[Openstack] Assigning of specific PCI device to VM (pci passthrough)

Chinmaya Dwibedy ckdwibedy at gmail.com
Fri May 20 05:30:28 UTC 2016

Hi All,

I cannot assign 2 same type PCI pass-through Ethernet devices to 2 VM
instances separately. Can you please let me know how to accomplish the
same? Thanks in advance for your time and help.



On Thu, May 19, 2016 at 7:25 PM, Chinmaya Dwibedy <ckdwibedy at gmail.com>

> Hi,
> Can we assign two same type PCI pass-through devices (Ethernet cards) to 2
> different VM instances separately? Please note that, both the cards have
> same vendor_id and product_id.
> I configured it in pci_passthrough_whitelist and create two different
> pci_alias (Say a1 and a2). Modified the Nova flavor to use a1 by VM1 and
> VM2. Followed the procedures mentioned at
> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Administration_Guide/chap-Guest_virtual_machine_device_configuration.html
> With this edited xml files of both the instances (after shutting down).
> Added a device entry in the <source> section to assign the PCI device to
> the guest virtual machine. and accordingly configured domain, bus, slot and
> function. Restarted the VMs using #virsh start command. Made an Query pci
> device in nova DB and found that two Ethernet PCI devices have been
> assigned to single VM.
> Please correct me if I am wrong.
> Regards,
> Chinmaya
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