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@xxxxxxxxxx> Cc: "Radim Krčmář" <rkrcmar@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxx> Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Cc: Gary Hook <gary.hook@xxxxxxx> Cc: Tom Lendacky <thomas.lendacky@xxxxxxx> Cc: linux-crypto@xxxxxxxxxxxxxxx Cc: kvm@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx> ---
Acked-by: Gary R Hook <gary.hook@xxxxxxx>
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;
