Bug 1450396 – Add support for AMD EPYC processors

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Bug 1450396 - Add support for AMD EPYC processors

Summary:	Add support for AMD EPYC processors

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	qemu-kvm (Show other bugs)
Sub Component:
Version:	7.4
Hardware:	Unspecified Unspecified

Priority	high Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Eduardo Habkost
QA Contact:	Guo, Zhiyi
Docs Contact:

URL:
Whiteboard:
Keywords:	FutureFeature

Depends On:	1445834 1481252 1524824
Blocks:
	Show dependency tree / graph

Reported:	2017-05-12 08:29 EDT by Paolo Bonzini
Modified:	2018-04-10 10:32 EDT (History)
CC List:	16 users (show)

See Also:
Fixed In Version:	qemu-kvm-1.5.3-146.el7
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:	1445834
Environment:
Last Closed:	2018-04-10 10:32:19 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:0816	normal	SHIPPED_LIVE	Low: qemu-kvm security, bug fix, and enhancement update	2018-04-10 08:47:03 EDT

Groups: None (edit)

Comment 1 Eduardo Habkost 2017-10-05 17:15:00 EDT

Upstream commit:

commit 2e2efc7dbe2b0adc1200b5aa286cdbed729f6751
Author: Brijesh Singh <brijesh.singh@amd.com>
Date:   Tue Aug 15 12:00:51 2017 -0500

    target-i386/cpu: Add new EPYC CPU model
    
    Add a new base CPU model called 'EPYC' to model processors from AMD EPYC
    family (which includes EPYC 76xx,75xx,74xx, 73xx and 72xx).
    
    The following features bits have been added/removed compare to Opteron_G5
    
    Added: monitor, movbe, rdrand, mmxext, ffxsr, rdtscp, cr8legacy, osvw,
           fsgsbase, bmi1, avx2, smep, bmi2, rdseed, adx, smap, clfshopt, sha
           xsaveopt, xsavec, xgetbv1, arat
    
    Removed: xop, fma4, tbm
    
    Cc: Paolo Bonzini <pbonzini@redhat.com>
    Cc: Richard Henderson <rth@twiddle.net>
    Cc: Eduardo Habkost <ehabkost@redhat.com>
    Cc: Tom Lendacky <Thomas.Lendacky@amd.com>
    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    Message-Id: <20170815170051.127257-1-brijesh.singh@amd.com>
    Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
    Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

Comment 2 Miroslav Rezanina 2017-10-24 00:40:28 EDT

Fix included in qemu-kvm-1.5.3-146.el7

Comment 6 Eduardo Habkost 2017-12-07 11:43:24 EST

The monitor/svm warnings and the lack of x2apic may be real issues, depending on the how the compat code on qemu-kvm-rhev works, thanks for catching it!  This happens because qemu-kvm-1.5.3 doesn't have a mechanism for automatically disabling/enabling features when in KVM mode.  I will work on a fix.

However, this doesn't prevent the CPU model from being used, so I suggest verifying this BZ and opening a new one that's not a FutureFeature BZ.

Comment 7 Guo, Zhiyi 2017-12-07 20:50:07 EST

Verified per comment 4, 6

Comment 11 errata-xmlrpc 2018-04-10 10:32:19 EDT

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://access.redhat.com/errata/RHSA-2018:0816

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