So I've bought this rather expensive USB 3.0 controller, making sure it
was compatible to everything on this planet and having a native pcie v2
interface and now I am having the problem, as soon as it gets passed
through, qemu cannot find it's boot disk any more.
"Boot failed. Could not read the boot disk". The boot menu only shows
legacy option rom or pxe.
I have no remote idea, where the relation between those two could be. It
is not, that the start up of the VM itself is failing, because of a
misconfiguration, it's just, that after powering on of the guest, it
cannot find any harddrives any more and tries to pxe boot instead.
As soon as I remove:
-device vfio-pci,host=0a:00.0,x-vga=off
from the configuration, the guest starts just normal - with another card
still passed through. So it is not a general passthrough problem. And
I've had passed through two cards before.
Needless to say, the guest image lives on a regular sata harddrive and
is not attached to that card in any way.
In addition, it is the only device in its vfio group, making it an even
more simple config:
# journalctl -k | grep -i iommu | grep 25
Dez 22 11:50:17 kernel: pci 0000:0a:00.0: Adding to iommu group 25
# lspci -s "0a:00.0" -n -v
0a:00.0 0c03: 1106:3483 (rev 01) (prog-if 30 [XHCI])
Subsystem: 1106:3483
Flags: fast devsel, IRQ 16, NUMA node 0
Memory at bf700000 (64-bit, non-prefetchable) [size=4K]
Capabilities: [80] Power Management version 3
Capabilities: [90] MSI: Enable- Count=1/4 Maskable- 64bit+
Capabilities: [c4] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Kernel driver in use: vfio-pci
Kernel modules: xhci_pci
How is it possible that this card affects the boot drive of qemu? Where
is the connection between "-drive file=/home/VM/guest.img" and "-device
vfio-pci"? And how to eventually debug this?
Since this behaviour is related to vfio-pci, I am hoping, this is still
the correct list, even though this seems to affect qemu as whole. In a
quite obscure, magical way, one might add.
Thanks very much for any help
Ede
P.S.: Preparation, even though the config should not be the issue:
# The Delock 5x USB Card (VIA)
ExecStart=-/usr/bin/sh -c 'echo "0000:0a:00.0" >
/sys/bus/pci/devices/0000:0a:00.0/driver/unbind'
ExecStart=/usr/bin/sh -c 'echo 1106 3483 >
/sys/bus/pci/drivers/vfio-pci/new_id'
ExecStart=/usr/bin/sh -c 'chgrp kvm /dev/vfio/25'
ExecStart=/usr/bin/sh -c 'chmod 0660 /dev/vfio/25'
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