Bug 1626871

Summary:	[RFE] request for using TscInvariant feature with qemu-kvm.
Product:	Red Hat Enterprise Linux 7	Reporter:	doun baek <dbaek>
Component:	qemu-kvm	Assignee:	Eduardo Habkost <ehabkost>
Status:	CLOSED ERRATA	QA Contact:	Yumei Huang <yuhuang>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.4	CC:	ailan, areis, chayang, djdumas, ehabkost, jinzhao, juzhang, khuh, mrezanin, mtessun, ngu, zhguo
Target Milestone:	rc	Keywords:	FutureFeature
Target Release:	7.7
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-1.5.3-169.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-31 20:02:00 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:	651787

Description doun baek 2018-09-10 00:36:12 UTC

Description of problem:

the customer wants to use they TscInvariant CPU feature on VM.
but they can't use this feature due to they have to use RHEL without other products that has qemu-kvm-rhev.
also they can't understand why it can use after buying RHV or RHOSP.
so please check and confirm this feature can use on qemu-kvm.

Comment 25 Yumei Huang 2019-09-06 06:32:16 UTC

Verify:
qemu-kvm-1.5.3-169.el7
kernel-3.10.0-1085.el7.x86_64

QEMU cli:
# /usr/libexec/qemu-kvm -cpu 'Opteron_G5',+invtsc ...


Checked CPUID inside guest, TscInvariant is enabled. 

# cpuid
...
   Advanced Power Management Features (0x80000007/edx):
      TS: temperature sensing diode           = false
      FID: frequency ID control               = false
      VID: voltage ID control                 = false
      TTP: thermal trip                       = false
      TM: thermal monitor                     = false
      STC: software thermal control           = false
      100 MHz multiplier control              = false
      hardware P-State control                = false
      TscInvariant                            = true
      CPB: core performance boost             = false
      read-only effective frequency interface = false
      processor feedback interface            = false
      APM power reporting                     = false
      connected standby                       = false
      RAPL: running average power limit       = false
...


Savevm and migration is blocked as expected.

(qemu) savevm aa
State blocked by non-migratable device 'cpu'
(qemu) migrate -d tcp:0:1234
migrate: State blocked by non-migratable device 'cpu'

Comment 27 errata-xmlrpc 2020-03-31 20:02:00 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://access.redhat.com/errata/RHSA-2020:1116