HYPERCALL_POSTMSGIN_SIZE
CTASSERT(sizeof(struct hypercall_postmsg_in) == HYPERCALL_POSTMSGIN_SIZE);
HYPERCALL_POSTMSGIN_ALIGN, 0, HYPERCALL_POSTMSGIN_SIZE,
memset(inprm, 0, HYPERCALL_POSTMSGIN_SIZE);
memcpy(&mh->mh_inprm_save, mh->mh_inprm, HYPERCALL_POSTMSGIN_SIZE);
HYPERCALL_POSTMSGIN_SIZE);