[Xen-bugs] [Bug 1725] New: [VT-D]run guest with NIC assigned will cause system hang sometimes under PAE on Sandy bridge

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1725

           Summary: [VT-D]run guest with NIC assigned will cause system hang
                    sometimes under PAE on Sandy bridge
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: shaohui.zheng@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): ia32
Guest Arch (ia32/ia32e/IA64): 
Guest OS Type (Linux/Windows):Linux
Change Set: 22372
Hardware: Sandybridge
Other:
xen-changeset:   22372:985f5fa8fc59
xen-date:        Mon Nov 08 17:25:54 2010 +0000

pvops git:
commit 6c72eadd151f6f1b904989532a83988af0ea661a
Merge: 7de2a73... bea6e71...
Author: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>

ioemu git:
commit 0442ec23f9efc4f8f9259351f612194f8f42900c
Author: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Date:   Mon Nov 8 17:09:54 2010 +0000

tboot changeset:
changeset:   244:2532ddd46f57
tag:         tip
user:        Joseph Cihula <joseph.cihula@xxxxxxxxx>
date:        Tue Nov 02 12:32:20 2010 -0700
summary:     Fixed bug with PCONF elements not displaying correctly



Bug detailed description:
--------------------------
For the Sandybridge ia32pae  platform, runing the vt-d guest in a row, system 
auto-reboot or hang .The same issue also happened  in cs 22364.The error log
from serial port is following:
(XEN) stdvga.c:147:d10 entering stdvga and caching modes
(XEN) vlapic.c:699:d10 Local APIC Write to read-only register 0x30
(XEN) vlapic.c:699:d10 Local APIC Write to read-only register 0x20
(XEN) vlapic.c:699:d10 Local APIC Write to read-only register 0x20
(XEN) domctl.c:1061:d0 ioport_map:remove f_gport=c100 f_mport=3000 np=20
(XEN) domctl.c:1037:d0 ioport_map:add f_gport=c100 f_mport=3000 np=20
(XEN) irq.c:243: Dom10 PCI link 0 changed 5 -> 0
(XEN) irq.c:243: Dom10 PCI link 1 changed 10 -> 0
(XEN) irq.c:243: Dom10 PCI link 2 changed 11 -> 0
(XEN) irq.c:243: Dom10 PCI link 3 changed 5 -> 0
(XEN) msi.c:815: MSI is already in use on device 04:00.0
(XEN) [VT-D]intremap.c:553: remap_entry_to_msi_msg: index (65535) get an empty
entry!

nt 1 of \uffff..xc_pm_get_max_px\uffff..y_cpuid\uffff..:nicom 2.1    | VT102 | 
    Offline


Reproduce steps:
----------------
1.prepare ten the vt-d guests at Sandybridge ia32pae machine.
2.run the command "xvs run "
3.we see the issue that system hang or auto-reboot

Current result:
----------------


Expected result:
----------------


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


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