[Qemu-devel] [Bug 1829576] [NEW] PPC64 Regression QEMU-4.0.0

[Jose Santiago]

Public bug reported:

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)

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1829576

Title:
  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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