linux-kernel - Re: [PATCH 4/5] crypto: ccp: Add support for getting security attributes on some older systems

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Date: Tue, 28 May 2024 10:28:11 -0500
From: Tom Lendacky <thomas.lendacky@....com>
To: Mario Limonciello <mario.limonciello@....com>,
 Herbert Xu <herbert@...dor.apana.org.au>
Cc: "open list:AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - DB..."
 <linux-crypto@...r.kernel.org>, Richard Hughes <hughsient@...il.com>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] crypto: ccp: Add support for getting security
 attributes on some older systems

On 5/27/24 10:26, Mario Limonciello wrote:
> Older systems will not populate the security attributes in the
> capabilities register. The PSP on these systems, however, does have a
> command to get the security attributes. Use this command during ccp
> startup to populate the attributes if they're missing.
> 
> Closes: https://github.com/fwupd/fwupd/issues/5284
> Closes: https://github.com/fwupd/fwupd/issues/5675
> Closes: https://github.com/fwupd/fwupd/issues/6253
> Closes: https://github.com/fwupd/fwupd/issues/7280
> Closes: https://github.com/fwupd/fwupd/issues/6323
> Closes: https://github.com/fwupd/fwupd/discussions/5433
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
>   drivers/crypto/ccp/hsti.c           | 63 +++++++++++++++++++++++++++++
>   drivers/crypto/ccp/hsti.h           |  2 +
>   drivers/crypto/ccp/psp-dev.c        |  5 +++
>   drivers/crypto/ccp/psp-dev.h        |  2 -
>   drivers/crypto/ccp/sp-dev.h         |  1 +
>   drivers/crypto/ccp/sp-pci.c         |  5 ++-
>   include/linux/psp-platform-access.h |  1 +
>   7 files changed, 76 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/crypto/ccp/hsti.c b/drivers/crypto/ccp/hsti.c
> index 076c1d175b2b..8f583902d786 100644
> --- a/drivers/crypto/ccp/hsti.c
> +++ b/drivers/crypto/ccp/hsti.c

> +int psp_init_hsti(struct psp_device *psp)
> +{
> +	int ret;
> +
> +	if (PSP_FEATURE(psp, HSTI)) {
> +		ret = psp_poulate_hsti(psp);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	/*
> +	 * At this stage, if security information hasn't been populated by
> +	 * either the PSP or by the driver through the platform command,
> +	 * then there is nothing more to do.
> +	 */
> +	if (!psp->capability.security_reporting)
> +		return 0;

This should really be part of patch #5, since it doesn't make a lot of 
sense at this stage.

Thanks,
Tom

> +
> +	return 0;
> +}