On Fri, Jul 15, 2022, Yang, Weijiang wrote: > > On 7/15/2022 3:36 AM, Sean Christopherson wrote: > > It's definitely uncommon; unless I'm forgetting features, LA57 is the only feature > > that KVM fully virtualizes (as opposed to emulates in software) without requiring > > host enablement. Ah, and good ol' MPX, which is probably the best prior are since > > it shares the same XSAVE+VMCS for user+supervisor state management. So more than > > one, but still not very many. > > Speaking of MPX, is it really active in recent kernel? I can find little > piece of code at native side, instead, more code in KVM. Nope, native MPX support was ripped out a year or two ago. The kernel provides just enough save+restore support so that KVM can continue to virtualize MPX.
