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[Qemu-discuss] Not able to emulate host processor (2Sockets, 8Core/Socke

From: [J]
Subject: [Qemu-discuss] Not able to emulate host processor (2Sockets, 8Core/Socket, 2NUMA nodes) using host pass through
Date: Thu, 27 Nov 2014 05:12:36 +0800

Hi, All,

I'm using qemu-system-x86_64 in stable-2.1 and trying to use cpu pass-through (-cpu host) to emulate my host processor architecture, which is Intel Xeon CPU E5-2670 2.6GHz, 16 cores (2Sockets, 8Cores/Socket, 2Numa nodes).
But it seems that the virtual machine is stuck at somewhere, can not be launched.

The command I used to launch virtual machine is as follows.
/usr/local/qemu-2.1/bin/qemu-system-x86_64 -enable-kvm -boot c -cpu host -smp 16,sockets=2,cores=8,threads=1 -numa node,cpus=0-7 -numa node,cpus=8-15 -m 24576 -hda /var/lib/libvirt/images/test1.img -net nic,macaddr=52-54-00-12-34-4,model=virtio -net tap,ifname=tap0,script=no -device pci-assign,host=02:01.0,id=hostdev0

However, if I use "-cpu SandyBridge" the virtual machine can be launched, but L3 cache size is is missing in VM. I tried qemu-1.7 earlier, it's also same issue.

Is there any idea on how to fix it? Any help would be appreciated!

The "lscpu" output of host cpu is as follows:
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                16
On-line CPU(s) list:   0-15
Thread(s) per core:    1
Core(s) per socket:    8
CPU socket(s):         2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 45
Stepping:              7
CPU MHz:               2600.038
BogoMIPS:              5199.26
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              20480K
NUMA node0 CPU(s):     0-7
NUMA node1 CPU(s):     8-15


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