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From:   Michael Roth <michael.roth@amd.com>
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Subject: [PATCH RFC v8 22/56] crypto:ccp: Provide API to issue SEV and SNP commands
Date:   Mon, 20 Feb 2023 12:38:13 -0600
Message-ID: <20230220183847.59159-23-michael.roth@amd.com>
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From: Brijesh Singh <brijesh.singh@amd.com>

Make sev_do_cmd() a generic API interface for the hypervisor
to issue commands to manage an SEV and SNP guest. The commands
for SEV and SNP are defined in the SEV and SEV-SNP firmware
specifications.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
---
 drivers/crypto/ccp/sev-dev.c |  3 ++-
 include/linux/psp-sev.h      | 17 +++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index af20420bd6c2..35f605936f1b 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -415,7 +415,7 @@ static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
 	return ret;
 }
 
-static int sev_do_cmd(int cmd, void *data, int *psp_ret)
+int sev_do_cmd(int cmd, void *data, int *psp_ret)
 {
 	int rc;
 
@@ -425,6 +425,7 @@ static int sev_do_cmd(int cmd, void *data, int *psp_ret)
 
 	return rc;
 }
+EXPORT_SYMBOL_GPL(sev_do_cmd);
 
 static int __sev_init_locked(int *error)
 {
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index 8cfe92e82743..46f61e3ae33b 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -907,6 +907,20 @@ int sev_guest_df_flush(int *error);
  */
 int sev_guest_decommission(struct sev_data_decommission *data, int *error);
 
+/**
+ * sev_do_cmd - perform SEV command
+ *
+ * @error: SEV command return code
+ *
+ * Returns:
+ * 0 if the SEV successfully processed the command
+ * -%ENODEV    if the SEV device is not available
+ * -%ENOTSUPP  if the SEV does not support SEV
+ * -%ETIMEDOUT if the SEV command timed out
+ * -%EIO       if the SEV returned a non-zero return code
+ */
+int sev_do_cmd(int cmd, void *data, int *psp_ret);
+
 void *psp_copy_user_blob(u64 uaddr, u32 len);
 
 #else	/* !CONFIG_CRYPTO_DEV_SP_PSP */
@@ -924,6 +938,9 @@ sev_guest_deactivate(struct sev_data_deactivate *data, int *error) { return -ENO
 static inline int
 sev_guest_decommission(struct sev_data_decommission *data, int *error) { return -ENODEV; }
 
+static inline int
+sev_do_cmd(int cmd, void *data, int *psp_ret) { return -ENODEV; }
+
 static inline int
 sev_guest_activate(struct sev_data_activate *data, int *error) { return -ENODEV; }
 
-- 
2.25.1