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Description of problem:
libvirt should check if vcpu topology is right. If the wrong vcpu topology is given in xml , the wrong arguments also be passed to qemu-kvm.
vcpu number = sockets*cores*threads
Version-Release number of selected component (if applicable):
libvirt-0.10.2-9.el6.x86_64
How reproducible:
100%
Steps to Reproduce:
1.# virsh start rhel63
Domain rhel63 started
2.# virsh dumpxml rhel63
<domain type='kvm' id='104'>
.......
<vcpu placement='static'>4</vcpu>
......
<cpu>
<topology sockets='1' cores='4' threads='2'/>
</cpu>
3.# ps -ef|grep qemu-kvm
qemu 21296 1 14 16:41 ? 00:00:17 /usr/libexec/qemu-kvm -name rhel63 -S -M rhel6.4.0 -enable-kvm -m 1024 -smp 4,sockets=1,cores=4,threads=2
......
4 Login guest
# lscpu
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 1
Core(s) per socket: 4
CPU socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: 6
Model: 13
Stepping: 3
CPU MHz: 3092.974
BogoMIPS: 6185.94
Hypervisor vendor: KVM
Virtualization type: full
L1d cache: 32K
L1i cache: 32K
L2 cache: 4096K
NUMA node0 CPU(s): 0-3
Actual results:
Wrong vcpu topology can be given in xml and passed to qemu-kvm
Expected results:
libvirt should check if vcpu topology is right.
Additional info:
Actually, QEMU can calculate from the values in smp, sockets, cores, threads to emulate how many physical processor, how many cores does each of physical processors contain and how many multi-threading logical processors does each core supports.
The algorithm was explain in my email
https://www.redhat.com/archives/libvir-list/2013-May/thread.html
The results can be verified by using cpuid tool
So I don't think this is a bug. If anything wrong during testing, please reopen this bug again.
Description of problem: libvirt should check if vcpu topology is right. If the wrong vcpu topology is given in xml , the wrong arguments also be passed to qemu-kvm. vcpu number = sockets*cores*threads Version-Release number of selected component (if applicable): libvirt-0.10.2-9.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1.# virsh start rhel63 Domain rhel63 started 2.# virsh dumpxml rhel63 <domain type='kvm' id='104'> ....... <vcpu placement='static'>4</vcpu> ...... <cpu> <topology sockets='1' cores='4' threads='2'/> </cpu> 3.# ps -ef|grep qemu-kvm qemu 21296 1 14 16:41 ? 00:00:17 /usr/libexec/qemu-kvm -name rhel63 -S -M rhel6.4.0 -enable-kvm -m 1024 -smp 4,sockets=1,cores=4,threads=2 ...... 4 Login guest # lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 4 CPU socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 13 Stepping: 3 CPU MHz: 3092.974 BogoMIPS: 6185.94 Hypervisor vendor: KVM Virtualization type: full L1d cache: 32K L1i cache: 32K L2 cache: 4096K NUMA node0 CPU(s): 0-3 Actual results: Wrong vcpu topology can be given in xml and passed to qemu-kvm Expected results: libvirt should check if vcpu topology is right. Additional info: