[Bug 43328] New: VT-d/SR-IOV doesn't work in guest

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

https://bugzilla.kernel.org/show_bug.cgi?id=43328

           Summary: VT-d/SR-IOV doesn't work in guest
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.4.0
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx
        ReportedBy: yongjie.ren@xxxxxxxxx
                CC: avi@xxxxxxxxxx
        Regression: No


Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows):Linux
kvm.git Commit:b48b2c3e50433ff6f7e46186daa7f986bd960215
qemu-kvm Commit:18a188f66237e7b38fc8133d3862e5904c0e7ffb
Host Kernel Version:3.4.0
Hardware:WSM-EP, Romley-EP


Bug detailed description:
--------------------------
Assign a VF or normal NIC to the guest, the guest cannot get IP address.
Note:1. assign the VF of  Intel 82576 NIC or 82599 NIC, the guest cannot get IP
     2. hot plug a VF to the guest, the guest cannot get IP
     3. assign a PF to the guest, the guest cannot get IP.


kvm(next) + qemu-kvm   =  result
b48b2c3e + 18a188f6   =  bad 
322728e5 + 18a188f6   =  good



Reproduce steps:
----------------
1. ./pcistub.sh -h 08:10.0   ( to hide a device)
2. qemu-system-x86_64 -m 512 -device pci-assign,host=08:10.0 -net none -hda
rhel6u1.qcow

Current result:
----------------
The guest cannot get IP

Expected result:
----------------
The guest can get IP

Basic root-causing log:
----------------------
[root@vt-snb9 ~]# qemu-system-x86_64 -m 512 -device pci-assign,host=08:10.0
-net none -hda rhel6u1.qcow 
VNC server running on `::1:5900'
assigned_dev_enable_msix: assign irq: Invalid argument
fail to set MSI-X entry number for MSIX! Invalid argument
assigned_dev_update_msix_mmio: Invalid argument
fail to set MSI-X entry number for MSIX! Invalid argument
assigned_dev_update_msix_mmio: Invalid argument

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