model did not start: -9 2025-03-20 19:48:45.026+0000: libxl: libxl_device.c:1218:device_backend_callback: Domain 15:unable to remove device with path /local/domain/5/backend/vif/15/0 2025-03-20 19:48:45.113+0000: libxl: libxl_domain.c:1589:devices_destroy_cb: Domain 15:libxl__devices_destroy failed ``` dmesg reports device is successfully resetting: ``` [ 1029.489488] pciback 0000:00:02.4: resetting [ 1029.489652] i915 0000:00:02.0: VF4 FLR [ 1029.590708] pciback 0000:00:02.4: reset done [ 1029.607896] pciback 0000:00:02.4: xen_pciback: vpci: assign to virtual slot 0 [ 1029.608235] pciback 0000:00:02.4: registering for 17 [ 1029.889348] xen-blkback: backend/vbd/17/51712: using 1 queues, protocol 1 (x86_64-abi) persistent grants [ 1029.892732] xen-blkback: backend/vbd/17/51728: using 1 queues, protocol 1 (x86_64-abi) persistent grants [ 1029.898080] xen-blkback: backend/vbd/17/51744: using 1 queues, protocol 1 (x86_64-abi) persistent grants [ 1059.663980] pciback 0000:00:02.4: resetting [ 1059.664294] i915 0000:00:02.0: VF4 FLR [ 1059.766668] pciback 0000:00:02.4: reset done [ 1059.772566] i915 0000:00:02.0: VF4 FLR ``` (logs are obviously limited to relevant fields. Full files available if needed. ### Steps to reproduce 1.Install modified i915 module, complete with kernel option changes 2.create VFS slices 3.attach to VM 4.Start VM ### Expected behavior VM starts successfully, with or without acceleration (additional configuration is required for in-vm os ### Actual behavior vm fails out with libxenlight error, failed to create domain ### Additional information Using modified i915 driver from strongtz github. Confirmed passthrough works on alternate linux distros (tested archlinux, fedora 41), compatible with hardware EDIT (MANY): Cleaned up log quotes for readability