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

[Mark Cave-Ayland]

David has already queued the patches in his ppc-for-4.1 branch at
https://github.com/dgibson/qemu/commits/ppc-for-4.1 so they will get
merged soon. If you're working with git then I'd try testing the queued
branch first and see if that resolves the issue.

Once the patches have been applied to master we'll add a CC to the
stable list so the fixes will be included in the next 4.0 update.

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

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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