![]() Just shutdown “UAKVM2” KVM guest to verify it. But this will change when you power cycle the VM. In KVM host, You might still see the two allocated vCPU’s to guest UAKVM2. ~]# tail -f /var/log/messagesĭec 16 13:01:01 UA-KVM1 systemd: Starting Session 2 of user root.ĭec 16 13:19:08 UA-KVM1 kernel: Unregister pv shared memory for cpu 1ĭec 16 13:19:08 UA-KVM1 kernel: smpboot: CPU 1 is now ~]# lscpu Login to the KVM guest “UAKVM2” and verify. ![]() (Reducing the vCPU to 1 from 2) ~]# virsh setvcpus -live -guest UAKVM2 ~]#Ĥ. Use the following command to reduce the vCPU count on UAKVM2. You might get error like ” error: internal error: cannot change vcpu count of this domain ” ~]# virsh setvcpus UAKVM2 1Įrror: internal error: cannot change vcpu count of this ~]# ![]() Do not use following command to remove the vCPU. Assuming that there are two active vCPU’s on KVM guest UAKVM2.ģ. But you can bring back the CPU core power to the KVM hosts by disabling the CPU core.Ģ. There is no direct method to remove the vCPU’s from the KVM guest. We have successfully added one vCPU to the KVM guest on fly and made it persistent. Save the VM configuration if you want to make this changes persistent. ~]# tail -f /var/log/messagesĭec 16 12:48:28 UA-KVM1 kernel: CPU1 has been hot-addedĭec 16 12:48:28 UA-KVM1 kernel: SMP alternatives: switching to SMP codeĭec 16 12:48:57 UA-KVM1 kernel: smpboot: Booting Node 0 Processor 1 APIC 0x1ĭec 16 12:48:57 UA-KVM1 kernel: kvm-clock: cpu 1, msr 0:3ff87041, secondary cpu clockĭec 16 12:48:57 UA-KVM1 kernel: TSC synchronization :ĭec 16 12:48:57 UA-KVM1 kernel: Measured 906183720569 cycles TSC warp between CPUs, turning off TSC clock.ĭec 16 12:48:57 UA-KVM1 kernel: tsc: Marking TSC unstable due to check_tsc_sync_source failedĭec 16 12:48:57 UA-KVM1 kernel: KVM setup async PF for cpu 1ĭec 16 12:48:57 UA-KVM1 kernel: kvm-stealtime: cpu 1, msr 3fd0d240ĭec 16 12:48:57 UA-KVM1 kernel: microcode: CPU1 sig=0x206c1, pf=0x1, revision=0x1ĭec 16 12:48:57 UA-KVM1 kernel: Will online and init hotplugged CPU: ~]# lscpuģ. VM will switch to “SMP code (symmetric multiprocessor)” from “UP code(uniprocessor)”. Go back to KVM guest and check the newly added vCPU. ~]# virsh setvcpus UAKVM2 ~]# virsh dominfo UAKVM2 Switch to the KVM host and increase the vCPU from 1 to 2 using virsh command. Let’s increase the vCPU count from 1 to 2.ġ. Model name: Westmere E56xx/L56xx/X56xx (Nehalem-C) Login to the KVM guest and check the allocated vCPU count. But you can’t increase the vCPU more than 2 on running VM.ģ. KVM Guest vCPU LimitsĪs per the above screenshot, this VM is privileged to use 1 vCPU and you can add one more vCPU using “virsh vsetcpus” command on fly. ~]# virsh list -allĢ.Check the current VM configuration. So while deploying the new virtual machines, you should always consider this parameter as prerequisite.There is no harm specifying the maximum vCPU’s to KVM guest since is going to use only the allocated vCPU (vcpu placement=’static’ current=’N’). But this works if you have configured the KVM guest with Maximum vCPUs parameter. Like KVM memory management, you can add/remove vCPU’s to active VM using “virsh” command. Next step i will do to understand more of this, I will leave uncorrected the guest time, but will perform several unraid box restarts, and see when it stops adding this extra hour nonsense.Does KVM support vCPU hot-plug ? Will Linux KVM guest can recognize the newly added vCPU’s ? The answer is “YES” off-course. I switch OFF, then ON the "Set time automatically" = > time is accurate for the session.īut then, any restart of unraid will change the time in the VM by adding extra hour. unraid time remains accurate after restart. I restart the Windows VM - time remains accurate In the guest, i have similar settings like: Then i enable NTP as Yes, time textbox gets grayed out and is accurate. Save => the time is again reduced by 1 hour, but it's accurate as per my current time. Then i change the unraid time to account for this strange behavior, by adding 1 hour. I set the time to the current time and save - immediately the time is updated to 1 hour less, by the unraid interface probably - some javascript maybe. Time zone: utc+2 athens, bucharest, istanbul In red what's wrong, in green what is expect behavior. I try to explain the steps i perform while setting up the time of unraid tower (settings>date and time).
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