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Description of problem:
In Intel host, when qemu cmdline set threads=2, without -cpu specified, report
qemu-kvm: AMD CPU doesn't support hyperthreading. Please configure -smp options properly.
Version-Release number of selected component (if applicable):
2.6.32-633.el6.x86_64
qemu-kvm-0.12.1.2-2.490.el6.x86_64
How reproducible:
100%
Steps to Reproduce:
1.# /usr/libexec/qemu-kvm -name win10 -m 6G -smp 2,threads=2,cores=1,sockets=1
qemu-kvm: AMD CPU doesn't support hyperthreading. Please configure -smp options properly.
VNC server running on `::1:5900'
2.
3.
Actual results:
report error:
qemu-kvm: AMD CPU doesn't support hyperthreading. Please configure -smp options properly.
Expected results:
should not report this error
Additional info:
My machine:
model name : Intel(R) Core(TM) i7-3770 CPU @ 3.40GHz
just happens without -cpu specified, if -cpu type is AMD, report this error, -cpu type is Intel ,didn't report
retest qemu-kvm-0.12.1.2-2.483.el6.x86_64, no this issue,so this a Regression
Hi,Wei
Seems this bug because fixed Bug 1292678 - Qemu should report error when cmdline set threads=2 in amd host , Can you check it? and on rhel7.2 no this issue.
thanks
Wei
I can reproduce this bug on Intel box. However I think this isn't a bug from the instrumentation I did with QEMU 6.8. Here are the findings:
1) The problem was introduced by commit 50d095912. The related code is in
pc_new_cpu() of hw/pc.c file.
2) IS_INTEL_CPU(env) is TRUE, implying that QEMU believes guest is an AMD CPU.
3) I instrumented cpu_x86_register() of target-i386/cpuid.c file. When no -cpu
is specified, cpu_model name is "cpu64-rhel6". So by default qemu-kvm-6.8 uses
"cpu64-rhel6" as the CPU model when nothing is specified. According to
target-i386/cpuid.c, "cpu64-rhel6" is based on AMD CPU model.
From the data collected above, I think this warning msg is legit because AMD CPU doesn't support HyperThreading.
-Wei
(In reply to Wei Huang from comment #5)
> Is it a common usage case not to specify "-cpu"? I am trying to understand
> how annoying this warning message is.
Hi Wei,
I personally think it's no common scenario. However, 2 concerns.
1. Seems this is regression issue according to comment0
2. It's strange that the qemu-kvm promotes message like "AMD CPU doesn't support ..." but the qemu runs on Intel host.
Best Regards,
Junyi
Reproduce proceduce
Host version:
kernel-2.6.32-642.el6.x86_64
qemu-kvm-0.12.1.2-2.490.el6.x86_64
Steps to Reproduce:
1./usr/libexec/qemu-kvm -name win10 -m 6G -smp 2,threads=2,cores=1,sockets=1
qemu-kvm: AMD CPU doesn't support hyperthreading. Please configure -smp options properly.
VNC server running on `::1:5900'
Actual results:
report error:
qemu-kvm: AMD CPU doesn't support hyperthreading. Please configure -smp options properly.
-------------------------------------------
Verify this bug
Host version:
kernel-2.6.32-642.el6.x86_64
qemu-kvm-0.12.1.2-2.495.el6.x86_64
Test steps:
1./usr/libexec/qemu-kvm -name win10 -m 6G -smp 2,threads=2,cores=1,sockets=1
VNC server running on `::1:5900'
Test results:
not report this error.
Conclusion：
According to result above,this bug has been fixed.
Additional info:
My machine:
model name : Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHSA-2017-0621.html