linux-kernel - Re: [PATCH 1/2] fpga: mgr: Adds secure BitStream loading support

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Message-ID: <YApf1jlEghbnDFo/@archbook>
Date:   Thu, 21 Jan 2021 21:17:10 -0800
From:   Moritz Fischer <mdf@...nel.org>
To:     Nava kishore Manne <nava.manne@...inx.com>
Cc:     mdf@...nel.org, trix@...hat.com, robh+dt@...nel.org,
        michal.simek@...inx.com, linux-fpga@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, git@...inx.com,
        chinnikishore369@...il.com
Subject: Re: [PATCH 1/2] fpga: mgr: Adds secure BitStream loading support

On Mon, Jan 18, 2021 at 08:20:57AM +0530, Nava kishore Manne wrote:
> This commit adds secure flags to the framework to support
> secure BitStream Loading.
> 
> Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> ---
>  drivers/fpga/of-fpga-region.c | 10 ++++++++++
>  include/linux/fpga/fpga-mgr.h | 12 ++++++++++++
>  2 files changed, 22 insertions(+)
> 
> diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
> index e405309baadc..3a5eb4808888 100644
> --- a/drivers/fpga/of-fpga-region.c
> +++ b/drivers/fpga/of-fpga-region.c
> @@ -228,6 +228,16 @@ static struct fpga_image_info *of_fpga_region_parse_ov(
>  	if (of_property_read_bool(overlay, "encrypted-fpga-config"))
>  		info->flags |= FPGA_MGR_ENCRYPTED_BITSTREAM;
>  
> +	if (of_property_read_bool(overlay, "userkey-encrypted-fpga-config"))
> +		info->flags |= FPGA_MGR_USERKEY_ENCRYPTED_BITSTREAM;

Can this just be encrypted-fpga-config/FPGA_MGR_ENCRYPTED?
> +
> +	if (of_property_read_bool(overlay, "ddrmem-authenticated-fpga-config"))
> +		info->flags |= FPGA_MGR_DDR_MEM_AUTH_BITSTREAM;
> +
> +	if (of_property_read_bool(overlay,
> +				  "securemem-authenticated-fpga-config"))
> +		info->flags |= FPGA_MGR_SECURE_MEM_AUTH_BITSTREAM;
> +
>  	if (!of_property_read_string(overlay, "firmware-name",
>  				     &firmware_name)) {
>  		info->firmware_name = devm_kstrdup(dev, firmware_name,
> diff --git a/include/linux/fpga/fpga-mgr.h b/include/linux/fpga/fpga-mgr.h
> index 2bc3030a69e5..2f7455a60666 100644
> --- a/include/linux/fpga/fpga-mgr.h
> +++ b/include/linux/fpga/fpga-mgr.h
> @@ -67,12 +67,24 @@ enum fpga_mgr_states {
>   * %FPGA_MGR_BITSTREAM_LSB_FIRST: SPI bitstream bit order is LSB first
>   *
>   * %FPGA_MGR_COMPRESSED_BITSTREAM: FPGA bitstream is compressed
> + *
> + * %FPGA_MGR_USERKEY_ENCRYPTED_BITSTREAM: indicates bitstream is encrypted with
> + *                                        user key
> + *
> + * %FPGA_MGR_DDR_MEM_AUTH_BITSTREAM: do bitstream authentication using DDR
> + *                                   memory if supported
> + *
> + * %FPGA_MGR_SECURE_MEM_AUTH_BITSTREAM: do bitstream authentication using secure
> + *                                      memory if supported
>   */
>  #define FPGA_MGR_PARTIAL_RECONFIG	BIT(0)
>  #define FPGA_MGR_EXTERNAL_CONFIG	BIT(1)
>  #define FPGA_MGR_ENCRYPTED_BITSTREAM	BIT(2)
>  #define FPGA_MGR_BITSTREAM_LSB_FIRST	BIT(3)
>  #define FPGA_MGR_COMPRESSED_BITSTREAM	BIT(4)
> +#define FPGA_MGR_USERKEY_ENCRYPTED_BITSTREAM	BIT(5)
> +#define FPGA_MGR_DDR_MEM_AUTH_BITSTREAM		BIT(6)
> +#define FPGA_MGR_SECURE_MEM_AUTH_BITSTREAM	BIT(7)
>  
>  /**
>   * struct fpga_image_info - information specific to a FPGA image
> -- 
> 2.18.0
> 

Thanks,
Moritz