Bug 1787556
| Summary: | virt-ssbd not included on CPU mode='host-model' [rhel-7.7.z] | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | RAD team bot copy to z-stream <autobot-eus-copy> |
| Component: | libvirt | Assignee: | Jiri Denemark <jdenemar> |
| Status: | CLOSED ERRATA | QA Contact: | jiyan <jiyan> |
| Severity: | high | Docs Contact: | |
| Priority: | urgent | ||
| Version: | 7.7 | CC: | afox, dyuan, ehabkost, jdenemar, jiyan, jortialc, jsuchane, lhuang, lmen, lmiksik, mkalinin, mvanderw, stanislav.moravec, xuzhang, yalzhang |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | libvirt-4.5.0-23.el7_7.5 | Doc Type: | Bug Fix |
| Doc Text: |
Cause: qemu-kvm 1.5.3 from RHEL 7 is too old to support probing for CPU features available on the host and thus libvirt does not know whether virt-ssbd feature can be emulated.
Consequence: Libvirt does not enable virt-ssbd feature for domains using host-model CPU even if the feature can be emulated on the host.
Fix: On AMD hosts libvirt will always try to enable virt-ssbd for domains with host-model CPU.
Result: Domains with host-model CPU will benefit from virt-ssbd if it can be emulated on the host.
|
Story Points: | --- |
| Clone Of: | 1745181 | Environment: | |
| Last Closed: | 2020-02-04 19:29:46 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: | 1745181 | ||
| Bug Blocks: | |||
|
Description
RAD team bot copy to z-stream
2020-01-03 11:46:45 UTC
Reproduced this bug with libvirt-4.5.0-23.el7_7.4.x86_64 and verified this bug with libvirt-4.5.0-23.el7_7.5.x86_64.
Version:
libvirt-4.5.0-23.el7_7.4.x86_64
qemu-kvm-1.5.3-167.el7_7.1.x86_64
kernel-3.10.0-1062.9.1.el7.x86_64
Steps:
# lscpu
...
Model name: AMD EPYC 7251 8-Core Processor
...
Flags: ... ssbd
# virsh domstate generic
shut off
# virsh dumpxml generic --inactive |grep "<cpu" -A2
<cpu mode='host-model' check='partial'>
<model fallback='allow'/>
</cpu>
# virsh start generic
Domain generic started
# virsh dumpxml generic |grep "<cpu" -A20
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>EPYC-IBPB</model>
<vendor>AMD</vendor>
<feature policy='disable' name='ht'/>
<feature policy='disable' name='osxsave'/>
<feature policy='require' name='cmp_legacy'/>
<feature policy='disable' name='extapic'/>
<feature policy='disable' name='skinit'/>
<feature policy='disable' name='wdt'/>
<feature policy='disable' name='tce'/>
<feature policy='disable' name='topoext'/>
<feature policy='disable' name='perfctr_core'/>
<feature policy='disable' name='perfctr_nb'/>
<feature policy='disable' name='monitor'/>
<feature policy='require' name='hypervisor'/>
<feature policy='disable' name='arat'/>
<feature policy='disable' name='svm'/>
</cpu>
# ps -ef |grep generic
...-cpu EPYC-IBPB,+ht,+osxsave,+cmp_legacy,+extapic,+skinit,+wdt,+tce,+topoext,+perfctr_core,+perfctr_nb -m 1024
# virsh console generic
Connected to domain generic
Escape character is ^]
Red Hat Enterprise Linux Server 7.7 (Maipo)
Kernel 3.10.0-1062.el7.x86_64 on an x86_64
localhost login: root
Password:
[root@localhost ~]# lscpu | grep ssbd
No output
# yum update libvirt* -y
# rpm -qa libvirt
libvirt-4.5.0-23.el7_7.5.x86_64
# system restart libvirtd
# virsh destroy generic; virsh start generic
Domain generic destroyed
Domain generic started
# virsh dumpxml generic |grep "<cpu" -A30
<cpu mode='custom' match='exact' check='full'>
<model fallback='forbid'>EPYC-IBPB</model>
<vendor>AMD</vendor>
<feature policy='disable' name='ht'/>
<feature policy='disable' name='osxsave'/>
<feature policy='require' name='cmp_legacy'/>
<feature policy='disable' name='extapic'/>
<feature policy='disable' name='skinit'/>
<feature policy='disable' name='wdt'/>
<feature policy='disable' name='tce'/>
<feature policy='disable' name='topoext'/>
<feature policy='disable' name='perfctr_core'/>
<feature policy='disable' name='perfctr_nb'/>
<feature policy='require' name='virt-ssbd'/> [**ssbd is here**]
<feature policy='disable' name='monitor'/>
<feature policy='require' name='hypervisor'/>
<feature policy='disable' name='arat'/>
<feature policy='disable' name='svm'/>
</cpu>
# ps -ef |grep generic
...-cpu EPYC-IBPB,+ht,+osxsave,+cmp_legacy,+extapic,+skinit,+wdt,+tce,+topoext,+perfctr_core,+perfctr_nb,+virt-ssbd **** -m 1024
# virsh console generic
Connected to domain generic
Escape character is ^]
Red Hat Enterprise Linux Server 7.7 (Maipo)
Kernel 3.10.0-1062.el7.x86_64 on an x86_64
localhost login: root
Password:
Last login: Tue Jan 14 11:45:19 on ttyS0
[root@localhost ~]# lscpu | grep ssbd
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm art rep_good nopl extd_apicid eagerfpu pni pclmulqdq ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand hypervisor lahf_lm cmp_legacy cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw retpoline_amd ssbd ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 virt_ssbd **** arat
All the test results are as expected, move this bug to be verified.
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-2020:0367 |