Re: [PATCH v3 20/35] acpi: build_amd_iommu: use acpi_table_begin()/acpi_table_end() instead of build_header()

[Eric Auger]

On 9/7/21 4:47 PM, Igor Mammedov wrote:
> it replaces error-prone pointer arithmetic for build_header() API,
> with 2 calls to start and finish table creation,
> which hides offsets magic from API user.
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
> v3:
>   * s/acpi_init_table|acpi_table_composed/acpi_table_begin|acpi_table_end/
> 
> CC: marcel.apfelbaum@gmail.com
> ---
>  hw/i386/acpi-build.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
> index 45724469b0..9f888d5a2c 100644
> --- a/hw/i386/acpi-build.c
> +++ b/hw/i386/acpi-build.c
> @@ -2319,12 +2319,12 @@ build_amd_iommu(GArray *table_data, BIOSLinker 
> *linker, const char *oem_id,
>                  const char *oem_table_id)
>  {
>      int ivhd_table_len = 24;
> -    int iommu_start = table_data->len;
>      AMDVIState *s = AMD_IOMMU_DEVICE(x86_iommu_get_default());
>      GArray *ivhd_blob = g_array_new(false, true, 1);
> +    AcpiTable table = { .sig = "IVRS", .rev = 1, .oem_id = oem_id,
> +                        .oem_table_id = oem_table_id };
>  
> -    /* IVRS header */
> -    acpi_data_push(table_data, sizeof(AcpiTableHeader));
> +    acpi_table_begin(&table, table_data);
>      /* IVinfo - IO virtualization information common to all
>       * IOMMU units in a system
>       */
> @@ -2409,10 +2409,7 @@ build_amd_iommu(GArray *table_data, BIOSLinker 
> *linker, const char *oem_id,
>                                   0x48,                      /* special 
> device */
>                                   8);
>      }
> -
> -    build_header(linker, table_data, (void *)(table_data->data + 
> iommu_start),
> -                 "IVRS", table_data->len - iommu_start, 1, oem_id,
> -                 oem_table_id);
> +    acpi_table_end(linker, &table);
>  }
>  
>  typedef
> 
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric