Re: [Xen-devel] [PATCH v2 13/13] lixl: arm: create optee firmware node in DT if tee=1

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

On 03/09/18 17:54, Volodymyr Babchuk wrote:
> If TEE support is enabled with "tee=1" option in xl.cfg,
> then we need to inform guest about available TEE.
>
> Currently only OP-TEE is supported, so we'll create DT
> node in a way that is expected by optee driver in linux.
>
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> ---
>   tools/libxl/libxl_arm.c | 29 +++++++++++++++++++++++++++++
>   1 file changed, 29 insertions(+)
>
> diff --git a/tools/libxl/libxl_arm.c b/tools/libxl/libxl_arm.c
> index 7f1d509..6376239 100644
> --- a/tools/libxl/libxl_arm.c
> +++ b/tools/libxl/libxl_arm.c
> @@ -407,6 +407,32 @@ static int make_psci_node(libxl__gc *gc, void *fdt)
>       return 0;
>   }
>   
> +static int make_optee_node(libxl__gc *gc, void *fdt)
> +{
> +    int res;
> +    LOG(DEBUG, "Creating OP-TEE node in dtb");
> +
> +    res = fdt_begin_node(fdt, "firmware");
> +    if (res) return res;
> +
> +    res = fdt_begin_node(fdt, "optee");
> +    if (res) return res;
> +
> +    res = fdt_property_compat(gc, fdt, 1, "linaro,optee-tz");
> +    if (res) return res;
> +
> +    res = fdt_property_string(fdt, "method", "smc");
We want the guest to use HVC interface not SMC.

> +    if (res) return res;
> +
> +    res = fdt_end_node(fdt);
> +    if (res) return res;
> +
> +    res = fdt_end_node(fdt);
> +    if (res) return res;
> +
> +    return 0;
> +}
> +
>   static int make_memory_nodes(libxl__gc *gc, void *fdt,
>                                const struct xc_dom_image *dom)
>   {
> @@ -920,6 +946,9 @@ next_resize:
>           if (info->arch_arm.vuart == LIBXL_VUART_TYPE_SBSA_UART)
>               FDT( make_vpl011_uart_node(gc, fdt, ainfo, dom) );
>   
> +        if (libxl_defbool_val(info->tee))
> +            FDT( make_optee_node(gc, fdt));
Space missing before the last ).

> +
>           if (pfdt)
>               FDT( copy_partial_fdt(gc, fdt, pfdt) );
>   
Cheers,

--
Julien Grall

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