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:
1. 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.
2. What are the supported GPU types? (GRID GPU or GPUs attached to physical blades )
both
3. 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.
4. What are the virtualization options if vGPU options are not supported by a particular GPU model?
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. pci passthough of the fulll gpu or sriov if the card supprots that.
Thanks in advance, Krish
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Alvaro Soto
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