[Xen-bugs] [Bug 1515] New: VFs cannot be created due to intremap index exceeding limit

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1515

           Summary: VFs cannot be created due to intremap index exceeding
                    limit
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jiajun.xu@xxxxxxxxx


Environment:
------------
Service Arch (ia32/ia32e/IA64): IA32E
Guest Arch (ia32/ia32e/IA64): 
Guest OS Type (Linux/Windows):
Change Set:    20145
Hardware: Nehalem-EP with around 10 PFs, 3 I/O APICs
Other:


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

This happens on a Nehalem-EP who has around 10 PFs. trying to create VF using
max_vfs=7 leads the error message, and some VFs fail to be created.


Reproduce steps:
----------------
1. choose a platform that can create many VFs
2. use extra_guest_irqs=8,256 to boot xen to ensure d->nr_pirqs won't impact
3. rmmod igb && modprobe igb max_vfs=7


Basic root-causing log:
----------------------
xm dmesg shows the following

(XEN) [VT-D]intremap.c:517: msi_msg_to_remap_entry: intremap index (275) is
larger than the maximum index (255)!

and then assingment fails. There are many more lines, form intremap index 256
up to around 280


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