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[Qemu-devel] [Bug 1195170] Re: cpu hot-add doesn't work with upstream qe
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [Bug 1195170] Re: cpu hot-add doesn't work with upstream qemu 1.5.50 |
Date: |
Thu, 27 Jun 2013 07:49:26 -0000 |
You need to specify "-smp maxcpus=N" on the command-line, for example
"-smp cpus=2,maxcpus=4" will start the VM with 2 CPUs and let you add 2
more. Also, the argument to cpu-add is zero-based, so the range is
0..(maxcpus-1).
** Changed in: qemu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1195170
Title:
cpu hot-add doesn't work with upstream qemu 1.5.50
Status in QEMU:
Invalid
Bug description:
cpu hot-add doesn't work with upstream qemu 1.5.50. When we add the
cpu [through QMP] it throws error as " {"error": {"class":
"GenericError", "desc": "Unable to add CPU: 2, max allowed: 1"}} ",
when we have booted the guest with two cpus.
Host Kernel Version: 3.10.0-rc5+
Libvirt Version: 1.0.6
Qemu Version: 1.5.50
Guest Kernel : 2.6.32-358.6.1.el6.x86_64
Steps to Reproduce :
Boot the guest with : qemu-system-x86_64 -drive
file='/home/images/vm1.qcow2',format=qcow2,cache=none,boot=on -m 2048
-smp 2,cores=2,threads=1,sockets=1 -qmp tcp:localhost:4444,server
-monitor stdio -enable-kvm
Start the telnet localhost 4444 on another shell
verify that there are two cpus :
I verified through HMP
(qemu) info cpus
* CPU #0: pc=0x000000000000f081 thread_id=2034
CPU #1: pc=0x00000000000f6497 (halted) thread_id=2031
Hot add the CPU using the below command in QMP:
{ "execute": "cpu-add", "arguments": { "id": 2 } }
{"error": {"class": "GenericError", "desc": "Unable to add CPU: 2, max
allowed: 1"}}
Notes:
--------
1. By default [without specifying the no of cpu], the guest boots up with 1
cpu, when we try to add one more cpu, below is the error:
{ "execute": "cpu-add", "arguments": { "id": 1 } }
{"error": {"class": "GenericError", "desc": "Unable to add CPU: 1, max
allowed: 0"}}
2. This issue is seen with or without enabling the KVM [i.e booting
the guest without -enable-kvm option]
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