Bug 1937564

Summary:	[RFE] support VCPU hot unplug in OVMF/edk2
Product:	Red Hat Enterprise Linux 8	Reporter:	Ademar Reis <areis>
Component:	edk2	Assignee:	Laszlo Ersek <lersek>
Status:	CLOSED ERRATA	QA Contact:	Yumei Huang <yuhuang>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	---	CC:	berrange, chayang, coli, jinzhao, juzhang, kraxel, lersek, mrezanin, pbonzini, philmd, virt-maint, xuwei, yfu, yuhuang
Target Milestone:	pre-dev-freeze	Keywords:	FutureFeature, Triaged
Target Release:	---	Flags:	pm-rhel: mirror+
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	edk2-20210527gite1999b264f1f-1.el8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-11-09 18:06:53 UTC	Type:	Feature Request
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:	edk2-stable202105
Embargoed:
Bug Depends On:	1938238
Bug Blocks:	1849172

Description Ademar Reis 2021-03-11 01:25:15 UTC

Hot-unplug is usually tracked, implemented and tested as a separate feature, due to the additional complexity.

This bug was initially created as a copy of Bug #1454803

OVMF (built from upstream edk2 @ f78c8bf2c64f ("OvmfPkg/README: document 4MB flash layout", 2017-05-06)), using the SMM stack, does not implement VCPU hotplug / hot-unplug.

Investigate & implement the feature.

It will almost certainly require upstream QEMU development too.

Comment 2 Laszlo Ersek 2021-03-16 14:09:33 UTC

The upstream v9 series:

* [edk2-devel] [PATCH v9 00/10] support CPU hot-unplug
msgid: <20210312062656.2477515-1-ankur.a.arora>
https://edk2.groups.io/g/devel/message/72702
https://listman.redhat.com/archives/edk2-devel-archive/2021-March/msg00449.html

has been merged as commit range 4751a48aeb2a..f3bdfc41866e, via <https://github.com/tianocore/edk2/pull/1494>.

Comment 3 Yumei Huang 2021-05-13 03:30:54 UTC

Hi Laszlo, 

Would you please set DTM? The qemu bug 1849172 is ON_QA, QE would like to know when the edk2 package is ready to test. Thanks!

Comment 10 Yanan Fu 2021-06-24 03:40:12 UTC

QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass.

Comment 13 Yumei Huang 2021-06-30 02:04:53 UTC

Verify:
qemu-kvm-6.0.0-21.module+el8.5.0+11555+e0ab0d09
kernel-4.18.0-315.el8.x86_64
edk2-ovmf-20210527gite1999b264f1f-1.el8.noarch
Guest: RHEL.8.5.0, Win2022

Ran a round test of cpu hotplug/unplug under ovmf, all cases passed.

Comment 15 errata-xmlrpc 2021-11-09 18:06:53 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 (Moderate: edk2 security, bug fix, and enhancement update), 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-2021:4198