vCPU Hot-unplug #4753
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vCPU Hot-unplug #4753
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## feature/vcpu-hotplug #4753 +/- ##
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- Coverage 81.95% 79.21% -2.74%
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Files 257 224 -33
Lines 31762 26485 -5277
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- Hits 26031 20981 -5050
+ Misses 5731 5504 -227
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Change from `add` to `target`. The user now supplies the number of vCPUs they would like to reach, rather than the number of vCPUs to add to the system. Obviously to make this work, hot-unplug functionality is needed as well. Examples: - Currently 1 vCPU, would like 16 vCPUs: target = 16 - Currently 32 vCPUs, would like 2 vCPUs: target = 2 Signed-off-by: James Curtis <jxcurtis@amazon.co.uk>
Guest side hot-unplug implementation. This means that the API call can be made, and the vCPUs are successfully removed from the guest, but the backing vCPU threads are not removed from the host VMM. As a result of this, hot-plugs that occur after hot-unplugs do not work correctly right now. Once the total thread count in the VMM exceeds 32, there is no effect of hot-plugging. To complete this, a refactor is needed of the VMM, such that the CpuContainer can somehow remove the threads when the guest kernel calls _EJ0. Signed-off-by: James Curtis <jxcurtis@amazon.co.uk>
ghost
Update metrics and swagger to reflect the changes made to the API. Signed-off-by: James Curtis <jxcurtis@amazon.co.uk>
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Changes
/hotplugendpoint, now the user requests a target number of vCPUs to be reached.Unfinished
CpuContainerthe ability to terminate threads.Reason
To provide the inverse of hot-plugging, so that VMs can be scaled in both directions.
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CONTRIBUTING.md.PR Checklist
PR.
CHANGELOG.md.TODOs link to an issue.contribution quality standards.
rust-vmm.