Date:   Fri,  3 Dec 2021 14:46:39 +0000
In-Reply-To: <20211203144642.3460447-1-pgonda@google.com>
Message-Id: <20211203144642.3460447-3-pgonda@google.com>
Mime-Version: 1.0
References: <20211203144642.3460447-1-pgonda@google.com>
Subject: [PATCH V5 2/5] crypto: ccp - Move SEV_INIT retry for corrupted data
From:   Peter Gonda <pgonda@google.com>
To:     thomas.lendacky@amd.com
Cc:     Peter Gonda <pgonda@google.com>, Marc Orr <marcorr@google.com>,
        David Rientjes <rientjes@google.com>,
        Brijesh Singh <brijesh.singh@amd.com>,
        Joerg Roedel <jroedel@suse.de>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        John Allen <john.allen@amd.com>,
        "David S. Miller" <davem@davemloft.net>,
        Paolo Bonzini <pbonzini@redhat.com>,
        linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Move the data corrupted retry of SEV_INIT into the
__sev_platform_init_locked() function. This is for upcoming INIT_EX
support as well as helping direct callers of
__sev_platform_init_locked() which currently do not support the
retry.

Signed-off-by: Peter Gonda <pgonda@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Rientjes <rientjes@google.com>
Cc: John Allen <john.allen@amd.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
 drivers/crypto/ccp/sev-dev.c | 30 ++++++++++++++++--------------
 1 file changed, 16 insertions(+), 14 deletions(-)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index f527e5f9ed1f..ef7e8b4c6e02 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -241,7 +241,7 @@ static int __sev_platform_init_locked(int *error)
 	struct psp_device *psp = psp_master;
 	struct sev_data_init data;
 	struct sev_device *sev;
-	int rc = 0;
+	int psp_ret, rc = 0;
 
 	if (!psp || !psp->sev_data)
 		return -ENODEV;
@@ -266,7 +266,21 @@ static int __sev_platform_init_locked(int *error)
 		data.tmr_len = SEV_ES_TMR_SIZE;
 	}
 
-	rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, error);
+	rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, &psp_ret);
+	if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) {
+		/*
+		 * Initialization command returned an integrity check failure
+		 * status code, meaning that firmware load and validation of SEV
+		 * related persistent data has failed. Retrying the
+		 * initialization function should succeed by replacing the state
+		 * with a reset state.
+		 */
+		dev_dbg(sev->dev, "SEV: retrying INIT command");
+		rc = __sev_do_cmd_locked(SEV_CMD_INIT, &data, &psp_ret);
+	}
+	if (error)
+		*error = psp_ret;
+
 	if (rc)
 		return rc;
 
@@ -1091,18 +1105,6 @@ void sev_pci_init(void)
 
 	/* Initialize the platform */
 	rc = sev_platform_init(&error);
-	if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) {
-		/*
-		 * INIT command returned an integrity check failure
-		 * status code, meaning that firmware load and
-		 * validation of SEV related persistent data has
-		 * failed and persistent state has been erased.
-		 * Retrying INIT command here should succeed.
-		 */
-		dev_dbg(sev->dev, "SEV: retrying INIT command");
-		rc = sev_platform_init(&error);
-	}
-
 	if (rc) {
 		dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
 			error, rc);
-- 
2.34.0.384.gca35af8252-goog