Re: [PATCH 2/2] x86/tboot: simplify DMAR table copying

[Andrew Cooper <andrew.cooper3@citrix.com>]

On 18/02/15 09:03, Jan Beulich wrote:
> There's no need for more than one variable, no need for casts, and no
> point in using the type-safe xmalloc_array() here.
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>

Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>

>
> --- a/xen/arch/x86/tboot.c
> +++ b/xen/arch/x86/tboot.c
> @@ -435,13 +435,12 @@ int __init tboot_protect_mem_regions(voi
>  
>  int __init tboot_parse_dmar_table(acpi_table_handler dmar_handler)
>  {
> -    struct acpi_table_header *dmar_table;
>      int rc;
>      uint64_t size;
>      uint32_t dmar_table_length;
>      unsigned long pa;
>      sinit_mle_data_t sinit_mle_data;
> -    unsigned char *dmar_table_raw;
> +    void *dmar_table;
>  
>      if ( !tboot_in_measured_env() )
>          return acpi_table_parse(ACPI_SIG_DMAR, dmar_handler);
> @@ -474,13 +473,12 @@ int __init tboot_parse_dmar_table(acpi_t
>      tboot_copy_memory((unsigned char *)&dmar_table_length,
>                        sizeof(dmar_table_length),
>                        pa + sizeof(char) * ACPI_NAME_SIZE);
> -    dmar_table_raw = xmalloc_array(unsigned char, dmar_table_length);
> -    tboot_copy_memory(dmar_table_raw, dmar_table_length, pa);
> -    dmar_table = (struct acpi_table_header *)dmar_table_raw;
> +    dmar_table = xmalloc_bytes(dmar_table_length);
> +    tboot_copy_memory(dmar_table, dmar_table_length, pa);
>      __set_fixmap(FIX_TBOOT_MAP_ADDRESS, 0, 0);
>  
>      rc = dmar_handler(dmar_table);
> -    xfree(dmar_table_raw);
> +    xfree(dmar_table);
>  
>      /* acpi_parse_dmar() zaps APCI DMAR signature in TXT heap table */
>      /* but dom0 will read real table, so must zap it there too */
>
>
>