Re: [PATCH 1/2] KVM: VMX: Drop obsolete branch hint prefixes from inline asm

[Sean Christopherson]

On Wed, Feb 11, 2026, Andrew Cooper wrote:
> > Remove explicit branch hint prefixes (.byte 0x2e / 0x3e) from VMX
> > inline assembly sequences.
> >
> > These prefixes (CS/DS segment overrides used as branch hints on
> > very old x86 CPUs) have been ignored by modern processors for a
> > long time. Keeping them provides no measurable benefit and only
> > enlarges the generated code.
> 
> It's actually worse than this.
> 
> The branch-taken hint has new meaning in Lion Cove cores and later,
> along with a warning saying "performance penalty for misuse".

Well that's just lovely.  Sounds like maybe this should be tagged for stable@?