RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1626871 - [RFE] request for using TscInvariant feature with qemu-kvm.
Summary: [RFE] request for using TscInvariant feature with qemu-kvm.
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.4
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: 7.7
Assignee: Eduardo Habkost
QA Contact: Yumei Huang
URL:
Whiteboard:
Depends On:
Blocks: 651787
TreeView+ depends on / blocked
 
Reported: 2018-09-10 00:36 UTC by doun baek
Modified: 2023-09-07 19:22 UTC (History)
12 users (show)

Fixed In Version: qemu-kvm-1.5.3-169.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-03-31 20:02:00 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:1116 0 None None None 2020-03-31 20:03:29 UTC

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
Note You need to log in before you can comment on or make changes to this bug.