refactor: Remove CPU pinning config and docs from nova gpu DT/VA

Isolcpus shoudl not be used on non realtime systems or on non nfv
systems. We consider that to be a bad practics and technically
unsupproted by the compute team.

Also neither edpm_tuned_isolated_cores nor isolcpus is required to use
cpu pinning. And edpm_tuned_isolated_cores is recommend but still
optional.

Omit those alltogether for a nova04delta full GPU device passthrough,
and its related nova-vfio-passthrough VA.

Co-authored-by: aider (gemini/gemini-2.5-pro) <[email protected]>

Author: bogdando

dt/nova/nova04delta/edpm/nodeset/kustomization.yaml

@@ -38,19 +38,6 @@ replacements:
         options:
           create: true
 
-  # Nova compute CPU pinning customization
-  - source:
-      kind: ConfigMap
-      name: edpm-nodeset-values
-      fieldPath: data.nova.compute.conf
-    targets:
-      - select:
-          kind: ConfigMap
-          name: cpu-pinning-nova
-        fieldPaths:
-          - data.25-cpu-pinning-nova\.conf
-        options:
-          create: true
   # Nova compute PCI passthrough customization
   - source:
       kind: ConfigMap

dt/nova/nova04delta/edpm/nodeset/nova_gpu.yaml

@@ -1,11 +1,3 @@
----
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: cpu-pinning-nova
-data:
-  25-cpu-pinning-nova.conf: _replaced_
----
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -21,8 +13,6 @@ spec:
   label: dataplane-deployment-nova-custom-gpu
   edpmServiceType: nova
   dataSources:
-    - configMapRef:
-        name: cpu-pinning-nova
     - configMapRef:
         name: gpu-nova
     - secretRef:

dt/nova/nova04delta/edpm/nodeset2/kustomization.yaml

@@ -38,19 +38,6 @@ replacements:
         options:
           create: true
 
-  # Nova compute CPU pinning customization
-  - source:
-      kind: ConfigMap
-      name: edpm-nodeset-values
-      fieldPath: data.nova.compute.conf
-    targets:
-      - select:
-          kind: ConfigMap
-          name: cpu-pinning-nova-2
-        fieldPaths:
-          - data.25-cpu-pinning-nova\.conf
-        options:
-          create: true
   # Nova compute PCI passthrough customization
   - source:
       kind: ConfigMap

dt/nova/nova04delta/edpm/nodeset2/nova_gpu.yaml

@@ -1,11 +1,3 @@
----
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: cpu-pinning-nova-2
-data:
-  25-cpu-pinning-nova.conf: _replaced_
----
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -21,8 +13,6 @@ spec:
   label: dataplane-deployment-nova-custom-gpu
   edpmServiceType: nova
   dataSources:
-    - configMapRef:
-        name: cpu-pinning-nova-2
     - configMapRef:
         name: gpu-nova-2
     - secretRef:

examples/dt/nova/nova04delta/README.md

@@ -20,11 +20,6 @@ The following parameters are crucial for host-level configuration:
     *   `intel_iommu=on iommu=pt`: Enables the IOMMU for device passthrough.
     *   `vfio-pci.ids=10de:20f1`: Instructs the `vfio-pci` driver to claim the specified GPU(s) by their vendor and product IDs at boot time. The example IDs `10de:20f1` are for an NVIDIA A100 GPU.
     *   `rd.driver.pre=vfio-pci`: Avoids race conditions during boot by loading vfio-pci kernel module early.
-    *   `isolcpus=...`: Isolates a set of CPUs from the kernel scheduler to be used for dedicated vCPU workloads.
-
-*   `edpm_tuned_profile` and `edpm_tuned_isolated_cores`: These parameters configure the `tuned` service.
-    *   `edpm_tuned_profile` is set to `cpu-partitioning-powersave` to enable CPU isolation features.
-    *   `edpm_tuned_isolated_cores` specifies the cores to be isolated. This should match the list of CPUs provided in the `isolcpus` kernel argument.
 
 *   **VFIO-PCI Binding Service**: The `vfio-pci-bind` service in `dt/nova/nova04delta/edpm/nodeset/nova_gpu.yaml` blacklists the `nouveau` and `nvidia` kernel modules to ensure they do not interfere with the `vfio-pci` driver. The service also regenerates the initramfs and grub configuration to apply these changes. A reboot is required for these changes to take effect.
 
@@ -66,12 +61,10 @@ That is a contrary to the legacy mode where PCI devices used to be requested thr
 In addition to PCI device configuration, the `nova.compute.conf` section includes parameters for resource management on the compute node:
 
 *   `[DEFAULT]reserved_host_memory_mb`: Specifies the amount of memory (in megabytes) to reserve for the host operating system and other non-OpenStack services. This memory will not be available for allocation to virtual machines.
-*   `[compute]cpu_shared_set`: A list of physical CPUs that are available for host processes and for virtual machines that do not have dedicated CPUs (i.e., unpinned VMs). These should be the CPUs that are **not** isolated by `isolcpus` or `edpm_tuned_isolated_cores`.
-*   `[compute]cpu_dedicated_set`: A list of physical CPUs that are exclusively reserved for virtual machines with dedicated CPU pinning policies. To ensure performance isolation, this list should correspond directly to the CPUs isolated using the `isolcpus` kernel argument and `edpm_tuned_isolated_cores` parameter.
 *   `[DEFAULT]reserved_huge_pages`: Defines the number and size of huge pages to reserve for the host, making them unavailable for guest VMs. This configuration works in conjunction with the `hugepages` and `hugepagesz` kernel arguments, which define the total pool of huge pages on the host.
 
 **Note**: In a full device passthrough scenario, the `[devices]enabled_vgpu_types` option in Nova's configuration is not used. This option is specific to mediated device (mdev) configurations.
 
 ## Guest VM
 
-To use the passthrough GPU, the guest operating system inside the VM must have the appropriate native NVIDIA driver installed. You will need a standard NVIDIA driver. Do not use vGPU-enabled guest drivers. The GPU will appear as a physical PCI device within the guest.
+To use the passthrough GPU, the guest operating system inside the VM must have the appropriate native NVIDIA driver installed. You will need a standard NVIDIA driver. Do not use vGPU-enabled guest drivers. The GPU will appear as a physical PCI device within the guest.

examples/dt/nova/nova04delta/edpm/nodeset/values.yaml

@@ -40,10 +40,7 @@ data:
         # GPU passthrough settings for a PCI Vendor and Device ID pair.
         # Here, 10de represents NVIDIA Corporation, and 20f1 corresponds to the GA100 [A100 PCIe 40GB] GPU, according to Device Hunt
         # https://devicehunt.com/view/type/pci/vendor/10DE/device/20F1
-        # The isolcpus=4-23,28-47 is the CPU cores that are isolated from the GPU.
-        edpm_kernel_args: "default_hugepagesz=1GB hugepagesz=1G hugepages=16 intel_iommu=on iommu=pt isolcpus=4-23,28-47 vfio-pci.ids=10de:20f1 rd.driver.pre=vfio-pci"
-        edpm_tuned_profile: "cpu-partitioning-powersave"
-        edpm_tuned_isolated_cores: "4-23,28-47"
+        edpm_kernel_args: "default_hugepagesz=1GB hugepagesz=1G hugepages=16 intel_iommu=on iommu=pt vfio-pci.ids=10de:20f1 rd.driver.pre=vfio-pci"
         # edpm_network_config
         # These vars are edpm_network_config role vars
         edpm_network_config_hide_sensitive_logs: false
@@ -141,9 +138,6 @@ data:
         reserved_host_memory_mb = 4096
         reserved_huge_pages = node:0,size:4,count:524160
         reserved_huge_pages = node:1,size:4,count:524160
-        [compute]
-        cpu_shared_set = 0-3,24-27
-        cpu_dedicated_set = 8-23,32-47
     migration:
       ssh_keys:
         private: CHANGEME4

examples/dt/nova/nova04delta/edpm/nodeset2/values.yaml

@@ -40,10 +40,7 @@ data:
         # GPU passthrough settings for a PCI Vendor and Device ID pair.
         # Here, 10de represents NVIDIA Corporation, and 20f1 corresponds to the GA100 [A100 PCIe 40GB] GPU, according to Device Hunt
         # https://devicehunt.com/view/type/pci/vendor/10DE/device/20F1
-        # The isolcpus=4-23,28-47 is the CPU cores that are isolated from the GPU.
-        edpm_kernel_args: "default_hugepagesz=1GB hugepagesz=1G hugepages=16 intel_iommu=on iommu=pt isolcpus=4-23,28-47 vfio-pci.ids=10de:20f1 rd.driver.pre=vfio-pci"
-        edpm_tuned_profile: "cpu-partitioning-powersave"
-        edpm_tuned_isolated_cores: "4-23,28-47"
+        edpm_kernel_args: "default_hugepagesz=1GB hugepagesz=1G hugepages=16 intel_iommu=on iommu=pt vfio-pci.ids=10de:20f1 rd.driver.pre=vfio-pci"
         # edpm_network_config
         # These vars are edpm_network_config role vars
         edpm_network_config_hide_sensitive_logs: false
@@ -141,9 +138,6 @@ data:
         reserved_host_memory_mb = 4096
         reserved_huge_pages = node:0,size:4,count:524160
         reserved_huge_pages = node:1,size:4,count:524160
-        [compute]
-        cpu_shared_set = 0-3,24-27
-        cpu_dedicated_set = 8-23,32-47
     migration:
       ssh_keys:
         private: CHANGEME4

examples/va/nvidia-vfio-passthrough/edpm/nodeset/kustomization.yaml

@@ -48,18 +48,6 @@ replacements:
           - spec.baremetalSetTemplate
         options:
           create: true
-  - source:
-      kind: ConfigMap
-      name: edpm-nodeset-values
-      fieldPath: data.nova.compute.conf
-    targets:
-      - select:
-          kind: ConfigMap
-          name: cpu-pinning-nova
-        fieldPaths:
-          - data.25-cpu-pinning-nova\.conf
-        options:
-          create: true
   - source:
       kind: ConfigMap
       name: edpm-nodeset-values

examples/va/nvidia-vfio-passthrough/edpm/nodeset/values.yaml

@@ -40,10 +40,7 @@ data:
         # GPU passthrough settings for a PCI Vendor and Device ID pair.
         # Here, 10de represents NVIDIA Corporation, and 20f1 corresponds to the GA100 [A100 PCIe 40GB] GPU, according to Device Hunt
         # https://devicehunt.com/view/type/pci/vendor/10DE/device/20F1
-        # The isolcpus=4-23,28-47 is the CPU cores that are isolated from the GPU.
-        edpm_kernel_args: "default_hugepagesz=1GB hugepagesz=1G hugepages=16 intel_iommu=on iommu=pt isolcpus=4-23,28-47 vfio-pci.ids=10de:20f1 rd.driver.pre=vfio-pci"
-        edpm_tuned_profile: "cpu-partitioning-powersave"
-        edpm_tuned_isolated_cores: "4-23,28-47"
+        edpm_kernel_args: "default_hugepagesz=1GB hugepagesz=1G hugepages=16 intel_iommu=on iommu=pt vfio-pci.ids=10de:20f1 rd.driver.pre=vfio-pci"
         # edpm_network_config
         # These vars are edpm_network_config role vars
         edpm_network_config_hide_sensitive_logs: false
@@ -141,9 +138,6 @@ data:
         reserved_host_memory_mb = 4096
         reserved_huge_pages = node:0,size:4,count:524160
         reserved_huge_pages = node:1,size:4,count:524160
-        [compute]
-        cpu_shared_set = 0-3,24-27
-        cpu_dedicated_set = 8-23,32-47
     migration:
       ssh_keys:
         private: CHANGEME4

va/nvidia-vfio-passthrough/edpm/nodeset/kustomization.yaml

@@ -38,19 +38,6 @@ replacements:
         options:
           create: true
 
-  # Nova compute CPU pinning customization
-  - source:
-      kind: ConfigMap
-      name: edpm-nodeset-values
-      fieldPath: data.nova.compute.conf
-    targets:
-      - select:
-          kind: ConfigMap
-          name: cpu-pinning-nova
-        fieldPaths:
-          - data.25-cpu-pinning-nova\.conf
-        options:
-          create: true
   # Nova compute PCI passthrough customization
   - source:
       kind: ConfigMap