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    Subject[Part2 PATCH v7 18/38] crypto: ccp: Implement SEV_PEK_CSR ioctl command
    Date
    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
    Improvements-by: Borislav Petkov <bp@suse.de>
    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    Acked-by: Gary R Hook <gary.hook@amd.com>
    ---
    drivers/crypto/ccp/psp-dev.c | 68 ++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 68 insertions(+)

    diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
    index 42991c2e9085..4e2f9d037f0a 100644
    --- a/drivers/crypto/ccp/psp-dev.c
    +++ b/drivers/crypto/ccp/psp-dev.c
    @@ -298,6 +298,71 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp)
    return __sev_do_cmd_locked(cmd, 0, &argp->error);
    }

    +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;
    +
    + 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:
    + if (psp_master->sev_state == SEV_STATE_UNINIT) {
    + ret = __sev_platform_init_locked(psp_master->sev_init, &argp->error);
    + if (ret)
    + goto e_free_blob;
    + }
    +
    + ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);
    +
    + /*
    + * If we query the CSR length, FW responded with expected data
    + */
    + input.length = data->len;
    +
    + 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;
    @@ -332,6 +397,9 @@ 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;
    --
    2.9.5
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