<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">2018-02-26 17:49 GMT+01:00 Marco Lorenzo Crociani <span dir="ltr"><<a href="mailto:marcoc@prismatelecomtesting.com" target="_blank">marcoc@prismatelecomtesting.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
I can't access avx512* instruction set from virtual machines.<br></blockquote><div><br></div><div>Added some relevant people.</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I have made a one server compute cluster to test new hardware:<br>
<br>
oVirt 4.1.9<br>
CentOS 7<br>
Cluster CPU Type: Intel Skylake Family<br>
Compatibility Version: 4.1<br>
<br>
HOST:<br>
CPU Model Name:Intel(R) Xeon(R) Platinum 8180 CPU @ 2.50GHz<br>
Family: Family<br>
CPU Type: Intel Skylake Family<br>
<br>
Virtual Machine settings<br>
A) VM:<br>
Custom CPU Type: Use cluster default(Intel Skylake Family)<br>
General Tab shows: Guest CPU Type: Skylake-Client<br>
<br>
avx512: NO<br>
<br>
B) VM:<br>
Custom CPU Type: Skylake-Client<br>
General Tab shows: Guest CPU Type: Skylake-Client<br>
<br>
avx512: NO<br>
<br>
C) VM:<br>
Custom CPU Type: Use cluster default(Intel Skylake Family) [grey - cannot modify]<br>
Migration mode: Do not allow migration<br>
Pass-Through Host CPU<br>
General Tab shows: Guest CPU Type: Skylake-Client<br>
<br>
avx512: YES ( cat /proc/cpuinfo |grep avx512: avx512f avx512dq avx512cd avx512bw avx512vl )<br>
<br>
Using pass-through host cpu (disabling vm migration) is the only way to access avx512 in a VM, is it a bug or am I missing something?<br>
<br>
Regards,<span class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
Marco Crociani<br>
Prisma Telecom Testing S.r.l.<br>
via Petrocchi, 4 20127 MILANO ITALY<br>
Phone: <a href="tel:%2B39%2002%2026113507" value="+390226113507" target="_blank">+39 02 26113507</a><br>
Fax: <a href="tel:%2B39%2002%2026113597" value="+390226113597" target="_blank">+39 02 26113597</a><br>
e-mail: <a href="mailto:marcoc@prismatelecomtesting.com" target="_blank">marcoc@prismatelecomtesting.co<wbr>m</a><br>
web: <a href="http://www.prismatelecomtesting.com" rel="noreferrer" target="_blank">http://www.prismatelecomtestin<wbr>g.com</a><br>
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