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Bug 1445836 - Add support for AMD Ryzen processors
Summary: Add support for AMD Ryzen processors
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.4
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: 7.4
Assignee: Jiri Denemark
QA Contact: Luyao Huang
Depends On: 1445834 1481252 1524824
TreeView+ depends on / blocked
Reported: 2017-04-26 15:33 UTC by Paolo Bonzini
Modified: 2017-12-12 08:00 UTC (History)
14 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1445834
Last Closed: 2017-08-02 07:52:23 UTC
Target Upstream Version:

Attachments (Terms of Use)

Description Paolo Bonzini 2017-04-26 15:33:35 UTC
+++ This bug was initially created as a clone of Bug #1445834 +++

Based on LKML email, the processor has all the features in Opteron_G5 plus the following features:

cpu family	: 23
model		: 1
model name	: AMD Ryzen 7 1800X Eight-Core Processor
flags           :
mmxext fxsr_opt rdtscp movbe rdrand extapic cr8_legacy 3dnowprefetch fsgsbase 
bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1
xsaves clzero topoext

The "topoext" feature needs extra support in QEMU.

"bpext" and "mwaitx" may need KVM support too.

Comment 2 Paolo Bonzini 2017-04-26 15:55:20 UTC
host-model is broken on Ryzen.

Comment 3 Eduardo Habkost 2017-05-10 21:33:43 UTC
(In reply to Paolo Bonzini from comment #2)
> host-model is broken on Ryzen.

This is more serious than simply lacking the CPU model definition. Is there a BZ for that with more details?

Comment 4 Jiri Denemark 2017-05-11 07:40:15 UTC
They used quite old versions of libvirt and QEMU, which resulted in Opteron_G3 plus a bunch of features instead of the newest Opteron_G5 +/- features. And QEMU was so old it didn't automatically increase CPUID level based on the extra features.

Comment 12 Paolo Bonzini 2017-06-21 13:44:19 UTC
The set of disabled feature in the guest compared to Opteron_G5 is okay.  Thanks!

Comment 16 Luyao Huang 2017-06-26 06:52:35 UTC
Verify this bug with comment 8, comment 9 and comment 10.

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