PCIe passthrough broken in 3.7
I’ve just upgraded my router that was on 3.6 to 3.7.
Now passthrough for my mini PCIe Wi-Fi card doesn’t work:
localhost:~# virsh start LEDE
error: Failed to start domain LEDE
error: internal error: process exited while connecting to monitor: Assertion failed: local_err (/home/buildozer/aports/main/qemu/src/qemu-2.10.1/hw/i386/kvm/pci-assign.c: assigned_realize: 1813)
The reason is qemu 2.10.1, since I’ve downgraded qemu-system-x86_64 to version from 3.6 repository (qemu 2.8.1) and it works again with the rest of 3.7 system.
Here is a complete machine config:
<domain type='kvm'>
<name>LEDE</name>
<uuid>fe0dc1e1-0091-4199-a37c-14954732e6c2</uuid>
<memory unit='KiB'>131072</memory>
<currentMemory unit='KiB'>131072</currentMemory>
<vcpu placement='static'>2</vcpu>
<os>
<type arch='x86_64' machine='pc-q35-2.8'>hvm</type>
<bootmenu enable='no'/>
</os>
<features>
<acpi/>
<apic/>
</features>
<cpu mode='host-model' check='partial'>
<model fallback='allow'/>
<topology sockets='1' cores='2' threads='1'/>
</cpu>
<clock offset='utc'>
<timer name='rtc' tickpolicy='catchup'/>
<timer name='pit' tickpolicy='delay'/>
<timer name='hpet' present='no'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<pm>
<suspend-to-mem enabled='no'/>
<suspend-to-disk enabled='no'/>
</pm>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/var/lib/libvirt/images/LEDE.qcow2'/>
<target dev='vda' bus='virtio'/>
<boot order='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<controller type='pci' index='0' model='pcie-root'/>
<controller type='pci' index='1' model='pcie-root-port'>
<model name='ioh3420'/>
<target chassis='1' port='0x8'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0' multifunction='on'/>
</controller>
<controller type='pci' index='2' model='pcie-root-port'>
<model name='ioh3420'/>
<target chassis='2' port='0x9'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
</controller>
<controller type='sata' index='0'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
</controller>
<controller type='usb' index='0' model='ich9-ehci1'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x7'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci1'>
<master startport='0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x0' multifunction='on'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci2'>
<master startport='2'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x1'/>
</controller>
<controller type='usb' index='0' model='ich9-uhci3'>
<master startport='4'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x1d' function='0x2'/>
</controller>
<interface type='bridge'>
<mac address='52:54:00:01:21:55'/>
<source bridge='lan'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
</interface>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='spice' autoport='yes'>
<listen type='address'/>
</graphics>
<video>
<model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1' primary='yes'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</video>
<hostdev mode='subsystem' type='pci' managed='yes'>
<source>
<address domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
</source>
<rom bar='off'/>
<address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
</hostdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</memballoon>
</devices>
</domain>
(from redmine: issue id 8217, created on 2017-12-01)