Bug 1739443

Summary: lscpu reports wrong hypervisor in nested virt on s390x
Product: Red Hat Enterprise Linux 8 Reporter: Dan Horák <dhorak>
Component: util-linuxAssignee: Karel Zak <kzak>
Status: CLOSED ERRATA QA Contact: Radka Brychtova <rskvaril>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 8.0   
Target Milestone: rc   
Target Release: 8.2   
Hardware: s390x   
OS: Unspecified   
Whiteboard:
Fixed In Version: util-linux-2.32.1-18.el8 Doc Type: If docs needed, set a value
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Clone Of: Environment:
Last Closed: 2020-04-28 17:03:07 UTC Type: Bug
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
/proc + /sys dump none

Description Dan Horák 2019-08-09 10:27:46 UTC 
Created attachment 1602074 [details]
/proc + /sys dump

Description of problem:
lscpu incorrectly reports z/VM as hypervisor while it should report KVM. It's for HW -> z/VM guest -> KVM guest nested virt scenario.

Version-Release number of selected component (if applicable):
util-linux-2.32.1-8.el8.s390x

How reproducible:
100%

Steps to Reproduce:
1. install KVM guest on top of a z/VM guest
2. lspcu in KVM guest

Actual results:
Architecture:        s390x
CPU op-mode(s):      32-bit, 64-bit
Byte Order:          Big Endian
CPU(s):              2
On-line CPU(s) list: 0,1
Thread(s) per core:  1
Core(s) per socket:  1
Socket(s) per book:  1
Book(s) per drawer:  1
Drawer(s):           2
NUMA node(s):        1
Vendor ID:           IBM/S390
Machine type:        2964
CPU dynamic MHz:     5000
CPU static MHz:      5000
BogoMIPS:            3033.00
Hypervisor:          z/VM 6.4.0
Hypervisor vendor:   IBM
Virtualization type: full
Dispatching mode:    horizontal


Expected results:
Architecture:                    s390x
CPU op-mode(s):                  32-bit, 64-bit
Byte Order:                      Big Endian
CPU(s):                          2
On-line CPU(s) list:             0,1
Thread(s) per core:              1
Core(s) per socket:              1
Socket(s) per book:              1
Book(s) per drawer:              1
Drawer(s):                       2
NUMA node(s):                    1
Vendor ID:                       IBM/S390
Machine type:                    2964
CPU dynamic MHz:                 5000
CPU static MHz:                  5000
BogoMIPS:                        3033.00
Hypervisor:                      KVM/Linux
Hypervisor vendor:               KVM


Additional info:
fixed in upstream with https://github.com/karelzak/util-linux/commit/350f5c8df2cb6edbfb5bae95f00a9fff446d236c
Comment 5 errata-xmlrpc 2020-04-28 17:03:07 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/RHBA-2020:1908