On 07/19/2016 06:51 PM, Ed Leafe wrote:
On Jul 19, 2016, at 2:58 PM, Chris Friesen
<chris.frie...@windriver.com> wrote:
Why would a VM program the slot? Wouldn’t it usually be at the
host level?
Are there no cases where a VM might want to download a proprietary
program into an FPGA?
That doesn’t sound right to me, but maybe I’m just not that familiar
with FPGA specifics. In general, VMs don’t control their hosts.
Oh, but in NFV-land they most certainly do. :/
It's commonplace now to see NFV use cases where VMs are provided
passthrough access to an SR-IOV physical function on the host and the
VMs application code then controls and allocates at will virtual
functions from that physical function. Once that happens, yes, it's true
that Nova no longer has any clue about the resource usage of VFs on that
host device -- it's essentially at that point totally up to the VNF
software to properly manage and maintain access to those VFs and
allocate/free resources as needed on the host device.
Same goes for FPGAs. VNF vendors want access to the physical host device
and want to be able to do with that host device whatever they please.
As I wrote on Twitter recently, NFV is changing software-defined
infrastructure to instead be hardware-defined software.
It's a funky new* world we live in, Ed :)
-jay
* new == old == new again.
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