Bug 802226

Summary:	Back to userspace when fail to allocate ioeventfd
Product:	Red Hat Enterprise Linux 6	Reporter:	Amos Kong <akong>
Component:	qemu-kvm	Assignee:	Amos Kong <akong>
Status:	CLOSED DUPLICATE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	6.3	CC:	acathrow, ailan, bsarathy, juzhang, mkenneth, mst, rhod, virt-maint
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-03-12 07:59:30 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Amos Kong 2012-03-12 07:26:29 UTC

Description of problem:

If we support pci-bridge, we would have more pci-devices.
Then kernel could not provide enough ioeventfd, virtio net/blk should go back to userspace when fail to allocate ioeventfd, not exit.


Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.233


How reproducible:
100%

Steps to Reproduce:
1. boot up guest with 232 virtio-blk

result: 
qemu would exit and output "unable to map ioeventfd: -28"

Comment 1 Amos Kong 2012-03-12 07:59:30 UTC

Talked with mst, we need to resolve bz 753692 by go back
to userspace when fail to allocate ioeventfd.

Need to open a new bug for my kernel fix+backport (bsearch lookup iobus devices)

*** This bug has been marked as a duplicate of bug 753692 ***