Re: [Qemu-devel] [PATCH v4 4/5] target-i386: Move APIC ID compatibility code to pc.c

["Andreas Färber" <afaerber@suse.de>]

Am 04.03.2015 um 03:13 schrieb Eduardo Habkost:
> The APIC ID compatibility code is required only for PC, and now that
> x86_cpu_initfn() doesn't use x86_cpu_apic_id_from_index() anymore, that
> code can be moved to pc.c.
> 
> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
> Reviewed-by: Andreas Färber <afaerber@suse.de>
> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
> ---
>  hw/i386/pc.c      | 35 +++++++++++++++++++++++++++++++++++
>  target-i386/cpu.c | 34 ----------------------------------
>  2 files changed, 35 insertions(+), 34 deletions(-)
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index b229856..8c3c470 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -25,6 +25,8 @@
>  #include "hw/i386/pc.h"
>  #include "hw/char/serial.h"
>  #include "hw/i386/apic.h"
> +#include "hw/i386/topology.h"
> +#include "sysemu/cpus.h"
>  #include "hw/block/fdc.h"
>  #include "hw/ide.h"
>  #include "hw/pci/pci.h"
> @@ -629,6 +631,39 @@ bool e820_get_entry(int idx, uint32_t type, uint64_t *address, uint64_t *length)
>      return false;
>  }
>  
> +/* Enables contiguous-apic-ID mode, for compatibility */
> +static bool compat_apic_id_mode;
> +
> +void enable_compat_apic_id_mode(void)
> +{
> +    compat_apic_id_mode = true;
> +}
> +
> +/* Calculates initial APIC ID for a specific CPU index
> + *
> + * Currently we need to be able to calculate the APIC ID from the CPU index
> + * alone (without requiring a CPU object), as the QEMU<->Seabios interfaces have
> + * no concept of "CPU index", and the NUMA tables on fw_cfg need the APIC ID of
> + * all CPUs up to max_cpus.
> + */
> +uint32_t x86_cpu_apic_id_from_index(unsigned int cpu_index)

Looking a bit closer here, as I am poking around its call site for the
socket modeling, can't this be made static while at it? (If so, don't
forget to drop the prototype.)

Regards,
Andreas

> +{
> +    uint32_t correct_id;
> +    static bool warned;
> +
> +    correct_id = x86_apicid_from_cpu_idx(smp_cores, smp_threads, cpu_index);
> +    if (compat_apic_id_mode) {
> +        if (cpu_index != correct_id && !warned) {
> +            error_report("APIC IDs set in compatibility mode, "
> +                         "CPU topology won't match the configuration");
> +            warned = true;
> +        }
> +        return cpu_index;
> +    } else {
> +        return correct_id;
> +    }
> +}
> +
>  /* Calculates the limit to CPU APIC ID values
>   *
>   * This function returns the limit for the APIC ID value, so that all
[snip]

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