[Xen-users] Hotplugging FPGA to running VM

[Anil Rao <anil.rao@xxxxxxxxxxxx>]

Hi,

 

I am trying to assign a FPGA (which is a PCI device) to a running VM. The interesting thing here is that the FPGA is not present when the VM was powered-on. I.e. sometime after the VM was started, the FPGA was brought on-line on the host by downloading its image to the device.

 

So far my attempts at using Xen PCI-passthrough have not been successful. Although Xen reports that the pass-through operation was successful, which I have verified using the appropriate xl command, I am unable to see the FPGA from within the guest OS.

 

I have tried both manual rescanning of the PCI bus inside the guest as well as making use of the pciehp driver. The only way I can (reliably) see the FPGA from within the guest, is to shutdown and restart the VM and then redo the hotplug operation. I want to avoid a VM reboot and was wondering if this is at all possible and if so what do I need to do to realize it.

 

[The virtualization host is based on the default Xen setup that comes with SLES 11 SP2]

 

Thanks for any help on this matter.

 

-Anil

 

 

 

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