Re: [PATCH v2 06/35] acpi: build_tpm2: use acpi_init_table()/acpi_table_composed() instead of build_header()

[Eric Auger]

Hi Igor,

On 7/8/21 5:45 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>
> Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric

> ---
> CC: stefanb@linux.vnet.ibm.com
> ---
>  hw/acpi/aml-build.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 176d086b25..057c64fb48 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -2103,13 +2103,14 @@ void build_tpm2(GArray *table_data, BIOSLinker 
> *linker, GArray *tcpalog,
>                  const char *oem_id, const char *oem_table_id)
>  {
>      uint8_t start_method_params[12] = {};
> -    unsigned log_addr_offset, tpm2_start;
> +    unsigned log_addr_offset;
>      uint64_t control_area_start_address;
>      TPMIf *tpmif = tpm_find();
>      uint32_t start_method;
> +    AcpiTable table = { .sig = "TPM2", .rev = 4,
> +                        .oem_id = oem_id, .oem_table_id = oem_table_id };
>  
> -    tpm2_start = table_data->len;
> -    acpi_data_push(table_data, sizeof(AcpiTableHeader));
> +    acpi_init_table(&table, table_data);
>  
>      /* Platform Class */
>      build_append_int_noprefix(table_data, TPM2_ACPI_CLASS_CLIENT, 2);
> @@ -2147,9 +2148,7 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, 
> GArray *tcpalog,
>      bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
>                                     log_addr_offset, 8,
>                                     ACPI_BUILD_TPMLOG_FILE, 0);
> -    build_header(linker, table_data,
> -                 (void *)(table_data->data + tpm2_start),
> -                 "TPM2", table_data->len - tpm2_start, 4, oem_id, 
> oem_table_id);
> +    acpi_table_composed(linker, &table);
>  }
>  #endif
>  
>