crypto: ccp: Implement SEV_FACTORY_RESET ioctl command

Web:        https://git.kernel.org/torvalds/c/2960f9a51556f79a1f9a70c5ed5a52476f62f1a1
Commit:     2960f9a51556f79a1f9a70c5ed5a52476f62f1a1
Parent:     200664d5237f3f8cd2a2f9f5c5dea08502336bd1
Refname:    refs/heads/master
Author:     Brijesh Singh <[email protected]>
AuthorDate: Mon Dec 4 10:57:29 2017 -0600
Committer:  Brijesh Singh <[email protected]>
CommitDate: Mon Dec 4 10:57:29 2017 -0600

    crypto: ccp: Implement SEV_FACTORY_RESET ioctl command
    
    The SEV_FACTORY_RESET command can be used by the platform owner to
    reset the non-volatile SEV related data. The command is defined in
    SEV spec section 5.4
    
    Cc: Paolo Bonzini <[email protected]>
    Cc: "Radim Krčmář" <[email protected]>
    Cc: Borislav Petkov <[email protected]>
    Cc: Herbert Xu <[email protected]>
    Cc: Gary Hook <[email protected]>
    Cc: Tom Lendacky <[email protected]>
    Cc: [email protected]
    Cc: [email protected]
    Cc: [email protected]
    Improvements-by: Borislav Petkov <[email protected]>
    Signed-off-by: Brijesh Singh <[email protected]>
---
 drivers/crypto/ccp/psp-dev.c | 77 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 76 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 9915a6c604a3..b49583a45a55 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -232,9 +232,84 @@ static int sev_platform_shutdown(int *error)
 	return rc;
 }
 
+static int sev_get_platform_state(int *state, int *error)
+{
+	int rc;
+
+	rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
+				 &psp_master->status_cmd_buf, error);
+	if (rc)
+		return rc;
+
+	*state = psp_master->status_cmd_buf.state;
+	return rc;
+}
+
+static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
+{
+	int state, rc;
+
+	/*
+	 * The SEV spec requires that FACTORY_RESET must be issued in
+	 * UNINIT state. Before we go further lets check if any guest is
+	 * active.
+	 *
+	 * If FW is in WORKING state then deny the request otherwise issue
+	 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
+	 *
+	 */
+	rc = sev_get_platform_state(&state, &argp->error);
+	if (rc)
+		return rc;
+
+	if (state == SEV_STATE_WORKING)
+		return -EBUSY;
+
+	if (state == SEV_STATE_INIT) {
+		rc = __sev_platform_shutdown_locked(&argp->error);
+		if (rc)
+			return rc;
+	}
+
+	return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, 0, &argp->error);
+}
+
 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
 {
-	return -ENOTTY;
+	void __user *argp = (void __user *)arg;
+	struct sev_issue_cmd input;
+	int ret = -EFAULT;
+
+	if (!psp_master)
+		return -ENODEV;
+
+	if (ioctl != SEV_ISSUE_CMD)
+		return -EINVAL;
+
+	if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
+		return -EFAULT;
+
+	if (input.cmd > SEV_MAX)
+		return -EINVAL;
+
+	mutex_lock(&sev_cmd_mutex);
+
+	switch (input.cmd) {
+
+	case SEV_FACTORY_RESET:
+		ret = sev_ioctl_do_reset(&input);
+		break;
+	default:
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
+		ret = -EFAULT;
+out:
+	mutex_unlock(&sev_cmd_mutex);
+
+	return ret;
 }
 
 static const struct file_operations sev_fops = {
--
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