Package: linux-image-amd64
Version: 6.1.133-1
Description:
I noticed a regression with the most recent kernel 6.1.0-33 (6.1.133) of Debian
Bookworm:
libvirtd VMs don't start up anymore when they are being passed through a PCI device (in my case the
PCI device is a network card). The error message is:
"""
Apr 13 07:35:08 noc libvirtd\[4984\]: libvirt version: 9.0.0, package:
9.0.0-4+deb12u2 (Debian)
Apr 13 07:35:08 xyz libvirtd\[4984\]: hostname: xyz
Apr 13 07:35:08 xyz libvirtd\[4984\]: Unable to read from monitor: Connection
reset by peer
Apr 13 07:35:08 xyz libvirtd\[4984\]: internal error: qemu unexpectedly closed the monitor:
2025-04-13T05:35:08.436709Z qemu-system-x86_64: -device
{"driver":"vfio-pci","host":"0000:05:00.0","id":"hostdev0","bus":"
pci.8","addr":"0x0"}: VFIO_MAP_DMA failed: Cannot allocate memory
2025-04-13T05:35:08.447462Z qemu-system-x86_64: -device
{"driver":"vfio-pci","host":"0000:05:00.0","id":"hostdev0","bus":"pci.8","addr":"0x0"}: vfio
0000:05:00.0: failed to set
"""
The definition of the PCI device pass through looks like this:
"""
<hostdev mode="subsystem" type="pci" managed="yes">
<driver name="vfio"/>
<source>
<address domain="0x0000" bus="0x05" slot="0x00" function="0x0"/>
</source>
<alias name="hostdev0"/>
<address type="pci" domain="0x0000" bus="0x08" slot="0x00" function="0x0"/>
</hostdev>
"""
When reverting the kernel back to previous version 6.1.0-32 (6.1.129), the VM boots up OK, i.e. the
error is gone.
