On Fri, Nov 11, 2022 at 01:04:27PM +0100, Paolo Bonzini wrote: > On 11/11/22 10:15, Peter Zijlstra wrote: > > I don't speak virt (but this all sounds disguisting) > > Yes, it is. AMD does not need this, they just hold onto the interrupt > until the host has issued both STGI (for NMIs) and STI (for IRQs). Right -- Cooper just explained that to me. > On Intel you can optionally make it hold onto IRQs, but NMIs are always > eaten by the VMEXIT and have to be reinjected manually. That 'optionally' thing worries me -- as in, KVM is currently opting-out? Since much of this is about preparing for FRED, can we pretty *PLEASE* fix this VMX NMI hole instead so that all this nonsense isn't needed anymore, please, really please? Have FRED imply a GI flag for VMX or something and then we can all forget about these reinjection horrors.
