[Qemu-devel] [Bug 1829576] Re: QEMU-SYSTEM-PPC64 Regression QEMU-4.0.0

[Ivan Warren]

I also have a regression issue between 3.1.0 and 4.0.0 (actually latest
git) on qemu-system-ppc64 but it involves an AIX guest instead (fail to
boot). Should I open a new ticket or hop on this one ?

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Title:
  QEMU-SYSTEM-PPC64 Regression QEMU-4.0.0

Status in QEMU:
  New

Bug description:
  I have been using QEMU-SYSTEM-PPC64 v3.1.0 to run CentOS7 PPC emulated
  system. It stopped working when I upgraded to QEMU-4.0.0 . I
  downgraded back to QEMU-3.1.0 and it started working again. The
  problem is that my CentOS7 image will not boot up udner QEMU-4.0.0,
  but works fine under QEMU-3.1.0.

  I have an QCOW2 image available at
  https://www.mediafire.com/file/d8dda05ro85whn1/linux-
  centos7-ppc64.qcow2/file . NOTE: It is 15GB. Kind of large.

  I run it as follows:

     qemu-system-ppc64 \
        -name "CENTOS7-PPC64" \
        -cpu POWER7 -machine pseries \
        -m 4096 \
        -netdev bridge,id=netbr0,br=br0 \
        -device e1000,netdev=netbr0,mac=52:54:3c:13:21:33 \
        -hda "./linux-centos7-ppc64.qcow2" \
        -monitor stdio

  HOST: I am using Manjaro Linux on an Intel i7 machine with the QEMU
  packages installed via the package manager of the distribution.

  address@hidden ~]$ uname -a
  Linux jlsws0.haivision.com 4.19.42-1-MANJARO #1 SMP PREEMPT Fri May 10 
20:52:43 UTC 2019 x86_64 GNU/Linux

  address@hidden ~]$ cpuinfo 
  Intel(R) processor family information utility, Version 2019 Update 3 Build 
20190214 (id: b645a4a54)
  Copyright (C) 2005-2019 Intel Corporation.  All rights reserved.

  =====  Processor composition  =====
  Processor name    : Intel(R) Core(TM) i7-6700K  
  Packages(sockets) : 1
  Cores             : 4
  Processors(CPUs)  : 8
  Cores per package : 4
  Threads per core  : 2

  =====  Processor identification  =====
  Processor     Thread Id.      Core Id.        Package Id.
  0             0               0               0   
  1             0               1               0   
  2             0               2               0   
  3             0               3               0   
  4             1               0               0   
  5             1               1               0   
  6             1               2               0   
  7             1               3               0   
  =====  Placement on packages  =====
  Package Id.   Core Id.        Processors
  0             0,1,2,3         (0,4)(1,5)(2,6)(3,7)

  =====  Cache sharing  =====
  Cache Size            Processors
  L1    32  KB          (0,4)(1,5)(2,6)(3,7)
  L2    256 KB          (0,4)(1,5)(2,6)(3,7)
  L3    8   MB          (0,1,2,3,4,5,6,7)

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