[Xen-bugs] [Bug 1709] New: [vt-d] ubuntu PAE SMP guest has network problem with NIC assigned

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1709

           Summary: [vt-d] ubuntu PAE SMP guest has network problem with NIC
                    assigned
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: shaohui.zheng@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32/ia32e
Guest Arch (ia32/ia32e/IA64): ia32
Guest OS Type (Linux/Windows):Linux
Change Set: 22364
Hardware: sandy bridge
Other:
version info:
xen-changeset:   22364:0d5f09e3728c
xen-date:        Thu Nov 04 16:42:34 2010 +0000

pvops git:
commit 6c72eadd151f6f1b904989532a83988af0ea661a
Merge: 7de2a73... bea6e71...
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
Date:   Fri Oct 29 17:54:51 2010 -0700

ioemu git:
commit e995698610ef5f2d812db6b81d0a71b077bc9695
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Wed Nov 3 12:46:45 2010 +0000


Bug detailed description:
--------------------------
we created an ubuntu PAE guest with NIC assigned and 2 vcpus. After guest
started up, we seen guest owned ip (use ifconfig), but there were no package
replied when using ping to test network.For example:

[root@vt-snb3 media]# ifconfig
eth1      Link encap:Ethernet  HWaddr 00:1b:21:61:b1:63
          inet addr:192.168.169.186  Bcast:192.168.255.255  Mask:255.255.0.0
          inet6 addr: fe80::21b:21ff:fe61:b163/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:24 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2965 (2.9 KB)  TX bytes:810 (810.0 B)
          Memory:f30c0000-f30e0000

[root@vt-snb3 media]#route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.0     *               255.255.0.0     U     0      0        0 eth1
default         192.168.199.1   0.0.0.0         UG    0      0        0 eth1

[root@vt-snb3 media]#ping 192.168.199.1
PING 192.168.199.1 (192.168.199.1) 56(84) bytes of data.
>From 192.168.169.186 icmp_seq=2 Destination Host Unreachable
>From 192.168.169.186 icmp_seq=3 Destination Host Unreachable
>From 192.168.169.186 icmp_seq=4 Destination Host Unreachable
>From 192.168.169.186 icmp_seq=5 Destination Host Unreachable
>From 192.168.169.186 icmp_seq=6 Destination Host Unreachable
>From 192.168.169.186 icmp_seq=7 Destination Host Unreachable

I checked the dmesg in guest, no fail or error. And this issue only been seen
on ubuntu PAE SMP. Redhat, ubuntu 32e and ubutun PAE UP guest don't have this
problem.

Reproduce steps:
----------------
1.install latest xen-unstable(22364)
2.give ubuntu PAE guest with 2(or more)vcpus 
3.assign a NIC to guest
4.using xm create config to start guest
5.After guest start up successful, using ping to check network

Current result:
----------------
ping fail

Expected result:
----------------
ping successful

Basic root-causing log:
----------------------


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