Bug 1746281
| Summary: | qemu-kvm-rhev: backport cpuidle-haltpoll support [rhel-7.6.z] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | RAD team bot copy to z-stream <autobot-eus-copy> |
| Component: | qemu-kvm-rhev | Assignee: | Marcelo Tosatti <mtosatti> |
| Status: | CLOSED ERRATA | QA Contact: | Yumei Huang <yuhuang> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | high | ||
| Version: | 7.8 | CC: | chayang, hhuang, jinzhao, juzhang, mtessun, mtosatti, ppandit, virt-maint |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-rhev-2.12.0-18.el7_6.8 | Doc Type: | If docs needed, set a value |
| Doc Text: | Story Points: | --- | |
| Clone Of: | 1734502 | Environment: | |
| Last Closed: | 2020-03-05 15:04:52 UTC | Type: | --- |
| 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: | 1734502, 1759283 | ||
| Bug Blocks: | |||
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Description
RAD team bot copy to z-stream
2019-08-28 07:25:46 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.
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 |