Bug 243640 - QEMU / KVM Q35 V4.X PCIe Virtual and Physical (Passthrough) Devices not detected
Summary: QEMU / KVM Q35 V4.X PCIe Virtual and Physical (Passthrough) Devices not detected
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 12.1-STABLE
Hardware: amd64 Any
: --- Affects Some People
Assignee: freebsd-bugs mailing list
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-01-27 01:43 UTC by John Hartley
Modified: 2020-02-12 20:26 UTC (History)
0 users

See Also:


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Description John Hartley 2020-01-27 01:43:16 UTC
Bug / Defect:

PCIe attached devices are not detected on when running FreeBSD 12.1 on QEMU Q35 V 4.x Virtual Machines.

This bug affects the following PCIe based devices:

VirtIO - All
em - When using e1000e QEMU emulator (PCIe attached Intel 1GbE NIC
ix - PCI Passthrough Intel X550 10GbE NIC

Likely all other PCIe devices whether via emulation or PCI Passthrough

Issues was discovered while testing:

Q35 with VirtIO:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236922

Q35 / OVMF with SCSI and Network Devices: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241774

Also appears to be root cause of defect raised with Q35 V4 and PCI Passthrough:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241581


Observed Behaviour:

Running QEMU/KVM VM - Q35 V4.x / OVMF / SATA / VirtIO / e1000e / e1000 / vmxnet3 / PCI Passthrough to Intel X550 10GbE / FreeBSD 12.1 with recompiled kernel to disable netmap ("dev netmap") sys/amd64/conf/GENERIC to address found bug with Q35 + netmap devices (see above reported and resolved bugs).

SATA - disk found
VirtIO - disk not found
e1000e - PCIe NIC not found
e1000 - Legacy PCI NIC found as em0
vmxnet3 - PCI connected NIC found as vmx0
X550 10GbE - not found.

Get the following:

dmesg errors

<<DMESG>>
...
pcib2: <PCI-PCI bridge> mem 0xc8b87000-0xc8b87fff irq 22 at device 2.1 on pci0
pcib2: Failed to allocate interrupt for PCI-e events
pcib3: <PCI-PCI bridge> mem 0xc8b86000-0xc8b86fff irq 22 at device 2.2 on pci0
pcib3: Failed to allocate interrupt for PCI-e events
pcib4: <PCI-PCI bridge> mem 0xc8b85000-0xc8b85fff irq 22 at device 2.3 on pci0
pcib4: Failed to allocate interrupt for PCI-e events
pcib5: <PCI-PCI bridge> mem 0xc8b84000-0xc8b84fff irq 22 at device 2.4 on pci0
pcib5: Failed to allocate interrupt for PCI-e events
...
<<END DMESG>>

ifconfig

<<IFCONFIG>>
# ifconfig -a
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
	options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
	inet6 ::1 prefixlen 128
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x1
	inet 127.0.0.1 netmask 0xff000000
	groups: lo
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
vmx0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=e403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
	ether 52:53:01:17:15:aa
	inet XX.XXX.XXX.53 netmask 0xffffff80 broadcast 203.XXX.XXX.127
	media: Ethernet autoselect
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
em0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=81209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER>
	ether 52:54:00:a4:13:df
	media: Ethernet autoselect (1000baseT <full-duplex>)
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
<<END IFCONFIG>>


Expected Behaviour:

Should get all NIC visible: 
m0 (e1000), em1 (e1000e), ix0 (X550 10GbE PCI Passthrough), vmx0 (vmxnet3)

Should get:
-- SATA - /dev/adaNpN storage devices
-- SCSI - /dev/daNpN VirtIO SCSI devices


I then retested with except with QEMU Q35 V3.1:

Storage"
SATA - OK
VirtIO SCSI - only ok when built with new VirtIO sub-system as per https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236922

Networking:
e1000 - ok comes up as em0
e1000e - ok comes up as em1
vmxnet3 - ok comes up as vmx0
X550 10GbE - ok comes up as ix0

ifconfig

<<IFCONFIG>>
# ifconfig -a
vmx0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=e403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
	ether 52:53:01:17:15:aa
	inet XXX.XXX.XXX.53 netmask 0xffffff80 broadcast XXX.XXX.XXX.127
	media: Ethernet autoselect
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
em0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=81209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,VLAN_HWFILTER>
	ether 52:54:00:a4:13:df
	media: Ethernet autoselect (1000baseT <full-duplex>)
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
ix0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=e53fbb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_UCAST,WOL_MCAST,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
	ether b4:96:91:21:4a:ce
	media: Ethernet autoselect
	status: no carrier
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
em1: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
	options=81249b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,LRO,WOL_MAGIC,VLAN_HWFILTER>
	ether 52:54:00:f8:3b:94
	media: Ethernet autoselect (1000baseT <full-duplex>)
	status: active
	nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
	options=680003<RXCSUM,TXCSUM,LINKSTATE,RXCSUM_IPV6,TXCSUM_IPV6>
	inet6 ::1 prefixlen 128
	inet6 fe80::1%lo0 prefixlen 64 scopeid 0x5
	inet 127.0.0.1 netmask 0xff000000
	groups: lo
	nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
<<END IFCONFIG>>

Here is QEMU Q35 V3.1 with PCI passthrough XML snippet:

<<LIBVIRT XML>>
virsh dumpxml test-freebsd-12.1 
<domain type='kvm' id='5'>
  <name>test-freebsd-12.1</name>
  <uuid>a50005d7-7425-435f-82e9-e76f18784693</uuid>
  <metadata>
    <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
      <libosinfo:os id="http://freebsd.org/freebsd/12.0"/>
    </libosinfo:libosinfo>
  </metadata>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64' machine='pc-q35-3.1'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/OVMF/OVMF_CODE.fd</loader>
    <nvram>/home/XXX/DIR/OVMF_VARS.fd</nvram>
  </os>
  <features>
    <acpi/>
    <apic/>
    <vmport state='off'/>
  </features>
  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>Broadwell-IBRS</model>
    <vendor>Intel</vendor>
    <feature policy='require' name='vme'/>
    <feature policy='require' name='ss'/>
    <feature policy='require' name='vmx'/>
    <feature policy='require' name='f16c'/>
    <feature policy='require' name='rdrand'/>
    <feature policy='require' name='hypervisor'/>
    <feature policy='require' name='arat'/>
    <feature policy='require' name='tsc_adjust'/>
    <feature policy='require' name='umip'/>
    <feature policy='require' name='md-clear'/>
    <feature policy='require' name='stibp'/>
    <feature policy='require' name='arch-capabilities'/>
    <feature policy='require' name='ssbd'/>
    <feature policy='require' name='xsaveopt'/>
    <feature policy='require' name='pdpe1gb'/>
    <feature policy='require' name='abm'/>
    <feature policy='disable' name='skip-l1dfl-vmentry'/>
  </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>destroy</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='/home/XXX/DIR/test-hd1-01.qcow2'/>
      <backingStore/>
      <target dev='sda' bus='sata'/>
      <boot order='1'/>
      <alias name='sata0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/home/XXX/DIR/FreeBSD-12.1-RELEASE-amd64-dvd1.iso'/>
      <backingStore/>
      <target dev='sdb' bus='sata'/>
      <readonly/>
      <boot order='2'/>
      <alias name='sata0-0-1'/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
...
...
    <controller type='sata' index='0'>
      <alias name='ide'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pcie-root'>
      <alias name='pcie.0'/>
    </controller>
    <controller type='pci' index='1' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='1' port='0x10'/>
      <alias name='pci.1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0' multifunction='on'/>
    </controller>
    <controller type='pci' index='2' model='pcie-to-pci-bridge'>
      <model name='pcie-pci-bridge'/>
      <alias name='pci.2'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' function='0x0'/>
    </controller>
    <controller type='pci' index='3' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='3' port='0x11'/>
      <alias name='pci.3'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x1'/>
    </controller>
    <controller type='pci' index='4' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='4' port='0x12'/>
      <alias name='pci.4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x2'/>
    </controller>
    <controller type='pci' index='5' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='5' port='0x13'/>
      <alias name='pci.5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x3'/>
    </controller>
    <controller type='pci' index='6' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='6' port='0x14'/>
      <alias name='pci.6'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x4'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <alias name='virtio-serial0'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:18:15:aa'/>
      <source bridge='br20'/>
      <target dev='vnet0'/>
      <model type='vmxnet3'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x01' function='0x0'/>
    </interface>
    <interface type='bridge'>
      <mac address='52:54:00:a4:13:df'/>
      <source bridge='br20'/>
      <target dev='vnet1'/>
      <model type='e1000'/>
      <alias name='net1'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x02' function='0x0'/>
    </interface>
    <interface type='bridge'>
      <mac address='52:54:00:f8:3b:94'/>
      <source bridge='br20'/>
      <target dev='vnet2'/>
      <model type='e1000e'/>
      <alias name='net2'/>
      <address type='pci' domain='0x0000' bus='0x06' slot='0x00' function='0x0'/>
    </interface>
...
...
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x06' slot='0x00' function='0x1'/>
      </source>
      <alias name='hostdev0'/>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
    </hostdev>
...
...

</domain>

<<END LIBVIRT XML>>

Diagnosis:

Considerable testing and diagnosis as been done as part of find and resolving VirtIO and netmap issues.

This has found how to replicate and work around the issues Q35 V4.X (Issue) and Q35 V31 (work around).

So problem appears to be within PCI device driver and relates to Q35 V4.x using PCIe GEN4 specification aligned emulation.

Tommy P has done considerable work to pin point likely source of issues: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241774#c74

I quote: "Starting with the Q35 QEMU 4.0 machine type, generic pcie-root-port will default to the maximum PCIe link speed (16GT/s) and width (x32) provided by the PCIe 4.0 specification."

This now needs to be confirmed by FreeBSD PCI core team for resolution.

Please advise if you need additional testing or diagnostic information.

Cheers,


John Hartley.