Rob Bradford 4b64f2a027 vmm: cpu: Reuse already allocated vCPUs if available ... When a request is made to increase the number of vCPUs in the VM attempt to reuse any previously removed (and hence inactive) vCPUs before creating new ones. This ensures that the APIC ID is not reused for a different KVM vCPU (which is not allowed) and that the APIC IDs are also sequential. The two key changes to support this are: * Clearing the "kill" bit on the old vCPU state so that it does not immediately exit upon thread recreation. * Using the length of the vcpus vector (the number of allocated vcpus) rather than the number of active vCPUs (.present_vcpus()) to determine how many should be created. This change also introduced some new info!() debugging on the vCPU creation/removal path to aid further development in the future. TEST=Expanded test_cpu_hotplug test. Fixes: #1338 Signed-off-by: Rob Bradford <robert.bradford@intel.com>		2020-06-23 14:11:14 +01:00
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integration.rs	vmm: cpu: Reuse already allocated vCPUs if available	2020-06-23 14:11:14 +01:00