Re: [Qemu-devel] Help: Does Qemu support virtio-pci for net-device and disk device?

[Andrea Bolognani <abologna@redhat.com>]

On Thu, 2016-08-18 at 20:43 +0800, Kevin Zhao wrote:
> What's the minimum version of  Qemu that support virito-1.0?
> Does Qemu 2.6 works? 

2.6 definitely has virtio 1.0 support, however libvirt does
not yet allow you to control whether a device uses 0.9, 1.0
or both. The default for 2.6 should be both IIRC.

> Now I will manually add the slots and bus to pcie. Because
> I am not familiar with it,  if it convenient, could you give
> me an available xml file which PCIE disk and PCIE
> net device can work for machine virt ?

The XML you're looking for is at the end of this message.

Note that a Fedora 24 guest configured this way will not
boot at all if the machine type is virt-2.6; on the other
hand, an identically-configured RHEL 7.3 guest will boot
even with virt-2.6, but both the disk and the network
adapter will be legacy PCI instead of PCIe.


<domain type='kvm'>
  <name>abologna-f24</name>
  <uuid>f6d0428b-a034-4c4e-8ef2-f12f6aa9cab0</uuid>
  <memory unit='KiB'>2097152</memory>
  <currentMemory unit='KiB'>2097152</currentMemory>
  <vcpu placement='static'>4</vcpu>
  <os>
    <type arch='aarch64' machine='virt-2.7'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/AAVMF/AAVMF_CODE.fd</loader>
    <nvram>/var/lib/libvirt/qemu/nvram/abologna-f24_VARS.fd</nvram>
    <boot dev='hd'/>
  </os>
  <features>
    <gic version='2'/>
  </features>
  <cpu mode='host-passthrough'/>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/libexec/abologna-qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/var/lib/libvirt/images/abologna-f24.qcow2'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x01' slot='0x00' 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'/>
    </controller>
    <controller type='pci' index='2' model='pcie-root-port'>
      <model name='ioh3420'/>
      <target chassis='2' port='0x10'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <address type='virtio-mmio'/>
    </controller>
    <interface type='network'>
      <mac address='52:54:00:10:07:41'/>
      <source network='default'/>
      <model type='virtio'/>
      <rom bar='off'/>
      <address type='pci' domain='0x0000' bus='0x02' slot='0x00' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <channel type='unix'>
      <source mode='bind'/>
      <target type='virtio' name='org.qemu.guest_agent.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
  </devices>
</domain>

-- 
Andrea Bolognani / Red Hat / Virtualization