Just noticed this post was missing the initial information:

<mdomsch> hpa: your test ISO shows: vesamenu.c32: attempted DOS system call INT 2C 42C4 D00004F0
<mdomsch> when run under latest F9 virt-manager started KVM machine
<mdomsch> hpa, but does _not_ fail as such when run manually with
<mdomsch> sudo qemu-kvm -M pc -m 512 -hda /var/lib/libvirt/images/hpa.img -cdrom /var/tmp/boot-fc9-3.70-pre26.iso
<mdomsch> hpa, which means one of these args is probably causing it
<mdomsch> /usr/bin/qemu-kvm -S -M pc -m 512 -smp 1 -name foo -monitor pty -boot c -drive file=/var/lib/libvirt/images/foo.img,if=ide,index=0,boot=on -drive file=,if=ide,media=cdrom,index=2 -net nic,macaddr=00:16:3e:13:75:3a,vlan=0 -net tap,fd=13,script=,vlan=0,ifname=vnet0 -serial pty -parallel none -usb -vnc 127.0.0.1:0 -k en-us



For what it's worth, it's the "boot=on" part that is causing extboot to be invoked, which is what is causing the failure.

I have to admit I don't really understand why extboot hooks INT 13h at all (why emulate a disk on a system where disks are virtual anyway?), but more seriously, it has the problem that:

a) it uses vectors in OS reserved space;
b) it doesn't clean up after itself after giving up and before invoking
   the old INT 19h vector.

        -hpa
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