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<fix>[header]: add VM migrate host-constraint extension point #4062

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<fix>[header]: add VM migrate host-constraint extension point #4062

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23 changes: 23 additions & 0 deletions header/src/main/java/org/zstack/header/vm/VmMigrateHostConstraintExtensionPoint.java
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Original file line number Diff line number Diff line change
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package org.zstack.header.vm;

import java.util.List;

/**
* Reports VMs that are pinned to their current host and cannot be
* live-migrated because of attached passthrough devices, such as physical
* PCI passthrough devices, dGPU and mediated (mdev) devices.
*
* It is queried by DRS scheduling so that automatic load balancing skips
* such VMs instead of generating migration tasks that are bound to fail.
*
* VF / vDPA NIC devices do NOT pin a VM to its host (they have dedicated
* migration support) and therefore must NOT be reported here.
*/
public interface VmMigrateHostConstraintExtensionPoint {
/**
* @param candidateVmUuids VM uuids being considered for migration
* @return the subset of candidateVmUuids that cannot be migrated off
* their current host because of attached passthrough devices
*/
List<String> getHostBoundVmUuids(List<String> candidateVmUuids);
}