Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 1787291

Summary:	RHVH 4.4: Failed to run VM on 4.3/4.4 engine (Exit message: the CPU is incompatible with host CPU: Host CPU does not provide required features: hle, rtm) [rhel-8.1.0.z]
Product:	Red Hat Enterprise Linux Advanced Virtualization	Reporter:	RHEL Program Management Team <pgm-rhel-tools>
Component:	qemu-kvm	Assignee:	Eduardo Habkost <ehabkost>
qemu-kvm sub component:	General	QA Contact:	Yumei Huang <yuhuang>
Status:	CLOSED NEXTRELEASE	Docs Contact:
Severity:	urgent
Priority:	urgent	CC:	areis, chayang, cshao, ddepaula, ehabkost, ehadley, jdenemar, jinzhao, jreznik, jsuchane, juzhang, knoel, lsvaty, mavital, michal.skrivanek, mrezanin, mtessun, ncredi, nlevy, peyu, qiyuan, sbonazzo, sgott, shlei, toneata, virt-maint, weiwang, yaniwang, ycui, ymankad, yturgema, yuhuang
Version:	8.1	Keywords:	Triaged, ZStream
Target Milestone:	rc	Flags:	pm-rhel: mirror+
Target Release:	8.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	qemu-kvm-4.1.0-14.module+el8.1.0+5744+32d46cdb.3	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1779078	Environment:
Last Closed:	2020-12-11 16:25:49 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:	1779078, 1788122
Bug Blocks:

Comment 2 Ademar Reis 2020-02-05 23:11:42 UTC

QEMU has been recently split into sub-components and as a one-time operation to avoid breakage of tools, we are setting the QEMU sub-component of this BZ to "General". Please review and change the sub-component if necessary the next time you review this BZ. Thanks

Comment 3 Danilo de Paula 2020-02-11 13:58:56 UTC

Cab you grant release+ for this BZ? Looks like it's missing from the automation.

Comment 4 Yash Mankad 2020-02-13 18:20:28 UTC

Hi Danilo,

I don't seem to have permission to grant release+ and this BZ has all other flags set.
So this seems like an automation bug that I need to follow up on.

@Martin, could you grant release+ for this ?

Thanks

Comment 11 Yumei Huang 2020-02-26 03:28:01 UTC

Reproduce:
qemu-kvm-4.1.0-14.module+el8.1.0+4754+8d38b36b
libvirt-client-5.6.0-6.2.module+el8.1.0+4953+432c8346.x86_64
kernel-4.18.0-147.7.1.el8_1.x86_64

Host: dell-per730-39.lab.eng.pek2.redhat.com (Intel(R) Xeon(R) CPU E5-2630 v3 @ 2.40GHz)

Haswell is usable in `virsh domcapabilities` while host doesn't support hle and rtm.

# virsh domcapabilities 
  <cpu>
    <mode name='host-passthrough' supported='yes'/>
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Haswell-noTSX-IBRS</model>
      <vendor>Intel</vendor>
    ...
    <mode name='custom' supported='yes'>
    ...
      <model usable='yes'>Haswell-noTSX-IBRS</model>
      <model usable='yes'>Haswell-noTSX</model>
      <model usable='no'>Haswell-IBRS</model>
      <model usable='yes'>Haswell</model>               ---> Haswell is usable
    ...
    </mode>
  </cpu>


# /usr/libexec/qemu-kvm -cpu Haswell
qemu-kvm: warning: host doesn't support requested feature: CPUID.07H:EBX.hle [bit 4]
qemu-kvm: warning: host doesn't support requested feature: CPUID.07H:EBX.rtm [bit 11]



Verify:
qemu-kvm-4.1.0-14.module+el8.1.0+5744+32d46cdb.3
libvirt-client-5.6.0-6.2.module+el8.1.0+4953+432c8346.x86_64
kernel-4.18.0-147.7.1.el8_1.x86_64

On same host, Haswell is not usable anymore.

# virsh domcapabilities 
...
  <cpu>
    <mode name='host-passthrough' supported='yes'/>
    <mode name='host-model' supported='yes'>
      <model fallback='forbid'>Haswell-noTSX-IBRS</model>
    ...
    <mode name='custom' supported='yes'>
      ...
      <model usable='yes'>Haswell-noTSX-IBRS</model>
      <model usable='yes'>Haswell-noTSX</model>
      <model usable='no'>Haswell-IBRS</model>
      <model usable='no'>Haswell</model>                 ----> Haswell is not usable.
      ...
    </mode>
  </cpu>