Archipelago » qemu

        /* XXX bad kernel interface alert

         * For dirty bitmap, kernel allocates array of size aligned to

         * bits-per-long.  But for case when the kernel is 64bits and

         * the userspace is 32bits, userspace can't align to the same

         * bits-per-long, since sizeof(long) is different between kernel

         * and user space.  This way, userspace will provide buffer which

         * may be 4 bytes less than the kernel will use, resulting in

         * userspace memory corruption (which is not detectable by valgrind

         * too, in most cases).

         * So for now, let's align to 64 instead of HOST_LONG_BITS here, in

         * a hope that sizeof(long) wont become >8 any time soon.

         */

        size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),

                     /*HOST_LONG_BITS*/ 64) / 8;