Bug 643310

Summary:	Guest failed to get ip after hot add NIC card
Product:	Red Hat Enterprise Linux 5	Reporter:	juzhang <juzhang>
Component:	kvm	Assignee:	Michael S. Tsirkin <mst>
Status:	CLOSED WONTFIX	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.6	CC:	michen, mkenneth, virt-maint
Target Milestone:	rc	Keywords:	Triaged
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-03-16 18:10:01 UTC	Type:	---
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:	580946

Description juzhang 2010-10-15 09:05:08 UTC

Description of problem:
Boot guest,then hot added nic using the following command:
(qemu)pci_add pci_addr=auto nic vlan=2,macaddr=00:1a:4e:9f:0b:60,model=virtio
(qemu)host_net_add tap script=/etc/qemu-ifup,vlan=2
however,guests can't get ip.


Version-Release number of selected component (if applicable):
#rpm -qa | grep kvm
kvm-qemu-img-83-204.el5
kvm-debuginfo-83-204.el5
etherboot-roms-kvm-5.4.4-13.el5
kvm-tools-83-204.el5
kmod-kvm-83-204.el5
etherboot-zroms-kvm-5.4.4-13.el5
kvm-83-204.el5


How reproducible:
100%

Steps to Reproduce:
1.boot guest
#/usr/libexec/qemu-kvm -rtc-td-hack -no-hpet -usbdevice tablet -drive file=/var/lib/libvirt/images/demo.raw,if=virtio,format=raw,werror=stop,boot=on -net nic,macaddr=10:10:20:34:23:12,model=virtio,vlan=0 -net tap,script=/etc/qemu-ifup,vlan=0 -uuid `uuidgen` -vnc :20 -cpu qemu64,+sse2 -smp 2 -m 2G -monitor stdio -drive file=/dev/cdrom,if=ide,media=cdrom -balloon virtio
2.hot add nic
2.1 (qemu) pci_add pci_addr=auto nic vlan=2,macaddr=00:1a:4e:9f:0b:60,model=virtio
OK domain 0, bus 0, slot 7, function 0
2.2 (qemu) host_net_add tap script=/etc/qemu-ifup,vlan=2
3.check network
(qemu)info network 
VLAN 0 devices:
  tap.0: ifname=tap1,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown
  virtio.0: model=virtio,macaddr=10:10:20:34:23:12
VLAN 2 devices:
  virtio.2: model=virtio,macaddr=00:1a:4e:9f:0b:60
  tap.2: ifname=tap4,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown

Actual results:
Guest find new nic,however,failed to get ip

Expected results:
Guest can get ip.

Additional info:
1. Using the same steps,when hot added nic,if  first issue command (qemu)host_net_add tap script=/etc/qemu-ifup,vlan=2,then issue command (qemu)pci_add pci_addr=auto nic vlan=2,macaddr=00:1a:4e:9f:0b:60,model=virtio.
Guest can get ip.

 (qemu) host_net_add tap script=/etc/qemu-ifup,vlan=2
 (qemu) pci_add pci_addr=auto nic vlan=2,macaddr=00:1a:4e:9f:0b:60,model=virtio
OK domain 0, bus 0, slot 7, function 0

2. I  tested rhel6 and windows2008 r2,both hit this problem.

Comment 4 RHEL Program Management 2011-01-11 20:16:48 UTC

This request was evaluated by Red Hat Product Management for
inclusion in the current release of Red Hat Enterprise Linux.
Because the affected component is not scheduled to be updated in the
current release, Red Hat is unfortunately unable to address this
request at this time. Red Hat invites you to ask your support
representative to propose this request, if appropriate and relevant,
in the next release of Red Hat Enterprise Linux.

Comment 5 RHEL Program Management 2011-01-11 22:53:42 UTC

This request was erroneously denied for the current release of
Red Hat Enterprise Linux.  The error has been fixed and this
request has been re-proposed for the current release.