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Re: [Qemu-devel] virtio-net-pci possible limitation on AArch64


From: Alexandru Avadanii
Subject: Re: [Qemu-devel] virtio-net-pci possible limitation on AArch64
Date: Tue, 25 Jul 2017 00:38:52 +0000

Hi, Andrew,
I tried rebuilding virtinst (1.3.2), but that made no difference.

However, changing "model=virtio-net-pci" to simply "model=virtio"  (and letting 
the default kick in via libvirt)
made a whole lot of difference (see domain xml at the end).

The interfaces are now on separate buses, all 4 work as expected, and the 
virtio legacy disable is no longer needed.

I am a bit curious what goes wrong with the original XML, but not that much to 
investigate it further.

Thank you,
Alex

New domain XML
---
<domain type='kvm' id='38'>
  <name>cfg01</name>
  <uuid>e4489f63-34a3-47f7-88c6-f6fb60a2aac0</uuid>
  <memory unit='KiB'>4194304</memory>
  <currentMemory unit='KiB'>4194304</currentMemory>
  <vcpu placement='static'>6</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='aarch64' machine='virt-2.9'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/AAVMF/AAVMF_CODE.fd</loader>
    <nvram>/var/lib/libvirt/qemu/nvram/cfg01_VARS.fd</nvram>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <gic version='3'/>
  </features>
  <cpu mode='host-passthrough' check='none'/>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/bin/kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2' cache='none' io='native'/>
      <source 
file='/home/jenkins/alav/armband/upstream/fuel/mcp/scripts/images/mcp_cfg01.qcow2'/>
      <backingStore/>
      <target dev='vda' bus='virtio'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x06' slot='0x00' 
function='0x0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source 
file='/home/jenkins/alav/armband/upstream/fuel/mcp/scripts/images/mcp_cfg01.iso'/>
      <backingStore/>
      <target dev='sda' bus='scsi'/>
      <readonly/>
      <alias name='scsi0-0-0-0'/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <controller type='scsi' index='0' model='virtio-scsi'>
      <alias name='scsi0'/>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' 
function='0x0'/>
    </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='0x8'/>
      <alias name='pci.1'/>
      <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='pcie-root-port'/>
      <target chassis='2' port='0x9'/>
      <alias name='pci.2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x1'/>
    </controller>
    <controller type='pci' index='3' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='3' port='0xa'/>
      <alias name='pci.3'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x2'/>
    </controller>
    <controller type='pci' index='4' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='4' port='0xb'/>
      <alias name='pci.4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x3'/>
    </controller>
    <controller type='pci' index='5' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='5' port='0xc'/>
      <alias name='pci.5'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x4'/>
    </controller>
    <controller type='pci' index='6' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='6' port='0xd'/>
      <alias name='pci.6'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x5'/>
    </controller>
    <controller type='pci' index='7' model='dmi-to-pci-bridge'>
      <model name='i82801b11-bridge'/>
      <alias name='pci.7'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' 
function='0x0'/>
    </controller>
    <controller type='pci' index='8' model='pci-bridge'>
      <model name='pci-bridge'/>
      <target chassisNr='8'/>
      <alias name='pci.8'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' 
function='0x0'/>
    </controller>
    <controller type='pci' index='9' model='pcie-root-port'>
      <model name='pcie-root-port'/>
      <target chassis='9' port='0xe'/>
      <alias name='pci.9'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' 
function='0x6'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:2f:9e:f0'/>
      <source network='pxe' bridge='pxe'/>
      <target dev='vnet0'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' 
function='0x0'/>
    </interface>
    <interface type='network'>
      <mac address='52:54:00:87:d5:81'/>
      <source network='mgmt' bridge='mgmt'/>
      <target dev='vnet1'/>
      <model type='virtio'/>
      <alias name='net1'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' 
function='0x0'/>
    </interface>
    <interface type='network'>
      <mac address='52:54:00:2f:9a:e5'/>
      <source network='internal' bridge='internal'/>
      <target dev='vnet2'/>
      <model type='virtio'/>
      <alias name='net2'/>
      <address type='pci' domain='0x0000' bus='0x03' slot='0x00' 
function='0x0'/>
    </interface>
    <interface type='network'>
      <mac address='52:54:00:64:41:45'/>
      <source network='public' bridge='public'/>
      <target dev='vnet3'/>
      <model type='virtio'/>
      <alias name='net3'/>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' 
function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/0'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1'>
      <listen type='address' address='127.0.0.1'/>
    </graphics>
    <video>
      <model type='vga' vram='16384' heads='1' primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x08' slot='0x01' 
function='0x0'/>
    </video>
  </devices>
  <seclabel type='dynamic' model='apparmor' relabel='yes'>
    <label>libvirt-e4489f63-34a3-47f7-88c6-f6fb60a2aac0</label>
    <imagelabel>libvirt-e4489f63-34a3-47f7-88c6-f6fb60a2aac0</imagelabel>
  </seclabel>
  <seclabel type='dynamic' model='dac' relabel='yes'>
    <label>+113:+115</label>
    <imagelabel>+113:+115</imagelabel>
  </seclabel>
</domain>

> -----Original Message-----
> From: Alexandru Avadanii
> Sent: Monday, July 24, 2017 6:53 PM
> To: 'Andrew Jones'
> Cc: address@hidden; svc-armband
> Subject: RE: [Qemu-devel] virtio-net-pci possible limitation on AArch64
> 
> Hi, Andrew,
> Thank you for looking at this.
> Comments inline.
> 
> > -----Original Message-----
> > From: Andrew Jones [mailto:address@hidden
> > Sent: Monday, July 24, 2017 6:02 PM
> > To: Alexandru Avadanii
> > Cc: address@hidden; svc-armband
> > Subject: Re: [Qemu-devel] virtio-net-pci possible limitation on
> > AArch64
> >
> > On Fri, Jul 21, 2017 at 06:37:26PM +0000, Alexandru Avadanii wrote:
> > > Hi,
> > > I ran into an interesting limitation (or possibly bug) while trying
> > > to attach
> > more than 3 (three) virtio-net-pci NICs to an AArch64 guest.
> > > I created 4 network with virsh (see below for xml defitions) -
> > > nothing fancy,
> > only 2 of them use NAT.
> > >
> > > Attaching a virtio-net-pci NIC for each network works well, VMs can
> > > be
> > spawned, all devices are properly detected by the guest OS.
> > > The first 3 guest interfaces work perfectly, however I can't get any
> > > traffic
> > on the 4th one (in my case the public one).
> > >
> > > QEMU version: 2.9.0
> > > Libvirt: tested with both 1.3.4 and 3.5.0, although I don't think
> > > libvirt is to blame here
> >
> > 1.3.4 is way too old for AArch64 guests - 3.0.0 was the first release
> > that contained basic support. The XML below doesn't show what I'd
> > expect for the PCIe topology either (see [*]), and that's likely the
> > problem. I suggest you try a fresh VM creation using latest libvirt and virt
> tools.
> > If it still doesn't work, then confirm it's not a bridging issue by
> > checking that it's always the forth network by changing their order.
> 
> I also tried libvirt 3.5.0, but maybe I missed something, like newer 
> virt-tools. I
> will redo the test.
> In my previous tests, I tried changing the order, and it was always the fourth
> interface having issues.
> 
> >
> > [*] QEMU doc: docs/config/mach-virt-graphical.cfg
> >
> > > Host OS: Ubuntu Xenial 16.04.2 LTS
> > > Guest OS: Ubuntu Xenial Cloud Image (latest available)
> > > Reproducibility
> > > rate: 100% with below config
> > >
> > > VM is created with (also domain XML attached at the end of this mail):
> > > $ virt-install --name cfg01 --ram 4096 --vcpus 6 --cpu
> > > host-passthrough --accelerate \ --network
> > > network:pxe,model=virtio-net-pci \ --network
> > > network:mgmt,model=virtio-net-pci \ --network
> > > network:internal,model=virtio-net-pci \ --network
> > > network:public,model=virtio-net-pci \ --console pty --autostart
> > > --noreboot --noautoconsole --video=vga --noautoconsole [...]
> > >
> > > You might notice I had to disable legacy virtio in the domain XML,
> > > or the
> > guest would complain about a missing F_... property and no guest
> > network interfaces would be detected.
> >
> > You shouldn't need to do this disable-legacy stuff when using PCIe
> > ports, as the virtio devices will automatically use virtio-1.0 ("modern").
> >
> > >
> > > For now, since we only need 4 guest interfaces, we switched one of
> > > them
> > back to virtio-mmio, and everything is working as expected.
> > > Unfortunately I can't investigate this myself right now, but I can
> > > provide
> > additional details if needed for someone else to look into it.
> >
> > I just checked on my setup (RH qemu based on 2.9, RH libvirt based on
> > 3.2). I used Fedora 26's virt-manager from my x86 notebook, remotely
> > connecting to my AArch64 host, in order to create four networks and a
> > guest that has them all attached to four virtio nics. It worked without a 
> > hitch.
> 
> Good to know this is specific to my setup, I was afraid this is a real issue.
> I'll retest using all suggestions above and get back with the rootcause.
> 
> Thank you,
> Alex
> 
> >
> > Thanks,
> > drew
> >
> > >
> > > BR,
> > > Alex
> > >
> > > ---
> > > Network definitions:
> > > ---
> > > <network>
> > >   <name>pxe</name>
> > >   <forward mode='nat'/>
> > >   <bridge name='pxe' stp='on' delay='0'/>
> > >   <ip address='192.168.10.1' netmask='255.255.255.0'>
> > >     <dhcp>
> > >       <range start='192.168.10.100' end='192.168.10.254'/>
> > >     </dhcp>
> > >   </ip>
> > > </network>
> > >
> > > <network>
> > >   <name>mgmt</name>
> > >   <bridge name='mgmt' stp='on' delay='0'/>
> > >   <ip address='172.16.10.1' netmask='255.255.255.0'>
> > >   </ip>
> > > </network>
> > >
> > > <network>
> > >   <name>internal</name>
> > >   <bridge name='internal' stp='on' delay='0'/> </network>
> > >
> > > <network>
> > >   <name>public</name>
> > >   <forward mode='nat'/>
> > >   <bridge name='public' stp='on' delay='0'/>
> > >   <ip address='10.16.0.1' netmask='255.255.255.0'>
> > >   </ip>
> > > </network>
> > >
> > > ---
> > > Domain XML:
> > > ---
> > > <domain type='kvm' id='28'
> > xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0'>
> > >   <name>cfg01</name>
> > >   <uuid>3f8415d1-963a-46aa-8a63-1c6558775b92</uuid>
> > >   <memory unit='KiB'>4194304</memory>
> > >   <currentMemory unit='KiB'>4194304</currentMemory>
> > >   <vcpu placement='static'>6</vcpu>
> > >   <resource>
> > >     <partition>/machine</partition>
> > >   </resource>
> > >   <os>
> > >     <type arch='aarch64' machine='virt-2.9'>hvm</type>
> > >     <loader readonly='yes'
> > type='pflash'>/usr/share/AAVMF/AAVMF_CODE.fd</loader>
> > >     <nvram>/var/lib/libvirt/qemu/nvram/cfg01_VARS.fd</nvram>
> > >     <boot dev='hd'/>
> > >   </os>
> > >   <features>
> > >     <acpi/>
> > >     <gic version='3'/>
> > >   </features>
> > >   <cpu mode='host-passthrough' check='none'/>
> > >   <clock offset='utc'/>
> > >   <on_poweroff>destroy</on_poweroff>
> > >   <on_reboot>restart</on_reboot>
> > >   <on_crash>restart</on_crash>
> > >   <devices>
> > >     <emulator>/usr/bin/kvm</emulator>
> > >     <disk type='file' device='disk'>
> > >       <driver name='qemu' type='qcow2' cache='none' io='native'/>
> > >       <source
> > file='/home/jenkins/alav/armband/upstream/fuel/mcp/scripts/images/mcp
> > _cfg01.qcow2'/>
> > >       <backingStore/>
> > >       <target dev='vda' bus='virtio'/>
> > >       <alias name='virtio-disk0'/>
> > >       <address type='pci' domain='0x0000' bus='0x04' slot='0x00'
> > function='0x0'/>
> > >     </disk>
> > >     <disk type='file' device='cdrom'>
> > >       <driver name='qemu' type='raw'/>
> > >       <source
> > file='/home/jenkins/alav/armband/upstream/fuel/mcp/scripts/images/mcp
> > _cfg01.iso'/>
> > >       <backingStore/>
> > >       <target dev='sda' bus='scsi'/>
> > >       <readonly/>
> > >       <alias name='scsi0-0-0-0'/>
> > >       <address type='drive' controller='0' bus='0' target='0' unit='0'/>
> > >     </disk>
> > >     <controller type='scsi' index='0' model='virtio-scsi'>
> > >       <alias name='scsi0'/>
> > >       <address type='pci' domain='0x0000' bus='0x03' slot='0x00'
> > function='0x0'/>
> > >     </controller>
> > >     <controller type='pci' index='0' model='pcie-root'>
> > >       <alias name='pcie.0'/>
> > >     </controller>
> > >     <controller type='pci' index='1' model='dmi-to-pci-bridge'>
> > >       <model name='i82801b11-bridge'/>
> > >       <alias name='pci.1'/>
> > >       <address type='pci' domain='0x0000' bus='0x00' slot='0x01'
> > function='0x0'/>
> > >     </controller>
> > >     <controller type='pci' index='2' model='pci-bridge'>
> > >       <model name='pci-bridge'/>
> > >       <target chassisNr='2'/>
> > >       <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='0x10'/>
> > >       <alias name='pci.3'/>
> > >       <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
> > function='0x0' multifunction='on'/>
> > >     </controller>
> > >     <controller type='pci' index='4' model='pcie-root-port'>
> > >       <model name='pcie-root-port'/>
> > >       <target chassis='4' port='0x11'/>
> > >       <alias name='pci.4'/>
> > >       <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
> > function='0x1'/>
> > >     </controller>
> > >     <controller type='pci' index='5' model='pcie-root-port'>
> > >       <model name='pcie-root-port'/>
> > >       <target chassis='5' port='0x12'/>
> > >       <alias name='pci.5'/>
> > >       <address type='pci' domain='0x0000' bus='0x00' slot='0x02'
> > function='0x2'/>
> > >     </controller>
> > >     <interface type='network'>
> > >       <mac address='52:54:00:ae:48:81'/>
> > >       <source network='pxe' bridge='pxe'/>
> > >       <target dev='vnet0'/>
> > >       <model type='virtio-net-pci'/>
> > >       <alias name='net0'/>
> > >       <address type='pci' domain='0x0000' bus='0x02' slot='0x01'
> > function='0x0'/>
> > >     </interface>
> > >     <interface type='network'>
> > >       <mac address='52:54:00:36:2c:a9'/>
> > >       <source network='mgmt' bridge='mgmt'/>
> > >       <target dev='vnet1'/>
> > >       <model type='virtio-net-pci'/>
> > >       <alias name='net1'/>
> > >       <address type='pci' domain='0x0000' bus='0x02' slot='0x02'
> > function='0x0'/>
> > >     </interface>
> > >     <interface type='network'>
> > >       <mac address='52:54:00:43:ce:03'/>
> > >       <source network='internal' bridge='internal'/>
> > >       <target dev='vnet2'/>
> > >       <model type='virtio-net-pci'/>
> > >       <alias name='net2'/>
> > >       <address type='pci' domain='0x0000' bus='0x02' slot='0x03'
> > function='0x0'/>
> > >     </interface>
> > >     <interface type='network'>
> > >       <mac address='52:54:00:37:e6:0e'/>
> > >       <source network='public' bridge='public'/>
> > >       <target dev='vnet3'/>
> > >       <model type='virtio-net-pci'/>
> > >       <alias name='net3'/>
> > >       <address type='pci' domain='0x0000' bus='0x02' slot='0x04'
> > function='0x0'/>
> > >     </interface>
> > >     <serial type='pty'>
> > >       <source path='/dev/pts/0'/>
> > >       <target port='0'/>
> > >       <alias name='serial0'/>
> > >     </serial>
> > >     <console type='pty' tty='/dev/pts/0'>
> > >       <source path='/dev/pts/0'/>
> > >       <target type='serial' port='0'/>
> > >       <alias name='serial0'/>
> > >     </console>
> > >     <graphics type='vnc' port='5900' autoport='yes' listen='127.0.0.1'>
> > >       <listen type='address' address='127.0.0.1'/>
> > >     </graphics>
> > >     <video>
> > >       <model type='vga' vram='16384' heads='1' primary='yes'/>
> > >       <alias name='video0'/>
> > >       <address type='pci' domain='0x0000' bus='0x02' slot='0x05'
> > function='0x0'/>
> > >     </video>
> > >   </devices>
> > >   <seclabel type='dynamic' model='apparmor' relabel='yes'>
> > >     <label>libvirt-3f8415d1-963a-46aa-8a63-1c6558775b92</label>
> > >     <imagelabel>libvirt-3f8415d1-963a-46aa-8a63-
> > 1c6558775b92</imagelabel>
> > >   </seclabel>
> > >   <seclabel type='dynamic' model='dac' relabel='yes'>
> > >     <label>+113:+115</label>
> > >     <imagelabel>+113:+115</imagelabel>
> > >   </seclabel>
> > >   <qemu:commandline>
> > >     <qemu:arg value='-global'/>
> > >     <qemu:arg value='virtio-pci.disable-legacy=on'/>
> > >   </qemu:commandline>
> > > </domain>
> > >



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