The SEV_PDH_GEN command is used to re-generate the Platform
Diffie-Hellman (PDH) key. The command is defined in SEV spec section
5.9.
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Radim Krčmář" <rkrcmar@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Gary Hook <gary.hook@xxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
drivers/crypto/ccp/psp-dev.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 03d7bd03ad58..28efb7a9245a 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -271,6 +271,34 @@ static int sev_ioctl_pek_gen(struct sev_issue_cmd *argp)
return ret;
}
+static int sev_ioctl_pdh_gen(struct sev_issue_cmd *argp)
+{
+ int ret, state, do_shutdown = 0;
+
+ /*
+ * PDH_GEN command can be issued when platform is in INIT or WORKING
+ * state. If we are in UNINIT state then transition in INIT state
+ * before issuing the command.
+ */
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ return ret;
+
+ if (state == SEV_STATE_UNINIT) {
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ return ret;
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PDH_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;
@@ -300,6 +328,10 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
ret = sev_ioctl_pek_gen(&input);
break;
}
+ case SEV_PDH_GEN: {
+ ret = sev_ioctl_pdh_gen(&input);
+ break;
+ }
default:
ret = -EINVAL;
break;
--
2.9.5
