linux-kernel - Re: [Part2 PATCH v6.1 16/38] crypto: ccp: Implement SEV_PEK

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Date:   Tue, 24 Oct 2017 13:42:21 -0500
From:   Gary R Hook <gary.hook@....com>
To:     Brijesh Singh <brijesh.singh@....com>,
        Borislav Petkov <bp@...en8.de>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Borislav Petkov <bp@...e.de>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Tom Lendacky <thomas.lendacky@....com>,
        linux-crypto@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [Part2 PATCH v6.1 16/38] crypto: ccp: Implement SEV_PEK_GEN ioctl
 command

On 10/23/2017 04:55 PM, Brijesh Singh wrote:
> The SEV_PEK_GEN command is used to generate a new Platform Endorsement
> Key (PEK). The command is defined in SEV spec section 5.6.
> 
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: "Radim Krčmář" <rkrcmar@...hat.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: Gary Hook <gary.hook@....com>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: linux-crypto@...r.kernel.org
> Cc: kvm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>

Acked-by: Gary R Hook <gary.hook@....com>

> ---
> 
> Changes since v6:
>   * when sev_do_cmd() and sev_platform_shutdown() fails then propogate
>     the error status code from sev_do_cmd() because it can give us
>     much better reason for the failure.
> 
>   drivers/crypto/ccp/psp-dev.c | 31 +++++++++++++++++++++++++++++++
>   1 file changed, 31 insertions(+)
> 
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index dd4bab143de9..18e2d8291997 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -195,6 +195,34 @@ static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
>   	return ret;
>   }
>   
> +static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
> +{
> +	int ret, err;
> +
> +	ret = sev_platform_init(NULL, &argp->error);
> +	if (ret)
> +		return ret;
> +
> +	ret = sev_do_cmd(cmd, 0, &argp->error);
> +
> +	if (sev_platform_shutdown(&err)) {
> +		/*
> +		 * If both sev_do_cmd() and sev_platform_shutdown() commands
> +		 * failed then propogate the error code from the sev_do_cmd()
> +		 * because it contains a useful status code for the command
> +		 * failure.
> +		 */
> +		if (ret)
> +			goto done;
> +
> +		argp->error = err;
> +		ret = -EIO;
> +	}
> +
> +done:
> +	return ret;
> +}
> +
>   static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
>   {
>   	void __user *argp = (void __user *)arg;
> @@ -218,6 +246,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
>   	case SEV_PLATFORM_STATUS:
>   		ret = sev_ioctl_do_platform_status(&input);
>   		break;
> +	case SEV_PEK_GEN:
> +		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input);
> +		break;
>   	default:
>   		ret = -EINVAL;
>   		goto out;
>