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[Qemu-devel] [Bug 1815143] Re: qemu-system-s390x fails when running with

From: Thomas Huth
Subject: [Qemu-devel] [Bug 1815143] Re: qemu-system-s390x fails when running without kvm: fatal: EXECUTE on instruction prefix 0x7f4 not implemented
Date: Fri, 08 Feb 2019 04:35:49 -0000

Which version of QEMU are you using here? I think this should be working
fine with the latest version of QEMU (>= v2.10).

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

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   qemu-system-s390x fails when running without kvm: fatal: EXECUTE on
  instruction prefix 0x7f4 not implemented

Status in QEMU:

Bug description:
  just wondering if TCG implements instruction prefix 0x7f4

  server3:~ # zcat /boot/vmlinux-4.4.162-94.72-default.gz > /tmp/kernel

  --> starting qemu with kvm enabled works fine
  server3:~ # qemu-system-s390x -nographic -kernel /tmp/kernel -initrd 
/boot/initrd -enable-kvm
  Initializing cgroup subsys cpuset
  Initializing cgroup subsys cpu
  Initializing cgroup subsys cpuacct
  Linux version 4.4.162-94.72-default (address@hidden) (gcc version 4.8.5 (SUSE 
Linux) ) #1 SMP Mon Nov 12 18:57:45 UTC 2018 (9de753f)
  setup.289988: Linux is running under KVM in 64-bit mode
  setup.b050d0: The maximum memory size is 128MB
  numa.196305: NUMA mode: plain
  Write protected kernel read-only data: 8692k

  --> but starting qemu without kvm enabled works fails
  server3:~ # qemu-system-s390x -nographic -kernel /tmp/kernel -initrd 
  qemu: fatal: EXECUTE on instruction prefix 0x7f4 not implemented

  PSW=mask 0000000180000000 addr 000000000067ed6e cc 00
  R00=0000000080000000 R01=000000000067ed76 R02=0000000000000000 
  R04=0000000000111548 R05=0000000000000000 R06=0000000000000000 
  R08=00000000000100f6 R09=0000000000000000 R10=0000000000000000 
  R12=0000000000ae2000 R13=0000000000681978 R14=0000000000111548 
  F00=0000000000000000 F01=0000000000000000 F02=0000000000000000 
  F04=0000000000000000 F05=0000000000000000 F06=0000000000000000 
  F08=0000000000000000 F09=0000000000000000 F10=0000000000000000 
  F12=0000000000000000 F13=0000000000000000 F14=0000000000000000 
  V00=00000000000000000000000000000000 V01=00000000000000000000000000000000
  V02=00000000000000000000000000000000 V03=00000000000000000000000000000000
  V04=00000000000000000000000000000000 V05=00000000000000000000000000000000
  V06=00000000000000000000000000000000 V07=00000000000000000000000000000000
  V08=00000000000000000000000000000000 V09=00000000000000000000000000000000
  V10=00000000000000000000000000000000 V11=00000000000000000000000000000000
  V12=00000000000000000000000000000000 V13=00000000000000000000000000000000
  V14=00000000000000000000000000000000 V15=00000000000000000000000000000000
  V16=00000000000000000000000000000000 V17=00000000000000000000000000000000
  V18=00000000000000000000000000000000 V19=00000000000000000000000000000000
  V20=00000000000000000000000000000000 V21=00000000000000000000000000000000
  V22=00000000000000000000000000000000 V23=00000000000000000000000000000000
  V24=00000000000000000000000000000000 V25=00000000000000000000000000000000
  V26=00000000000000000000000000000000 V27=00000000000000000000000000000000
  V28=00000000000000000000000000000000 V29=00000000000000000000000000000000
  V30=00000000000000000000000000000000 V31=00000000000000000000000000000000
  C00=0000000000000000 C01=0000000000000000 C02=0000000000000000 
  C04=0000000000000000 C05=0000000000000000 C06=0000000000000000 
  C08=0000000000000000 C09=0000000000000000 C10=0000000000000000 
  C12=0000000000000000 C13=0000000000000000 C14=0000000000000000 

  Aborted (core dumped)

  server3:~ # lscpu
  Architecture:          s390x
  CPU op-mode(s):        32-bit, 64-bit
  Byte Order:            Big Endian
  CPU(s):                2
  On-line CPU(s) list:   0,1
  Thread(s) per core:    1
  Core(s) per socket:    1
  Socket(s) per book:    1
  Book(s) per drawer:    1
  Drawer(s):             2
  NUMA node(s):          1
  Vendor ID:             IBM/S390
  Machine type:          2964
  BogoMIPS:              20325.00
  Hypervisor:            z/VM 6.4.0
  Hypervisor vendor:     IBM
  Virtualization type:   full
  Dispatching mode:      horizontal
  L1d cache:             128K
  L1i cache:             96K
  L2d cache:             2048K
  L2i cache:             2048K
  L3 cache:              65536K
  L4 cache:              491520K
  NUMA node0 CPU(s):     0-63
  Flags:                 esan3 zarch stfle msa ldisp eimm dfp edat etf3eh 
highgprs te vx sie
  server3:~ # uname -a
  Linux server3 4.4.126-94.22-default #1 SMP Wed Apr 11 07:45:03 UTC 2018 
(9649989) s390x s390x s390x GNU/Linux
  server3:~ #

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