On Wed, 11 Apr 2012, Peter Maydell wrote: > On 5 April 2012 10:35, Wei Liu wrote: > > > > --- /dev/null > > +++ b/hw/xen_apic.c > > @@ -0,0 +1,90 @@ > > +/* > > + * Xen basic APIC support > > + * > > + * Copyright (c) 2012 Citrix > > + * > > + * Authors: > > + *  Wei Liu > > + * > > + * This work is licensed under the terms of the GNU GPL version 2. > > + * See the COPYING file in the top-level directory. > > + */ > > Really 2-only, not 2-or-later ? I am not a great fun of the 2-or-later clause and it doesn't look like a requirement from the QEMU project POV. However if it is, I'll change it to 2-or-later. > > +#include "hw/apic_internal.h" > > +#include "hw/msi.h" > > +#include "xen.h" > > + > > +static uint64_t xen_apic_mem_read(void *opaque, target_phys_addr_t addr, > > +                                  unsigned size) > > +{ > > +    return -1U; > > +} > > This seems a rather confusing way to write 'return 0xffffffff;' Yep, I'll change it.