feat(kubevirt): OCPBUGS-55974: add CPU model configuration for NodePool VMs - #7431
feat(kubevirt): OCPBUGS-55974: add CPU model configuration for NodePool VMs#7431orenc1 wants to merge 1 commit into
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@orenc1: This pull request references Jira Issue OCPBUGS-55974, which is invalid:
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📝 WalkthroughWalkthroughAdds the Sequence Diagram(s)sequenceDiagram
participant NodePoolAPI
participant KubeVirtController
participant VMTemplate
participant NodePoolConditions
NodePoolAPI->>KubeVirtController: provide Compute.Model
KubeVirtController->>VMTemplate: set Domain.CPU.Model
KubeVirtController->>NodePoolConditions: evaluate host-passthrough
NodePoolConditions-->>NodePoolAPI: set live-migratable condition false
Suggested reviewers: Merge Risk: 🟡 Moderate · up to When a CPU model is set without specifying cores for Guaranteed QoS, the generated VM may omit CPU requests and limits and lose Guaranteed QoS. This bounded correctness issue should be fixed or explicitly rejected before merge. 🚥 Pre-merge checks | ✅ 11✅ Passed checks (11 passed)
Full details: Stable And Deterministic Test NamesExplanation The pull request adds only standard Go Full details: Test Structure And QualityExplanation PASS: The pull request adds or updates only ordinary Go unit tests using Full details: Topology-Aware Scheduling CompatibilityExplanation PASS. The pull request adds a KubeVirt CPU model field and sets Full details: Ipv6 And Disconnected Network Test CompatibilityExplanation The pull request adds no Ginkgo e2e tests. The changed tests use standard Go Full details: No-Weak-CryptoExplanation PASS: The pull request adds CPU-model configuration and status handling only. The changed Go files add no MD5, SHA-1, DES, 3DES, RC4, Blowfish, or ECB usage, crypto packages, custom cryptography, or secret/token comparisons. The SHA-1 command found in aggregated documentation is unchanged from the parent revision. Full details: Container-PrivilegesExplanation PASS: The pull request adds a KubeVirt CPU model API field, CRD schema entries, and controller CPU configuration. The changed manifests contain only the new Full details: No-Sensitive-Data-In-LogsExplanation No sensitive-data logging was introduced. The production additions only translate and assign the CPU model and set a generic NodePool condition message. Searches of all added lines found no logger calls, formatted production output, passwords, tokens, API keys, PII, hostnames, or customer data. The new test diagnostics use synthetic values such as ✨ Finishing Touches🧪 Generate unit tests (beta)
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@orenc1: This pull request references Jira Issue OCPBUGS-55974, which is valid. The bug has been moved to the POST state. 3 validation(s) were run on this bug
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⚠️ Outside diff range comments (1)
hypershift-operator/controllers/nodepool/kubevirt/kubevirt.go (1)
146-171: Fix asymmetric CPU construction in non‑Guaranteed pathThe non-Guaranteed branch (line 211–213) unconditionally sets both
CoresandModelwhencpuModel != ""is true, even ifcoresremains 0. This differs from the Guaranteed branch (line 206–208), which only setsModel. WhenkvPlatform.Compute.Modelis provided withoutCores, the resultingCPU{Cores: 0, Model: cpuModel}is likely invalid; per the CLI documentation, vCPU cores must be ≥ 1 or left unset.Recommend conditionally populating CPU fields:
Proposed fix
} else { template.Spec.Template.Spec.Domain.Memory = &kubevirtv1.Memory{Guest: &memory} if cores > 0 || cpuModel != "" { - template.Spec.Template.Spec.Domain.CPU = &kubevirtv1.CPU{Cores: cores, Model: cpuModel} + cpu := &kubevirtv1.CPU{} + if cores > 0 { + cpu.Cores = cores + } + if cpuModel != "" { + cpu.Model = cpuModel + } + template.Spec.Template.Spec.Domain.CPU = cpu } }
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vendor/github.com/openshift/hypershift/api/hypershift/v1beta1/kubevirt.gois excluded by!vendor/**,!**/vendor/**vendor/github.com/openshift/hypershift/api/hypershift/v1beta1/zz_generated.deepcopy.gois excluded by!vendor/**,!**/vendor/**
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api/hypershift/v1beta1/kubevirt.goapi/hypershift/v1beta1/zz_generated.deepcopy.goapi/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/AAA_ungated.yamlapi/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/OpenStack.yamlcmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-CustomNoUpgrade.crd.yamlcmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-Default.crd.yamlcmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-TechPreviewNoUpgrade.crd.yamldocs/content/reference/api.mdhypershift-operator/controllers/nodepool/kubevirt/kubevirt.gohypershift-operator/controllers/nodepool/kubevirt/kubevirt_test.go
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Files:
api/hypershift/v1beta1/zz_generated.deepcopy.gocmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-Default.crd.yamlcmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-TechPreviewNoUpgrade.crd.yamlhypershift-operator/controllers/nodepool/kubevirt/kubevirt_test.goapi/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/OpenStack.yamlapi/hypershift/v1beta1/kubevirt.gohypershift-operator/controllers/nodepool/kubevirt/kubevirt.goapi/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/AAA_ungated.yamlcmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-CustomNoUpgrade.crd.yamldocs/content/reference/api.md
🧬 Code graph analysis (2)
api/hypershift/v1beta1/zz_generated.deepcopy.go (1)
api/hypershift/v1beta1/kubevirt.go (1)
CpuModelType(18-18)
hypershift-operator/controllers/nodepool/kubevirt/kubevirt_test.go (2)
api/hypershift/v1beta1/hostedcluster_types.go (1)
KubevirtPlatform(1223-1223)api/hypershift/v1beta1/kubevirt.go (4)
CpuModelHostPassthrough(22-22)CpuModelType(18-18)KubevirtNodePoolPlatform(165-211)KubevirtCompute(26-54)
🔇 Additional comments (10)
api/hypershift/v1beta1/zz_generated.deepcopy.go (1)
2443-2447: LGTM! Correct deep copy implementation for optional CPU model field.The auto-generated deep copy logic for the
Modelfield follows the standard pattern for pointer fields and is consistent with other optional fields in the same struct (Memory, Cores, QosClass).docs/content/reference/api.md (2)
5461-5480: CpuModelType docs match API intentThe enum and description correctly capture the new
host-passthroughCPU model behavior for KubeVirt VMs and are consistent with the PR’s semantics.
8801-8816: KubevirtCompute.model field is clearly and accurately documentedThe new
modelfield is well-described, correctly scoped to KubeVirt VM CPU model selection, and notes the live-migration compatibility trade-off; no further changes needed.cmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-TechPreviewNoUpgrade.crd.yaml (1)
1052-1091: CRD CPU model field wiring looks consistentThe new
kubevirt.compute.modelfield (string enumhost-passthrough) aligns withKubevirtCompute.Modeland theCpuModelTypeenum. Placement and description are consistent with the Go API.api/hypershift/v1beta1/kubevirt.go (1)
15-23: CPU model API surface is well‑shaped
CpuModelTypeplusCpuModelHostPassthroughand the optionalKubevirtCompute.Modelfield give a clear, type‑safe API and match the generated CRD schema.Also applies to: 48-53
cmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-Default.crd.yaml (1)
1052-1091: Default-set CRD CPU model matches API and TPNU schemaThe
kubevirt.compute.modelfield here mirrors the TechPreview CRD and the Go API (CpuModelType), so schema consistency across feature sets looks good.hypershift-operator/controllers/nodepool/kubevirt/kubevirt_test.go (1)
577-675: CPU model tests and helpers correctly exercise new behaviorThe added test cases cover both non‑Guaranteed and Guaranteed QoS flows with
host-passthrough, and the newcpuModel*helpers follow the existing option patterns, keeping expectations readable and aligned with the controller logic.Also applies to: 1387-1427
cmd/install/assets/hypershift-operator/zz_generated.crd-manifests/nodepools-CustomNoUpgrade.crd.yaml (1)
1073-1080: CPU model field wiring under KubeVirt compute looks correct
modelis correctly added as an optional string with thehost-passthroughenum underkubevirt.compute, and the description matches the documented behavior and trade-offs. This is structurally consistent with the rest of the CRD and safe from a compatibility perspective.api/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/AAA_ungated.yaml (1)
1070-1077: Schema is consistent with main CRD and feature‑gated variantThe
modelfield here mirrors the main NodePool CRD (location, type, enum, and description), keeping the ungated CRD in sync for KubeVirt CPU model configuration.api/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/OpenStack.yaml (1)
1070-1077: Uniform KubeVirt compute model support across OpenStack‑gated CRDThe
modelfield is correctly added underplatform.kubevirt.computewith the same constraints and description as other variants, maintaining a consistent API for KubeVirt node pools regardless of feature gate.
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host-passthrough model for VMs in NodePoolhost-passthrough model for VMs in NodePool
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| // CpuModelType represents the CPU model for KubeVirt VMs. | ||
| // | ||
| // +kubebuilder:validation:Enum=host-passthrough |
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In k8s we use PascalCase for enum values. This should be HostPassthrough
| QosClass *QoSClass `json:"qosClass,omitempty"` | ||
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| // model specifies the CPU model for the KubeVirt VirtualMachineInstance. | ||
| // When set to "host-passthrough", the VM will use the same CPU model as the node, |
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What happens when I don't set anything for this field?
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when the field is not set, no explicit CPU model is configured on the VirtualMachineInstance and kubevirt uses its default behavior. i've updated the godoc to clarify this:
// When not set, no explicit CPU model is configured and KubeVirt will use
// its default behavior.
| // which provides the best performance but may limit live migration compatibility. | ||
| // | ||
| // +optional | ||
| Model *CpuModelType `json:"model,omitempty"` |
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"" is not a valid user choice, so you don't actually need a pointer here
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thanks, fixed.
changed *CpuModelType to CpuModelType.
since the enum only allows HostPassthrough, the empty string zero value is sufficient to distinguish "not set" from "set"
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Actionable comments posted: 1
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Inline comments:
In `@hypershift-operator/controllers/nodepool/kubevirt/kubevirt.go`:
- Around line 226-228: Update the CPU construction logic around cpuModel and the
existing cores > 0 resource assignment so Guaranteed QoS with a CPU Model but
omitted Cores receives an effective core count of at least one, causing matching
CPU requests and limits to be populated. Add a template test covering Guaranteed
QoS with Model set and no Cores, or reject this combination through API
validation if that is the established contract.
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Fix all unresolved CodeRabbit comments on this PR:
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⛔ Files ignored due to path filters (9)
api/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/AAA_ungated.yamlis excluded by!**/zz_generated.featuregated-crd-manifests/**api/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/GCPPlatform.yamlis excluded by!**/zz_generated.featuregated-crd-manifests/**api/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/OSStreams.yamlis excluded by!**/zz_generated.featuregated-crd-manifests/**api/hypershift/v1beta1/zz_generated.featuregated-crd-manifests/nodepools.hypershift.openshift.io/OpenStack.yamlis excluded by!**/zz_generated.featuregated-crd-manifests/**cmd/install/assets/crds/hypershift-operator/zz_generated.crd-manifests/nodepools-CustomNoUpgrade.crd.yamlis excluded by!**/zz_generated.crd-manifests/**,!cmd/install/assets/**/*.yamlcmd/install/assets/crds/hypershift-operator/zz_generated.crd-manifests/nodepools-Default.crd.yamlis excluded by!**/zz_generated.crd-manifests/**,!cmd/install/assets/**/*.yamlcmd/install/assets/crds/hypershift-operator/zz_generated.crd-manifests/nodepools-TechPreviewNoUpgrade.crd.yamlis excluded by!**/zz_generated.crd-manifests/**,!cmd/install/assets/**/*.yamldocs/content/reference/api.mdis excluded by!docs/content/reference/api.mdvendor/github.com/openshift/hypershift/api/hypershift/v1beta1/kubevirt.gois excluded by!vendor/**,!**/vendor/**
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api/hypershift/v1beta1/kubevirt.goapi/hypershift/v1beta1/kubevirt_test.gohypershift-operator/controllers/nodepool/kubevirt/kubevirt.go
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@orenc1: This pull request references Jira Issue OCPBUGS-55974, which is valid. The bug has been moved to the POST state. 3 validation(s) were run on this bug
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| // +kubebuilder:default=Burstable | ||
| QosClass *QoSClass `json:"qosClass,omitempty"` | ||
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| // model specifies the CPU model for the KubeVirt VirtualMachineInstance. |
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I'd recommend adding an explicit list of valid values in here
| // model specifies the CPU model for the KubeVirt VirtualMachineInstance. | |
| // model specifies the CPU model for the KubeVirt VirtualMachineInstance. | |
| // Valid values are "HostPassthrough" and omitted. |
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makes sense, thanks.
i've added it.
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…ol VMs Allow customers to specify the CPU model for KubeVirt VMs via a new Model field on KubevirtCompute. Currently supports "host-passthrough", which exposes the host CPU model to the guest VM, enabling full MMIO space needed by large or multiple vGPUs. API Changes: - Added CpuModelType enum type with "host-passthrough" value - Added Model field to KubevirtCompute struct Controller Changes: - Thread the CPU model through to the VirtualMachineInstance template for both Burstable and Guaranteed QoS paths - Set KubeVirtNodesLiveMigratable condition to False when host-passthrough is configured, warning users about the live migration limitation - Guard against setting Cores to zero in the CPU struct when only model is specified Test Coverage: - Serialization compatibility test for KubevirtCompute (N-1/N+1) - CPU model with Burstable QoS - CPU model with Guaranteed QoS - CPU model without explicit cores - CPU model combined with host devices (vGPU use case) Signed-off-by: Oren Cohen <ocohen@redhat.com> Assisted-by: Claude <noreply@anthropic.com>
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/approve for the API change |
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Scheduling tests matching the |
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/approve |
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[APPROVALNOTIFIER] This PR is NOT APPROVED This pull-request has been approved by: JoelSpeed, nunnatsa, orenc1 The full list of commands accepted by this bot can be found here. DetailsNeeds approval from an approver in each of these files:
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4 participants
Allow customers to specify the CPU model for KubeVirt VMs via a new Model field on
KubevirtCompute. Currently supportshost-passthrough, which exposes the host CPU model to the guest VM, enabling full MMIOspace needed by large or multiple vGPUs.
API Changes:
CpuModelTypeenum type withhost-passthroughvalueController Changes:
KubeVirtNodesLiveMigratablecondition to False whenhost-passthroughis configured, warning users about the live migration limitationTest Coverage:
What this PR does / why we need it:
Which issue(s) this PR fixes:
Fixes
Special notes for your reviewer:
Checklist:
Summary by CodeRabbit
New Features
host-passthroughoption, allowing VMs to use the host’s CPU model for improved performance.Documentation
Important
host-passthroughmay not support live migration.