Re: [Qemu-devel] [PATCH for-2.2] pc: acpi: mark all possible CPUs as enabled in SRAT

[Paolo Bonzini <pbonzini@redhat.com>]

On 10/11/2014 17:20, Igor Mammedov wrote:
> If QEMU is started with  -numa ... Windows only notices that
> CPU has been hot-added but it will not online such CPUs.
> 
> It's caused by the fact that possible CPUs are flagged as
> not enabled in SRAT and Windows honoring that information
> doesn't use corresponding CPU.
> 
> ACPI 5.0 Spec regarding to flag says:
> "
> Table 5-47 Local APIC Flags
> ...
> Enabled: if zero, this processor is unusable, and the operating system
> support will not attempt to use it.
> "
> 
> Fix QEMU to adhere to spec and mark possible CPUs as enabled
> in SRAT.
> 
> With that Windows onlines hot-added CPUs as expected.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>

Does this need to be specific to pc-2.2?

Paolo

> ---
>  hw/i386/acpi-build.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 4003b6b..06499da 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -1269,8 +1269,7 @@ acpi_build_srat_memory(AcpiSratMemoryAffinity *numamem, uint64_t base,
>  }
>  
>  static void
> -build_srat(GArray *table_data, GArray *linker,
> -           AcpiCpuInfo *cpu, PcGuestInfo *guest_info)
> +build_srat(GArray *table_data, GArray *linker, PcGuestInfo *guest_info)
>  {
>      AcpiSystemResourceAffinityTable *srat;
>      AcpiSratProcessorAffinity *core;
> @@ -1300,11 +1299,7 @@ build_srat(GArray *table_data, GArray *linker,
>          core->proximity_lo = curnode;
>          memset(core->proximity_hi, 0, 3);
>          core->local_sapic_eid = 0;
> -        if (test_bit(i, cpu->found_cpus)) {
> -            core->flags = cpu_to_le32(1);
> -        } else {
> -            core->flags = cpu_to_le32(0);
> -        }
> +        core->flags = cpu_to_le32(1);
>      }
>  
>  
> @@ -1622,7 +1617,7 @@ void acpi_build(PcGuestInfo *guest_info, AcpiBuildTables *tables)
>      }
>      if (guest_info->numa_nodes) {
>          acpi_add_table(table_offsets, tables->table_data);
> -        build_srat(tables->table_data, tables->linker, &cpu, guest_info);
> +        build_srat(tables->table_data, tables->linker, guest_info);
>      }
>      if (acpi_get_mcfg(&mcfg)) {
>          acpi_add_table(table_offsets, tables->table_data);
>