linux-kernel - [PATCH] crypto: ccp: Improve sev_platform

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Date:   Sat, 31 Dec 2022 15:11:06 +0000
From:   Jarkko Sakkinen <jarkko@...fian.com>
To:     linux-crypto@...r.kernel.org,
        Brijesh Singh <brijesh.singh@....com>,
        Tom Lendacky <thomas.lendacky@....com>,
        John Allen <john.allen@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Jarkko Sakkinen <jarkko@...fian.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: ccp: Improve sev_platform_init() error messages

The following functions end up calling sev_platform_init() or
__sev_platform_init_locked():

* sev_guest_init()
* sev_ioctl_do_pek_csr
* sev_ioctl_do_pdh_export()
* sev_ioctl_do_pek_import()
* sev_ioctl_do_pek_pdh_gen()
* sev_pci_init()

However, only sev_pci_init() prints out the failed command error code, and
even there the error message does not specify, SEV which command failed.

Address this by printing out the SEV command errors inside
__sev_platform_init_locked(), and differentiate between DF_FLUSH, INIT and
INIT_EX commands.

This extra information is particularly useful if firmware loading and/or
initialization is going to be made more robust, e.g. by allowing
firmware loading to be postponed.

Signed-off-by: Jarkko Sakkinen <jarkko@...fian.com>
---
 drivers/crypto/ccp/sev-dev.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index 5350eacaba3a..ac7385c12091 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -963,6 +963,7 @@ static int __sev_init_ex_locked(int *error)
 
 static int __sev_platform_init_locked(int *error)
 {
+	const char *cmd = sev_init_ex_buffer ? "SEV_CMD_INIT_EX" : "SEV_CMD_INIT";
 	struct psp_device *psp = psp_master;
 	struct sev_device *sev;
 	int rc = 0, psp_ret = -1;
@@ -1008,18 +1009,23 @@ static int __sev_platform_init_locked(int *error)
 	if (error)
 		*error = psp_ret;
 
-	if (rc)
+	if (rc) {
+		dev_err(sev->dev, "SEV: %s failed error %#x", cmd, psp_ret);
 		return rc;
+	}
 
 	sev->state = SEV_STATE_INIT;
 
 	/* Prepare for first SEV guest launch after INIT */
 	wbinvd_on_all_cpus();
-	rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
-	if (rc)
-		return rc;
+	rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, &psp_ret);
+	if (error)
+		*error = psp_ret;
 
-	dev_dbg(sev->dev, "SEV firmware initialized\n");
+	if (rc) {
+		dev_err(sev->dev, "SEV: SEV_CMD_DF_FLUSH failed error %#x", psp_ret);
+		return rc;
+	}
 
 	dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
 		 sev->api_minor, sev->build);
@@ -2354,8 +2360,7 @@ void sev_pci_init(void)
 	/* Initialize the platform */
 	rc = sev_platform_init(&error);
 	if (rc)
-		dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n",
-			error, rc);
+		dev_err(sev->dev, "SEV: failed to INIT rc %d\n", rc);
 
 skip_legacy:
 	dev_info(sev->dev, "SEV%s API:%d.%d build:%d\n", sev->snp_initialized ?
-- 
2.38.1