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Bug 1379389

Summary:	Filesystem passthrough "virtio-9pfs" support in KVM is missing in RHEL7
Product:	Red Hat Enterprise Linux 7	Reporter:	John L Magee <jlmagee>
Component:	virt-manager	Assignee:	Pavel Hrdina <phrdina>
Status:	CLOSED NOTABUG	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	jsuchane, juzhou, mxie, mzhan, tzheng, xiaodwan
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-17 12:48:03 UTC	Type:	Bug
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:	1401400

Description John L Magee 2016-09-26 14:43:26 UTC

Description of problem:
Filesystem passthrough "virtio-9pfs" support in KVM is not implemented in RHEL7 

Version-Release number of selected component (if applicable):
7+

How reproducible:
NA

Steps to Reproduce:
1. NA
2.
3.

Actual results:
NA

Expected results:
NA

Additional info:
See https://access.redhat.com/discussions/1119043

Virt-Manager and probably most of libvirt still support device definition with no warning. There is no mention of this at libvirt.org.  the user finds out only after configuring a filesystem and then getting a "mount: unknown filesystem type '9p'" in the guest and undertaking research.

This may be old news but it is frustrating.

Comment 3 Pavel Hrdina 2017-01-17 12:48:03 UTC

This is not a bug, in RHEL-7 the filesystem passthrough was disabled because 9p is not reliable.

You can find more information in the discussion that you've provided as additional info.  Virt-manager in RHEL-7 correctly prints message "Not supported for this hypervisor/libvirt combination." if you try to add a new filesystem device.

There was a bug to disable 9p in RHEL-7 bug 1077172.