On Wed, Aug 10, 2022 at 1:23 PM Danny Webb Danny.Webb@thehutgroup.com wrote:
worth also mentioning that MIG isn't currently supported in Openstack. We just finished a POC with some a100 and a40 cards and the vgpu setup wasn't too hard to do, but you definitely needed to read a combination of the NVIDIA docs and the openstack docs to get a working setup.
actually from a nova perspective mig is supported however you have to preconfigure the devices.
mig just moves the mdevs to the VFs and you need to precreate the VFs and gpu compute instances but we dont plan to change that going forward. https://bugs.launchpad.net/nova/+bug/1900800 is a valid bug but its not related to mig. recreating the mdevs on host reboot is a complex task currently but its being worked on.
There is one open bug for mediated devices that you should be aware of though it looks like a fix is in the works:
https://bugs.launchpad.net/nova/+bug/1900800
For straight PCI passthrough I found some of the tooling around it in openstack lacking compared to for the vgpu devices but that may have just been me missing something. Eg, I could only really see the PCI devices in the DB but couldn't find a way to see them using the SDK / cli.
yes that is by design rather then an oversight, we are chanign that in the zed cycle as we will start trracking pci device in placement going forward. but our intent is not to expose them via the nova api.
From: Sean Mooney smooney@redhat.com Sent: 10 August 2022 11:23 To: Alvaro Soto alsotoes@gmail.com Cc: KK CHN kkchn.in@gmail.com; openstack-discuss openstack-discuss@lists.openstack.org Subject: Re: Openstack Graphical processors virtualisation
CAUTION: This email originates from outside THG
our main vgpu expert is on PTO for a few weeks but ill try and respond inline.
On Wed, Aug 10, 2022 at 8:07 AM Alvaro Soto alsotoes@gmail.com wrote:
Hey, just a little help with one question.
1- https://docs.openstack.org/nova/yoga/admin/virtual-gpu.html https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/...
yep thos are the docs for nova's vGPU support we also support pci passthough of a full gpu to a vm for usecause that need that.
On Wed, Aug 10, 2022 at 1:17 AM KK CHN kkchn.in@gmail.com wrote:
- Does Openstack support GPU virtualization ? We are running a cloud using ussuri with KVM hypervisors. Is creation of vGPUs possible?
yes if you have an nvidia gpu and pay for there licnese server ectra you can config nova to expose those vgpus to the guests. if you have amd gpus and those support there mxgpu feature then that just exposes the vGPUs as stanard sriov VFs instead of vfio-mediated devices so you use pci passthough instead of the vGPU mdev feature in that case to consume them.
Does KVM support GPU virtualization or any limitations?
yes however nvidia have not yet upstream support for vgpu/mdev live migration. redhat nvidia and others are currently activly working on upstreamoing that to the kernel qemu and libvirt but that is the main limiation. depending on your release nova also does not support move operations like cold migration however those have been added in more recent releases.
- What are the supported GPU types? (GRID GPU or GPUs attached to physical blades )
both
- If it supports GPU attached to physical blades, will live migration of the VM be supported.Will OpenStack be able to identify the next host which has an attached GPU and perform live migration, in case of the Failure of One Blade with attached GPU with resident VM.
no live migration is not possibel with mdev or sriov vf attachment currently. cold migration and evacuate are supported in more recent releases of openstack in the case of maintance or hardware failure.
- What are the virtualization options if vGPU options are not supported by a particular GPU model?
pci passthough of the fulll gpu or sriov if the card supprots that.
Thanks in advance, Krish
--
Alvaro Soto
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Danny Webb Principal OpenStack Engineer The Hut Group
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