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[Qemu-devel] [Bug 1747056] Re: FreeDOS / MS-Dos / Windows 3.11 cannot pe
From: |
Daniel Berrange |
Subject: |
[Qemu-devel] [Bug 1747056] Re: FreeDOS / MS-Dos / Windows 3.11 cannot perform reboot with 'isapc' machine |
Date: |
Mon, 05 Feb 2018 12:32:25 -0000 |
I bisected seabios and found this seabios change to be the cause of the
problem
commit b837e68d5a6c1a5945513f1995875445a1594c8a (refs/bisect/bad)
Author: Kevin O'Connor <address@hidden>
Date: Mon Nov 9 15:00:19 2015 -0500
resume: Make KVM soft reboot loop detection more flexible
Move the check for soft reboot loops from resume.c to shadow.c and
directly check for the case where the copy of the BIOS in flash
appears to be a memory alias instead. This prevents a hang if an
external reboot request occurs during the BIOS memcpy.
Signed-off-by: Kevin O'Connor <address@hidden>
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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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