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Bug 1746281 - qemu-kvm-rhev: backport cpuidle-haltpoll support [rhel-7.6.z]
Summary: qemu-kvm-rhev: backport cpuidle-haltpoll support [rhel-7.6.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm-rhev
Version: 7.8
Hardware: Unspecified
OS: Unspecified
high
unspecified
Target Milestone: rc
: ---
Assignee: Marcelo Tosatti
QA Contact: Yumei Huang
URL:
Whiteboard:
Depends On: 1734502 1759283
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-08-28 07:25 UTC by RAD team bot copy to z-stream
Modified: 2022-07-09 11:06 UTC (History)
8 users (show)

Fixed In Version: qemu-kvm-rhev-2.12.0-18.el7_6.8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1734502
Environment:
Last Closed: 2020-03-05 15:04:52 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:0730 0 None None None 2020-03-05 15:05:33 UTC

Description RAD team bot copy to z-stream 2019-08-28 07:25:46 UTC 
This bug has been copied from bug #1734502 and has been proposed to be backported to 7.6 z-stream (EUS).
Comment 5 Yumei Huang 2020-02-13 09:29:32 UTC 
Verify:
qemu-kvm-rhev-2.12.0-18.el7_6.8
kernel-3.10.0-957.46.1.el7.x86_64 (both guest and host)

Steps:

1) Enable tracing on both src and dst host

# cd /sys/kernel/debug/tracing
# echo "kvm_msr" > set_event
# echo "ecx==0x4b564d05" > events/kvm/kvm_msr/filter
# echo > trace


2) Boot guest with "-cpu Haswell-noTSX,+kvm-poll-control" on src host


3) Load cpuidle-haltpoll driver inside guest

# modprobe cpuidle-haltpoll


4) Run "rdmsr 0x4b564d05" inside guest, cat trace on src host

# rdmsr 0x4b564d05
0

# cat trace
...
           <...>-65637 [004] .... 91836.781567: kvm_msr: msr_write 4b564d05 = 0x0
           <...>-65613 [015] .... 91843.430754: kvm_msr: msr_read 4b564d05 = 0x0


5) Migrate guest to dst host


6) Run "rdmsr 0x4b564d05" inside guest, cat trace on dst host

# rdmsr 0x4b564d05
0

# cat trace
...
        qemu-kvm-16538 [003] ....  8611.418674: kvm_msr: msr_read 4b564d05 = 0x0




Repeat above steps without loading cpuidle-haltpoll driver, rdmsr 0x4b564d05 returns 1 inside guest before and after migration.
Comment 7 errata-xmlrpc 2020-03-05 15:04:52 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-2020:0730
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