{"id":9443,"date":"2025-04-16T11:19:15","date_gmt":"2025-04-16T11:19:15","guid":{"rendered":"https:\/\/www.gpu4host.com\/knowledge-base\/?p=9443"},"modified":"2025-04-16T11:20:59","modified_gmt":"2025-04-16T11:20:59","slug":"openstack-gpu-passthrough-fix","status":"publish","type":"post","link":"https:\/\/www.gpu4host.com\/knowledge-base\/openstack-gpu-passthrough-fix\/","title":{"rendered":"OpenStack GPU Passthrough Fix"},"content":{"rendered":"<div class='epvc-post-count'><span class='epvc-eye'><\/span>  <span class=\"epvc-count\"> 976<\/span><span class='epvc-label'> Views<\/span><\/div>\n<h2 class=\"wp-block-heading\"><strong>OpenStack GPU Passthrough Fix: Resolve Instance Launch Issue<\/strong><\/h2>\n\n\n\n<p>OpenStack is a well-known cloud infrastructure platform utilized to quickly deploy flexible and scalable virtualized settings. But in the case of GPU acceleration, all things can get a little tricky\u2014mainly when you are coping with GPU passthrough problems. A general issue that administrators face is the time an instance fails to launch just because of a wrong GPU passthrough setup. This guide is engineered to help you implement a practical OpenStack GPU passthrough fix and get your virtual machines (VMs) running without any issues.<\/p>\n\n\n\n<p>Even if you are utilizing an NVIDIA A40, A100, V100, or handling a GPU server, <a href=\"https:\/\/www.infinitivehost.com\/gpu-dedicated-server\" target=\"_blank\" rel=\"noopener\">GPU dedicated server<\/a>, or a GPU cluster, this whole guide breaks down all required solutions gradually. The OpenStack GPU Passthrough Fix tactic given here guarantees a clean passthrough configuration that functions across high-performance settings.<\/p>\n\n\n\n<p>By following this guide, you&#8217;ll not only troubleshoot the error but also get the full confidence to manage GPU passthrough for high-level GPU tasks.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Required Conditions:<\/strong><\/h2>\n\n\n\n<p>Before applying the OpenStack GPU Passthrough Fix, ensure:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>You have full admin access to the hypervisor node or GPU server.<\/li>\n\n\n\n<li>The host system generally supports AMD-Vi (for AMD) or VT-d (for Intel).<\/li>\n\n\n\n<li>The GPU (for example, <a href=\"https:\/\/www.gpu4host.com\/nvidia-v100-hosting\">NVIDIA V100<\/a>, A100, or A40) is not being utilized by the host system.<\/li>\n\n\n\n<li>IOMMU is allowed in both BIOS and kernel.<\/li>\n\n\n\n<li>You are utilizing a supported hypervisor (such as QEMU\/KVM).<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Step-by-Step OpenStack GPU Passthrough Fix<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"768\" height=\"288\" src=\"https:\/\/www.gpu4host.com\/knowledge-base\/wp-content\/uploads\/2025\/04\/Step-by-Step-OpenStack-GPU-Passthrough-Fix.webp\" alt=\"OpenStack GPU Passthrough Fix\" class=\"wp-image-9447\" srcset=\"https:\/\/www.gpu4host.com\/knowledge-base\/wp-content\/uploads\/2025\/04\/Step-by-Step-OpenStack-GPU-Passthrough-Fix.webp 768w, https:\/\/www.gpu4host.com\/knowledge-base\/wp-content\/uploads\/2025\/04\/Step-by-Step-OpenStack-GPU-Passthrough-Fix-300x113.webp 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 1: Enable IOMMU<\/strong><\/h3>\n\n\n\n<p>Simply edit your GRUB setup on the compute node:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-e2b1299d0cdf018f6f75a2c86290b67f\">sudo nano \/etc\/default\/grub<\/p>\n\n\n\n<p>For Intel-based CPUs, include:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-5a38d299ec2c713fa507bd02ed7b9e91\">GRUB_CMDLINE_LINUX_DEFAULT=&#8221;intel_iommu=on&#8221;<\/p>\n\n\n\n<p>For AMD-based CPUs, include:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-32a855d11816c4918feb96dca79b5d0f\">GRUB_CMDLINE_LINUX_DEFAULT=&#8221;amd_iommu=on&#8221;<\/p>\n\n\n\n<p>To update GRUB:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-125ac57759bacd94d6e1692b487419bc\">sudo update-grub<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-4a369677fa4c2b155324ad684c54efe4\">sudo reboot<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 2: Check Your GPU<\/strong><\/h3>\n\n\n\n<p>List every GPU device possible:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-46ff28f399e775e468718535e6e2cc47\">lspci -nn | grep -i nvidia<\/p>\n\n\n\n<p>After that, just note the PCI address of the GPU you have to passthrough. For instance:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-a699415f09b5afe38efb06dc822e8531\">0000:3b:00.0 VGA compatible controller: NVIDIA Corporation A100<\/p>\n\n\n\n<p>Utilize this address in your setup.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 3: Bind GPU to VFIO-PCI<\/strong><\/h3>\n\n\n\n<p>Avoid the host from utilizing the GPU and bind it to the vfio-pci driver:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-5c15411e13be0dccab9368a5423e5724\">echo &#8220;vendor_id device_id&#8221; &gt; \/sys\/bus\/pci\/drivers\/vfio-pci\/new_id<\/p>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-0e72103f102dfe9682a7b0ef966c6d50\">Or utilize modprobe:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-bfa3f908bc5ac3940d70501c0c575de9\">sudo modprobe vfio-pci<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-f0f4cc31b17685c792cdc768d51c0b61\">echo 0000:3b:00.0 &gt; \/sys\/bus\/pci\/devices\/0000:3b:00.0\/driver\/unbind<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-cec0da51b192e6fa70b68f83ca7e5a33\">echo 0000:3b:00.0 &gt; \/sys\/bus\/pci\/drivers\/vfio-pci\/bind<\/p>\n\n\n\n<p>For constant binding, develop a file such as:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-a3fb02723bc8c49de25c77da194c8613\">\/etc\/modprobe.d\/vfio.conf<\/p>\n\n\n\n<p>Include:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-8b41738227a9956ed8d478c5116ec51c\">options vfio-pci ids=vendor_id:device_id<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 4: Update Nova Compute Setup<\/strong><\/h3>\n\n\n\n<p>Update your nova.conf file:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-49384ad617769d46e0512ef9f3fee9f5\">sudo nano \/etc\/nova\/nova.conf<\/p>\n\n\n\n<p>Include the following to [DEFAULT]:<\/p>\n\n\n\n<p>compute_driver=libvirt.LibvirtDriver<\/p>\n\n\n\n<p>Under [devices] or [pci] (as per your OpenStack version):<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-d2c7974324c92cbebf9b2f6e7aa878b7\">[pci]<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-8e5c2da1025c61c7162f1a796edd885b\">passthrough_whitelist = [{&#8220;vendor_id&#8221;:&#8221;10de&#8221;,&#8221;product_id&#8221;:&#8221;1db6&#8243;,&#8221;address&#8221;:&#8221;0000:3b:00.0&#8243;}]<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-80a1216c6ff427d10fd1bfa03b949cb4\">alias = [{&#8220;name&#8221;:&#8221;a100&#8243;,&#8221;product_id&#8221;:&#8221;1db6&#8243;,&#8221;vendor_id&#8221;:&#8221;10de&#8221;}]<\/p>\n\n\n\n<p>In the [libvirt] segment:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-fc7b406dda70118ba2790c1e3249c6be\">virt_type=kvm<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-0d1950593cc6bf62a4305034a08f2565\">cpu_mode=host-passthrough<\/p>\n\n\n\n<p>Restart the nova-compute service:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-4a9d45dffacbf81a62d0d8150331018f\">sudo systemctl restart nova-compute<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 5: Develop a Flavor with GPU Alias<\/strong><\/h3>\n\n\n\n<p>To schedule instances with the help of a GPU, develop a custom flavor:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-954dc9cf63e773fe05ee3b6694ef00e9\">openstack flavor create gpu.large &#8211;ram 32768 &#8211;disk 100 &#8211;vcpus 8<\/p>\n\n\n\n<p>Then include an extra spec to utilize the GPU:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-49de04e3eb0dd4b607717aa9c7f5f3cb\">openstack flavor set gpu.large &#8211;property &#8220;pci_passthrough:alias&#8221;=&#8221;a100:1&#8221;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Step 6: Launch the Instance<\/strong><\/h3>\n\n\n\n<p>Make sure that the image supports NVIDIA GPU drivers (for example, Ubuntu 20.04 + CUDA).<\/p>\n\n\n\n<p>Launch your required instance:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-5f6d4ae4a7d2c845c3a693e9fc4375c4\">openstack server create &#8211;flavor gpu.large &#8211;image &lt;gpu-enabled-image&gt; &#8211;network &lt;net-id&gt; &#8211;key-name &lt;key&gt; &lt;instance-name&gt;<\/p>\n\n\n\n<p>If done properly, the instance should now launch with enabled GPU passthrough.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Troubleshooting Common Issues<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"768\" height=\"288\" src=\"https:\/\/www.gpu4host.com\/knowledge-base\/wp-content\/uploads\/2025\/04\/Troubleshooting-Common-Issues-1.webp\" alt=\"OpenStack GPU Passthrough Fix\" class=\"wp-image-9446\" srcset=\"https:\/\/www.gpu4host.com\/knowledge-base\/wp-content\/uploads\/2025\/04\/Troubleshooting-Common-Issues-1.webp 768w, https:\/\/www.gpu4host.com\/knowledge-base\/wp-content\/uploads\/2025\/04\/Troubleshooting-Common-Issues-1-300x113.webp 300w\" sizes=\"(max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<p class=\"has-black-color has-text-color has-link-color wp-elements-bcc3a07c1be884dfb728952db3e0842b\"><strong>Problem 1:<\/strong> The instance fails with &#8220;No valid host was found.&#8221;<br><strong>Solution 1:<\/strong> Check nova-compute.log for PCI passthrough issues. Check GPU is adequately bound to vfio-pci and shown in the whitelist.<\/p>\n\n\n\n<p><strong>Problem 1:<\/strong> The host is still utilizing the GPU.<br><strong>Solution 1:<\/strong> Make sure that the host operating system isn&#8217;t loading the nouveau or nvidia drivers. Blacklist them using:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-5c7da2532fa9fb0d6e8b82c4afb3b564\">\/etc\/modprobe.d\/blacklist.conf<\/p>\n\n\n\n<p>Include:<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-2898cbb30a43367ea64307fc45486952\">blacklist nouveau<\/p>\n\n\n\n<p class=\"has-vivid-green-cyan-color has-text-color has-link-color wp-elements-ae84f57243d05a1a63591aa2d3d57a11\">blacklist nvidia<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Best Tips for OpenStack GPU Passthrough Fix<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Try to utilize a <a href=\"https:\/\/www.infinitivehost.com\/gpu-dedicated-server\" target=\"_blank\" rel=\"noopener\">GPU dedicated server<\/a> for trustworthy isolation.<\/li>\n\n\n\n<li>Use GPU clusters at the time of scaling horizontally.<\/li>\n\n\n\n<li>Make sure to install the right NVIDIA drivers in your guest operating system.<\/li>\n\n\n\n<li>Certify hardware compatibility (mainly with NVIDIA A40, A100, or V100 GPUs).<\/li>\n\n\n\n<li>Utilize GPU4HOST for pre-setup GPU solutions enhanced for OpenStack settings.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Reasons to Choose GPU4HOST for GPU Passthrough in OpenStack<\/strong><\/h2>\n\n\n\n<p>GPU4HOST offers cutting-edge GPU servers well-fortified with NVIDIA A40, V100, and A100 cards, making GPU passthrough smooth and productive. Even if you are running AI-based tasks, 3D graphic rendering, or complex simulations, GPU4HOST offers:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Complete support for OpenStack GPU passthrough fix setups<\/li>\n\n\n\n<li>Enterprise-level GPU dedicated server<\/li>\n\n\n\n<li>Instant deploy GPU clusters, especially for scaling<\/li>\n\n\n\n<li>24\/7 professional support for GPU integrations<\/li>\n<\/ul>\n\n\n\n<p>By choosing GPU4HOST, you can save a lot of time resolving hardware compatibility and can emphasize more on running your apps seamlessly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Fixing OpenStack GPU passthrough problems can be more challenging, mainly at the time of dealing with advanced settings that depend completely on GPU servers powered by the <a href=\"https:\/\/www.gpu4host.com\/nvidia-a40-hosting\">NVIDIA A40<\/a>, V100, or A100. However, with all the steps that are mentioned in this guide, you should now have a proper pathway to troubleshoot the instance launch issue that occurred because of passthrough issues.<\/p>\n\n\n\n<p>Even if you are deploying AI-based models, training deep learning algorithms, or leveraging a <a href=\"https:\/\/www.gpu4host.com\/gpu-cluster\">GPU cluster<\/a>, correct passthrough configuration guarantees high performance and stability. For all those experts who are opting to scale with full confidence, consider using high-performance GPU solutions such as those provided by GPU4HOST \u2014 a trustworthy partner for a GPU dedicated server and cloud GPU settings customized for challenging tasks.<\/p>\n\n\n\n<p>With the help of the OpenStack GPU Passthrough Fix in place, you\u2019re fully ready to harness the potential of virtualization and GPU boost in your powerful infrastructure.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>976 Views OpenStack GPU Passthrough Fix: Resolve Instance Launch Issue OpenStack is a well-known cloud infrastructure platform utilized to quickly deploy flexible and scalable virtualized settings. But in the case of GPU acceleration, all things can get a little tricky\u2014mainly when you are coping with GPU passthrough problems. A general issue that administrators face is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":9444,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-9443","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web-hosting"],"_links":{"self":[{"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/posts\/9443","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/comments?post=9443"}],"version-history":[{"count":1,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/posts\/9443\/revisions"}],"predecessor-version":[{"id":9448,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/posts\/9443\/revisions\/9448"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/media\/9444"}],"wp:attachment":[{"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/media?parent=9443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/categories?post=9443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gpu4host.com\/knowledge-base\/wp-json\/wp\/v2\/tags?post=9443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}