crypto: ccp: Implement SEV_PLATFORM_STATUS ioctl command

Web:        https://git.kernel.org/torvalds/c/efe1829b1a8fb7a8e69791141b8c8f6291708863
Commit:     efe1829b1a8fb7a8e69791141b8c8f6291708863
Parent:     2960f9a51556f79a1f9a70c5ed5a52476f62f1a1
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_PLATFORM_STATUS ioctl command
    
    The SEV_PLATFORM_STATUS command can be used by the platform owner to
    get the current status of the platform. The command is defined in
    SEV spec section 5.5.
    
    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]>
    Reviewed-by: Borislav Petkov <[email protected]>
    Acked-by: Gary R Hook <[email protected]>
---
 drivers/crypto/ccp/psp-dev.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index b49583a45a55..a5072b166ab8 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -274,6 +274,21 @@ static int sev_ioctl_do_reset(struct sev_issue_cmd *argp)
 	return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, 0, &argp->error);
 }
 
+static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
+{
+	struct sev_user_data_status *data = &psp_master->status_cmd_buf;
+	int ret;
+
+	ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
+	if (ret)
+		return ret;
+
+	if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
+		ret = -EFAULT;
+
+	return ret;
+}
+
 static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
 {
 	void __user *argp = (void __user *)arg;
@@ -299,6 +314,9 @@ static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
 	case SEV_FACTORY_RESET:
 		ret = sev_ioctl_do_reset(&input);
 		break;
+	case SEV_PLATFORM_STATUS:
+		ret = sev_ioctl_do_platform_status(&input);
+		break;
 	default:
 		ret = -EINVAL;
 		goto out;
--
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