Re: [PATCH v9 2/7] x86/hygon: Map CPU NodeIds to DF nodes

[Lin Wang]

Hi Boris,

On 11/13/2026 12:43 PM, Borislav Petkov wrote:
> On Thu, Oct 29, 2026 at 01:33:08PM +0800, Lin Wang wrote:
> > +static int __maybe_unused cpu_to_df_node(unsigned int cpu)
> > +{
> > +	if (cpu >= nr_cpu_ids)
> That cpu and nr_cpu_ids mean nothing in a guest so I'm thinking you wanna test
> hypervisor first...
>
> > +		return -EINVAL;
> > +
> > +	/*
> > +	 * The NodeId reported by CPUID in a guest may not describe the
> > +	 * physical DF topology.
> > +	 */
> > +	if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
					    ^^^^^^^^^^^^
I'll move the hypervisor check before the CPU index check.

Thanks,

Lin