crypto: ccp - Initialize PSP when reading psp data file failed

Currently the OS fails the PSP initialization when the file specified at
'init_ex_path' does not exist or has invalid content. However the SEV
spec just requires users to allocate 32KB of 0xFF in the file, which can
be taken care of by the OS easily.

To improve the robustness during the PSP init, leverage the retry
mechanism and continue the init process:

Before the first INIT_EX call, if the content is invalid or missing,
continue the process by feeding those contents into PSP instead of
aborting. PSP will then override it with 32KB 0xFF and return
SEV_RET_SECURE_DATA_INVALID status code. In the second INIT_EX call,
this 32KB 0xFF content will then be fed and PSP will write the valid
data to the file.

In order to do this, sev_read_init_ex_file should only be called once
for the first INIT_EX call. Calling it again for the second INIT_EX call
will cause the invalid file content overwriting the valid 32KB 0xFF data
provided by PSP in the first INIT_EX call.

Co-developed-by: Peter Gonda <pgonda@google.com>
Signed-off-by: Peter Gonda <pgonda@google.com>
Signed-off-by: Jacky Li <jackyli@google.com>
Reported-by: Alper Gun <alpergun@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 22 insertions, 14 deletions

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index b292641c8a99..8512101f0bdf 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -211,18 +211,24 @@ static int sev_read_init_ex_file(void)
 	if (IS_ERR(fp)) {
 		int ret = PTR_ERR(fp);
 
-		dev_err(sev->dev,
-			"SEV: could not open %s for read, error %d\n",
-			init_ex_path, ret);
+		if (ret == -ENOENT) {
+			dev_info(sev->dev,
+				"SEV: %s does not exist and will be created later.\n",
+				init_ex_path);
+			ret = 0;
+		} else {
+			dev_err(sev->dev,
+				"SEV: could not open %s for read, error %d\n",
+				init_ex_path, ret);
+		}
 		return ret;
 	}
 
 	nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL);
 	if (nread != NV_LENGTH) {
-		dev_err(sev->dev,
-			"SEV: failed to read %u bytes to non volatile memory area, ret %ld\n",
+		dev_info(sev->dev,
+			"SEV: could not read %u bytes to non volatile memory area, ret %ld\n",
 			NV_LENGTH, nread);
-		return -EIO;
 	}
 
 	dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread);
@@ -410,17 +416,12 @@ static int __sev_init_locked(int *error)
 static int __sev_init_ex_locked(int *error)
 {
 	struct sev_data_init_ex data;
-	int ret;
 
 	memset(&data, 0, sizeof(data));
 	data.length = sizeof(data);
 	data.nv_address = __psp_pa(sev_init_ex_buffer);
 	data.nv_len = NV_LENGTH;
 
-	ret = sev_read_init_ex_file();
-	if (ret)
-		return ret;
-
 	if (sev_es_tmr) {
 		/*
 		 * Do not include the encryption mask on the physical
@@ -439,7 +440,7 @@ static int __sev_platform_init_locked(int *error)
 {
 	struct psp_device *psp = psp_master;
 	struct sev_device *sev;
-	int rc, psp_ret = -1;
+	int rc = 0, psp_ret = -1;
 	int (*init_function)(int *error);
 
 	if (!psp || !psp->sev_data)
@@ -450,8 +451,15 @@ static int __sev_platform_init_locked(int *error)
 	if (sev->state == SEV_STATE_INIT)
 		return 0;
 
-	init_function = sev_init_ex_buffer ? __sev_init_ex_locked :
-			__sev_init_locked;
+	if (sev_init_ex_buffer) {
+		init_function = __sev_init_ex_locked;
+		rc = sev_read_init_ex_file();
+		if (rc)
+			return rc;
+	} else {
+		init_function = __sev_init_locked;
+	}
+
 	rc = init_function(&psp_ret);
 	if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
 		/*