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Subject[Part2 PATCH v5.1 12.7/31] 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
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
drivers/crypto/ccp/psp-dev.c | 85 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 28efb7a9245a..8038ca7aef03 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -299,6 +299,87 @@ static int sev_ioctl_pdh_gen(struct sev_issue_cmd *argp)
return ret;
}

+static int sev_ioctl_pek_csr(struct sev_issue_cmd *argp)
+{
+ struct sev_user_data_pek_csr input;
+ struct sev_data_pek_csr *data;
+ int do_shutdown = 0;
+ int ret, state;
+ void *blob;
+
+ if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data,
+ sizeof(struct sev_user_data_pek_csr)))
+ return -EFAULT;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* allocate a temporary physical contigous buffer to store the CSR blob */
+ blob = NULL;
+ if (input.address) {
+ 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;
+ }
+
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ goto e_free_blob;
+
+ /*
+ * PEK_CERT command can be issued only when we are in INIT state.
+ * if current state is WORKING then reject it, if state is UNINIT
+ * then transition the platform to INIT state before issuing the
+ * command.
+ */
+ if (state == SEV_STATE_WORKING) {
+ ret = -EBUSY;
+ goto e_free_blob;
+ } else if (state == SEV_STATE_UNINIT) {
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ goto e_free_blob;
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PEK_CSR, data, &argp->error);
+
+ input.length = data->len;
+
+ /* copy blob to userspace */
+ if (blob &&
+ copy_to_user((void __user *)(uintptr_t)input.address,
+ blob, input.length)) {
+ ret = -EFAULT;
+ goto e_shutdown;
+ }
+
+ if (copy_to_user((void __user *)(uintptr_t)argp->data, &input,
+ sizeof(struct sev_user_data_pek_csr)))
+ ret = -EFAULT;
+
+e_shutdown:
+ if (do_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+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 +413,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
ret = sev_ioctl_pdh_gen(&input);
break;
}
+ case SEV_PEK_CSR: {
+ ret = sev_ioctl_pek_csr(&input);
+ break;
+ }
default:
ret = -EINVAL;
break;
--
2.9.5
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