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+
+FreeDOS / MS-Dos / Windows 3.11 cannot perform reboot with 'isapc' machine
+
+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 <email 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
+
+I bisected seabios and found this seabios change to be the cause of the problem
+
+commit b837e68d5a6c1a5945513f1995875445a1594c8a (refs/bisect/bad)
+Author: Kevin O'Connor <email 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 <email address hidden>
+
+
+We need to pull in a SeaBIOS update with this fix applied to resolve this
+
+commit 42812e062a77b27b0544c8e0d46d206afc3b2fae
+Author: Kevin O'Connor <email address hidden>
+Date:   Thu Feb 22 20:29:27 2018 -0500
+
+    shadow: Don't invoke a shutdown on reboot unless in a reboot loop
+    
+    Old versions of KVM would map the same writable copy of the BIOS at
+    both 0x000f0000 and 0xffff0000.  As a result, a reboot on these
+    machines would result in a reboot loop.  So, the code attempts to
+    check for that situation and invoke a shutdown instead.
+    
+    Commit b837e68d changed the check to run prior to the first reboot.
+    However, this broke reboots on the QEMU isapc machine type.  Change
+    the reboot loop check to only be invoked after at least one reboot has
+    been attempted.
+    
+    Reported-by: Daniel P. Berrangé <email address hidden>
+    Signed-off-by: Kevin O'Connor <email address hidden>
+
+
+The SeaBIOS update mentioned by Daniel has been included here:
+https://git.qemu.org/?p=qemu.git;a=commitdiff;h=0b8f74488e50f
+
+So I assume this bug is fixed, thus closing this now. If you still can reproduce it with the latest version of QEMU, then please complain.
+