Re: [PATCH v3 08/16] perf: Force architectures to opt-in to guest callbacks

[Sean Christopherson <seanjc@xxxxxxxxxx>]

On Wed, Sep 22, 2021, Paolo Bonzini wrote:
> On 22/09/21 02:05, Sean Christopherson wrote:
> > @@ -1273,6 +1274,11 @@ static inline unsigned int 
> > perf_guest_handle_intel_pt_intr(void)
> >   }
> >   extern void perf_register_guest_info_callbacks(struct 
> > perf_guest_info_callbacks *cbs);
> >   extern void perf_unregister_guest_info_callbacks(struct 
> > perf_guest_info_callbacks *cbs);
> > +#else
> > +static inline unsigned int perf_guest_state(void)           { return 0; }
> > +static inline unsigned long perf_guest_get_ip(void)                 { 
> > return 0; }
> > +static inline unsigned int perf_guest_handle_intel_pt_intr(void) { return 
> > 0; }
> > +#endif /* CONFIG_GUEST_PERF_EVENTS */
> 
> Reviewed-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
> 
> Having perf_guest_handle_intel_pt_intr in generic code is a bit off.  Of
> course it has to be in the struct, but the wrapper might be placed in
> arch/x86/include/asm/perf_event.h as well (applies to patch 7 as well).

Yeah, I went with this option purely to keep everything bundled together.  I 
have
no strong opinion.