crypto: ccp - introduce SEV_GET_ID2 command

The current definition and implementation of the SEV_GET_ID command
does not provide the length of the unique ID returned by the firmware.
As per the firmware specification, the firmware may return an ID
length that is not restricted to 64 bytes as assumed by the SEV_GET_ID
command.

Introduce the SEV_GET_ID2 command to overcome with the SEV_GET_ID
limitations. Deprecate the SEV_GET_ID in the favor of SEV_GET_ID2.

At the same time update SEV API web link.

Cc: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Nathaniel McCallum <npmccallum@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index fadf859a14b8c4f3180502051e83bcf718200ae1..80a59be9c80dfebdaf6a92704f7fbbb78b12722d 100644 (file)
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -583,6 +583,69 @@ e_free:
        return ret;
 }
 
+static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
+{
+       struct sev_user_data_get_id2 input;
+       struct sev_data_get_id *data;
+       void *id_blob = NULL;
+       int ret;
+
+       /* SEV GET_ID is available from SEV API v0.16 and up */
+       if (!SEV_VERSION_GREATER_OR_EQUAL(0, 16))
+               return -ENOTSUPP;
+
+       if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
+               return -EFAULT;
+
+       /* Check if we have write access to the userspace buffer */
+       if (input.address &&
+           input.length &&
+           !access_ok(input.address, input.length))
+               return -EFAULT;
+
+       data = kzalloc(sizeof(*data), GFP_KERNEL);
+       if (!data)
+               return -ENOMEM;
+
+       if (input.address && input.length) {
+               id_blob = kmalloc(input.length, GFP_KERNEL);
+               if (!id_blob) {
+                       kfree(data);
+                       return -ENOMEM;
+               }
+
+               data->address = __psp_pa(id_blob);
+               data->len = input.length;
+       }
+
+       ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
+
+       /*
+        * Firmware will return the length of the ID value (either the minimum
+        * required length or the actual length written), return it to the user.
+        */
+       input.length = data->len;
+
+       if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
+               ret = -EFAULT;
+               goto e_free;
+       }
+
+       if (id_blob) {
+               if (copy_to_user((void __user *)input.address,
+                                id_blob, data->len)) {
+                       ret = -EFAULT;
+                       goto e_free;
+               }
+       }
+
+e_free:
+       kfree(id_blob);
+       kfree(data);
+
+       return ret;
+}
+
 static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
 {
        struct sev_data_get_id *data;
@@ -761,8 +824,12 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
                ret = sev_ioctl_do_pdh_export(&input);
                break;
        case SEV_GET_ID:
+               pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
                ret = sev_ioctl_do_get_id(&input);
                break;
+       case SEV_GET_ID2:
+               ret = sev_ioctl_do_get_id2(&input);
+               break;
        default:
                ret = -EINVAL;
                goto out;

diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index 827c601841c433ba93a88e0c9c5bf0ed48874aa6..6f89fc8d4b8ea362654b7d4e42effe0fe0389c5a 100644 (file)
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -5,8 +5,7 @@
  *
  * Author: Brijesh Singh <brijesh.singh@amd.com>
  *
- * SEV spec 0.14 is available at:
- * http://support.amd.com/TechDocs/55766_SEV-KM API_Specification.pdf
+ * SEV API spec is available at https://developer.amd.com/sev
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as

diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h
index ac8c60bcc83bb797e99d44ef58c585358c4db3e5..43521d500c2bc88b86dfc7760007dea731e96a95 100644 (file)
--- a/include/uapi/linux/psp-sev.h
+++ b/include/uapi/linux/psp-sev.h
@@ -6,8 +6,7 @@
  *
  * Author: Brijesh Singh <brijesh.singh@amd.com>
  *
- * SEV spec 0.14 is available at:
- * http://support.amd.com/TechDocs/55766_SEV-KM%20API_Specification.pdf
+ * SEV API specification is available at: https://developer.amd.com/sev/
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -30,7 +29,8 @@ enum {
        SEV_PDH_GEN,
        SEV_PDH_CERT_EXPORT,
        SEV_PEK_CERT_IMPORT,
-       SEV_GET_ID,
+       SEV_GET_ID,     /* This command is deprecated, use SEV_GET_ID2 */
+       SEV_GET_ID2,
 
        SEV_MAX,
 };
@@ -125,7 +125,7 @@ struct sev_user_data_pdh_cert_export {
 } __packed;
 
 /**
- * struct sev_user_data_get_id - GET_ID command parameters
+ * struct sev_user_data_get_id - GET_ID command parameters (deprecated)
  *
  * @socket1: Buffer to pass unique ID of first socket
  * @socket2: Buffer to pass unique ID of second socket
@@ -135,6 +135,16 @@ struct sev_user_data_get_id {
        __u8 socket2[64];                       /* Out */
 } __packed;
 
+/**
+ * struct sev_user_data_get_id2 - GET_ID command parameters
+ * @address: Buffer to store unique ID
+ * @length: length of the unique ID
+ */
+struct sev_user_data_get_id2 {
+       __u64 address;                          /* In */
+       __u32 length;                           /* In/Out */
+} __packed;
+
 /**
  * struct sev_issue_cmd - SEV ioctl parameters
  *