[CentOS-virt] Setting up a pci passthrough device

[James B. Byrne]

Evidently I should be using

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Host_Configuration_and_Guest_Installation_Guide/chap-Virtualization_Host_Configuration_and_Guest_Installation_Guide-PCI_Assignment.html

Which I had looked for but google apparently does not
report.  I had to search the RedHat web site using their
search interface to locate it.  The other site purports to
be a rhel6 essentials book.

Nonetheless, while the inconsistencies of the previous
documents are resolved in this new reference the example
edit of the virtual guest configuration still fails to
provide a context for the insertion:

# virsh edit guest1-rhel6-64
<hostdev mode='subsystem' type='pci' managed='yes'>
  <source>
     <address domain='0x000' bus='0x03' slot='0x00'
function='0x0'/>
  </source>
</hostdev>


Where does this go inside the rest of the guest
configuration?

<domain type='kvm'>
  <name>inet08.harte-lyne.ca</name>
  <uuid>6409d721-cfcf-2169-f65e-8f583b685f58</uuid>
  <description>Inet08  [216.185.71.28] virtual hosts:
  none</description>
  <memory>4194304</memory>
  <currentMemory>4194304</currentMemory>
  <vcpu>1</vcpu>
  <os>
    <type arch='x86_64' machine='rhel6.2.0'>hvm</type>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/libexec/qemu-kvm</emulator>
    <disk type='block' device='disk'>
      <driver name='qemu' type='raw' cache='none'
io='native'/>
      <source
dev='/dev/vg_vhost01/lv_vm_inet08.harte-lyne.ca_00'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x05' function='0x0'/>
    </disk>
    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <address type='drive' controller='0' bus='1' unit='0'/>
    </disk>
    <controller type='ide' index='0'>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x1'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:bf:e9:ac'/>
      <source bridge='br0'/>
      <model type='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target port='0'/>
    </serial>
    <serial type='dev'>
      <source path='/dev/ttyS0'/>
      <target port='1'/>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <input type='tablet' bus='usb'/>
    <input type='mouse' bus='ps2'/>
    <graphics type='vnc' port='-1' autoport='yes'/>
    <sound model='ich6'>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x04' function='0x0'/>
    </sound>
    <video>
      <model type='cirrus' vram='9216' heads='1'/>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x02' function='0x0'/>
    </video>
    <memballoon model='virtio'>
      <address type='pci' domain='0x0000' bus='0x00'
slot='0x06' function='0x0'/>
    </memballoon>
  </devices>
</domain>

I have tried placing the <hostdev> tags after the
<devices> tag but the changes simply disappear.

-- 
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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
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