On 10.02.20 13:50, Cornelia Huck wrote: > On Mon, 10 Feb 2020 13:06:19 +0100 > Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote: > >> What about the following. I will rip out RC and RRC but add >> a 32bit flags field (which must be 0) and 3*64 bit reserved. > > Probably dumb question: How are these new fields supposed to be used? This was planned for error handling in QEMU. As we have no user of rc/rrc yet, I have ripped that out and added a flag field + 16 bytes of reserved. Usage is as usual flags must be 0. When flags!=0 the reserved fields will have a new meaning.