read_guest_memory
ret = read_guest_memory(mach, vcpu, gva, inst_bytes, fetchsize);
ret = read_guest_memory(mach, vcpu, gva, exit->u.mem.inst_bytes,
ret = read_guest_memory(mach, vcpu, gva, data, size);
ret = read_guest_memory(mach, vcpu, gva, data1, size);
ret = read_guest_memory(mach, vcpu, gva, data2, size);
ret = read_guest_memory(mach, vcpu, gva + size,
ret = read_guest_memory(mach, vcpu, gva, iobuf, iosize);
ret = read_guest_memory(mach, vcpu, gva, io.data,