On November 13, 2023 1:29:47 PM EST, Borislav Petkov <bp@xxxxxxxxx> wrote: >On Mon, Nov 13, 2023 at 12:36:04PM -0500, H. Peter Anvin wrote: >> A resource cannot be consumed after the value has been written; this >> is the only necessary level of serialization, equivalent to, say, RAX. > >Lemme see if I understand this correctly using this context as an >example: after this MSR_IA32_FRED_RSP0 write, any FRED events determined >to be delivered to level 0 will use this new task stack ptr? > >And since the new task is not running yet and the old one isn't running >either, we're fine here. So the "serialization point" I was talking >about above is bollocks. > >Close? :) > >> A serializing instruction stops the entire pipeline until everything >> has retired and any stores have become globally visible. > >Right, we don't need that here. > >Thx. > Yep!
