I just installed and booted opensolaris with no problems under natty.
I'll try under maverick as well.
My cmdline was simply
qemu-kvm -hda solaris.img -cdrom Downloads/opensolaris.iso -m 1024 -smp 2 -boot d -vnc :1
to install and
qemu-kvm -hda solaris.img -boot c -m 1024 -smp 2 -vnc :1
to boot.
I just installed and booted opensolaris with no problems under natty.
I'll try under maverick as well.
My cmdline was simply opensolaris. iso -m 1024 -smp 2 -boot d -vnc :1
qemu-kvm -hda solaris.img -cdrom Downloads/
to install and
qemu-kvm -hda solaris.img -boot c -m 1024 -smp 2 -vnc :1
to boot.