On Fri, Sep 22, 2023 at 12:40 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > On Fri, Sep 22, 2023, Jim Mattson wrote: > > Okay. What about the IA32_MISC_ENABLE bits above? > > One of the exceptions where I don't see a better option, and hopefully something > that Intel won't repeat in the future. Though I'm not exactly brimming with > confidence that Intel won't retroactively add more "gotcha! unsupported!" bits > in the future when they realize they forgot add a useful CPUID feature bit. I don't understand the difference here. Why not make userspace responsible for setting these bits as well?