On Tue, Oct 3, 2023 at 8:27 PM Dave Hansen <dave.hansen@xxxxxxxxx> wrote: > > On 10/3/23 19:44, Jim Mattson wrote: > > I'm a little surprised at the pushback, TBH. Are you implying that > > there is some advantage to *not* passing this bit through? > > I'm not really trying to push back. I'm honestly just curious. Linux > obviously doesn't cat about the bit. So is this for some future Linux > or some other OS? It's not for any particular guest OS. It's just for correctness of the virtual CPU. Pedantically, hardware that enumerates this bit cannot run a guest that doesn't. Pragmatically, it almost certainly doesn't matter. Getting it right is trivial and has no impact on performance or code size, so why not just do it?
