[ovirt-users] ovirt 4.1 - skylake - no avx512 support in virtual machines

[Sandro Bonazzola]

2018-02-26 17:49 GMT+01:00 Marco Lorenzo Crociani <
marcoc at prismatelecomtesting.com>:

> Hi,
> I can't access avx512* instruction set from virtual machines.
>

Added some relevant people.



> I have made a one server compute cluster to test new hardware:
>
> oVirt 4.1.9
> CentOS 7
> Cluster CPU Type: Intel Skylake Family
> Compatibility Version: 4.1
>
> HOST:
> CPU Model Name:Intel(R) Xeon(R) Platinum 8180 CPU @ 2.50GHz
> Family: Family
> CPU Type: Intel Skylake Family
>
> Virtual Machine settings
> A) VM:
> Custom CPU Type: Use cluster default(Intel Skylake Family)
> General Tab shows: Guest CPU Type: Skylake-Client
>
> avx512: NO
>
> B) VM:
> Custom CPU Type: Skylake-Client
> General Tab shows: Guest CPU Type: Skylake-Client
>
> avx512: NO
>
> C) VM:
> Custom CPU Type: Use cluster default(Intel Skylake Family) [grey - cannot
> modify]
> Migration mode: Do not allow migration
> Pass-Through Host CPU
> General Tab shows: Guest CPU Type: Skylake-Client
>
> avx512: YES   ( cat /proc/cpuinfo  |grep avx512: avx512f avx512dq avx512cd
> avx512bw avx512vl )
>
> 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?
>
> Regards,
>
> --
> Marco Crociani
> Prisma Telecom Testing S.r.l.
> via Petrocchi, 4  20127 MILANO  ITALY
> Phone:  +39 02 26113507
> Fax:  +39 02 26113597
> e-mail:  marcoc at prismatelecomtesting.com
> web:  http://www.prismatelecomtesting.com
> _______________________________________________
> Users mailing list
> Users at ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>



-- 

SANDRO BONAZZOLA

ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D

Red Hat EMEA <https://www.redhat.com/>
<https://red.ht/sig>
TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>
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