[Qemu-devel] [Bug 1747056] [NEW] FreeDOS / MS-Dos / Windows 3.11 cannot perform reboot with 'isapc' machine

[Daniel Berrange]

Public bug reported:

I was installing MS-Dos 6.22 + Windows 3.11 in preparation for running
Microsoft Bob, and noticed that when they try to perform a reboot, they
just get stuck. The console cursor stays flashing on/off, but the DOS
prompt no longer responds to input.

It is fairly easy to reproduce, even FreeDOS is impacted - download the
FreeDOS bootable CDROM image, then

$ qemu-img create demo.img 100MB

$ qemu-system-x86_64 -machine isapc -cdrom ~/Downloads/FD12CD.iso  -hda
demo.img  -monitor stdio

Wait for the installer to startup, and then in the monitor console run

  sendkey ctrl-alt-delete

It will fail to reboot

Testing shows this is a regression from QEMU 2.8.0 onwards, and git
bisect further narrowed it down to a SEABIOS update

commit 6e99f5741ff1b408ea76e6caf2bd4f76df4060e9 (HEAD, tag: 
pull-seabios-20161027-2, tag: pull-seabios-20161027-1, refs/bisect/bad)
Author: Gerd Hoffmann <address@hidden>
Date:   Thu Oct 27 16:42:28 2016 +0200

    seabios: update to 1.10.0 release.

Note that this seems particular to the "isapc" machine type - with the
"pc" machine type, reboot still works

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1747056

Title:
  FreeDOS / MS-Dos / Windows 3.11 cannot perform reboot with 'isapc'
  machine

Status in QEMU:
  New

Bug description:
  I was installing MS-Dos 6.22 + Windows 3.11 in preparation for running
  Microsoft Bob, and noticed that when they try to perform a reboot,
  they just get stuck. The console cursor stays flashing on/off, but the
  DOS prompt no longer responds to input.

  It is fairly easy to reproduce, even FreeDOS is impacted - download
  the FreeDOS bootable CDROM image, then

  $ qemu-img create demo.img 100MB

  $ qemu-system-x86_64 -machine isapc -cdrom ~/Downloads/FD12CD.iso
  -hda demo.img  -monitor stdio

  Wait for the installer to startup, and then in the monitor console run

    sendkey ctrl-alt-delete

  It will fail to reboot

  Testing shows this is a regression from QEMU 2.8.0 onwards, and git
  bisect further narrowed it down to a SEABIOS update

  commit 6e99f5741ff1b408ea76e6caf2bd4f76df4060e9 (HEAD, tag: 
pull-seabios-20161027-2, tag: pull-seabios-20161027-1, refs/bisect/bad)
  Author: Gerd Hoffmann <address@hidden>
  Date:   Thu Oct 27 16:42:28 2016 +0200

      seabios: update to 1.10.0 release.

  Note that this seems particular to the "isapc" machine type - with the
  "pc" machine type, reboot still works

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