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[Qemu-devel] [Bug 1279500] Re: system_powerdown causes SMP OpenBSD guest


From: Robert Urban
Subject: [Qemu-devel] [Bug 1279500] Re: system_powerdown causes SMP OpenBSD guest to freeze
Date: Fri, 14 Feb 2014 15:16:18 -0000

If someone needs to coordinate with someone from the OpenBSD team,
please talk to Mike Larkin <address@hidden>. He expressed an
intention to look into this problem from the OpenBSD side. I would be
delighted if I could supply Mike with a qemu contact person, of if
someone could contact him directly (and copy me, please), as I think he
wanted to investigate shortly.

Also worth mentioning: the problem can be reproduced using the OpenBSD
uniprocessor kernel in the guest, as long as mpbios(4) is enabled, which
is the default. Thus, a VM configured with a single CPU is sufficient to
reproduce.

To boot the uniprocessor kernel from my guest image, at the OpenBSD boot
prompt, type "boot /bsd". To make it permanent, edit /etc/boot.conf and
change "bsd.mp" to "bsd", or remove boot.conf entirely.

Rob Urban

-- 
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https://bugs.launchpad.net/bugs/1279500

Title:
  system_powerdown causes SMP OpenBSD guest to freeze

Status in QEMU:
  New

Bug description:
  system_powerdown causes an SMP OpenBSD guest to freeze. I can
  reproduce it with the following systems/versions:

    - Debian 6: QEMU PC emulator version 0.12.5 (qemu-kvm-0.12.5)
    - Fedora 20:
       qemu-system-x86-1.6.1 (from Fedora repository)
       qemu-1.7.0 (latest release version)
       qemu-1.7.50 (latest development snapshot, "git cloned" today, 20140212)

  all of the above hosts are running x86_64 linux.

  The first OpenBSD version that I ran as a VM, v5.1, experienced the
  problem. All subsequent versions experience the problem. The above
  tests were performed using OpenBSD v5.4 (amd64).

  I will open an OpenBSD bug report for this problem as well, and update
  this report with the OpenBSD bug ID.

  There's an interesting RedHat bug report concerning this problem:
    URL: https://bugzilla.redhat.com/show_bug.cgi?id=508801#c34

  Here an excerpt:
  -snip-
  Gleb Natapov 2009-12-23 10:37:44 EST

  I posted patch to provide correct PCI irq routing info in mptable to kvm 
  mailing list. It works for all devices except for SCI interrupt. BIOS
  programs SCI interrupt to be 9 as spec requires, but OpenBSD thinks that
  it is smarter and moves it to interrupts 10. Qemu will still send it on
  vector 9 and OpenBSD will enter the same infinity recursion. This can
  be triggered by issuing system_powerdown on qemu monitor.
  -snip-

  Michael Tokarev reported this problem on the kvm mailing list in 2011:
    URL: http://www.spinics.net/lists/kvm/msg51311.html

  I compiled qemu as follows:
  -snip-
  cd qemu-src-dir
  mkdir -p bin/native
  cd bin/native
  ../../configure \
        --prefix=/usr/local/qemu-dev-snapshot-20140212 \
        --target-list=x86_64-softmmu \
        --enable-kvm \
        --enable-spice \
        --with-gtkabi="3.0" \
        --audio-drv-list=pa,sdl,alsa,oss \
        --extra-cflags='-I/usr/include/SDL'
  -snip-

  I'm running OpenBSD with the following command:
  -snip-
  #!/bin/bash

  DEF=/usr/bin/qemu-system-x86_64
  QEMU_LATEST=/usr/local/qemu-1.7.0/bin/qemu-system-x86_64
  QEMU_DEV=/usr/local/qemu-dev-snapshot-20140212/bin/qemu-system-x86_64

  $QEMU_DEV \
        -machine accel=kvm \
        -name obsdtest-v54 \
        -S \
        -machine pc-i440fx-1.6,accel=kvm,usb=off \
        -boot c \
        -m 2048 \
        -realtime mlock=off \
        -smp 2,sockets=2,cores=1,threads=1 \
        -uuid 8b685793-2510-473e-b97e-822a4cf2fbca \
        -no-user-config \
        -monitor stdio \
        -rtc base=utc,driftfix=slew \
        -global kvm-pit.lost_tick_policy=discard \
        -no-hpet \
        -drive 
file=/guest_images/obsdtest_v54.raw,if=none,id=drive-virtio-disk0,format=raw,cache=none
 \
        -device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
 \
        -drive if=none,id=drive-ide0-0-0,readonly=on,format=raw \
        -device ide-cd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \
        -chardev pty,id=charserial0 \
        -device isa-serial,chardev=charserial0,id=serial0 \
        -k en-us \
        -device cirrus-vga,id=video0,bus=pci.0,addr=0x3 \
        -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 \
        -net nic \
        -net user
  -snip-

  The OpenBSD disk image I used for testing is 143MB compressed, 10G
  uncompressed. It can be found here:

    http://www.spielwiese.de/OpenBSD/obsd54.raw.7z

  The root password is "x".

  Rob Urban

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