Re: [Qemu-devel] [PATCH v4 06/10] pc: acpi: create MADT.lapic entries only for valid lapics

[Marcel Apfelbaum <marcel.apfelbaum@gmail.com>]

On 02/26/2016 03:59 PM, Igor Mammedov wrote:
> do not assume that all lapics in range 0..apic_id_limit
> are valid and do not create lapic entries for not
> possible lapics in MADT.
>
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
>   hw/i386/acpi-build.c | 19 ++++++++++++-------
>   1 file changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 54d2f92..c06f3f5 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -362,9 +362,10 @@ build_fadt(GArray *table_data, GArray *linker, AcpiPmInfo *pm,
>   }
>
>   static void
> -build_madt(GArray *table_data, GArray *linker, PCMachineState *pcms,
> -           AcpiCpuInfo *cpu)
> +build_madt(GArray *table_data, GArray *linker, PCMachineState *pcms)
>   {
> +    MachineClass *mc = MACHINE_GET_CLASS(pcms);
> +    CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(MACHINE(pcms));
>       int madt_start = table_data->len;
>
>       AcpiMultipleApicTable *madt;
> @@ -377,18 +378,22 @@ build_madt(GArray *table_data, GArray *linker, PCMachineState *pcms,
>       madt->local_apic_address = cpu_to_le32(APIC_DEFAULT_ADDRESS);
>       madt->flags = cpu_to_le32(1);
>
> -    for (i = 0; i < pcms->apic_id_limit; i++) {
> +    for (i = 0; i < apic_ids->len; i++) {
>           AcpiMadtProcessorApic *apic = acpi_data_push(table_data, sizeof *apic);
> +        int apic_id = apic_ids->cpus[i].arch_id;
> +
>           apic->type = ACPI_APIC_PROCESSOR;
>           apic->length = sizeof(*apic);
> -        apic->processor_id = i;
> -        apic->local_apic_id = i;
> -        if (test_bit(i, cpu->found_cpus)) {
> +        apic->processor_id = apic_id;
> +        apic->local_apic_id = apic_id;
> +        if (apic_ids->cpus[i].cpu != NULL) {
>               apic->flags = cpu_to_le32(1);
>           } else {
>               apic->flags = cpu_to_le32(0);
>           }
>       }
> +    g_free(apic_ids);
> +
>       io_apic = acpi_data_push(table_data, sizeof *io_apic);
>       io_apic->type = ACPI_APIC_IO;
>       io_apic->length = sizeof(*io_apic);
> @@ -2648,7 +2653,7 @@ void acpi_build(AcpiBuildTables *tables, MachineState *machine)
>       aml_len += tables_blob->len - fadt;
>
>       acpi_add_table(table_offsets, tables_blob);
> -    build_madt(tables_blob, tables->linker, pcms, &cpu);
> +    build_madt(tables_blob, tables->linker, pcms);
>
>       if (misc.has_hpet) {
>           acpi_add_table(table_offsets, tables_blob);
>

Looks OK to me.

Reviewed-by: Marcel Apfelbaum <marcel@redhat.com>

Thanks,
Marcel