[Qemu-devel] [Bug 1090726] Re: qemu does not generate guest cpu topology properly

[Thomas Huth]

Triaging old bug tickets... can you still reproduce this issue with the
latest version of QEMU? Or could we close this ticket nowadays?

** Changed in: qemu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1090726

Title:
  qemu does not generate guest cpu topology properly

Status in QEMU:
  Incomplete

Bug description:
  Adding the option

  -smp 12,sockets=2,cores=6,threads=1

  exposes

  
  Machine (12GB)
    Socket #0
          L2 L#0 (512KB) + L1 L#0 (64KB) + Core L#0 + PU L#0 (P#0)
          L2 L#1 (512KB) + L1 L#1 (64KB) + Core L#1 + PU L#1 (P#1)
          L2 L#2 (512KB) + L1 L#2 (64KB) + Core L#2 + PU L#2 (P#2)
          L2 L#3 (512KB) + L1 L#3 (64KB) + Core L#3 + PU L#3 (P#3)
          L2 L#4 (512KB) + L1 L#4 (64KB) + Core L#4 + PU L#4 (P#4)
          L2 L#5 (512KB) + L1 L#5 (64KB) + Core L#5 + PU L#5 (P#5)
          L2 L#6 (512KB) + L1 L#6 (64KB) + Core L#6 + PU L#6 (P#6)
          L2 L#7 (512KB) + L1 L#7 (64KB) + Core L#7 + PU L#7 (P#7)
    Socket #1
        L2 L#8 (512KB) + L1 L#8 (64KB) + Core L#8 + PU L#8 (P#8)
        L2 L#9 (512KB) + L1 L#9 (64KB) + Core L#9 + PU L#9 (P#9)
        L2 L#10 (512KB) + L1 L#10 (64KB) + Core L#10 + PU L#10 (P#10)
        L2 L#11 (512KB) + L1 L#11 (64KB) + Core L#11 + PU L#11 (P#11)

  
  Rather than:

  Machine (12GB)
    Socket #0
          L2 L#0 (512KB) + L1 L#0 (64KB) + Core L#0 + PU L#0 (P#0)
          L2 L#1 (512KB) + L1 L#1 (64KB) + Core L#1 + PU L#1 (P#1)
          L2 L#2 (512KB) + L1 L#2 (64KB) + Core L#2 + PU L#2 (P#2)
          L2 L#3 (512KB) + L1 L#3 (64KB) + Core L#3 + PU L#3 (P#3)
          L2 L#4 (512KB) + L1 L#4 (64KB) + Core L#4 + PU L#4 (P#4)
          L2 L#5 (512KB) + L1 L#5 (64KB) + Core L#5 + PU L#5 (P#5)
    Socket #1
          L2 L#6 (512KB) + L1 L#6 (64KB) + Core L#6 + PU L#6 (P#6)
          L2 L#7 (512KB) + L1 L#7 (64KB) + Core L#7 + PU L#7 (P#7)
          L2 L#8 (512KB) + L1 L#8 (64KB) + Core L#8 + PU L#8 (P#8)
          L2 L#9 (512KB) + L1 L#9 (64KB) + Core L#9 + PU L#9 (P#9)
          L2 L#10 (512KB) + L1 L#10 (64KB) + Core L#10 + PU L#10 (P#10)
          L2 L#11 (512KB) + L1 L#11 (64KB) + Core L#11 + PU L#11 (P#11)

  
  Here is a cpuid dump from inside the guest and dump from more recent version 
of cpuid, in which you can see a bit more detail. The later contains data for a 
single CPU, because the others are the same.

  Reproducible on qemu 1.0 and 1.2. with guest os Fedora 17, Debian 6,
  Debian Squeeze and Windows 2008 R2.

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