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Subject[Part2 PATCH v5.1 12.5/31] crypto: ccp: Implement SEV_PEK_GEN ioctl command
Date
The SEV_PEK_GEN command is used to generate a new Platform Endorsement
Key (PEK). The command is defined in SEV spec section 5.6.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Gary Hook <gary.hook@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: linux-crypto@vger.kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
drivers/crypto/ccp/psp-dev.c | 68 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index d68303a06464..03d7bd03ad58 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -207,6 +207,70 @@ static int sev_ioctl_platform_status(struct sev_issue_cmd *argp)
return ret;
}

+static int sev_platform_get_state(int *state, int *error)
+{
+ struct sev_data_status *data;
+ int ret;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = sev_handle_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
+ if (!ret)
+ *state = data->state;
+
+ kfree(data);
+ return ret;
+}
+
+static int sev_firmware_init(int *error)
+{
+ struct sev_data_init *data;
+ int rc;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ rc = sev_handle_cmd(SEV_CMD_INIT, data, error);
+
+ kfree(data);
+ return rc;
+}
+
+static int sev_ioctl_pek_gen(struct sev_issue_cmd *argp)
+{
+ int do_shutdown = 0;
+ int ret, state;
+
+ /*
+ * PEK_GEN command can be issued only when firmware is in INIT state.
+ * If firmware is in UNINIT state then we transition it in INIT state
+ * and issue the command.
+ */
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ return ret;
+
+ if (state == SEV_STATE_WORKING) {
+ return -EBUSY;
+ } else if (state == SEV_STATE_UNINIT) {
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ return ret;
+
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PEK_GEN, 0, &argp->error);
+
+ if (do_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+
+ return ret;
+}
+
static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
@@ -232,6 +296,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
ret = sev_ioctl_platform_status(&input);
break;
}
+ case SEV_PEK_GEN: {
+ ret = sev_ioctl_pek_gen(&input);
+ break;
+ }
default:
ret = -EINVAL;
break;
--
2.9.5
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