Re: [PATCH v2 2/6] x86/APIC: drop clustered_apic_check() hook

["Roger Pau Monné" <roger.pau@citrix.com>]

On Fri, Nov 05, 2021 at 01:34:12PM +0100, Jan Beulich wrote:
> The hook functions have been empty forever (x2APIC) or issuing merely a
> printk() for a long time (xAPIC). Since that printk() is (a) generally
> useful (i.e. also in the x2APIC case) and (b) would better only be
> issued once the final APIC driver to use was determined, move (and
> generalize) it into connect_bsp_APIC().
> 
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>

> ---
> v2: New.
> 
> --- a/xen/arch/x86/acpi/boot.c
> +++ b/xen/arch/x86/acpi/boot.c
> @@ -674,9 +674,7 @@ static void __init acpi_process_madt(voi
>  			error = acpi_parse_madt_ioapic_entries();
>  			if (!error) {
>  				acpi_ioapic = true;
> -
>  				smp_found_config = true;
> -				clustered_apic_check();
>  			}
>  		}
>  		if (error == -EINVAL) {
> --- a/xen/arch/x86/apic.c
> +++ b/xen/arch/x86/apic.c
> @@ -243,6 +243,12 @@ void __init connect_bsp_APIC(void)
>          outb(0x70, 0x22);
>          outb(0x01, 0x23);
>      }
> +
> +    printk("Enabling APIC mode:  %s.  Using %d I/O APICs\n",

I don't think it makes sense to prefix APIC with 'x' or 'x2' here, as
we already print the APIC mode elsewhere?

> +           !INT_DEST_MODE ? "Physical"
> +                          : init_apic_ldr == init_apic_ldr_flat ? "Flat"
> +                                                                : "Clustered",
> +           nr_ioapics);
>      enable_apic_mode();

This also seem to be completely unneeded? I guess it would be cleaned
in a further patch.

Thanks, Roger.