Re: [RFC PATCH V6 04/14] x86/sev: optimize system vector processing invoked from #HV exception

[Tianyu Lan <ltykernel@xxxxxxxxx>]

On 5/16/2023 6:23 PM, Peter Zijlstra wrote:
> > -				panic("Unexpected vector %d\n", vector);
> > -				unreachable();
> > +			if (!(sysvec_table[pending_events.vector - FIRST_SYSTEM_VECTOR])) {
> > +				WARN(1, "system vector entry 0x%x is NULL\n",
> > +				     pending_events.vector);
> > +			} else {
> > +				(*sysvec_table[pending_events.vector - FIRST_SYSTEM_VECTOR])(regs);
> >   			}
> >   		} else {
> >   			common_interrupt(regs, pending_events.vector);
> But your code replace direct calls with an indirect call. Now AFAIK,
> this SNP shit came with Zen3, and Zen3 still uses retpolines for
> indirect calls.
>
> Can you connect the dots?


The title is no exact and will update in the next version. Thanks.