linux-kernel - Re: [PATCHv3 4/6] fpga: of-fpga-region: add authenticate-fpga-config property

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Date:   Tue, 26 Jan 2021 08:03:40 -0600
From:   Richard Gong <richard.gong@...ux.intel.com>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     trix@...hat.com, gregkh@...uxfoundation.org,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org,
        dinguyen@...nel.org, sridhar.rajagopal@...el.com,
        Richard Gong <richard.gong@...el.com>
Subject: Re: [PATCHv3 4/6] fpga: of-fpga-region: add authenticate-fpga-config
 property


Hi Moritz,

On 1/25/21 11:10 PM, Moritz Fischer wrote:
> On Mon, Jan 25, 2021 at 02:56:26PM -0600, richard.gong@...ux.intel.com wrote:
>> From: Richard Gong <richard.gong@...el.com>
>>
>> Add authenticate-fpga-config property to support FPGA bitstream
>> authentication, which makes sure a signed bitstream has valid signatures.
>>
>> Signed-off-by: Richard Gong <richard.gong@...el.com>
>> ---
>> v3: no change
>> v2: changed in alphabetical order
>> ---
>>   drivers/fpga/of-fpga-region.c | 3 +++
>>   1 file changed, 3 insertions(+)
>>
>> diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
>> index e405309..3840883 100644
>> --- a/drivers/fpga/of-fpga-region.c
>> +++ b/drivers/fpga/of-fpga-region.c
>> @@ -219,6 +219,9 @@ static struct fpga_image_info *of_fpga_region_parse_ov(
>>   	info->overlay = overlay;
>>   
>>   	/* Read FPGA region properties from the overlay */
>> +	if (of_property_read_bool(overlay, "authenticate-fpga-config"))
>> +		info->flags |= FPGA_MGR_BITSTREM_AUTHENTICATION;
>> +
> Should you check here that no new nodes are being added as you *only*
> authenticate?

Sure, I will add additional checks in next submission.

> 
>>   	if (of_property_read_bool(overlay, "partial-fpga-config"))
>>   		info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
>>   
>> -- 
>> 2.7.4
>>
> 
> Thanks,
> Moritz
> 
Regards,
Richard