Bug 1736263

Summary:	Allow virtio-iommu migration
Product:	Red Hat Enterprise Linux Advanced Virtualization	Reporter:	Eric Auger <eric.auger>
Component:	qemu-kvm	Assignee:	Eric Auger <eric.auger>
qemu-kvm sub component:	Devices	QA Contact:	Virtualization Bugs <virt-bugs>
Status:	CLOSED DUPLICATE	Docs Contact:
Severity:	medium
Priority:	medium	CC:	dgilbert, drjones, juzhang, lcapitulino, mst, qzhang, virt-maint
Version:	8.0	Keywords:	OtherQA
Target Milestone:	rc
Target Release:	8.4
Hardware:	aarch64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-11-12 07:42:32 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:
Embargoed:
Bug Depends On:
Bug Blocks:	1727536, 1802982, 1885765

Description Eric Auger 2019-08-01 16:20:53 UTC

At the moment the virtio-iommu is not migratable. Besides the virtio generic stuff, its state is composed of

- domains organized in a GTree (red black tree): each domain owns a list of end points using it and a gtree of iommu mappings.
- a gtree of endpoints and each enpoint owns a gtree of reserved regions. 

There is currently no VMSTATE_* object that allows migrating Gtree elements.

The closest thing seems to be VMSTATE_QTAILQ_V that allows to migrate a QTAILQ.

Comment 1 Eric Auger 2019-10-03 15:49:40 UTC

"[PATCH v2] migration: Support gtree migration" was sent to the ML.
This is a pre-requisite for virtio-iommu migration as this latter has many gtrees

Comment 2 Ademar Reis 2020-02-05 23:01:52 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 Eric Auger 2020-02-28 09:38:16 UTC

The code has landed upstream (will be in qemu 5.0) . Migration was tested on ARM.

Comment 4 Eric Auger 2020-06-03 07:54:51 UTC

Until non DT support is not supported we can claim the feature is available (despite the code is upstream). So let's move this to 8.4

Comment 6 Eric Auger 2020-11-12 07:42:32 UTC

Code is upstream and we now just wait for the ACPI VIOT integration. Let's close the BZ as a dup of the main virtio-iommu BZ.

*** This bug has been marked as a duplicate of bug 1477099 ***