[Bug 83381] New: 4-ports 82576 detect 2 ports when add "intel_iommu=on pci=assign-busses".

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=83381

            Bug ID: 83381
           Summary: 4-ports 82576 detect 2 ports when add "intel_iommu=on
                    pci=assign-busses".
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.17.0-rc1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: chao.zhou@intel.com
        Regression: No

Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows):linux
kvm.git Commit:54ad89b05ec49b90790de814647b244d3d2cc5ca
qemu.git Commit:c47c61be8dcd91689c8fc77776db924d684c3b39
Host Kernel Version:3.17.0-rc1
Hardware:HSW-Desktop

Bug detailed description:
--------------------------
the 4-ports 82576 can detect 2 ports when add "intel_iommu=on
pci=assign-busses" in kernel of grub.
the 4-ports 82576 can detect 4 ports without "intel_iommu=on pci=assign-busses"
when add "intel_iommu=on", 4-ports 82576 detected 4 ports.
when add "pci=assign-busses" ,the 4-ports 82576 can detect 2 ports.

note: 
kernel version: 3.0.0+ (kvm+qemu-kvm:e72ef590_fda19064)
1.the 4-ports 82576 can detect 4 ports when add "intel_iommu=on
pci=assign-busses".
2. when add "intel_iommu=on" or "pci=assign-busses" to boot the system, 4-ports
82576 detected 4 ports


Reproduce steps:
----------------
1. add "intel_iommu=on pci=assign-busses" in kernel of grub
2. boot up the system
3. lspci | grep Eth

Current result:
----------------
4-ports 82576 detect 2 ports

Expected result:
----------------
4-ports 82576 detect 4 ports



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

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