Hi Christian
As you pointed out this does appear to be an issue with the reduced
kernel kvm image. I ran the same setup using a standard image and the
interface showed up. However after running your suggested updates from
comment A on the kvm kernal image, the interface still did not show up.
If I bring up the guest using a generic image (not the kvm specific
kernal) the interface appears for SRIOV VF
Linux emsk8sm1 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
$ ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP
group default qlen 1000
link/ether 52:54:00:8a:9c:ea brd ff:ff:ff:ff:ff:ff
inet 192.168.50.243/22 brd 192.168.51.255 scope global ens3
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe8a:9cea/64 scope link
valid_lft forever preferred_lft forever
3: ens6: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group
default qlen 1000
link/ether e2:7e:67:02:77:11 brd ff:ff:ff:ff:ff:ff
inet 10.72.2.21/22 brd 10.72.3.255 scope global ens6
valid_lft forever preferred_lft forever
inet6 fe80::e07e:67ff:fe02:7711/64 scope link
valid_lft forever preferred_lft forever
This is the output from Linux 5.4.0-1020-kvm before any updates to linux-image
$ ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether 52:54:00:8a:9c:ea brd ff:ff:ff:ff:ff:ff
inet 192.168.50.243/22 brd 192.168.51.255 scope global ens3
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe8a:9cea/64 scope link
valid_lft forever preferred_lft forever
3: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN 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 group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
$ lsmod
Module Size Used by
loop 28672 6
nls_utf8 12288 0
nls_iso8859_1 12288 1
nls_cp437 16384 1
vfat 16384 1
fat 57344 1 vfat
dm_multipath 20480 0
dm_mod 86016 2 dm_multipath
kvm_intel 176128 0
pata_acpi 12288 0
ip_tables 20480 0
x_tables 24576 1 ip_tables
$ lspci -v
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: fast devsel
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: medium devsel
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
(prog-if 80 [ISA Compatibility mode-only controller, supports bus mastering])
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: bus master, medium devsel, latency 0
Memory at 000001f0 (32-bit, non-prefetchable) [virtual] [size=8]
Memory at 000003f0 (type 3, non-prefetchable) [virtual]
Memory at 00000170 (32-bit, non-prefetchable) [virtual] [size=8]
Memory at 00000370 (type 3, non-prefetchable) [virtual]
I/O ports at c0e0 [virtual] [size=16]
Kernel driver in use: ata_piix
Kernel modules: pata_acpi
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: medium devsel, IRQ 9
00:02.0 VGA compatible controller: Cirrus Logic GD 5446 (prog-if 00 [VGA
controller])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: fast devsel
Memory at fc000000 (32-bit, prefetchable) [size=32M]
Memory at feb90000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at 000c0000 [disabled] [size=128K]
00:03.0 Ethernet controller: Red Hat, Inc. Virtio network device
Subsystem: Red Hat, Inc. Virtio network device
Physical Slot: 3
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c040 [size=32]
Memory at feb91000 (32-bit, non-prefetchable) [size=4K]
Memory at fe010000 (64-bit, prefetchable) [size=16K]
Expansion ROM at feb00000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
00:04.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #1 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c060 [size=32]
00:04.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #2 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c080 [size=32]
00:04.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #3 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c0a0 [size=32]
00:04.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #1 (rev 03) (prog-if 20 [EHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at feb92000 (32-bit, non-prefetchable) [size=4K]
00:05.0 SCSI storage controller: Red Hat, Inc. Virtio block device
Subsystem: Red Hat, Inc. Virtio block device
Physical Slot: 5
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c000 [size=64]
Memory at feb93000 (32-bit, non-prefetchable) [size=4K]
Memory at fe014000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
00:06.0 Ethernet controller: Intel Corporation Ethernet Virtual Function 700
Series (rev 02)
Subsystem: Intel Corporation Ethernet Virtual Function 700 Series
Physical Slot: 6
Flags: fast devsel
Memory at fe000000 (64-bit, prefetchable) [size=64K]
Memory at fe018000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
00:07.0 Unclassified device [00ff]: Red Hat, Inc. Virtio memory balloon
Subsystem: Red Hat, Inc. Virtio memory balloon
Physical Slot: 7
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c0c0 [size=32]
Memory at fe01c000 (64-bit, prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: virtio-pci
After running the following commands
$ apt install linux-image-generic
$ apt remove linux-image-kvm
$ reboot
Note the interface does not show up after installing linux-image-generic
$ ip add
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group
default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP
group default qlen 1000
link/ether 52:54:00:8a:9c:ea brd ff:ff:ff:ff:ff:ff
inet 192.168.50.243/22 brd 192.168.51.255 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::5054:ff:fe8a:9cea/64 scope link
valid_lft forever preferred_lft forever
3: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN 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 group default qlen 1000
link/sit 0.0.0.0 brd 0.0.0.0
$ lsmod
Module Size Used by
nls_utf8 12288 0
nls_iso8859_1 12288 1
nls_cp437 16384 1
vfat 16384 1
loop 28672 6
fat 57344 1 vfat
dm_multipath 20480 0
dm_mod 86016 2 dm_multipath
kvm_intel 176128 0
pata_acpi 12288 0
ip_tables 20480 0
x_tables 24576 1 ip_tables
$ lspci -v
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: fast devsel
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: medium devsel
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
(prog-if 80 [ISA Compatibility mode-only controller
, supports bus mastering])
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: bus master, medium devsel, latency 0
Memory at 000001f0 (32-bit, non-prefetchable) [virtual] [size=8]
Memory at 000003f0 (type 3, non-prefetchable) [virtual]
Memory at 00000170 (32-bit, non-prefetchable) [virtual] [size=8]
Memory at 00000370 (type 3, non-prefetchable) [virtual]
I/O ports at c0e0 [virtual] [size=16]
Kernel driver in use: ata_piix
Kernel modules: pata_acpi
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
Subsystem: Red Hat, Inc. Qemu virtual machine
Flags: medium devsel, IRQ 9
00:02.0 VGA compatible controller: Cirrus Logic GD 5446 (prog-if 00 [VGA
controller])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: fast devsel
Memory at fc000000 (32-bit, prefetchable) [size=32M]
Memory at feb90000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at 000c0000 [disabled] [size=128K]
00:03.0 Ethernet controller: Red Hat, Inc. Virtio network device
Subsystem: Red Hat, Inc. Virtio network device
Physical Slot: 3
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c040 [size=32]
Memory at feb91000 (32-bit, non-prefetchable) [size=4K]
Memory at fe010000 (64-bit, prefetchable) [size=16K]
Expansion ROM at feb00000 [disabled] [size=512K]
Capabilities: [98] MSI-X: Enable- Count=3 Masked-
Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
Capabilities: [70] Vendor Specific Information: VirtIO: Notify
Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
Capabilities: [50] Vendor Specific Information: VirtIO: ISR
Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
Kernel driver in use: virtio-pci
00:04.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #1 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c060 [size=32]
00:04.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #2 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c080 [size=32]
00:04.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #3 (rev 03) (prog-if 00 [UHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c0a0 [size=32]
00:04.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #1 (rev 03) (prog-if 20 [EHCI])
Subsystem: Red Hat, Inc. QEMU Virtual Machine
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at feb92000 (32-bit, non-prefetchable) [size=4K]
00:05.0 SCSI storage controller: Red Hat, Inc. Virtio block device
Subsystem: Red Hat, Inc. Virtio block device
Physical Slot: 5
Flags: bus master, fast devsel, latency 0, IRQ 10
I/O ports at c000 [size=64]
Memory at feb93000 (32-bit, non-prefetchable) [size=4K]
Memory at fe014000 (64-bit, prefetchable) [size=16K]
Capabilities: [98] MSI-X: Enable- Count=2 Masked-
Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
Capabilities: [70] Vendor Specific Information: VirtIO: Notify
Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
Capabilities: [50] Vendor Specific Information: VirtIO: ISR
Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
Kernel driver in use: virtio-pci
00:06.0 Ethernet controller: Intel Corporation Ethernet Virtual Function 700
Series (rev 02)
Subsystem: Intel Corporation Ethernet Virtual Function 700 Series
Physical Slot: 6
Flags: fast devsel
Memory at fe000000 (64-bit, prefetchable) [size=64K]
Memory at fe018000 (64-bit, prefetchable) [size=16K]
Capabilities: [70] MSI-X: Enable- Count=5 Masked-
Capabilities: [a0] Express Endpoint, MSI 00
00:07.0 Unclassified device [00ff]: Red Hat, Inc. Virtio memory balloon
Subsystem: Red Hat, Inc. Virtio memory balloon
Physical Slot: 7
Flags: bus master, fast devsel, latency 0, IRQ 11
I/O ports at c0c0 [size=32]
Memory at fe01c000 (64-bit, prefetchable) [size=16K]
Capabilities: [84] Vendor Specific Information: VirtIO: <unknown>
Capabilities: [70] Vendor Specific Information: VirtIO: Notify
Capabilities: [60] Vendor Specific Information: VirtIO: DeviceCfg
Capabilities: [50] Vendor Specific Information: VirtIO: ISR
Capabilities: [40] Vendor Specific Information: VirtIO: CommonCfg
Kernel driver in use: virtio-pci
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: qemu (Ubuntu)
Status: Incomplete => Confirmed
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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
Status in linux package in Ubuntu:
Confirmed
Status in qemu package in Ubuntu:
Confirmed
Bug description:
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
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