Bug 1292678

Summary: Qemu should report error when cmdline set threads=2 in amd host
Product: Red Hat Enterprise Linux 6 Reporter: Yumei Huang <yuhuang>
Component: qemu-kvmAssignee: Wei Huang (AMD) <wehuang>
Status: CLOSED ERRATA QA Contact: Virtualization Bugs <virt-bugs>
Severity: low Docs Contact:
Priority: high    
Version: 6.8CC: ailan, chayang, ehabkost, hhuang, jen, juzhang, michen, mkenneth, mrezanin, qzhang, rbalakri, salmy, sherold, virt-maint, wehuang, wei, xfu, yiwei, zhguo
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: qemu-kvm-0.12.1.2-2.495.el6 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-03-21 09:35:46 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1359965    

Description Yumei Huang 2015-12-18 03:09:17 UTC 
Description of problem:
In amd host, when qemu cmdline set threads=2, qemu should report " AMD CPU doesn't support hyperthreading", just like rhel7.2. 

Version-Release number of selected component (if applicable):
kernel: 2.6.32-593.el6.x86_64
qemu: qemu-kvm-0.12.1.2-2.481.el6

How reproducible:
always

Steps to Reproduce:
1.  start a qemu process with threads=2
  /usr/libexec/qemu-kvm -name win10 -m 6G -smp 2,threads=2,cores=1,sockets=1 -numa node -numa node  -monitor stdio

2. 
3.

Actual results:
Qemu report nothing.


Expected results:
Qemu should report error, just like rhel7.2:
qemu-kvm: AMD CPU doesn't support hyperthreading. Please configure -smp options properly.

Additional info:
Comment 2 Wei Huang (AMD) 2015-12-21 16:04:49 UTC 
See https://bugzilla.redhat.com/show_bug.cgi?id=1135772.

I will get a patch for 6.8. Please assign it to me.

-Wei
Comment 3 Jeff Nelson 2016-01-18 21:51:47 UTC 
Fix included in qemu-kvm-0.12.1.2-2.484.el6
Comment 5 Guo, Zhiyi 2016-01-20 05:31:39 UTC 
Test on qemu-kvm version:qemu-kvm-0.12.1.2-2.482.el6.x86_64
No warning output after lunch qemu-kvm:
# /usr/libexec/qemu-kvm -name win10 -m 6G -smp 2,threads=2,cores=1,sockets=1
VNC server running on `::1:5900'
Verified on qemu-kvm version:qemu-img-0.12.1.2-2.484.el6.x86_64:
Warning output after lunch qemu-kvm:
# /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.
Comment 14 Yash Mankad 2016-10-27 20:32:41 UTC 
Fix included in qemu-kvm-0.12.1.2-2.495.el6
Comment 16 Yiqian Wei 2016-10-28 09:19:42 UTC 
Reproduce:
host version:
  kernel-2.6.32-642.el6.x86_64
  qemu-kvm-0.12.1.2-2.494.el6.x86_64
Steps to Reproduce:
1.start a qemu process with threads=2 
# /usr/libexec/qemu-kvm -name win10 -m 6G -smp 2,threads=2,cores=1,sockets=1
VNC server running on `::1:5900'

Actual results:
Qemu report nothing.

------------------------------------

Verify this bug on "qemu-kvm-0.12.1.2-2.495.el6.x86_64" as same steps above.

Test results:Qemu report error
# /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.

According to result above,this bug has been fixed.
Comment 19 errata-xmlrpc 2017-03-21 09:35:46 UTC 
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