Bug 1003744 - Booting VM with virtio disks/virtio network(multifunction=on) caused QEMU error(unable to map ioeventfd: -28)
Booting VM with virtio disks/virtio network(multifunction=on) caused QEMU er...
Status: CLOSED WONTFIX
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: qemu-kvm (Show other bugs)
6.5
x86_64 Linux
low Severity medium
: rc
: ---
Assigned To: Michael S. Tsirkin
Virtualization Bugs
:
Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2013-09-03 02:14 EDT by zhonglinzhang
Modified: 2014-04-01 12:24 EDT (History)
9 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Environment:
Last Closed: 2014-04-01 12:24:11 EDT
Type: Bug
Regression: ---
Mount Type: ---
Documentation: ---
CRM:
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


Attachments (Terms of Use)
with 100 virtio network (18.09 KB, text/plain)
2013-09-03 02:16 EDT, zhonglinzhang
no flags Details
with 200 virtio disks (37.80 KB, text/plain)
2013-09-03 02:17 EDT, zhonglinzhang
no flags Details

  None (edit)
Description zhonglinzhang 2013-09-03 02:14:39 EDT
Description of problem:
+++ This bug was initially created as a clone of Bug #753692 +++

1. During boot win2012 guest with 100 virtio network, it causes qemu-kvm show  the following information:
(qemu) qemu-kvm: virtio_pci_set_host_notifier_internal: unable to map ioeventfd: -28 
vhost VQ 1 notifier binding failed: 28

2. Boot win2012 guest with more than 200 virtio disks, cause qemu-kvm show the following information:
(qemu) qemu-kvm: virtio_pci_set_host_notifier_internal: unable to map ioeventfd: -28
qemu-kvm: virtio_pci_start_ioeventfd: failed. Fallback to a userspace (slower).

Version-Release number of selected component (if applicable):
kernel: 2.6.32-414.el6.x86_64
qemu-kvm: qemu-kvm-0.12.1.2-2.398.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Boot win2012 guest with 100 virtio network, the following command line:
in attachment virtio-network

2. Boot win2012 guest with more than 200 virtio disks
in attachment virtio-disks

3.

Actual results:
1. win2012 guest with 100 virtio network: 
(qemu) qemu-kvm: virtio_pci_set_host_notifier_internal: unable to map ioeventfd: -28
vhost VQ 1 notifier binding failed: 28

2. win2012 guest with more than 200 virtio disks
(qemu) qemu-kvm: virtio_pci_set_host_notifier_internal: unable to map ioeventfd: -28
qemu-kvm: virtio_pci_start_ioeventfd: failed. Fallback to a userspace (slower).

Expected results:
guest boot successful

Additional info:
Comment 1 zhonglinzhang 2013-09-03 02:16:18 EDT
Created attachment 793026 [details]
with 100 virtio network
Comment 2 zhonglinzhang 2013-09-03 02:17:30 EDT
Created attachment 793027 [details]
with 200 virtio disks

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