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SubjectRe: [Part2 PATCH v6.1 18/38] crypto: ccp: Implement SEV_PEK_CSR ioctl command
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On 10/23/2017 05:10 PM, Brijesh Singh wrote:
> The SEV_PEK_CSR command can be used to generate a PEK certificate
> signing request. The command is defined in SEV spec section 5.7.
>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Radim Krčmář" <rkrcmar@redhat.com>
> Cc: Borislav Petkov <bp@suse.de>
> Cc: Herbert Xu <herbert@gondor.apana.org.au>
> Cc: Gary Hook <gary.hook@amd.com>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Cc: linux-crypto@vger.kernel.org
> Cc: kvm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---


Acked-by: Gary R Hook <gary.hook@amd.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 | 81 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 81 insertions(+)
>
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index 3672435150cf..aaf1c5cf821d 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -223,6 +223,84 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
> return ret;
> }
>
> +static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp)
> +{
> + struct sev_user_data_pek_csr input;
> + struct sev_data_pek_csr *data;
> + void *blob = NULL;
> + int ret, err;
> +
> + if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
> + return -EFAULT;
> +
> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + /* userspace wants to query CSR length */
> + if (!input.address || !input.length)
> + goto cmd;
> +
> + /* allocate a physically contiguous buffer to store the CSR blob */
> + if (!access_ok(VERIFY_WRITE, input.address, input.length) ||
> + input.length > SEV_FW_BLOB_MAX_SIZE) {
> + ret = -EFAULT;
> + goto e_free;
> + }
> +
> + blob = kmalloc(input.length, GFP_KERNEL);
> + if (!blob) {
> + ret = -ENOMEM;
> + goto e_free;
> + }
> +
> + data->address = __psp_pa(blob);
> + data->len = input.length;
> +
> +cmd:
> + ret = sev_platform_init(NULL, &argp->error);
> + if (ret)
> + goto e_free_blob;
> +
> + ret = sev_do_cmd(SEV_CMD_PEK_CSR, data, &argp->error);
> +
> + /*
> + * If we query the CSR length, FW responded with expected data
> + */
> + input.length = data->len;
> +
> + 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 e_free_blob;
> +
> + ret = -EIO;
> + argp->error = err;
> + goto e_free_blob;
> + }
> +
> + if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
> + ret = -EFAULT;
> + goto e_free_blob;
> + }
> +
> + if (blob) {
> + if (copy_to_user((void __user *)input.address, blob, input.length))
> + ret = -EFAULT;
> + }
> +
> +e_free_blob:
> + kfree(blob);
> +e_free:
> + kfree(data);
> + return ret;
> +}
> +
> static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
> {
> void __user *argp = (void __user *)arg;
> @@ -252,6 +330,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
> case SEV_PDH_GEN:
> ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input);
> break;
> + case SEV_PEK_CSR:
> + ret = sev_ioctl_do_pek_csr(&input);
> + break;
> default:
> ret = -EINVAL;
> goto out;
>

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