On Thu, May 01, 2025 at 08:33:57PM +0200, Paolo Bonzini wrote: > On Wed, Apr 30, 2025 at 1:26 PM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote: > > Notably the KVM fastop emulation stuff -- which I've completely rewritten for > > this version -- the generated code doesn't look horrific, but is slightly more > > verbose. I'm running on the assumption that instruction emulation is not super > > performance critical these days of zero VM-exit VMs etc. > > It's definitely going to be slower, but I guess it's okay these days. Yeah, it adds a bunch of branches at the very least. But that was indeed the argument, we shouldn't care much these days. > It's really only somewhat hot with really old processors > (pre-Westmere) and only when running big real mode code. Right, really old stuff :-)
