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Message-Id: <20211012212202.3862372-1-pgonda@google.com>
Date: Tue, 12 Oct 2021 14:22:02 -0700
From: Peter Gonda <pgonda@...gle.com>
To: thomas.lendacky@....com
Cc: Peter Gonda <pgonda@...gle.com>,
Brijesh Singh <brijesh.singh@....com>,
Marc Orr <marcorr@...gle.com>, Joerg Roedel <jroedel@...e.de>,
Herbert Xu <herbert@...dor.apana.org.au>,
David Rientjes <rientjes@...gle.com>,
John Allen <john.allen@....com>,
"David S. Miller" <davem@...emloft.net>,
linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2] crypto: ccp - Consolidate sev INIT logic
Adds new helper function sev_init_if_required() for use in sev_ioctl().
The function calls __sev_platform_init_locked() if the command requires
the PSP's internal state be at least SEV_STATE_INIT. This consolidates
many checks scattered through out the ioctl delegation functions.
Signed-off-by: Peter Gonda <pgonda@...gle.com>
Cc: Tom Lendacky <thomas.lendacky@....com>
Cc: Brijesh Singh <brijesh.singh@....com>
Cc: Marc Orr <marcorr@...gle.com>
Cc: Joerg Roedel <jroedel@...e.de>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: David Rientjes <rientjes@...gle.com>
Cc: John Allen <john.allen@....com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
V2
* Move calls of sev_init_if_required() into command specific functions
to remove tedious command_id if statement.
---
drivers/crypto/ccp/sev-dev.c | 62 +++++++++++++++++-------------------
1 file changed, 30 insertions(+), 32 deletions(-)
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index e09925d86bf3..3f40cc73459c 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -384,26 +384,37 @@ static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
return ret;
}
-static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
+static int sev_init_if_required(bool writable, int *error)
{
struct sev_device *sev = psp_master->sev_data;
+
+ lockdep_assert_held(&sev_cmd_mutex);
+
+ if (sev->state != SEV_STATE_UNINIT)
+ return 0;
+
+ if (!writable)
+ return -EPERM;
+
+ return __sev_platform_init_locked(error);
+}
+
+static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
+{
int rc;
if (!writable)
return -EPERM;
- if (sev->state == SEV_STATE_UNINIT) {
- rc = __sev_platform_init_locked(&argp->error);
- if (rc)
- return rc;
- }
+ rc = sev_init_if_required(writable, &argp->error);
+ if (rc)
+ return rc;
return __sev_do_cmd_locked(cmd, NULL, &argp->error);
}
static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
{
- struct sev_device *sev = psp_master->sev_data;
struct sev_user_data_pek_csr input;
struct sev_data_pek_csr data;
void __user *input_address;
@@ -413,6 +424,10 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
if (!writable)
return -EPERM;
+ ret = sev_init_if_required(writable, &argp->error);
+ if (ret)
+ return ret;
+
if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
return -EFAULT;
@@ -435,12 +450,6 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
data.len = input.length;
cmd:
- if (sev->state == SEV_STATE_UNINIT) {
- ret = __sev_platform_init_locked(&argp->error);
- if (ret)
- goto e_free_blob;
- }
-
ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
/* If we query the CSR length, FW responded with expected data. */
@@ -586,7 +595,6 @@ static int sev_update_firmware(struct device *dev)
static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
{
- struct sev_device *sev = psp_master->sev_data;
struct sev_user_data_pek_cert_import input;
struct sev_data_pek_cert_import data;
void *pek_blob, *oca_blob;
@@ -595,6 +603,10 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
if (!writable)
return -EPERM;
+ ret = sev_init_if_required(writable, &argp->error);
+ if (ret)
+ return ret;
+
if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
return -EFAULT;
@@ -617,17 +629,10 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
data.oca_cert_address = __psp_pa(oca_blob);
data.oca_cert_len = input.oca_cert_len;
- /* If platform is not in INIT state then transition it to INIT */
- if (sev->state != SEV_STATE_INIT) {
- ret = __sev_platform_init_locked(&argp->error);
- if (ret)
- goto e_free_oca;
- }
-
ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
-e_free_oca:
kfree(oca_blob);
+
e_free_pek:
kfree(pek_blob);
return ret;
@@ -730,7 +735,6 @@ static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
{
- struct sev_device *sev = psp_master->sev_data;
struct sev_user_data_pdh_cert_export input;
void *pdh_blob = NULL, *cert_blob = NULL;
struct sev_data_pdh_cert_export data;
@@ -738,15 +742,9 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
void __user *input_pdh_cert_address;
int ret;
- /* If platform is not in INIT state then transition it to INIT. */
- if (sev->state != SEV_STATE_INIT) {
- if (!writable)
- return -EPERM;
-
- ret = __sev_platform_init_locked(&argp->error);
- if (ret)
- return ret;
- }
+ ret = sev_init_if_required(writable, &argp->error);
+ if (ret)
+ return ret;
if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
return -EFAULT;
--
2.33.0.882.g93a45727a2-goog
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