Public bug reported:
After setting up pci pass through for a virtual function it did not show up as
an interface in Ubuntu 20.04, it did however show up as a PCI device.
After reverting back to 18.04 with exactly the same configuration the interface
showed up as expected.
Bellow is the configuration and output for both 18.04 and 20.04.
virt-install
--import
--connect qemu:///system --name emsk8sm1 --ram 8192
--disk pool/emsk8sm1/emsk8sm1.img,format=img,bus=virtio
--disk cidata.img,device=cdrom,format=img
--vcpus 4 --cpu host --os-type linux --os-variant ubuntu18.04
--network
bridge=br0,model=virtio,virtualport_type=openvswitch,mac=52:54:00:8a:9c:ea
--hostdev 3b:02.5
--console pty,target_type=serial
--graphics type=vnc,listen=0.0.0.0
--noautoconsole
--autostart -v
Configuration of 18.04 where the passthrough works
Version
Linux emsk8sm1 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:41:39 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
virsh dumpxml emsk8sm1
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x3b' slot='0x02' function='0x5'/>
</source>
<alias name='hostdev0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</hostdev>
lspci | grep Ethernet
00:03.0 Ethernet controller: Red Hat, Inc. Virtio network device
00:06.0 Ethernet controller: Intel Corporation Ethernet Virtual Function 700
Series (rev 02) <--- Pass through interface
ip link show [interface shows inside of vm ens6]
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
mode DEFAULT group default qlen 1000
link/ether 52:54:00:8a:9c:ea brd ff:ff:ff:ff:ff:ff
3: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode
DEFAULT group default qlen 1000
link/ether ea:99:ea:36:3e:63 brd ff:ff:ff:ff:ff:ff
Configuration of 20.04 where the VF shows as a PCI device but does not show as
an interface
Version
Linux emsk8sm1 5.4.0-1020-kvm #20-Ubuntu SMP Fri Jul 10 05:03:04 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
virsh dumpxml emsk8sm1
<hostdev mode='subsystem' type='pci' managed='yes'>
<driver name='vfio'/>
<source>
<address domain='0x0000' bus='0x3b' slot='0x02' function='0x5'/>
</source>
<alias name='hostdev0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
</hostdev>
lspci | grep Ethernet
00:03.0 Ethernet controller: Red Hat, Inc. Virtio network device
00:06.0 Ethernet controller: Intel Corporation Ethernet Virtual Function 700
Series (rev 02) <--- Pass through interface
ip link show [ens 6 does not show as an interface}
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode
DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
mode DEFAULT group default qlen 1000
link/ether 52:54:00:8a:9c:ea brd ff:ff:ff:ff:ff:ff
3: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group
default qlen 1000
link/ipip 0.0.0.0 brd 0.0.0.0
4: sit0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default
qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1892422
Title:
Pci passthrough interface not showing up in Ubuntu 20.04 but does show
in 18.04
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