[Xen-bugs] [Bug 1728] New: [vt-d] [vt-d] Xen panic on PAE when enable iommu

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1728

           Summary: [vt-d] [vt-d] Xen panic on PAE when enable iommu
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: shaohui.zheng@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): PAE
Guest Arch (ia32/ia32e/IA64): 
Guest OS Type (Linux/Windows):
Change Set: 22764:75b6287626ee, 22812:73b3debb90cf
Hardware: Westmere-EP,Westmere-EX
Other:



Bug detailed description:
--------------------------

Xen panic on PAE host if enable iommu in grub parameter, This issue happens on
WSM-EP only, we did not see it on Sandy Bridge.

(XEN) Xen call trace:
(XEN)    [<ff1df95e>] pci_conf_read32+0x47/0x95
(XEN)    [<ff13e5d9>] pci_vtd_quirk+0x69/0x97
(XEN)    [<ff225b6f>] intel_iommu_dom0_init+0x93/0x18c
(XEN)    [<ff2257e3>] iommu_dom0_init+0xc1/0xc9
(XEN)    [<ff22e84c>] construct_dom0+0x1ac7/0x1adb
(XEN)    [<ff23672e>] __start_xen+0x2128/0x217a
(XEN)    [<ff10006c>] __high_start+0x58/0x5a
(XEN)    

it is a regression between CS 22654 and 22764.


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