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Fix dedicated pending resources #307

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merged 3 commits into from
Apr 28, 2022

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ljelinkova
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During the migration of a VM group with mixed exclusive and manual pinnings, some pCPUs might have ended up to be pinned to both, manual and exclusive vCPUs at once. This was caused by the fact that the pending vds cpu unit resources have not been applied for non exclusively pinned CPUs and that the application of the pending resources has not been correct (the current VM's cpu pinning policy was used instead of the pending one).

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Thanks for catching it Lucia. The pending resources should have been taken more carefully.

When there is no host found where the VM can run,
the following message is displayed:

The host ABC did not satisfy internal filter CpuPinning because...

It makes sense to continue with "it" after that.

Also, in case of manual and resize and pin pinning, we should
mention also the possibility that some cores have been exclusively pinned.
…pinnings

In CpuPinningPolicyUnit, we need to apply the pending vds cpu resources
also for manual and resize and pin policies. Otherwise we may
end up with both, manual (or resize and pin) and dedicated vCPU
pinned to a single pCPU.
In VdsCpuUnitPinningHelper::previewPinOfPendingExclusiveCpus,
the CPU topology has been updated with an incorrect
CPU pinning policy (the current VM's instead of the pending one).

This may have caused that after the migration of a VM group
with mixed exclusive and manual pinnings, some CPUs might
end up to be pinned to both, manual and exclusive CPUs at once.
@ljelinkova ljelinkova force-pushed the fix-dedicated-pending-resources branch from 3640d84 to f5835a0 Compare April 27, 2022 15:26
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@ahadas ahadas merged commit 6e6ea81 into oVirt:master Apr 28, 2022
@ljelinkova ljelinkova deleted the fix-dedicated-pending-resources branch May 17, 2022 11:33
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3 participants